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Journal articles on the topic 'Vapour compression system'

Author: Grafiati

Published: 4 June 2021

Last updated: 14 February 2022

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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 (June 10, 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 (June 10, 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

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 (October 1, 2011): 134–36. http://dx.doi.org/10.15373/2249555x/mar2013/42.

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4

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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5

Valchev, Slav, Nenko Nenov, and Vasil Georgiev. "Determination of coefficient of performance of mechanical vapour recompression heat pump." E3S Web of Conferences 112 (2019): 01013. http://dx.doi.org/10.1051/e3sconf/201911201013.

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Mechanical vapour recompression heat pump systems are widely used in the industry -in evaporator and distillation installations, in seawater desalination and industrial wastewater treatment plants. The estimation of the energy efficiency level of this type of system is based on values of two basic parameters: specific energy consumption for production of 1 kg clean water (condensate) and actual coefficient of performance of heat pump system. The object of study is experimental determination of value of actual coefficient of performance of mechanical vapour recompression heat pump system for wastewater treatment. A mathematical regression equation between the actual coefficient of performance μ and two significant factors – temperature of secondary water vapour tsv and compression ratio of water vapour in mechanical compressor of heat pump system σ is received. The analysis show that actual coefficient of performance μ highly depends of value of compression ratio σ and less depends of values of temperature of secondary vapour tsv. It conclude that MVR heat pump system, in order to operate with high values of the actual coefficient of performance should be working to high values of temperature of secondary vapour and low values of compression ratio of water vapour in mechanical compressor.

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6

West, A. C., and S. A. Sherif. "Optimization of multistage vapour compression systems using genetic algorithms. Part 1: Vapour compression system model." International Journal of Energy Research 25, no. 9 (2001): 803–12. http://dx.doi.org/10.1002/er.723.

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7

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 (October 11, 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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8

Okafor, Victor. "THERMODYNAMIC ANALYSIS OF COMPRESSOR INLET AIR PRECOOLING TECHNIQUES OF A GAS TURBINE PLANT OPERATIONAL IN NIGERIA ENERGY UTILITY SECTOR." International Journal of Engineering Science Technologies 4, no. 2 (April 1, 2020): 13–24. http://dx.doi.org/10.29121/ijoest.v4.i2.2020.74.

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Thermodynamic analysis of inlet air pre-cooling techniques of compressor is among the methods for the enhancement of gas turbine performance. This study compared the effect of using evaporative cooling system pre-cooling method, vapour compression refrigeration precooling and vapour absorption refrigeration precooling techniques to the gas turbine Net Power Output, Thermal efficiency, Thermal Efficiency Change factor (TEC) and Power Gain Ratio (PGR) taking into recognition the prevalent weather and climatic conditions of Nigeria and as well as optimization parameters for the reference system (i.e. without precooling techniques). The results show that at air temperature of 311K, the reference system, evaporative precooling, vapour compression refrigeration and vapour absorption refrigeration precooling methods recorded Net power Outputs of 23.143MW, 25.39MW, 31.84MW and 34.90MW respectively. The Thermal Efficiency Change factor recorded by the precooling systems at an ambient temperature of 311K is 8.68%, 37.4% and 51% respectively.

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9

Patel, Brijesh H., and Lalit S. Patel. "Experimental Investigation of Sub Cooling Effect on Simple Vapour Compression System by Domestic Refrigerator." Indian Journal of Applied Research 3, no. 3 (October 1, 2011): 130–33. http://dx.doi.org/10.15373/2249555x/mar2013/41.

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10

Mahmood, R. A., O. M. Ali, A. Al-Janabi, G. Al-Doori, and M. M. Noor. "Review of Mechanical Vapour Compression Refrigeration System Part 2: Performance Challenge." International Journal of Applied Mechanics and Engineering 26, no. 3 (August 26, 2021): 119–30. http://dx.doi.org/10.2478/ijame-2021-0039.

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Abstract Reducing energy consumption and providing high performance for a vapour compression refrigeration system are big challenges that need more attention and investigation. This paper provides an extensive review of experimental and theoretical studies to present the vapour compression refrigeration system and its modifications that can be used to improve system’s performance and reduce its energy consumption. This paper also presents the challenges that can be considered as a gab of research for the future works and investigations. Cooling capacity, refrigerant effect, energy consumption can be improved by using vapour injection technique, natural working fluid, and heat exchanger. Based on the outcome of this paper, vapour injection technique using natural refrigerant such as water can provide ultimate friendly refrigeration system. Future vision for the vapour compression refrigeration system and its new design technique using Computational Fluid Dynamic (CFD) is also considered and presented.

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11

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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12

Aly, Samir E. "Gas turbine total energy vapour compression desalination system." Energy Conversion and Management 40, no. 7 (May 1999): 729–41. http://dx.doi.org/10.1016/s0196-8904(98)00124-1.

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13

Akintunde, M. "Validation of a vapour compression refrigeration system design model." American Journal of Scientific and Industrial Research 2, no. 4 (August 2011): 504–10. http://dx.doi.org/10.5251/ajsir.2011.2.4.504.510.

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14

Alam, Ajaz, and Subodh Kumar. "Thermodynamic Analysis of Two-Stage Vapour Compression Refrigeration System." Global Sci-Tech 8, no. 3 (2016): 133. http://dx.doi.org/10.5958/2455-7110.2016.00016.1.

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15

Chesi, Andrea, Giovanni Ferrara, Lorenzo Ferrari, and Fabio Tarani. "Analysis of a solar assisted vapour compression cooling system." Renewable Energy 49 (January 2013): 48–52. http://dx.doi.org/10.1016/j.renene.2012.01.068.

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16

Kalbande, S. R., and Sneha Deshmukh. "Photovoltaic Based Vapour Compression Refrigeration System for Vaccine Preservation." Universal Journal of Engineering Science 3, no. 2 (May 2015): 17–23. http://dx.doi.org/10.13189/ujes.2015.030202.

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17

Saini, D. K., A. Baruah, and G. Sachdeva. "Vapour compression system analysis undergoing expansion in an ejector." Journal of Physics: Conference Series 1240 (July 2019): 012131. http://dx.doi.org/10.1088/1742-6596/1240/1/012131.

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18

Kumar, S. Sathish, and A. Mani. "Desalination using spray tower and vapour compression refrigeration system." International Journal of Nuclear Desalination 2, no. 1 (2006): 89. http://dx.doi.org/10.1504/ijnd.2006.009507.

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19

Chopra, Kapil, V. Sahni, and R. S. Mishra. "Thermodynamic and Sustainability Analysis of Vapour Compression Refrigeration System." Materials Focus 4, no. 5 (October 1, 2015): 392–96. http://dx.doi.org/10.1166/mat.2015.1266.

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20

Sun, Da-Wen. "Evaluation of a combined ejector-vapour-compression refrigeration system." International Journal of Energy Research 22, no. 4 (March 25, 1998): 333–42. http://dx.doi.org/10.1002/(sici)1099-114x(19980325)22:4<333::aid-er369>3.0.co;2-0.

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21

Saji Raveendran, P., and P. C. Murugan. "Energy Conservation on Vapour Compression Refrigeration System using PCM." IOP Conference Series: Materials Science and Engineering 1084, no. 1 (March 1, 2021): 012106. http://dx.doi.org/10.1088/1757-899x/1084/1/012106.

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22

Riaz, Fahid, Kah Hoe Tan, Muhammad Farooq, Muhammad Imran, and Poh Seng Lee. "Energy Analysis of a Novel Ejector-Compressor Cooling Cycle Driven by Electricity and Heat (Waste Heat or Solar Energy)." Sustainability 12, no. 19 (October 4, 2020): 8178. http://dx.doi.org/10.3390/su12198178.

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Low-grade heat is abundantly available as solar thermal energy and as industrial waste heat. Non concentrating solar collectors can provide heat with temperatures 75–100 °C. In this paper, a new system is proposed and analyzed which enhances the electrical coefficient of performance (COP) of vapour compression cycle (VCC) by incorporating low-temperature heat-driven ejectors. This novel system, ejector enhanced vapour compression refrigeration cycle (EEVCRC), significantly increases the electrical COP of the system while utilizing abundantly available low-temperature solar or waste heat (below 100 °C). This system uses two ejectors in an innovative way such that the higher-pressure ejector is used at the downstream of the electrically driven compressor to help reduce the delivery pressure for the electrical compressor. The lower pressure ejector is used to reduce the quality of wet vapour at the entrance of the evaporator. This system has been modelled in Engineering Equation Solver (EES) and its performance is theoretically compared with conventional VCC, enhanced ejector refrigeration system (EERS), and ejection-compression system (ECS). The proposed EEVCRC gives better electrical COP as compared to all the three systems. The parametric study has been conducted and it is found that the COP of the proposed system increases exponentially at lower condensation temperature and higher evaporator temperature. At 50 °C condenser temperature, the electrical COP of EEVCRC is 50% higher than conventional VCC while at 35 °C, the electrical COP of EEVCRC is 90% higher than conventional VCC. For the higher temperature heat source, and hence the higher generator temperatures, the electrical COP of EEVCRC increases linearly while there is no increase in the electrical COP for ECS. The better global COP indicates that a small solar collector will be needed if this system is driven by solar thermal energy. It is found that by using the second ejector at the upstream of the electrical compressor, the electrical COP is increased by 49.2% as compared to a single ejector system.

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23

Sun, Zhili, Qi Cui, Qingzhao Liu, Caiyun Wang, Jiamei Li, and Lijie Yang. "Energetic and economic analysis of vapour compression refrigeration systems applied in different temperature ranges." HKIE Transactions 27, no. 3 (October 30, 2020): 135–45. http://dx.doi.org/10.33430/v27n3thie-2018-0035.

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To determine the suitable vapour compression refrigeration system for different temperature ranges, this paper established thermodynamic models for a single-stage vapour compression refrigeration system with an economiser (SSRS+E), a two-stage vapour compression refrigeration system (TSRS), and a cascade vapour compression refrigeration system (CRS) and conducted an energetic and economic analysis of it. The results show that compared with TSRS, SSRS+E can save energy by 13.6% and 7.1%, in the evaporating temperatures of -20°C and -25°C, respectively. R744/R717 CRS is superior to TSRS in terms of energy consumption and refrigeration unit investment costs. Compared with TSRS, R744/R717 CRS can save energy by 14.1% and 18.8%, in the evaporating temperatures of -45°C and -50°C, respectively. Based on the energetic and economic analysis, SSRS+E is recommended for use above the evaporating temperature of -25°C. TSRS is recommended for use in the evaporating temperature range of -45°C to -25°C, and R744/R717 CRS is recommended for use below the evaporating temperature of -45°C.

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24

Kryłłowicz, Władysław, Krzysztof Kantyka, Włodzimierz Szewczyk, and Paweł Pełczyński. "Technical problems with compression units in mechanical vapour recompression systems." E3S Web of Conferences 70 (2018): 03006. http://dx.doi.org/10.1051/e3sconf/20187003006.

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The evidence gathered during works on two prototype heat recovery systems is summarised. The first installation is a low-temperature vapour recompression system, whereas the second is a high-temperature (from an industrial viewpoint) installation. Vapour-contaminated air is the working medium. The authors focused their attention on machine issues mainly. All compressors described below were designed at the Lodz University of Technology.

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25

Naik, Rudra, Linford Pinto, K. Rama Narasimha, and G. Pundarika. "Theoretical Studies on the Application of Pulsating Heat Pipe in Vapour Compression Refrigeration System." Applied Mechanics and Materials 592-594 (July 2014): 1801–6. http://dx.doi.org/10.4028/www.scientific.net/amm.592-594.1801.

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This paper proposes a simplified theoretical model of Pulsating Heat Pipe (PHP) employed in a vapour compression refrigeration system. The model developed is mainly based on well known physical equations and partially based on empirical correlation. The present theoretical investigation of PHP is focused to explore its suitability as a heat exchanger in the condenser of vapour compression refrigeration system. A parametric analysis is carried out to design the vapour compression refrigeration system with PHP as the condenser. The performance of the system is evaluated for different PHP diameters, working fluids, evaporator and condenser temperatures and evaporator and condenser lengths. The effect of super heating and sub cooling the refrigerant are also studied. The results showed an increase in performance of the system at higher evaporator and lower condenser temperatures. The best results are obtained with R-12 as the working fluid. Also there is an increase in the COP of the system due to decrease in pressure drop in the condenser.

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26

Ma, Rui, Yu Ting Wu, Chun Xu Du, Xia Chen, De Lou Zhang, and Chong Fang Ma. "Space Vibration Simulation Test of Vapour Compression Heat Pump." Applied Mechanics and Materials 829 (March 2016): 46–51. http://dx.doi.org/10.4028/www.scientific.net/amm.829.46.

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Vapour compression heat pump will have good prospects in future large-scale spacecraft thermal control technology. Its environmental reliability and safety needs to be tested on the ground before being carried with the spacecraft launch. Vibration test is used to assess the anti-vibration capability in its transport and use. It is essential to build a performance test system of vapour compression heat pump to explore its operating characteristics at a given random vibration conditions. The results shows that the vapour compression heat pump is normal operation after the vibration and the cooling performance (COP) of 3.09 is achieved. Vibration test is equipped to provide a guarantee for future success carrying. The performance of vapour compression heat pump at high and low temperature and vacuum environment will be carried out.

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27

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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28

Mahmood, Raid Ahmed, Omar M. Ali, and M. M. Noor. "Mechanical Vapour Compression Refrigeration System: Review Part 1: Environment Challenge." International Journal of Applied Mechanics and Engineering 25, no. 4 (December 1, 2020): 130–47. http://dx.doi.org/10.2478/ijame-2020-0054.

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AbstractIn Australia and others developed countries, concerns about global warming have increased, and these concerns influence the use of refrigerants as working fluids in mechanical vapour compression refrigeration systems. One of the most important aspects of refrigerant selection is to reduce its impact on the environment and the ozone layer. This paper provides a comprehensive review of various theoretical and experimental studies which have been carried out on air conditioning and refrigeration applications to investigate the effect of refrigerants on the environment. The analysis in this paper reveals that alternative refrigerants are the most suitable working fluids that can be used in refrigeration systems to meet the needs of the environment. This study also suggests that natural types of refrigerants such as water, carbon dioxide, and hydrocarbon will play a significant role in protecting the environment and providing alternative friendly refrigerants to be used in refrigeration and air conditioning systems.

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29

Darwish, M. A., M. Abdel-Jawad, and Awad El-Hadek. "The mechanically driven heat recovery system of vapour compression desalters." Heat Recovery Systems and CHP 10, no. 5-6 (January 1990): 447–56. http://dx.doi.org/10.1016/0890-4332(90)90195-p.

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30

Sarkar, Jahar. "Exergy analysis of vortex tube expansion vapour compression refrigeration system." International Journal of Exergy 13, no. 4 (2013): 431. http://dx.doi.org/10.1504/ijex.2013.058101.

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31

Yataganbaba, Alptug, Ali Kilicarslan, and Irfan Kurtbas. "Irreversibility analysis of a two-evaporator vapour compression refrigeration system." International Journal of Exergy 18, no. 3 (2015): 340. http://dx.doi.org/10.1504/ijex.2015.072895.

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32

Liu, Yefeng, and Jun Yu. "Review of vortex tube expansion in vapour compression refrigeration system." IOP Conference Series: Earth and Environmental Science 153 (May 2018): 032021. http://dx.doi.org/10.1088/1755-1315/153/3/032021.

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33

Singh, Monika, and Prashant Somvanshi. "Thermodynamic analysis of vapour compression refrigeration system using alternative refrigerants." IOSR Journal of Mechanical and Civil Engineering 11, no. 1 (2014): 81–89. http://dx.doi.org/10.9790/1684-11158189.

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34

Chembedu, Ganesh. "Combined Vapour Compression Refrigeration System with Ejector usage: A Review." IOSR Journal of Mechanical and Civil Engineering 14, no. 02 (March 2017): 81–83. http://dx.doi.org/10.9790/1684-1402038183.

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35

Hussain, Taliv, Faisal Khan, Abdul Ahad Ansari, Prakhar Chaturvedi, and Syed Mohd Yahya. "Performance improvement of vapour compression refrigeration system using Al2O3 nanofluid." IOP Conference Series: Materials Science and Engineering 377 (June 2018): 012155. http://dx.doi.org/10.1088/1757-899x/377/1/012155.

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36

Jin, Cong-zhuo, Qiao-li Chou, Dong-sheng Jiao, and Peng-cheng Shu. "Vapour Compression Flash seawater desalination system and its exergy analysis." Desalination 353 (November 2014): 75–83. http://dx.doi.org/10.1016/j.desal.2014.09.001.

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37

Vali, Shaik Sharmas, Talanki Puttaranga Setty, and Ashok Babu. "Analytical computation of thermodynamic performance parameters of actual vapour compression refrigeration system with R22, R32, R134a, R152a, R290 and R1270." MATEC Web of Conferences 144 (2018): 04009. http://dx.doi.org/10.1051/matecconf/201814404009.

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The present work focuses on analytical computation of thermodynamic performance of actual vapour compression refrigeration system by using six pure refrigerants. The refrigerants are namely R22, R32, R134a, R152a, R290 and R1270 respectively. A MATLAB code is developed to compute the thermodynamic performance parameters of actual vapour compression system such as refrigeration effect, compressor work, COP, power per ton of refrigeration, compressor discharge temperature and volumetric refrigeration capacity at condensing and evaporating temperatures of 54.4oC and 7.2oC respectively. Analytical results exhibited that COP of both R32 and R134a are 15.95% and 11.71% higher among the six investigated refrigerants. However R32 and R134a cannot be replaced directly into R22 system. This is due to their higher compressor discharge temperature and poor volumetric capacity respectively. The discharge temperature of both R1270 and R290 are lower than R22 by 20-26oC. Volumetric refrigeration capacity of R1270 (3197 kJ/m3) is very close to that of volumetric capacity of R22 (3251 kJ/m3). Both R1270 and R290 shows good miscibility with R22 mineral oil. Overall R1270 would be a suitable ecofriendly refrigerant to replace R22 from the stand point of ODP, GWP, volumetric capacity, discharge temperature and miscibility with mineral oil although its COP is lower.

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38

Noor, D. N., H. Ibrahim, and F. Basrawi. "Environmental Assessment on Hybrid Solar Air Conditioning System in Tropical Region." MATEC Web of Conferences 225 (2018): 06016. http://dx.doi.org/10.1051/matecconf/201822506016.

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Vapour compression systems are widely used in large scale of cooling application in industrial, commercial and institutional buildings. This conventional system did contribute to environmental problem; thus to overcome this issue nowadays, exploitation of solar energy for cooling purpose been studied. This paper presents a hybrid solar air conditioning system through appropriate solution for current problem of vapour compression system. However, solar air conditioning have major issue regarding an intermittence input due to unstable of daily solar radiation. Thus, introduction of thermal energy storage (TES) such as chilled water storage (CWS) foreseen to be the best solution and more economical compared to other types of storage. Through appropriate practicality in design and application, variation on solar collector area was analysed to determine optimum sizing which best suit with environmental factor. Surprisingly, the smallest collector area (150 m2) did shown highest saving on greenhouse gasses emission to environment.

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Lee, Gilbong, Chul Woo Roh, Bong Soo Choi, Eunseok Wang, Ho-Sang Ra, Junhyun Cho, Young-Jin Baik, Young-Soo Lee, Hyungki Shin, and Beomjoon Lee. "Performance estimation of membrane dehumidification based on heat exchanger analogy approaches using ε-NTU model." International Journal of Low-Carbon Technologies 15, no. 2 (January 25, 2020): 299–307. http://dx.doi.org/10.1093/ijlct/ctz071.

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Abstract Reports by the US Department of Energy in 2014 evaluated membrane heat pump technology as one of the most promising alternatives to conventional vapour compression methods. Vapour compression methods maintain an evaporator temperature lower than the dew point to deal with the latent heat load. In membrane heat pump systems, only the water vapour is transferred and there is no phase change. The migration is caused by the difference in vapour pressure before and after the membrane. A vacuum pump or blower is used to create the pressure difference. However, there is no methodology for predicting dehumidification performance of membranes when used as part of a cooling system. In this study, using the assumption that there is a similarity between heat transfer and moisture pervaporation, the performance indices of the membrane are derived using a well-known heat exchanger method, the ε-NTU models. Performance estimations are calculated for two representative system layouts: bypass and vacuum. Simple relations between design parameters are suggested, giving design guidelines for researchers.

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Verma, Abhishek, S. C. Kaushik, and S. K. Tyagi. "Thermodynamic Analysis of a Combined Single Effect Vapour Absorption System and tc-CO2 Compression Refrigeration System." HighTech and Innovation Journal 2, no. 2 (June 1, 2021): 87–98. http://dx.doi.org/10.28991/hij-2021-02-02-02.

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Transcritical CO2 refrigeration system is coupled with the single effect vapour absorption with LiBr-water as a working pair having an objective to enhance the performance of low temperature transcritical refrigeration system while using natural working pair and to reduce the electricity consumption to produce low temperature refrigeration. The high grade waste heat rejected in the gas cooler of tc-CO2 compression refrigeration system (TCRS) is utilized to run the single effect vapour absorption system (SEVAR) to enhance the energy efficiency of the system. The gas cooler in the transcritical CO2 system is having heat energy at high temperature and pressure, which is utilized to run the vapour absorption system, while the other refrigerant heat exchanger provides subcooling to further enhance the performance. The combined cycle can provide refrigeration temperature at different levels, to use it for different applications. Energetic and exergetic analysis have been done to analyze the combined system to compute the performance parameters and the irreversibilities occurring in different components to further increase the performance. The combined system is optimized for various heat rejection and refrigeration temperatures. The COP of the combined system has been enhanced by to 24.88% while the enhancement in exergetic efficiency (ηex) is observed as 10.14% respectively over tradition transcritical CO2 compression refrigeration system, with -10°C as an evaporation (TCRS cooling) temperature and exit temperature of gas cooler T4 being 40°C. Doi: 10.28991/HIJ-2021-02-02-02 Full Text: PDF

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Bolaji, B. O., and T. O. Falade. "Development of an Experimental Apparatus for Demonstrating Vapour Compression Refrigeration System." International Journal of Thermal and Environmental Engineering 4, no. 1 (June 1, 2011): 1–6. http://dx.doi.org/10.5383/ijtee.04.01.001.

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Santhana Krishnan, R., M. Arulprakasajothi, K. Logesh, N. Dilip Raja, and Mycherla Rajendra. "Analysis and Feasibilty of Nano-Lubricant in Vapour Compression Refrigeration System." Materials Today: Proceedings 5, no. 9 (2018): 20580–87. http://dx.doi.org/10.1016/j.matpr.2018.06.437.

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Jani, D. B., Manish Mishra, and P. K. Sahoo. "Exergy analysis of solid desiccant-vapour compression hybrid air conditioning system." International Journal of Exergy 20, no. 4 (2016): 517. http://dx.doi.org/10.1504/ijex.2016.078106.

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Upadhyay, Neeraj. "Analytical Study of Vapour Compression Refrigeration System Using Diffuser and Subcooling." IOSR Journal of Mechanical and Civil Engineering 11, no. 3 (2014): 92–97. http://dx.doi.org/10.9790/1684-11379297.

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Nelwan, L. O., R. P. A. Setiawan, M. Yulianto, Irfandi, M. Fachry, and D. Biksono. "Simulation on vapour compression heat pump system for rough rice drying." IOP Conference Series: Earth and Environmental Science 542 (August 7, 2020): 012042. http://dx.doi.org/10.1088/1755-1315/542/1/012042.

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Vithya, P., G. Sriram, S. Arumugam, V. Adithiya, D. Anand Raj, V. Aswin, and R. Balaji. "Performance Estimation of Vapour Compression Refrigeration System using Real Gas Model." IOP Conference Series: Materials Science and Engineering 390 (July 30, 2018): 012111. http://dx.doi.org/10.1088/1757-899x/390/1/012111.

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Zsembinszki, Gabriel, Alvaro de Gracia, Pere Moreno, Ricard Rovira, Miguel Ángel González, and Luisa F. Cabeza. "A novel numerical methodology for modelling simple vapour compression refrigeration system." Applied Thermal Engineering 115 (March 2017): 188–200. http://dx.doi.org/10.1016/j.applthermaleng.2016.12.059.

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Roy, Ranendra, and Bijan Kumar Mandal. "Thermodynamic Analysis of Modified Vapour Compression Refrigeration System Using R-134a." Energy Procedia 109 (March 2017): 227–34. http://dx.doi.org/10.1016/j.egypro.2017.03.050.

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Memet, Feiza, and Daniela Elena Mitu. "A Study Initiated because of the Global Warming from R-134a." Advanced Materials Research 837 (November 2013): 751–56. http://dx.doi.org/10.4028/www.scientific.net/amr.837.751.

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Vapour compression cycles are commonly used in household refrigerators and also in many commercial and industrial refrigeration systems. R-134a is a working fluid widespread in this kind of systems. A chlorine free refrigerant such as R-134a has a disadvantage in the sense of its relatively high Global Warming Potential (GWP), although the specific Ozone Depletion Potential (ODP) is null. International concern over the relatively high global warming potential of R-134a, and other refrigerants belonging to the same family, will lead in the near future to the stop of their production and use. For this reason, the interest in finding of an environmental more benign substitute for this refrigerant is growing. In the meantime, the alternatives for R-134a should be as thermodynamically attractive as this chemical. In this study it is theoretically assessed the opportunity of using R-600a (isobutane) in the future environment friendly vapour compression refrigeration systems. Choosing of isobutane is explained by the fact that it is a naturally occurring refrigerant. During the thermodynamic analysis, R-134a and R-600a are evaluated for a range of evaporating temperatures starting with 25°C and finishing with 0°C. There are considered three levels of the condensing temperature: 30°C, 40°C, 50°C. For these two refrigerants are compared results regarding saturated vapour pressure, Coefficient of Performance, volumetric cooling capacity, compressor discharge temperature, refrigerant mass flow rate. Also, in the scope of future improvement of systems adopting R-600a as a refrigerant, it is performed an exergy analysis, which is able to reveal the hierarchy of inefficiencies in the system. The results obtained indicate that adopting of R-600a instead of R-134a in vapour compression refrigeration systems is a decision motivated not only by environment reasons, but also by thermodynamic arguments. Values for the Coefficient of Performance when using R-600a are slightly lower than when in use is R-134a, but isobutane offers better environmental requirements like zero Ozone Depletion Potential and very low Global Warming Potential. Exergy analysis developed for R-600a as a working fluid revealed that the most inefficient is the compressor. Better exergy efficiency can be obtained for higher values of the evaporating temperature.

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Liang, Kun, Zhaohua Li, Ming Chen, and Hanying Jiang. "Comparisons between heat pipe, thermoelectric system, and vapour compression refrigeration system for electronics cooling." Applied Thermal Engineering 146 (January 2019): 260–67. http://dx.doi.org/10.1016/j.applthermaleng.2018.09.120.

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