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1

Sairamakrishna, B., T. Gopala Rao, and N. Rama Krishna. "Cop Enhancement of Vapour Compression Refrigeration System." Indian Journal of Production and Thermal Engineering 1, no. 2 (2021): 1–6. http://dx.doi.org/10.35940/ijpte.b2004.061221.

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This experimental investigation exemplifies the design and testing of diffuser at compressor inlet and nozzle at condenser outlet in vapour compression refrigeration system with the help of R134a refrigerant. The diffuser with divergence angle of 12°,14° and the nozzle with convergent angle 12°,14° are designed for same inlet and outlet diameters. Initially diffusers are tested at compressor inlet diffuser is used with inlet diameter equal to exit tube diameter of evaporator and outlet tube diameter is equal to suction tube diameter of the compressor. Diffuser helps to increases the pressure of the refrigerant before entering the compressor it will be helps to reduces the compression work and achieve higher performance of the vapour compression refrigeration system. Then nozzles are testing at condenser outlet, whereas nozzle inlet diameter equal to discharging tube diameter of condenser and outlet diameter equal to inlet diameter of expansion valve. Additional pressure drop in the nozzle helped to achieve higher performance of the vapour compression refrigeration system. The system is analyzes using the first and second laws of thermodynamics, to determine the refrigerating effect, the compressor work input, coefficient of performance (COP).
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2

B, Sairamakrishna, T. Gopala Rao, and Rama Krishna, N. "Cop Enhancement of Vapour Compression Refrigeration System." Indian Journal of Production and Thermal Engineering 1, no. 2 (2021): 1–6. http://dx.doi.org/10.35940/ijpte.b2004.06122.

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This experimental investigation exemplifies the design and testing of diffuser at compressor inlet and nozzle at condenser outlet in vapour compression refrigeration system with the help of R134a refrigerant. The diffuser with divergence angle of 12°,14° and the nozzle with convergent angle 12°,14° are designed for same inlet and outlet diameters. Initially diffusers are tested at compressor inlet diffuser is used with inlet diameter equal to exit tube diameter of evaporator and outlet tube diameter is equal to suction tube diameter of the compressor. Diffuser helps to increases the pressure of the refrigerant before entering the compressor it will be helps to reduces the compression work and achieve higher performance of the vapour compression refrigeration system. Then nozzles are testing at condenser outlet, whereas nozzle inlet diameter equal to discharging tube diameter of condenser and outlet diameter equal to inlet diameter of expansion valve. Additional pressure drop in the nozzle helped to achieve higher performance of the vapour compression refrigeration system. The system is analyzes using the first and second laws of thermodynamics, to determine the refrigerating effect, the compressor work input, coefficient of performance (COP).
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3

Sairamakrishna, B., T. Gopala Rao, and N. Rama Krishna. "Cop Enhancement of Vapour Compression Refrigeration System." Indian Journal of Production and Thermal Engineering 1, no. 2 (2021): 1–6. http://dx.doi.org/10.54105/ijpte.b2004.061221.

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This experimental investigation exemplifies the design and testing of diffuser at compressor inlet and nozzle at condenser outlet in vapour compression refrigeration system with the help of R134a refrigerant. The diffuser with divergence angle of 12°,14° and the nozzle with convergent angle 12°,14° are designed for same inlet and outlet diameters. Initially diffusers are tested at compressor inlet diffuser is used with inlet diameter equal to exit tube diameter of evaporator and outlet tube diameter is equal to suction tube diameter of the compressor. Diffuser helps to increases the pressure of the refrigerant before entering the compressor it will be helps to reduces the compression work and achieve higher performance of the vapour compression refrigeration system. Then nozzles are testing at condenser outlet, whereas nozzle inlet diameter equal to discharging tube diameter of condenser and outlet diameter equal to inlet diameter of expansion valve. Additional pressure drop in the nozzle helped to achieve higher performance of the vapour compression refrigeration system. The system is analyzes using the first and second laws of thermodynamics, to determine the refrigerating effect, the compressor work input, coefficient of performance (COP).
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4

B, Sairamakrishna, Gopala Rao T, and Rama Krishna N. "Cop Enhancement of Vapour Compression Refrigeration System." Indian Journal of Production and Thermal Engineering (IJPTE) 1, no. 2 (2021): 1–6. https://doi.org/10.54105/ijpte.B2004.061221.

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This experimental investigation exemplifies the design and testing of diffuser at compressor inlet and nozzle at condenser outlet in vapour compression refrigeration system with the help of R134a refrigerant. The diffuser with divergence angle of 12°,14° and the nozzle with convergent angle 12°,14° are designed for same inlet and outlet diameters. Initially diffusers are tested at compressor inlet diffuser is used with inlet diameter equal to exit tube diameter of evaporator and outlet tube diameter is equal to suction tube diameter of the compressor. Diffuser helps to increases the pressure of the refrigerant before entering the compressor it will be helps to reduces the compression work and achieve higher performance of the vapour compression refrigeration system. Then nozzles are testing at condenser outlet, whereas nozzle inlet diameter equal to discharging tube diameter of condenser and outlet diameter equal to inlet diameter of expansion valve. Additional pressure drop in the nozzle helped to achieve higher performance of the vapour compression refrigeration system. The system is analyzes using the first and second laws of thermodynamics, to determine the refrigerating effect, the compressor work input, coefficient of performance (COP).
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5

R.Hussain, Vali, P.Yagnasri, and Kumar Reddy S.Naresh. "PERFORMANCE ANALYSIS OF VCR SYSTEM WITH VARYING THE DIAMETERS OF HELICAL CONDENSER COIL BY USING R-134A REFRIGERANT." International Journal of Engineering Sciences & Research Technology 5, no. 2 (2016): 872–83. https://doi.org/10.5281/zenodo.46535.

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Vapor compression machine is a refrigerator in which the heat removed from the cold by evaporation of the refrigerant is given a thermal potential so that it can gravitate to a natural sink by compressing the vapor produced. Majority of the refrigerators works on the Vapor compression refrigeration system. The system consists of components like compressor, condenser, expansion valve and evaporator. The performance of the system depends on the performance of all the components of the system.   The design of condenser plays a very important role in the performance of a vapor compression refrigeration system. Effective new designs are possible through theoretical calculations, however may fail due to the reason that the uncertainties in the formulation of heat transfer from the refrigerant inside the condenser tubes to the ambient air. Hence experimental investigations are the best in terms of optimization of certain design parameters. The main objective in the present work is an attempt is made to verify the performance of existing condenser design to helical shaped condenser design and varying the length of the helical condenser coil to verifying the effect on the performance of a domestic refrigerator capacity 165lts, R-134a as refrigerant, hermetic sealed compressor. It is expected that the helical shaped condenser installation may give optimum results. Finally it is observed that by changing the conventional design to Helical shaped condenser the performance of the refrigeration system is increased.
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6

K.M.Odunfa and Lasisi A.L. "NUMERICAL SIMULATION OF THE PERFORMANCE OF A SOLAR ASSISTED VAPOUR COMPRESSION REFRIGERATION SYSTEM." Engineering and Technology Journal 06, no. 07 (2021): 949–58. https://doi.org/10.47191/etj/v6i7.01.

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R esearch has established that a considerable part of the electrical energy produced globally is been consumed by refrigerators and air - conditioning systems. I n th is area of cooling technology , research is therefore being geared towards energy reduction in t he cooling devices. In addition to this approach, alternative sources of energy such as renewable energy , like solar is also being explored in this area of refrigeration and cooling technology . Studies have also been conducted generally both experimentally and numerically to simulate the performance of Vapor Compression Refrigeration System (VCRS) under different conditions . However, experimental study is often seems to be expensive and time consuming to carry out due the function of many variables. This st udy was therefore designed to numerically simulate the performance assessment of a solar assisted VCRS. A numerical model of a solar assisted vapour compression refrigeration system was developed using standard solar energy and thermodynamics relations of the major components of solar assisted refrigerating system such as solar power system, compresso r, condenser, evaporator and an expansion valve to determine refrigeration effect, compressor work, and the C oefficient O f P erforma nce (COP) . Standard data of R134a refrigerant was utilized in the modelling. The model was then simulated on MATLAB source code with a CoolProp installed packages via python under two different simulation cases. In the first case, the evapor ating temperatu re was varied for all while the condensing temperature was kept constant and a reversed condition was investigated in the second case . The results showed that both the refrigerating effect and the COP of the system increase as the evaporating temperature in creased while the compressor work and the panel area decreased. Further, the refrigerating effect and the COP of the system w ere decreased as the condensing temperature was increased while the compressor work and the panel area remained constant. The coeff icient of performance at evaporating temperature of - 17.2 shows 2.91 giving a deviation of - 5.37% from the literature. The viability of a solar assisted vapour compression refrigeration system was established. The vapour compression refrigeration s ystem com pressor powered with solar energy will perform well when the solar panel (PV) area is large.
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7

Cheng, Zhi Wen. "Performance Analysis of a Novel Compression Refrigeration System." Applied Mechanics and Materials 721 (December 2014): 170–73. http://dx.doi.org/10.4028/www.scientific.net/amm.721.170.

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In this paper, the theoretical analysis and calculation were put forward for the novel compression refrigeration cycle, new cycle compared with conventional compression refrigeration cycle adding a jet pump and evaporator to reduce throttling losses and improve the compressor inlet pressure. The results show that COP decreases with the increase of condensing temperature, with the increase of evaporation temperature increased, and decreased with the increase of the ejector coefficient. Novel compression refrigeration cycle coefficient of performance than the conventional compression refrigeration system performance coefficient increased by 8-15%.
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8

Ali Al-Dabbas, Mohammad Awwad. "The Functioning of The Hybrid Integrated Partially Solar-Vapor-Compression Fridge." WSEAS TRANSACTIONS ON FLUID MECHANICS 16 (July 27, 2021): 141–57. http://dx.doi.org/10.37394/232013.2021.16.14.

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The main purpose of our research is to increase the utilization of solar thermal energy to supply a refrigerator with vapor compression and reduce the refrigeration power needed for cooling. Combined Hybrid Solar - the vapor- compression refrigerating unit has been built and operates under Mutah University's environment in Jordan. The systems were made up of a capillary tube, condenser, evaporator, and collector. The vapor-pressure refrigerator was incorporated with the classic water-solar system to minimize the compressor's duty and to reduce power consumption in heating the amount of water held in the pipe to be sent along the tube outside the evaporator. After that, it will be returned to the compressor, But at a lesser temperature, to minimize compressor workload and enhance cooling performance. Before the compressor was developed, a solar collector system had been created to maximize its temperature before reaching the compressor to improve C.O.P, and the difference in temperature was remarkable. The vapor-compression refrigerator unit was powered by many generators: solar collector that has been discharged, photovoltaic system, flat plate solar collector. Two groups of tests have been performed experimentally on the partial solar compression refrigerator integrated into a hybrid system. First in the vapor compression refrigerator only, and the second in the Hybrid solar compression refrigerator incorporated. Total sunlight and different temperatures, current, and voltage were measured for many months each hour of the day. The performance coefficient was determined found 2.019, 2.432 respectively. Many auxiliary instruments are utilized to measure the temperature in irradiation networks, voltage, and night-time current every hour.
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9

Ramanathan, Anand, and Prabhakaran Gunasekaran. "Simulation of absorption refrigeration system for automobile application." Thermal Science 12, no. 3 (2008): 5–13. http://dx.doi.org/10.2298/tsci0803005r.

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An automotive air-conditioning system based on absorption refrigeration cycle has been simulated. This waste heat driven vapor absorption refrigeration system is one alternate to the currently used vapour compression refrigeration system for automotive air-conditioning. Performance analysis of vapor absorption refrigeration system has been done by developing a steady-state simulation model to find the limitation of the proposed system. The water-lithium bromide pair is used as a working mixture for its favorable thermodynamic and transport properties compared to the conventional refrigerants utilized in vapor compression refrigeration applications. The pump power required for the proposed vapor absorption refrigeration system was found lesser than the power required to operate the compressor used in the conventional vapor compression refrigeration system. A possible arrangement of the absorption system for automobile application is proposed.
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10

Prof.S.P.Joshi1, Miss. Vaishnavi Mali2 &. Miss. Varsha Tayade3. "A REVIEW ON PERFORMANCE ANALYSIS OF SOLAR VAPOR ABSORPTION REFRIGERATION SYSTEM USING NANOF LUID." GLOBAL JOURNAL OF ENGINEERING SCIENCE AND RESEARCHES [NC-Rase 18] (November 22, 2018): 64–68. https://doi.org/10.5281/zenodo.1493984.

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This review paper focuses on the use of Nanofluid additive refrigerants in vapor compression refrigeration system (VCRS) because of their amazing development during Thermo Physical along with heat transfer potential to improve the coefficient of performance (COP) and reliability of refrigeration system. Ammonia absorption refrigeration has attracted attention due to its low refrigerating temperature and the absence of crystallization as well as good performance under vacuum conditions. However, its efficiency is still lower than the mechanical compression refrigeration system at present. The quality of heat and mass transfer in absorption process is vital for improving the performance of ammonia absorption refrigeration.
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11

Goyal, Kunal, R. V. Nanditta, Potteli Dharma Teja, S. Malarmannan, and G. Manikandaraja. "Analysis of vapor compression refrigeration system employing tetrafluroethane and difluroethane as refrigerants." Journal of Physics: Conference Series 2054, no. 1 (2021): 012054. http://dx.doi.org/10.1088/1742-6596/2054/1/012054.

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Abstract The axiomatic effects of ozone layer depletion have caused additional damage in the last few decades. The accretion in greenhouse gases has transformed to take cardinal steps immediately. The concoct blend of 1,1,1,2 Tetrafluroethane (R134a) and 1,1, Difluroethane (R152) a was tested in a vapour compression refrigeration system as these are non-toxic, eco-friendly, non-flammable and non-corrosive. Experimental performance analysis of vapor compression refrigeration system using R134a and blends of R152a and R134a is done for different dimensions of expansion valves. Various parameters like coefficient of performance (COP), refrigerating effect and compressor work were analyzed. Refrigeration effect and compressor work of R134a was higher than R152a. COP value was reliable for 60/40 ratio of R152a and R134a and maximum COP was achieved with the blend of 90/10 ratio in the first expansive coil. These aberrant results could be overcome by amalgamation of R134a and R152a as the discharge temperature of R152a is effectively controlled by blending.
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12

IJRAME, Journal. "EXPERIMENTAL INVESTIGATION ON PERFORMANCE ENHANCEMENT OF DOMESTIC REFRIGERATOR USING COPPER BASED NANOFLUIDS." International Journal of Research in Aeronautical and Mechanical Engineering 13, no. 1 (2025): 01–17. https://doi.org/10.5281/zenodo.14632418.

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A household refrigerator is a necessary piece of equipment for humans. Almost no house exists without a refrigerator. Air conditioning and refrigeration account for between 30 and 35 percent of total energy use. The researchers are always trying to build an energy-efficient cooling system and increase cooling capacity. Nano technological goods, methods, and applications contribute to environmental and climate conservation by conserving raw materials, energy, and water, as well as lowering greenhouse gas emissions and hazardous waste. The use of nanoparticles in small amount in vapor compression refrigeration system aided in improving system performance and reduced energy consumption. This paper presents the energy consumption & thermal performance of domestic refrigerator using CuO/POE Oil and Cu/POE oil nanofluids with 0.1%, 0.2 to 0.3% wt. concentration in hermetically sealed compressor of the system used in a residential refrigerator From the results it is found that compression works get reduced, cooling capacity & COPs of the systems get increased.
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13

Karthick, Munuswamy, Senthil Karuppiah, and Varatharajan Kanthan. "Performance investigation and exergy analysis of vapor compression refrigeration system operated using R600a refrigerant and nanoadditive compressor oil." Thermal Science 24, no. 5 Part A (2020): 2977–89. http://dx.doi.org/10.2298/tsci180527024m.

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Compression of vaporized refrigerant is the essential process of the refrigeration cycle which is performed by using a compressor. The amount of power consumed by a refrigeration system is governed by the work input given to its compressor, which also determines the COP of the system. By reducing the work input given to the compressor, the power consumption of refrigerator is reduced along with the improvement in its COP. Nowadays, nanoparticles have emerged as the new generation additives in various working fluids because of their remarkable ability to improve the heat transfer, tribological and other thermophysical properties of the base fluid. In such a vein, we propose a compressor oil based nanofluid prepared by dispersing nanoparticles into the conventional compressor oil. In the present study, four samples of nanoadditive compressor oil were prepared by dispersing the nanoparticles like Al2O3, TiO2, and ZnO into the conventional mineral oil as a lubricant. The tribological properties of this four samples were studied, out of which one sample gave a better lubrication and heat transfer properties which are considered as one of the key parameters for reducing work input to the compressor, this can result in reduced power consumption, with enhancement of COP. These results are analyzed experimentally by carrying out performance and exergy analysis in a vapor compression refrigeration system, using R600a as a refrigerant. The experimental results show that, there is an improvement of COP by 14.61% and exergy efficiency by 7.51%. Also, the efficiency defect in the major components of vapor compression refrigeration system has been reduced effectively.
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14

Kasi, Parthiban, and M. Cheralathan. "Review of cascade refrigeration systems for vaccine storage." Journal of Physics: Conference Series 2054, no. 1 (2021): 012041. http://dx.doi.org/10.1088/1742-6596/2054/1/012041.

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Abstract Various models are already developed to achieve the refrigerating effect. Each refrigeration system has its own set of benefits and drawbacks, as well as a unique application. The vapor compression refrigeration system and the sorption refrigeration system are the two most prominent refrigeration technologies that may be utilized for a variety of purposes. In the medical profession, cascade refrigeration will be established in the storage of blood banks, plasma, vaccines, bone banks, biological fluids storage, etc. Storing heat-sensitive vaccines at the right temperature is crucial yet often difficult by the availability of ultralow temperature cold storage. This paper has reviewed that the different types of cascade refrigeration systems for a better refrigerating effect on vaccine storage.
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15

Sungkar, Ali A., Firman Ikhsan, M. Afin Faisol, and Nandy Putra. "Performance of Thermoelectrics and Heat Pipes Refrigerator." Applied Mechanics and Materials 388 (August 2013): 52–57. http://dx.doi.org/10.4028/www.scientific.net/amm.388.52.

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Most of refrigerators commonly use the conventional refrigeration system known as Vapor Compression Refrigeration System becoming a big issue lately due to ozone depleting substance it uses as the refrigerant. This paper will shows step by step of an experiment with the objective of constructing a refrigeration system based on thermoelectric which is reliable and compete able with the Vapor Compression Refrigeration System. The designing of this refrigeration system shows attention to the environment that is combined with the knowledge so the environmental friendly technology can be applied. The performance of thermoelectric refrigerator was conducted under variation of input power (40W, 72W, and 120W) and operated in ambient temperature and cooling load of water 1000mL to investigate the characteristic of system, the performance, and also the COP. The COP is decrease by increasing of cooling load, QL. The best actual COP is 0.182 reached when the refrigerator operated at input power 40W. The result, it shows that decreasing of ambient temperature affects the decreasing of cabin temperature. Thermoelectric and heat pipe refrigerator cooling system can reach cabin temperature with power 120Watt (8.73A, 14V) produces temperature of compartment is 10.63°C indicates effective performance work-based thermoelectric applications.
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16

Hindratmo, Dimas Bayu, Bagiyo Condro Purnomo, Akbar Satrio Wicaksono, and Ilham Habibi. "Komparasi Kinerja AC Kendaraan dengan Menggunakan Refrigeran R-134a, dan R-290." Borobudur Engineering Review 3, no. 1 (2023): 1–11. http://dx.doi.org/10.31603/benr.8898.

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The development of vapor compression refrigeration systems currently depends on the issue of environmental problems related to ozone layer depletion (ODP) and global warming potential (GWP). In addition to environmental issues, low energy use is also in the spotlight of researchers. To solve the problem of refrigeration development, natural refrigeration, especially hydrocarbons, is the focus of attention. Hydrocarbons are refrigerants that have excellent properties to be natural refrigerants. This study aims to compare the performance of refrigerant R-134a with R-290. The research used a standard vapor compression refrigeration system with a TEV-type expansion valve. The system performance is seen through compression, refrigeration effect, and COP with variations in compressor rotational speed of 1000 rpm, 1500 rpm, and 2000 rpm. The results showed that the compression work, refrigeration effect, and coefficient of performance (COP) of R-290 had a more excellent value. R-290 produces the highest compression work at a 2000 rpm compressor speed of 33.34 kJ/kg for the refrigeration effect at 1000 rpm of 353.33 kJ/kg and COP at 1500 rpm 12.32.
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17

Vaibhav, Singh Chandel* Sohail Bux Aseem C. Tiwari. "PERFORMANCE ANALYSIS OF AIR CONDITIONING SYSTEM FOR AN AUTOMOBILE BASED ON AMMONIA -WATER VAPOUR ABSORPTION REFRIGERATION SYSTEM RUN BY EXHAUST WASTE HEAT OF DIESEL ENGINE." INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY 6, no. 5 (2017): 198–205. https://doi.org/10.5281/zenodo.573536.

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The air conditioning system of automobiles is mainly uses Vapour Compression Refrigerant System (VCRS) which absorbs and removes heat from the space to be cooled and throws out the heat to atmosphere. In vapour compression refrigerant system, the system utilizes power from engine shaft as the input power to drive the compressor of the refrigeration system, hence the engine has to produce extra work to run the compressor of the refrigerating system utilizing extra amount of fuel. This loss of power of the motor vehicle for refrigeration can be ignored by utilizing another refrigeration system i.e. a Vapour Absorption Refrigerant System (VARS). As well known the machines based on VARS required low grade energy for operation. Hence in such types of system, a physicochemical process replaces the mechanical process of the VCRS by utilizing energy in the form of heat rather than mechanical work. We used as a experimental set up installed at I.C .Lab of Agnos college of technology in RKDF University Bhopal Madhya Pradesh. In this set up take a 5 liters capacity four cylinders four stoke diesel engine coupled with rope brake dynamometer and connected with three fluid 0.8 KWh/day ammonia water vapour absorption refrigeration system and run by exhaust waste heat of diesel engine. The whole setup is very useful in actual automobile air condition system and totally environmental friendly.
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18

Marade, Rahul Balu, Ratnakant Appaso Pawar, Dnyaneshwar Hanumant Misal, and Narayan Digambar Nimbalkar. "TWO WHEELER SERVICING INSPECTION SYSTEM." JournalNX - a Multidisciplinary Peer Reviewed Journal TDCME-2k18 (May 10, 2018): 104–6. https://doi.org/10.5281/zenodo.1419888.

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https://journalnx.com/journal-article/20150732Solar energy is proved to be the ideal source for low-temperature heating application.Three known approaches that use solar energy to provide refrigeration at temperature below 0 degrees include PV operated refrigeration solar mechanical and compression refrigeration both PV operated and solar mechanical cycle relay on vapor compression refrigeration cycle where as compression refrigeration uses thermal energy as the primary input to the cycle .among this three approaches PV system is the most viable and appropriate means for small capacity portable system located in area not near conventional energy resources.
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19

Wang, Lin, Shuang Ping Duan, and Xiao Long Cui. "Performance Analysis of Solar-Assisted Refrigeration Cycle." Applied Mechanics and Materials 170-173 (May 2012): 2504–7. http://dx.doi.org/10.4028/www.scientific.net/amm.170-173.2504.

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Energy-conservation and environmental protection are keys to sustainable development of domestic economy. The solar-assisted cascade refrigeration cycle system is developed. The system consists of electricity-driven vapor compression refrigeration system and solar-driven vapor absorption refrigeration system. The vapor compression refrigeration system is connected in series with vapor absorption refrigeration system. Refrigerant and solution reservoirs are designed to store potential to keep the system operating continuously without sunlight. The results indicate that the system obtains pretty higher COP as compared with the conventional vapor compression refrigeration system. COP of the new-type vapor compression refrigeration system increases as sunlight becomes intense.
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20

Puangcharoenchai, Phupoom, Pongsakorn Kachapongkun, Phadungsak Rattanadecho, and Ratthasak Prommas. "Experimental Investigation of Performance Enhancement of a Vapor Compression Refrigeration System by Vortex Tube Cooling." International Journal of Air-Conditioning and Refrigeration 28, no. 02 (2020): 2050018. http://dx.doi.org/10.1142/s2010132520500182.

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This study aimed to analyze the difference in operation of the vapor compression refrigeration (VCR) system with vortex tube cooling. By using varied loads, experiments were conducted on the evaporator section of a vapor compression refrigeration system. In an attempt to improve the use of subcooling for the refrigeration, the effect of subcooling of refrigerant by vortex tube cooling was likewise examined. The test conditions included various loads (25%, 50%, 75% and 100%) and cold mass fractions (25%, 50% and 75%). This research described coefficient of performance (COP) as one of the significant parameters, in addition to heat rejection and refrigerating effect. The ideal efficiency appeared to be with the cold mass fraction of 25% and load of 100%, as identified by the results. Consequently, the COP could be enhanced by 5.16% along with an approximately 4.36% decline in average power use. Improved guidelines for vapor compression refrigeration systems to enhance the operation of the system are an expected benefit of this study.
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21

Dudar, Adam, Dariusz Butrymowicz, Kamil Śmierciew, and Jarosław Karwacki. "Exergy analysis of operation of two-phase ejector in compression refrigeration systems." Archives of Thermodynamics 34, no. 4 (2013): 107–22. http://dx.doi.org/10.2478/aoter-2013-0032.

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Abstract Paper deals with theoretical analysis of possible efficiency increase of compression refrigeration cycles by means of application of a twophase ejector. Application of the two phase ejector in subcritical refrigeration system as a booster compressor is discussed in the paper. Results of exergy analysis of the system operating with various working fluids for various operating conditions have been shown. Analysis showed possible exergy efficiency increase of refrigeration compression cycle.
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22

Liang, Youcai, Zhibin Yu, and Wenguang Li. "A Waste Heat-Driven Cooling System Based on Combined Organic Rankine and Vapour Compression Refrigeration Cycles." Applied Sciences 9, no. 20 (2019): 4242. http://dx.doi.org/10.3390/app9204242.

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In this paper, a heat driven cooling system that essentially integrated an organic Rankine cycle power plant with a vapour compression cycle refrigerator was investigated, aiming to provide an alternative to absorption refrigeration systems. The organic Rankine cycle (ORC) subsystem recovered energy from the exhaust gases of internal combustion engines to produce mechanical power. Through a transmission unit, the produced mechanical power was directly used to drive the compressor of the vapour compression cycle system to produce a refrigeration effect. Unlike the bulky vapour absorption cooling system, both the ORC power plant and vapour compression refrigerator could be scaled down to a few kilowatts, opening the possibility for developing a small-scale waste heat-driven cooling system that can be widely applied for waste heat recovery from large internal combustion engines of refrigerated ships, lorries, and trains. In this paper, a model was firstly established to simulate the proposed concept, on the basis of which it was optimized to identify the optimum operation condition. The results showed that the proposed concept is very promising for the development of heat-driven cooling systems for recovering waste heat from internal combustion engines’ exhaust gas.
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23

Misra, R. K. "Performance evaluation of Vapour Compression Refrigeration system using eco friendly refrigerants in primary circuit and nanofluid (Water-nano particles based) in secondary circuit." International Journal of Advance Research and Innovation 2, no. 2 (2014): 167–84. http://dx.doi.org/10.51976/ijari.221424.

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This paper describes thermal modeling of Vapor Compression Refrigeration System using R134a in primary circuit and AL2O3-Water based nanofluids in secondary circuit. The model uses information of the secondary fluids input conditions geometric characteristics of the system, size of nanoparticles and the compressor speed to predict the secondary fluids output temperatures, the operating pressures, the compressor power consumption and the system overall energy performance. Such an analysis can be conveniently useful to compare the thermal performance of different nano particles (Cu, Al2o3, Tio2 and CuO) based nano fluid as a secondary fluid in a Vapor Compression Refrigeration System. The influence of input variables on the output of the system is presented. Such a model can also be used to design various Components viz. Evaporator, Compressor, Condenser and Throttle Valve for Vapor Compression Refrigeration Systems for any desired cooling capacity. The use of nanofluids as a secondary fluid in vapour compression refrigeration systems was studied and computational simulation program was developed to solve the non linear equations of the system model. Simulation results have shown that for the same geometric characteristics of the system performance increased from 17% to 20% by application of nanofluid as a secondary fluid in VCS.
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24

sharma, Yuvraj. "EXPERIMENTAL STUDY OF DOMESTIC REFRIGERATOR BY USING EVAPORATIVE CONDENSER." INTERANTIONAL JOURNAL OF SCIENTIFIC RESEARCH IN ENGINEERING AND MANAGEMENT 08, no. 06 (2024): 1–5. http://dx.doi.org/10.55041/ijsrem35858.

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Refrigerator has become an essential commodity rather than luxury item. It is one of the home appliance ukkigg, vapour compression cycle in it process. Performance of this system becomes main issue and many researches are still ongoing to evaluate and improve efficiency of the system. This study presents effect of evaporative condenser on COP of domestic refrigerator. The purpose of this article is to compare the COP of refrigerator by using air cooled condenser and evaporative condenser of same length and same diameter. This experiment is carried out on domestic refrigerator (185 ikr4 test rig. In this study, an innovative, evaporative condenser for residential refrigerator was introduced. A yaw compression cycle incorporating the proposed evaporative condenser was tested to evaluate the cycle performance. To allow for evaporative cooling, sheets of cloth were wrapped around condenser to suck the water sprayed on it. The thermal properties at the different points of the refrigeration cycle were measured for typical operating conditions. Further to compare both the condensers some parameters like condenser outlet temperature, evaporator inlet temperature, power consumption have taken. After investigation it was found that evaporative condenser may replace the air cooled condenser from domestic refrigerator KEYWORDS: Refrigerator, Condenser, Evaporator, COP, Refrigerating Effect, Compressor.
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Yang, Juan Juan, Ke Li, and Xin Yang Cui. "Experimental Study on Miniature-Refrigeration System." Key Engineering Materials 531-532 (December 2012): 584–87. http://dx.doi.org/10.4028/www.scientific.net/kem.531-532.584.

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A prototype of miniature cooling system was developed, which mainly consists of the miniature compressor from DONG YUAN and a spiral-tube evaporator designed by ourselves. The performances of the prototype with different parameters were tested. The influence of ambient temperature, chilled water temperature on the performance of the cooling system were analyzed. The best operating conditions and the optimum amount of refrigerant were obtained. Conclusions were gotten as follows:1) With environment temperature rising, compression ratio increases, system power consumption increases and refrigerating capacity COP decreases. 2) With chilled water temperature rising, compression ratio and power consumption decrease, refrigerating capacity increases, and COP increases rapidly.3) Paper gets system performance: refrigerating capacity is 63 W, compressor power consumption is 24.5 W, COP value is 2.57. in operation condition: refrigerant amount is 40g, environment temperature is 30°C, chilled water temperature is 40 °C, chilled water mass flow is 45 kg/h.
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26

Fernández-Seara, José, Jaime Sieres, and Manuel Vázquez. "Compression–absorption cascade refrigeration system." Applied Thermal Engineering 26, no. 5-6 (2006): 502–12. http://dx.doi.org/10.1016/j.applthermaleng.2005.07.015.

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Mishra, R. S. "Optimization of Vapour Compression Refrigeration Systems using Mixing of Nanomaterials." International Journal of Advance Research and Innovation 3, no. 1 (2015): 200–205. http://dx.doi.org/10.51976/ijari.311535.

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This paper mainly deals with energy exergy analysis for finding irreversibilities in the brine cooled evaporator couped vapour compression refrigeration system using R134a ecofriendly refrigeration for reducing ozone depletion and global warming. The numerical computation was carried out using EES software on utilization of three nano particles (i.e. CuO, Al2O3 and TiO2) and it was observed that thre is a improvement in the refrigerating effect, first law efficiency and second law efficiency and reduction in the the system exergety destruction ratio.
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Shewale, Vinod, Arvind Kapse, and Vijay Sonawane. "Experimental analysis of vapour compression refrigeration system using nano lubricant with refrigerant R-134a." Thermal Science, no. 00 (2024): 86. http://dx.doi.org/10.2298/tsci231122086s.

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It has been proved that due to addition of nanoparticals to the refrigerant results in improvement in thermophysical properties and heat transfer characteristics of the primary refrigerant, which improves the coefficient of performance of the refrigeration system. In this experimental analysis of vapour compression system, the performance study has been carried out by preparing the nanolubricant. In this experimental study, three cases are considered. The compressor of the system filled with pure polyolester oil, SUNISO-3GS oil and polyolester oil + titanium dioxide nanoparticles as lubricant. In the nanolubricant, the volume concentration of the nanoparticles is 0.2 %. The experimental study shows that vapour compression refrigeration system works smoothly with nanorefrigerant. In this experimental study, it has observed that when nanolubricant used in place of traditional Polyol ester oil, the refrigerating effect has been increased and the compressor power consumption has reduced by 27% and the refrigeration system coefficient of performance improves by 29%. The analysis shows that the enhancement factor in the evaporator is 1.2 when nanorefrigerants are used instead of pure refrigerant. The properties of refrigerant like thermal conductivity and density are also studied for the nanolubricant by using the Labview software, in which the thermal conductivity & the density of R134a and nanolubricant mixture are observed higher in comparison with the R134a and pure lubricant mixture.
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Kalambate, Saurabh P., Rajaram N. Gawade, Shailesh B. Khandekar, Dasharath D. Jadhav, and Naveed M. H. Bhatkar. "Performance Analysis of Vapour Compression Refrigeration System by Using R134a and Blend of R290 and R600a." Journal of Advance Research in Mechanical & Civil Engineering (ISSN: 2208-2379) 2, no. 3 (2015): 76–80. http://dx.doi.org/10.53555/nnmce.v2i3.359.

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In present scenario, most of the industrial and domestic refrigerators working on vapour compression refrigeration cycle are equipped with R134a as a refrigerant. R134a is having zero ozone depletion potential, but it has high global warming potential of 1300.Hence there is need identified for alternative refrigerant to R134a. This research work is focused on performance analysis of vapour compression refrigeration system with regard to COP, refrigerating effect, compressor work for two refrigerants i.e., R134a and blend of R290 and R600a in the proportion of 60%+40% respectively as an alternative refrigerant. Performance measure like compressor discharge temperature is also considered for analysis. The results of blend of R290 and R600a are compared with halogenated hydrocarbon R134a. Trials are conducted for R134a and blend of R290 and R600a. Results showed that COP for R134a refrigerant increases with decreases in evaporator temperature and for blend of R290 and R600a it tries to remain constant. The maximum value of COP achieved for R134a and blend R290and R600a are 3.11 and 4.09 respectively.
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30

Hamad, Ahmed J. "Experimental Investigation of Vapor Compression Refrigeration System Performance Using Nano-Refrigerant." Wasit Journal of Engineering Sciences 2, no. 2 (2014): 12–27. http://dx.doi.org/10.31185/ejuow.vol2.iss2.26.

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Experimental investigation of vapor compression refrigeration system performance using Nano-refrigerant is presented in this work. Nano-refrigerant was prepared in current work by mixing 50 nanometers diameter of copper oxide CuO nanoparticles with Polyolester lubrication oil and added to the compressor of the refrigeration system to be mixed with pure refrigerant R-134a during its circulation through refrigeration system. Three concentrations (0.1%, 0.25%, and 0.4%) of CuO-R134 a Nano-refrigerant are used to study the performance of the refrigeration system test rig and to investigate the effect of using Nano-refrigerant as a working fluid compared with pure refrigerant R-134a. The results showed that, the increasing in concentration of CuO nanoparticles in the Nano-refrigerant will significantly enhance the performance of the refrigeration system, as adding nanoparticles will increase the thermal conductivity, heat transfer and improve the thermo-physical properties of Nano-refrigerant. Investigation of performance parameters for refrigeration system using Nano-refrigerant with 0.4% concentration compared with that for pure refrigerant R-134a shows that, Nano-refrigerant has reflect higher performance in range of 10% and 1.5% increase in COP and refrigeration effect respectively and 7% reduction in power consumption for refrigeration system. It can be concluded that, Nano-refrigerants can be efficiently and economically feasible to be used in the vapor compression refrigeration systems.
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Kamsuk, K., D. Damrongsak, and N. Tippayawong. "Design and Performance Analysis of a Biodiesel Engine Driven Refrigeration System for Vaccine Storage." International Journal of Renewable Energy Development 2, no. 2 (2013): 117–24. http://dx.doi.org/10.14710/ijred.2.2.117-124.

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A compact, stand-alone, refrigeration module powered by a small biodiesel engine for vaccine storage in rural use was proposed. The engine was of single cylinder, four-stroke, direct injection with displacement of 0.296 cm3 and compression ratio of 20:1. The refrigeration system was modified from an automotive vapor compression system. The system performance was analytically investigated. From the simulation, it was found to have acceptable operation over a range of speeds and loads. Performance of the system in terms of fuel consumption and torque tended to decrease with an increase in engine speed. The modular system was able to operate at cooling loads above 4.6 kW, with proper speed ratio between the engine and the compressor. Overall, primary energy ratio of the refrigeration was found to be maximum at 0.54.
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Misra, R. S. "Energy-Exergy Performance Comparison of Vapour Compression Refrigeration Systems using Three Nano Materials Mixed in R718 in the Secondry Fluid and Ecofriendly Refrigerants in the Primary Circuit and Direct Mixing of nano Materials in the Refrigerants." International Journal of Advance Research and Innovation 3, no. 3 (2015): 45–53. http://dx.doi.org/10.51976/ijari.331507.

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This paper describes thermal modelling of vapour compression refrigeration system using (ii) eco-friendly refrigerants in primary circuit with nano particles mixed with R718 in secondary evaporator circuit. This model takes care of the secondary nanoparticles mixed in the fluids as input conditions as geometric characteristics of the system such as size of nanoparticles and the compressor speed to predict the secondary fluids output temperatures, the operating pressures, the compressor power consumption and the system overall energy performance. Such design analysis is conveniently useful to compare the thermal performance of different nanoparticles (Cu, Al2O3, TiO2) based nanofluid as a secondary fluid in a vapour compression refrigeration system. The influence of input variables on the irreversibilities in terms of exergy destruction ratio of the system is presented. Such a model can also be used to design various components viz. evaporator, compressor, condenser and throttle valve for vapour compression refrigeration systems for any desired cooling capacity. This model takes care of use of nanofluids as a secondary fluid in vapour compression refrigeration systems and simulate the non-linear equations of the system. It was observed that for the same geometric characteristics of the system, first and second law performance improved from 8% to 17% by using eco-friendly refrigerants in the primary circuit and nanoparticles mixed with water as a secondary fluid in VCS .and first and second law performance improved from 8% to 32% by mixing nano particles in the eco-friendly refrigerants in the primary circuit
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Zhang, Fei Fei, Qi Tian, and Li Yuan Yin. "Operation Conditions Analysis on Solar Energy Compression-Injection Secondary Refrigeration System." Applied Mechanics and Materials 178-181 (May 2012): 139–43. http://dx.doi.org/10.4028/www.scientific.net/amm.178-181.139.

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The COP of compression-injection secondary refrigeration system is increased by 20%-50% than traditional compression-injection system. This paper analyzes the operation conditions on generation temperature, intermediate cooling temperature, condensation temperature and evaporation temperature in the compression-injection secondary refrigerating system powered by solar energy. Comprehensively considering technical and economic factors, the results show that generation temperature should be increased and condensation temperature should be decreased. In addition, the area of solar heat collector and the COP of the system should be considered when we chose the intermediate cooling temperature.
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34

Jain, Vaibhav. "A Review of Vapor Compression-Absorption Integrated Refrigeration Systems." International Journal of Advance Research and Innovation 6, no. 2 (2018): 35–43. http://dx.doi.org/10.51976/ijari.621807.

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This paper provides a literature review on vapor compression-absorption integrated refrigeration systems. A number of research options are suggested by researchers to integrate vapor compression refrigeration system (VCRS) with vapor absorption refrigeration system (VARS). Each way has its own pros and cons. Present work provides a detailed review on working, parametric study, advantages and disadvantages of various configurations of vapor compression-absorption integrated refrigeration systems.
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35

Obiora, E. Anisiji, and S. Amosun Taiwo. "Thermodynamic Investigation of the Performance of a Vapour Compression Refrigeration System Using Nano lubricant." Journal of Advances in Nanotechnology and its Applications 7, no. 2 (2025): 1–14. https://doi.org/10.5281/zenodo.15302966.

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<em>The vapour compression refrigeration (VCR) system is widely used in various industrial and domestic applications, including air conditioning, refrigeration, and heat pumping. However, the VCR system's performance is significantly affected by the properties of the lubricant used in the compressor. Conventional lubricants can lead to reduced system efficiency, increased energy consumption, and environmental concerns. This research delves into a comprehensive thermodynamic investigation of a vapor compression refrigeration system, integrating titanium-dioxide (TiO<sub>2</sub>) nanoparticles into a conventional base lubricant (mineral oil) to enhance overall system performance. The study involves a systematic examination of the refrigeration system under varying mass charges (50-70) g of R600a refrigerant. The use of reference fluid thermodynamic and transport properties database (REFPROP) was adapted in obtaining the properties needed for calculating the values of the thermodynamic parameters for the investigation. The four major components of refrigerator were instrumented at the inlet and outlet with thermocouples and pressure gauges connected to the suction and discharge of the compressor. The coefficient of performance, work of compressor, exergy efficiency, sustainability index and total irreversibility of the system were analyzed against the thermodynamic parameters. From the result obtained using 0.4g/L TiO<sub>2</sub> Nano-lubricant in the system with varying mass charge (50-70)g R600a refrigerant , it was observed that the COP of&nbsp; the system for&nbsp; 60g of R600a was 54.5% higher in comparison with 50g and 70g of R600a mass charges, the work of the compressor decreased more by 14.01% for 50g of R600a in comparison with 60 and 70g mass charges, the exergy efficiency of the system increased and highest for 70g R600a by 40% in comparison with 50 and 60g mass charges , sustainability index increased and highest for 70g R600a by 39% in comparison with 50 and 60g, the total exergy destruction of the system decreased more by 8.69% for 70g R600a in comparison with 50 and 60g mass charges.</em>
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36

Ahmad Jibril, Pandu Adi Cakranegara, Raudya Setya Wismoko Putri, and Cut Susan Octiva. "Analisis Efisiensi Kerja Kompressor Pada Mesin Refrigerasi di PT. XYZ." Jurnal Mesin Nusantara 5, no. 1 (2022): 86–95. http://dx.doi.org/10.29407/jmn.v5i1.17741.

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Refrigeration is one way to maintain the temperature of a material or a room at a lower level than the ambient temperature conditions around it by absorbing heat from the material or room. The refrigeration system that is widely used today for industrial purposes is to use a vapor compression cycle, where in this vapor compression cycle one of the components that has an important role is the compressor. Over time, the performance of the compressor will decrease, so it will affect the heat absorption process of the material to be cooled. With the reduced ability of the heat absorption process, it will reduce the efficiency level of the compressor. Based on the results of the efficiency analysis on the performance of the refrigeration system compressor at PT. XYZ, then the efficiency value is 73.98%.
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37

Gill, Jatinder, and Jagdev Singh. "Experimental Analysis of R134a/LPG as Replacement of R134a in a Vapor-Compression Refrigeration System." International Journal of Air-Conditioning and Refrigeration 25, no. 02 (2017): 1750015. http://dx.doi.org/10.1142/s2010132517500158.

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This paper presents an experimental analysis of a vapor compression refrigeration system (VCRS) using the mixture of R134a and LPG with mass fractions of 28:72 as an alternative to R134a. In this work, we compare the energy performance of both refrigerants, R134a/LPG (28:72) and R134a, in a monitored vapor compression refrigeration system under a wide range of experimental conditions. So, the System with R134a/LPG (28:72) was tested by varying the capillary tube length and refrigerant charge under experimental conditions. Performance comparisons of both the systems are made taking refrigerant R134a as baseline, and the results show that the compressor power consumption, compressor discharge temperature and pull down time obtained with R134a/LPG (28:72) of 118[Formula: see text]g and capillary tube length of 5.1 m in vapor compression refrigeration system are about 4.4% 2.4% and 5.3%, respectively, lower than that obtained with R134a in the studied range. Also, when using R134a/LPG (28:72), the system shows values of refrigeration capacity and COP are about 10.6% and 15.2% respectively, higher than those obtained using R134a, In conclusion, the mixing refrigerant R134a/LPG proposed in this study seems to be an appropriate long-term candidate to replace R134a as a new generation refrigerant of VCRS, because of its well environmentally acceptable properties and its favorable refrigeration performances.
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38

Ye, Bicui, Shufei Sun, and Zheng Wang. "Potential for Energy Utilization of Air Compression Section Using an Open Absorption Refrigeration System." Applied Sciences 12, no. 13 (2022): 6373. http://dx.doi.org/10.3390/app12136373.

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In this paper, an open absorption refrigeration system is proposed to recover part of the waste compression heat while producing cooling capacity to further cool the compressed air itself. The self-utilization of the compression waste heat can significantly reduce the energy consumption of air compression, and hence increase the energy efficiency of the cryogenic air separation unit. To illuminate the energy distribution and energy conversion principle of the open absorption refrigerator-assisted air compression section, a thermodynamic model is built and the simulation work conducted based on a practical triple-stage air compression section of a middle-scale cryogenic air separation unit. Our results indicate that the energy saving ratio is mainly constrained by the distribution of the cooling load of compressed air, which corresponds to the heat load of the generator and cooling capacity of the evaporator in the open absorption refrigerator. The energy saving ratio ranges from 0.52–8.05%, corresponding to the temperature range of 5–30 °C and humidity range of 0.002–0.010 kg/kg. It is also estimated, based on the economic analysis, that the payback period of the open absorption refrigeration system is less than one year, and the net project revenue during its life cycle reaches USD 5.7 M, thus showing an attractive economic potential.
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39

UDDIN, KUTUB, TAKAHIKO MIYAZAKI, SHIGERU KOYAMA, and BIDYUT BARAN SAHA. "PERFORMANCE INVESTIGATION OF ADSORPTION–COMPRESSION HYBRID REFRIGERATION SYSTEMS." International Journal of Air-Conditioning and Refrigeration 21, no. 04 (2013): 1350024. http://dx.doi.org/10.1142/s2010132513500247.

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An analytical investigation on the performance of adsorption–compression hybrid refrigeration systems with two different cycle configurations, cascade type and subcool type has been performed. In the former type, a cascade condenser is used which works as a condenser for mechanical compression cycle and evaporator for adsorption cycle. In the latter type, an evaporative subcooler is used which subcool the fluid of mechanical compression cycle. The refrigerants examined for the mechanical compression cycle are R134a, R152a, R1234yf and R1234ze whereas ethanol is the refrigerant for the adsorption cycle. The main feature of the proposed system is the capability to significantly reduce work input for the mechanical compressor which results up to 30% energy saving potential depending on the selection of refrigerant and system configuration. Based on the thermodynamic properties and laws the study analyzed the effect of the major design parameters such as evaporation temperature, compressor discharge pressure and desorption temperature on the system performances.
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40

Okereke, Chukwuemeka J., Idehai O. Ohijeagbon, and Olumuyiwa A. Lasode. "Energy and Exergy Analysis of Vapor Compression Refrigeration System with Flooded Evaporator." International Journal of Air-Conditioning and Refrigeration 27, no. 04 (2019): 1950041. http://dx.doi.org/10.1142/s201013251950041x.

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In this study, energy and exergy analysis was used to evaluate the performance of a vapor compression refrigeration system with a flooded evaporator and the causes of high temperatures of beverage during the production process determined. Subsequently, the components of the operation that require modification were identified in order to improve the system performance. The actual operating parameters related to energy and exergy analysis of the investigated beverage manufacturing plant were measured, the thermal properties of the beverage were determined from a calorimeter experiment, and mathematical models were developed based on the first and second laws of thermodynamics from the literature. The system energy and exergy efficiencies were 57.46% and 21.17%, respectively, whereas the system exergy destruction was 695.71[Formula: see text]kW. The highest exergy destruction among the components of the refrigeration system occurred at the cooling plate, followed by the ammonia compressor. The cooling plate also experienced a loss in the refrigerating effect of 43.59[Formula: see text]kW. Therefore, the cooling plate is the area with the highest potential for improvement. The ammonia compressor presents another potential area of improvement, which includes operating the compressor at a high compression ratio and high superheated temperature. However, the reduction of beverage inlet mass flow rate at the cooling plate offers the best opportunity to achieve a low beverage temperature between 1.00∘C and 2.00∘C and decreasing the system exergy destruction without incurring additional investment costs.
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41

Austin, N., P. M. Diaz, D. S. Manoj Abraham, and N. Kanthavelkumaran. "Environment Friendly Mixed Refrigerant to Replace R-134a in a VCR System with Exergy Analysis." Advanced Materials Research 984-985 (July 2014): 1174–79. http://dx.doi.org/10.4028/www.scientific.net/amr.984-985.1174.

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Study on environment friendly mixed refrigerant to replace R134a in vapour compression refrigeration (VCR) System. The mixed refrigerants investigated are propane (R290), butane (R600), isobutene (R600a) and R134a. Even though the ozone depletion potentials of R134a relative to CFC-11 are very low; the global warming potentials are extremely high and also expensive. For this reason, the production and use of R134a will be terminated in the near future. Hydrocarbons are free from ozone depletion potential and have negligible global warming potential. The results showed that, mixed refrigerant with charge of 80 g satisfy the required freezer air temperature when R134a with a charge of 110 g is used as refrigerant. The actual COP of refrigerator using mixed refrigerant was almost nearer that of the system using R134a as refrigerant. The coefficient of performance of the vapour compression refrigeration system using mixed refrigerant MR-3 [R134a/R290/ R600a/ R600 (20/35/40/5)] is having very close value with R134a and the Global warming potential of MR-3 is negligible when compared with R134a. Hence the mixed refrigerant MR-3 is chosen as an environmental friendly alternate refrigerant to R134a. The exergy analysis of the vapour compression refrigeration system using R134a and all the above mixtures are investigated. The effect of evaporator temperature on exergy efficiency and exergy destruction ratio of the system are experimentally studied. The exergy defect in the compressor, condenser, expansion device and evaporator are also obtained. Key words: R134a, Mixed refrigerant, Chlorofluorocarbons, Propane, Butane, Isobutene, REFPROP, COP, ODP, GWP, Exergy, VCR System.
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42

M. M. Tayde, M. M. Tayde, Pranav Datar, Pankaj kumar, and Dr L. B. Bhuyar Dr. L. B. Bhuyar. "Optimum Choice of Refrigerant for Miniature Vapour Compression Refrigeration System." Indian Journal of Applied Research 3, no. 3 (2011): 134–36. http://dx.doi.org/10.15373/2249555x/mar2013/42.

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43

Yang, Yu Fei, Wei Xing Yuan, and Yi Bin Liao. "Development of a Miniature Vapor-Compression Refrigeration System for Computer CPU Cooling." Applied Mechanics and Materials 321-324 (June 2013): 383–86. http://dx.doi.org/10.4028/www.scientific.net/amm.321-324.383.

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A miniature vapor-compression refrigeration system for cooling high power CPUs has been developed and tested. The refrigeration system is so small that it can be embedded into the computer case. The refrigerant used in the system is R-134a. The system consists of a miniature rotary DC compressor, a micro-channel condenser, a specially designed cold plate, a short tube restrictor, and related controlling electronics. The compressor is powered directly by the 12V DC power supply of the computer. The cold plate contacts the CPU surface directly and carries away the heat dissipation by conductivity. In a series of tests to cool an Intel Core i7-990X CPU that has 12 cores inside with the refrigeration system, the CPU core temperature can be kept at 23°C in default frequency 3.5GHz and 100% of workload. When the CPU is overclocked to 4.8GHz, the core temperature can be maintained at 59°C. Even when overclocked to 5.0GHz, the core temperature does not exceed 78°C. The test results validate the ability and potential of using vapor-compression refrigeration technology in high heat flux CPU cooling.
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Rajmane, Umesh C. "A Review of Vapour Compression Cascade Refrigeration System." Asian Journal of Engineering and Applied Technology 5, no. 2 (2016): 36–39. http://dx.doi.org/10.51983/ajeat-2016.5.2.801.

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Different types of refrigerant are available for cascade refrigeration technologies. this paper study provides the advantages of vapour compression cascade refrigeration system. And also summaries various techniques used in cascade refrigeration system. The operating parameters considered in this study include condensing, sub cooling, evaporating and super heating temperatures in high-temperature circuit, and temperature difference in the cascade heat exchanger, evaporating, superheating, condensing and sub cooling in the low-temperature circuit.
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45

Yang, Weibing, Zhaofeng Meng, Ziheng Huo, and Chuangchuang Ding. "Feasibility of R1234yf/R13I1 mixture refrigerant as replacement of R134A refrigerant in vapor compression system." Thermal Science 28, no. 3 Part A (2024): 2083–92. http://dx.doi.org/10.2298/tsci2403083y.

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The performance of a new mixed refrigerant R1234yf/R13I1 with a mass ratio of 90/10 under basic refrigeration cycle and refrigeration cycle with internal heat exchanger is calculated in comparison with the performance of R134a under basic refrigeration cycle at different condensation temperature and evaporation temperature. The results show that R1234yf/R13I1 is virtually non-flammable with global warming potential of less than 4. Under basic refrigeration cycle, the compressor power consumption, cooling capacity and COP of R1234yf/R13I1 are lower than these of R134a by about 4.5%, 9.5%, and 7.5%, respectively. Under refrigeration cycle with internal heat exchanger, the compressor power consumption, cooling capacity, and COP of R1234yf/R13I1 are lower than these of R134a by about 2%, 4.5%, and 3%, respectively. The R1234yf/R13I1 is a beneficial refrigerant of replacing R134a in vapor compression system.
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46

Bhatkulkar, Harish, Himanshu D. Wagh, Hemant Bansod, and Pankaj Jaiswal. "Nano Fluids used in VCRS: A Review." SAMRIDDHI : A Journal of Physical Sciences, Engineering and Technology 14, no. 01 SPL (2022): 133–37. http://dx.doi.org/10.18090/samriddhi.v14spli01.24.

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This study highlights the utilization of nano-particle fluids as the refrigerants in the conventional vapour compression based thermal systems due to their super improvement in thermo-physical properties together with heat transfer capacity to enhance performance of the system described by its COP and reliability of refrigeration system. Further, demanding situations of performance enhancement of system the usage of nano additive refrigerants had been presented. Lubricant oil is described as the important part inside the complete refrigeration system, typically for the operation characteristic of the compressor. Presently, a collection of research goes on inside the area of the nanoparticles like metals, carbon nanotubes or carbides and many more. Nano-lubricants are somewhat different form of nano-fluids that can be types of nanoparticles, lubricants are identified as typical agents in the fields of refrigeration. This paper is representing the utility of nanoparticles balanced in lubricating oils of refrigerating structures. The purpose of this research is to look at and locate what kind of lubricant oil works higher with nanoparticles in refrigeration. From the assessment of literature, it’s been found that nanoparticles blended with mineral oil offer improved performance than polyester oil.
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47

Pronin, V. A., A. V. Kovanov, V. A. Tsvetkov, E. N. Mikhailova, and P. A. Belov. "To the issue of optimising the performance of a scroll compressor as part of a CO2 booster refrigerating machine in order to increase its efficiency." Herald of Dagestan State Technical University. Technical Sciences 50, no. 1 (2023): 42–52. http://dx.doi.org/10.21822/2073-6185-2023-50-1-42-52.

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Objective. With the decreasing use of refrigerants with a high global warming potential, increasing the efficiency of refrigeration machines using natural working fluids is a very urgent task. The CO2 booster refrigerant cycle may be optimal for the fields of commercial refrigeration, climate engineering and heat pumps, but needs to be adapted to regions with hot climates. The purpose of the study is also to systematize possible ways to improve the spiral technology, as a guarantee of increasing the efficiency of booster refrigeration machines.Method. Such solutions have already been tested by increasing the transcritical cycle efficiency through the use of an ejector and parallel compression. However, the use of a scroll compressor in the transcritical cycle may be a good alternative to these methods. This solution, a little bit improves technical and economic indexes of the refrigerating machine, in the most part reducing capital and operational costs. When considering the prospect of improving the efficiency of a booster system with scroll compressor, it is necessary to address the issue of compressor performance optimisation. An issue of this kind can be referred to improving the efficiency of the booster system, at the expense of the internal characteristics of the refrigeration machine.Result. Thus, in this paper, a conceptual approach is considered to solve this problem based on a system analysis of the interconnection of the compressor as the main energy-intensive element of a refrigeration machine.Conclusion. Development of conceptual model, allows to identify influence of various factors on scroll compressor operation and to build adequate mathematical model, to choose or develop necessary calculation methods.
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48

Lavrenchenko, G. K., and B. H. Hrudka. "INCREASING THE EFFICIENCY OF THE SYSTEMS OF COMPRESSOR-PUMPING AND REFRIGERATION UNITS SUPPLYING LIQUID CO2 AND NH3 TO THE UNIT FOR CARBAMIDE SYNTHESIS." Energy Technologies & Resource Saving, no. 3 (September 20, 2021): 23–32. http://dx.doi.org/10.33070/etars.3.2021.02.

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Carbon dioxide is used in large volumes to produce urea, a highly efficient nitrogen fertilizer. It is compressed in a multistage compressor to a pressure of 15 MPa and fed to the urea synthesis unit. The specific energy consumption for the compression of carbon dioxide by a compressor reaches 0.16 kWh/kg. It may be more profitable to use in the system of compressor-pumping and refrigeration units. They can be used to liquefy carbon dioxide and compress it to pressure 15 MPa before feeding it to the synthesis of urea. In the simplest scheme, an ammonia compression refrigeration machine (ACRM) is included in the system to improve efficiency. The specific energy consumption in such a system for the liquefaction and compression of CO2 is 0.118 kWh/kg. In case of replacement of the ACRM with an absorption refrigeration machine, unit costs can be reduced to 0.09 kWh/kg. These two systems can be used to increase urea production or to ensure stable operation of the units during the summer period of their operation. The analysis showed that further improvement of the technological scheme of the entire system will completely abandon the use of the compressor method of compression of CO2 to pressure 15 MPa before its supply to the urea synthesis unit. To do this, you need to include an additional absorption lithium bromide refrigeration machine in the system. In this scheme, the compressor-pumping unit will provide the simultaneous supply of liquid carbon dioxide and ammonia for the synthesis of urea with a pressure of 15 MPa. To increase the daily production of urea from 1400 to 2000 tons, it is necessary to increase the feed liquid CO2 in the amount of 62 t/hour and liquid NH3 — 47.5 t/hour. Bibl. 14, Fig. 3.
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49

IJRAME, Journal. ""INVESTIGATION ON PERFORMANCE ENHANCEMENT OF DOMESTIC REFRIGERATOR USING NANOREFRIGERANT/NANOLUBRICANT"- A REVIEW." International Journal of Research in Aeronautical and Mechanical Engineering 11, no. 11 (2023): 14–24. https://doi.org/10.5281/zenodo.10079834.

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Domestic Refrigerator is the essential equipment for people. Nearly there is no home without refrigerator. Thermal systems like refrigerators and air conditioners consume large amount of electric power. So avenues of developing energy efficient refrigeration and air conditioning systems with nature friendly refrigerants need to be explored. The rapid advances in nanotechnology have led to emerging of new generation heat transfer fluids called Nano fluids. Nano fluids are prepared by suspending nano sized particles (1-100nm) in conventional fluids and have higher thermal conductivity than the base fluids. The researchers continuously working on increasing cooling capacity and developing a cooling system that is energy efficient. The use of nanorefrigerant in small amount in vapor compression refrigeration system aided in improving system performance. This paper focuses on extensive literature review on thermal performance of the VCRs system used in a residential refrigerator using nanorefrigerant and nanolubricant.
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Siddharth, Raju, Korody Jagannath, P. Kini Giridhar, and K. Kedlaya Vishnumurthy. "Design and Simulation of a Vapour Compression Refrigeration System Using Phase Change Material." MATEC Web of Conferences 144 (2018): 04002. http://dx.doi.org/10.1051/matecconf/201814404002.

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The paper details the design and simulation of a solar powered vapour compression refrigeration system. The effect of a phase change material, in this case ice, on a vapour compression refrigeration system powered by solar panels is discussed. The battery and solar panels were sized to allow the system to function as an autonomous unit for a minimum of 12 hours. It was concluded that the presence of a phase change material in the refrigeration system caused a considerable increase in both the on and off time of the compressor. The ratio by which the on time increased was greater than the ratio by which the off time was increased. There was a 219% increase in the on time, a 139% increase in the compressor off time and a 3.5% increase in compressor work accompanied by a 5.5% reduction in COP. Thus, under conditions where there is enough load in the system to cause the initial on and off times of the compressor to be comparable, the presence of a phase change material may result in a greater on period than an off period for the compressor.
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