Academic literature on the topic 'Vortex Tube - Refrigeration System'
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Journal articles on the topic "Vortex Tube - Refrigeration System"
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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 (June 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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Sreenivasa Kumar Reddy, B., and K. Govindarajulu. "Air Cooling in Automobiles Using Vortex Tube Refrigeration System." Applied Mechanics and Materials 592-594 (July 2014): 1408–12. http://dx.doi.org/10.4028/www.scientific.net/amm.592-594.1408.
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Refrigeration plays an important role in developing countries, primarily for the preservation of food, medicine, and for air conditioning. Conventional refrigeration systems are using Freon as refrigerant. As they are the main cause for depletion of ozone layer, extensive research work is going on alternate refrigeration systems. Vortex tube is a non conventional cooling device, having no moving parts which will produce cold air and hot air from the source of compressed air without affecting the environment.
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Vivek, G. "Performance Analysis of Vortex Tube Refrigeration System by Experimental Method and Using ANN." Asian Review of Mechanical Engineering 11, no. 2 (December 15, 2022): 25–30. http://dx.doi.org/10.51983/arme-2022.11.2.3478.
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Vortex tube is a non-conventional cooling device, having no moving parts which will produce cold air and hot air from the source of compressed air without affecting the environment. When a high-pressure air is tangentially injected into vortex chamber, a strong vortex flow will be created which will split into two air streams, one hot stream at the periphery and the other cold stream at the inner core on both the ends. It can be used in the industrial applications such as spot cooling of cutting tools, heating process, refrigerators etc. It is weightless and requires less space. Also, the initial cost is low and its working expenses are less where compressed air is readily available. The present work is to analysis the performance of vortex tube by changing the mass flow rate of air at inlet and cold outlet. Vortex tube refrigeration system set up is fabricated with the help of instruments such as rotameter, pressure transmitter and RTD temperature sensors. In this experiment, a small vortex tube which is made up of stainless steel is used. The vortex tube is well insulated with a suitable insulating material. The experiment is carried out by varying the thermo-physical properties of the compressed air which is used as working fluid. By regulating the hot end control knob of vortex tube, the pressure, mass flow rate and temperature of air is measured at different points for various inlet working pressure.
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Bedare, Sitaram, Dr Ajay Chavan, Prof Bhushan karamkar, and Prof Mayuri Mhaske. "Experimental Investigation and Analyze the Effect of Varying L/D on Thermal Performance of Vortex Tube." International Journal of Innovative Research in Advanced Engineering 10, no. 06 (June 26, 2023): 403–7. http://dx.doi.org/10.26562/ijirae.2023.v1006.30.
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Traditional vapour compression systems are known to be costly and require regular maintenance due to their numerous moving parts. However, a promising alternative is the vortex tube refrigeration system, which operates without any moving components. This system functions as a miniature refrigerator by effectively dividing the compressed gas into two separate streams: one hot and one cold. In order to maximize the temperature reduction achieved by this system, a study was conducted to assess its thermal performance based on various geometric parameters. Specifically, the investigation focused on the influence of the length-to-diameter (L/D) ratio of the vortex chamber under different inlet pressure conditions. Experimental trials were conducted with different L/D ratios, and the analysis primarily focused on the extent of low temperature fraction attained. The results highlighted the significance of the L/D ratio in determining the overall performance of the vortex tube cooling system
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Li, Jun, Lei Xu, Nian Yong Zhou, Yan Long Jiang, and He Xu Wang. "Design and Research of Vortex-Tube-Ice-Storage System Used in Refuge Chamber." Applied Mechanics and Materials 741 (March 2015): 9–14. http://dx.doi.org/10.4028/www.scientific.net/amm.741.9.
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When disasters occur under coal mines, the electric power system and compressed air system would be highly vulnerable to damage, while heat load will be produced in the chamber because of victims’ metabolism and equipments’ operation, so it is crucial to control temperature in the chamber effectively. This paper presents a new type of vortex tube ice storage refrigeration technology, and the property of a vortex tube is tested and theory of the ice storage system is studied, then the ice making time and the best working state are obtained. It provides theoretical basis for ice storage refrigeration of mine rescue, and it is of important reference value for engineering design.
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Xie, Ying Bai, Kui Kui Cui, Zhi Chao Wang, and Jian Lin Liu. "CO2 Trans-Critical Two Stage Compression Refrigeration Cycle with Vortex Tube." Applied Mechanics and Materials 52-54 (March 2011): 255–60. http://dx.doi.org/10.4028/www.scientific.net/amm.52-54.255.
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The paper analyses CO2 trans-critical two stage compression refrigeration cycle with vortex tube expansion by thermodynamics method. And compare with CO2 trans-critical two stage compression refrigeration cycle with expansion value. The results show that in the calculated conditions of the paper, the performance of the cycle with vortex tube improves 2.4%~16.3% than the cycle with expansion value. The optimal discharge pressure maximizing COP of the cycle with vortex tube exists. With lower evaporating temperature or higher gas cooler exit temperature, COP of system decreases and COP improvement increases. The effect of cold fluid mass fraction on COP is not significant, but COP improvement increases more quickly with cold gas mass fraction increasing.
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Liu, Yefeng, Ying Sun, and Danping Tang. "Analysis of a CO2 Transcritical Refrigeration Cycle with a Vortex Tube Expansion." Sustainability 11, no. 7 (April 4, 2019): 2021. http://dx.doi.org/10.3390/su11072021.
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A carbon dioxide (CO2) refrigeration system in a transcritical cycle requires modifications to improve the coefficient of performance (COP) for energy saving. This modification has become more important with the system’s more and more widely used applications in heat pump water heaters, automotive air conditioning, and space heating. In this paper, a single vortex tube is proposed to replace the expansion valve of a traditional CO2 transcritical refrigeration system to reduce irreversible loss and improve the COP. The principle of the proposed system is introduced and analyzed: Its mathematical model was developed to simulate and compare the system performance to the traditional system. The results showed that the proposed system could save energy, and the vortex tube inlet temperature and discharge pressure had significant impacts on COP improvement. When the vortex tube inlet temperature was 45 °C, and the discharge pressure was 9 MPa, the COP increased 33.7%. When the isentropic efficiency or cold mass fraction of the vortex tube increased, the COP increased about 10%. When the evaporation temperature or the cooling water inlet temperature of the desuperheater decreased, the COP also could increase about 10%. The optimal discharge pressure correlation of the proposed system was established, and its influences on COP improvement are discussed.
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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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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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Pouraria, Hassan, and Warn-Gyu Park. "Numerical investigation on cooling performance of Ranque-Hilsch vortex tube." Thermal Science 18, no. 4 (2014): 1173–89. http://dx.doi.org/10.2298/tsci120610052p.
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A Ranque-Hilsch vortex tube (RHVT) is a mechanical device that separates a high pressure gas stream into low pressure hot and cold streams. In this study, four different two equation turbulence models namely the standard k-?, RNG k-?, Realizable k-? and standard k-? models were compared to identify the appropriate turbulence model for studying the energy separation effect in a RHVT. Comparison between the numerical and experimental results indicates that the standard k-? model is better than other models in predicting the energy separation phenomenon. The distributions of temperature, pressure, and components of velocity have been obtained in order to understand the flow behavior inside the tube. The effect of cold outlet diameter on temperature drop and refrigeration capacity was studied. The effect of cold mass fraction on the movement of stagnation point and refrigeration capacity has been investigated. Moreover, the feasibility of improving the cooling performance of vortex tube using the cooling system was investigated. The present numerical results revealed that using the cooling system, the net energy transfer rate from cold inner region to the hot peripheral region increases, thereby improving the cooling performance of the device.
Dissertations / Theses on the topic "Vortex Tube - Refrigeration System"
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Silva, Oseas Carlos da. "Refrigerating System By Rank-Hilsch Tubes With Supply of Compressed Air Tank to Power With PV Source." Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=13476.
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CoordenaÃÃo de AperfeÃoamento de Pessoal de NÃvel SuperiorA busca por novos sistemas de refrigeraÃÃo vem se tornando o alvo de estudo de diversos pesquisadores, com o objetivo de diminuir impactos ambientais referentes à destruiÃÃo da camada de ozÃnio e efeito estufa que trazem consigo diversos malefÃcios à vida no planeta. Sistemas de refrigeraÃÃo convencionais respondem por boa parte do consumo de energia elÃtrica de uma residÃncia ou uma empresa (de 20 ou atà 25%), e sÃo normalmente ligados durante o dia , quando a demanda à maior e as tarifas mais caras. Dispositivos de refrigeraÃÃo sÃo indispensÃveis nas atividades humanas, como conservaÃÃo de alimentos, medicamentos, etc. Sistemas fotovoltaicos sÃo fontes de energia elÃtrica confiÃveis e independentes. Por essas razÃes, atualmente, hà um aumento no uso de sistemas de refrigeraÃÃo acionados por energia solar fotovoltaica nas zonas rurais. Tubos de Ranque-Hilsch ou tubos de vÃrtice sÃo geralmente utilizados para refrigeraÃÃo local de baixo custo, onde hà a disponibilidade de ar comprimido. Nesse trabalho, um tubo de vÃrtice foi concebido, testado e otimizado para operaÃÃo em pressÃes inferiores Ãs convencionais, de modo a ser alimentado por um compressor acionado por mÃdulos fotovoltaicos, suprindo as necessidades de esfriamento em localidades desprovidas de energia elÃtrica. Nas mediÃÃes experimentais, foram obtidas temperaturas abaixo do ponto de congelamento da Ãgua por meio da combinaÃÃo de certos parÃmetros, possibilitando a esse sistema de climatizaÃÃo ser utilizado de maneira eficiente e racional em localidades remotas, podendo contribuir para a soluÃÃo da questÃo energÃtica e ambiental da sociedade.
The search for new refrigeration systems has become the target of various researchers. Their goal is to reduce the environment impacts resulting from the destruction of the ozone layer and the greenhouse effects that harm life in the planet Earth. Vapor-compression refrigeration systems represent a big fraction of the world energy consumption in houses and commercial stores (between 20 to 25%) and these systems usually run during the day, when the energy demand and the prices are higher. Refrigeration systems are necessary to todayâs human activities, such as food and medicament conservation, air conditioning, etc. Photovoltaic systems are reliable energy sources and they can operate separately from the distribution energy grid. For these reasons, there is an increase in the use of refrigeration systems powered by solar photovoltaic panels in rural areas. Ranque-Hilsch tubes or vorticity tubes are commonly used for low cost local refrigeration, where compressed air is available. In this study, a vortex tube was designed, tested, and optimized to operate at pressure levels lower than the conventional values. The purpose is to allow its operation by a compressor system powered by solar photovoltaic panels and, therefore, its installation in locations where there is no electrical grid. In the experimental measurements, temperatures below the water freezing point were reached due to the combination of a number of tube parameters. These low temperature values support the use of the vortex tube in air cooling applications in a more efficient and rational energy use, particularly in remote locations, and can contribute to the solution of the energy demand and environmental problems.
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Wang, Zheng. "Incorporation of a vortex tube in thermal systems : refrigerants screening and system integrations." Thesis, University College London (University of London), 2018. http://discovery.ucl.ac.uk/10045957/.
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The temperature separation effect (TSE) is a unique thermal phenomenon occurring in a vortex tube (VT). This creates the possibilities of incorporating a VT in various thermal systems to improve their overall system efficiency. Any improvement will be strongly dependent on the working fluid choices, VT geometric parameters, and the system configurations and operating conditions. However, there appears that no systematic approach for selecting the possible working fluid and for evaluating the performance of a VT when operating in a system is available. Therefore, this research aims at developing a systematic approach to screen possible choices of working fluids, and a system integration procedure to achieve optimal matching of the working fluid choice, the VT geometries and the operation conditions, based on using a combined thermodynamic and CFD simulation analysis. A 2-D CFD VT model, created using Ansys Fluent, is used to assess the influence of the VT boundary conditions on the TSE, and to provide detailed information on the flow velocities, temperature and shear stress distributions inside the VT, as well as the cooling/heating effect of the VT. The shape of refrigerant’s T-s diagram is initially used for grouping various refrigerants to either cooling or heating applications of VT. The fluid state at the VT nozzle exit is set as the criterion to identify the suitable VT entry regions on the T-s diagram for individual refrigerants. The thermal-physical properties including isentropic expansion exponent, J-T (Joule-Thomson) coefficient, thermal diffusivity, kinematic viscosity and density are employed to appraise the relative heating or cooling performance of individual refrigerants. One cooling and one heating system are chosen to illustrate the development and implementation of the proposed system integration procedure. In developing the procedure, a boundary line concept is introduced, which allows suitable VT entry conditions in a system be identified for cooling applications. An iteration procedure is designed to identify the best combination of the VT inlet pressure and degree of superheat for the heating applications for individual refrigerants. A guideline for re-selecting alternative refrigerants and re-dimensioning of VT for improving heating or cooling effect is presented, based on examining their thermal-physical properties under system conditions. The results show that the pressure drop in the VT plays an important role in determining the final heating effect. Key thermal-physical properties, such as thermal diffusivity and kinematic viscosity, are shown to be able to reliably assist the evaluation of the relative cooling/heating performance of different working fluids in closed VT systems. The proposed integration procedure is developed in such a way that it could be easily adapted for evaluation of different system configurations.
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Joy, Jesline. "Mitigation of Pressure Pulsations in Francis Turbine Draft Tube with a GuideVane System : A Numerical Investigation." Licentiate thesis, Luleå tekniska universitet, Strömningslära och experimentell mekanik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-83990.
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The use of renewable energy such as water and wind to produce electricity has been proven extremely effective in Sweden. The ability of these renewable resources to produce clean output energy counters the adversities caused by non-renewable resources. The use of hydraulic turbines is a good example of favoured technique for energy and power production using renewable resources. The hydro-turbines are designed to operate at best efficiency point (BEP). Varying energy demands in recent years implies on the need of flexible operation of hydraulic turbines. The issue of pressure pulsations in the draft tube of hydro-turbines, observed at lower operating conditions has been unresolved for many years. These pressure pulsations are related to the ‘rotating vortex rope’ (RVR) observed at part load operation and, affects the lifespan and performance of the hydro-turbine adversely. Several techniques have been investigated in the past to reduce the pressure pulsations in the draft tube at part load operation and enhance the flexibility of the turbine. During the present research study, a passive flow control technique was investigated numerically by implementing a guide vane system in the draft tube of the Francis-99model turbine. Guide vanes are mechanical devices that can direct the flow in a desired direction. The current study presents the possibility of reducing the pressure pulsations in the draft tube by mitigating the RVR using a guide vane system in the draft tube. At the initial stages of the research study, a reduced numerical model of the Francis model turbine was developed by only considering the draft tube domain. The motive was to develop a reduced model to perform the parametric analysis for the guide vane system in the draft tube with reduced computational time, power, and storage. The results obtained from the numerical study were found to be in good agreement with theFrancis-99 semi-model with passage domains. A parametric study was performed to achieve a guide vane system design that could mitigate RVR with minimum losses. During this study, the number of guide vanes, the chord and the span of the guide vanes were investigated. It was found that a set of three guide vane system with chord of 86% of runner radius and leading-edge span of 30% of runner radius is an ideal design that mitigates RVR above 95%.
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Chatterjee, Aritra. "Design of a Vortex Tube based Refrigeration System." Thesis, 2017. http://hdl.handle.net/2005/3272.
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Vortex tube (VT) is a mechanical device with no moving parts. The fundamental principle of Vortex Tube is that it can split an incoming fluid flow of a constant pressure and constant temperature gas stream into two separate low pressure streams, one having higher enthalpy and the other having lower enthalpy than the inlet flow. So this device essentially works as a temperature separator. On separation from the device, a warmer flow exits through a terminal which is called the “hot end” and a low temperature stream comes out from another terminal known as the “cold end”. Just with a few bar pressure of compressed air at room temperature can produce a hot stream temperature of about 150°C and a cold stream temperature of about - 40°C. This temperature separation scheme allows us to get cooling and heating effect simultaneously using the same device which makes the Vortex tube one of the popular mechanical equipment and is used in many fields of engineering. The cooling or heating effect produced by this device is largely dependent on geometric parameters of the device itself. Since no exact theoretical correlation is there between the geometric parameters and the cooling (or heating) effect produced, VT design is solely based on empirical relations. There are quite a few geometric parameters which affect the cooling effect of this device and all the empirical correlation are needed to design the optimum VT for maximum cooling/heating effect. These relations can be derived in two ways, either by numerical methods or by experimental investigations. The first part of the thesis important geometric parameter of the VT namely the ratio of the “cold end” diameter (to the “tube diameter” , which has been numerically optimized in this work to achieve maximum temperature separation.
In our efforts to design a VT based refrigeration system, optimization of the VT itself is not enough. A suitable heat exchanger (HX) which can extract the cold enthalpy from the VT also needs to be designed and cascaded with the VT to get the complete refrigeration system. The second part of the thesis is solely dedicated to the design of a suitable HX that can be used alongside a VT to produce refrigeration. The HXs design can be approached from two directions, dimensional aspect and material aspect. Rather than focusing on the dimensional aspect in this work we have concentrated of the material aspect of HX design. It is fairly obvious that the thermal conductivity (TC) of the HX material will play a crucial role on the cooling effect of the refrigeration system. Conventional metals with high TC can be used to design HXs but the downsides of using pure metals such as Copper, Iron are that they are heavy, quite expensive and highly reactive to corrosive fluids. Because of this, high TC ceramic material such as Aluminium Nitride (AlN) is quite often used to fabricate HXs and they are used for spot cooling in electronic systems. AlN has TC of 160 W/m-K which is high but not as high as of Copper or Iron. TC of AlN can be increased by mixing the right volume fraction of metal powder (such as pure Aluminium) with it to a great extent. So in a nutshell, instead of using pure AlN, if we use the particle reinforced binary composite [AlN + Al (powder)] to design a HX, we would achieve the benefits of having high TC as well as properties such as anti-corrosiveness, cost effectiveness and weight reduction.
In the above context, prediction of TC of particle reinforced composite materials containing a base material of low TC and a filler material of high TC is of utmost importance. Till now a very few analytical heat transfer models are available in the literature that can accurately predict the TC value of such composites especially when high volume fraction of filler particles is added to the base material or if more than one type of filler particles are added. So in this thesis, three analytical heat transfer models have been developed that can predict the TC of binary as well as tertiary particle reinforced composites.
The third and the final segment of the thesis deals with the performance study of a refrigeration system comprised of the optimized VT cascaded with a suitable HX made out of a particle reinforced composite material. The numerical results show how the HX effectiveness improves as the volume fraction of the filler particles in the composite increases.
The key results of the works described in the thesis are as follows:
• Through extensive numerical simulations it is shown that for = 0.5, the temperature separation in a VT is maximum.
• The heat transfer models developed to predict the thermal conductivity of binary composites, shows the trend of how thermal conductivity varies with increasing volume fraction of filler. It has been shown that initially the thermal conductivity increases linearly with a small slope, then after a critical volume fraction an abrupt increment of slope is observed due to the formation of continuous heat conduction paths within the composite. Further increase in volume fraction shows linear increment of thermal conductivity with lesser slope as before.
• The heat transfer model developed to predict the thermal conductivity of tertiary
composites is suitable for low volume fraction (< 20 %). The model shows the addition of one component into the base matrix affects the distribution of the other
component which is observed through the covariance.
• The last part of the thesis shows that compared to a pure AlN heat exchanger, a heat exchanger made of AlN + 30 % volume fraction of pure Aluminium powder, has increased heat exchanger effectiveness by more than 50 %.
Thesis outline is as follows:
• Chapter 1 is a brief introduction to Vortex Tube.
• Chapter 2 deals with the necessary literature review related to Vortex Tube as well as presently available heat transfer models that are equipped to handle composite materials to predict their TC.
• Chapter 3 elaborates numerical modeling and optimization of a critical parameter
( to achieve maximum temperature separation in a VT.
• Chapter 4 presents a stochastic heat transfer model to estimate the TC of Binary particle reinforced composites containing low volume fraction of filler particles.
• Chapter 5 describes the development of a computational heat transfer model to predict the TC of Particle Reinforced Binary Composite materials containing high volume fraction of filler element.
• Chapter 6 deals with a stochastic heat transfer model to calculate TC of Particle Reinforced Tertiary Composite materials containing low volume fractions of filler elements.
• Chapter 7 consolidates all the necessary concepts and data from previous chapters to design the final cascaded VT based refrigeration system and presents a performance study.
• The last chapter summarizes the entire work along with scope for future work.
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Zhao, Yongling. "Study of activated carbon/methanol adsorption refrigeration tube and system integration." Thesis, 2011. http://hdl.handle.net/2440/66346.
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Solid adsorption refrigeration systems are attracting much research interest because they have numerous advantages, such as using low grade thermal energy and being environment friendly. In recent decades many efforts have been put into developing various prototypes. The adsorption refrigeration tube (ART) is one such development. Through better system integration, a module consisting of a number of individually working ARTs can achieve significant refrigeration capacity, which may solve the vacuum leaking problem that besets large adsorption systems. In order to propose a feasible ART, this thesis undertakes a study of adsorptive properties of three types of activated carbon/methanol working pairs and modelling of the adsorption refrigeration cycle. In this examination of adsorptive properties, three activated carbon samples, Calgon 207C, 207EA and WS-480, were used to test and determine their pressure-temperature-concentration (P−T−x) relationship with methanol as the adsorbate. Based on the experimental data, three adsorption state equations, Langmuir equation, Freundlich equation and Dubinin-Astakov (D-A) equation, were compared in terms of their agreement with experimental data and their format impact on calculating coefficient of performance (COP) and refrigeration output (Qr), if one of the formats was used for presenting experimental data. Moreover, a sensitivity analysis was
conducted to reveal the parameters’ sensitivity to calculation of COP and Qr. It was found in this study that the D-A equation is the best state equation for presenting the adsorptive properties of the tested activated carbon/methanol working pairs in terms of the best agreement of P−T−x correlation and least sensitivities to parameters’ errors. A1-D dynamic model was established and validated experimentally, in which a local non-equilibrium treatment and dynamic boundary condition were introduced to the mathematical model. Regarding thermal non-equilibrium treatment, the temperatures of the local solid phase (activated carbon and adsorbed methanol) and local fluid phase were treated separately. Due to this non-equilibrium treatment, i.e. a two temperature treatment, convective heat transfer within the transport pores of activated carbon can be considered in the mathematical model. Moreover, a mathematically defined function was introduced to present the transient pressure process at the beginning of an adsorption process. Using this function, the temperature jump phenomenon can be well predicted by the mathematical model. After the mathematical model had been established and validated, a parametric analysis was conducted using the mathematical model. The effects of the cylindrical activated carbon column’s diameter and evaporating temperature on cycle time, COP and specific cooling power (SCP) were examined. Furthermore, a case study of cycle time optimisation was conducted. Finally, based on the parametric analysis, a practical solution using integrated groups of individual ART was proposed for home or domestic application. A preliminary
economics analysis was also conducted to evaluate the potential of this application.Thesis (M.Eng.Sc.) -- University of Adelaide, School of Mechanical Engineering, 2011
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Lee, Cheng-Chung, and 李正忠. "Study on the Titanium Tube Condenser for Refrigeration System of Purse Seiner." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/05317943638643962774.
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碩士國立高雄海洋科技大學
輪機工程研究所
99
The purse seiner is one of the fishing vessels with lots of capital and technology in fishery industries. In west Pacific Ocean, there are 205 American Purse Seiner vessels, of which 88 vessels belong to Taiwan ship-owners (34 vessels are registered in Taiwan others are convenience flag ships). It almost occupies approximately 43 percents. The annual catching of these 34 Taiwan vessels is about two hundred thousand tons, and this is the largest amount in Taiwan deep-sea fishery. The most influential effect of the fish price depends on its fresh condition which can be well tackled by refrigerating the captured fish in best freezing condition. Thus, the design of the freezing system is of paramount importance. A 1100-ton Purse Seiner vessel of the latest design was to achieve cooling approximately 220 tons of fresh cargo (skip jack) from 2°C to -17°C within 24 hours with the aid of brine. After that, the skip jacks are moved to the dry hold and are maintained at about -40°C. The designed cargo capacity were about 1485 cubic meters, and the Purse Seiner vessel can accommodate 935.55tons (ρ=0.63 T/m3 ) at full catching and transits cargo to another vessel one time per month. This article investigates the latest condenser in a refrigerating system of Purse Seiner vessels. Nowadays, the condenser uses pure titanium tubes to replace the traditional steel tubes. Though the titanium condenser has the heat transfer area much smaller than that of the steel-tube condenser, the two condensers possess almost equivalent heat transfer performance. In addition, the former has larger margin in condensing because of its greater overall heat transfer coefficient. Moreover, it is reported that the service life of titanium tube is about 20-30 years. Key words : purse seiner, brine, pre-cooling, full catching, transit cargo
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Chiu, Shao-Yu, and 邱紹育. "On the Performance Analysis of a Solar Collector of Evacuated Tube for an Adsorption Refrigeration System." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/7797d5.
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碩士國立臺灣大學
機械工程學研究所
105
In this study, we focus on investigating the performance of the solar collector of a evacuated tube in the adsorption refrigeration system. Using methanol and activated carbon as the working pair, the desorbed mass is measured under different initial pressure so that the theoretical COP is calculated. The effects of outlet temperature of the adsorber, the initial presure, and the porosity of the activated carbon are discussed. In addition, we employ the thermal resistance analysis to determine the heat transfer associated with different compoents of the adsorber. The experimental results show that when outlet temperature of the adsorber is 100°C, the maximal theoretical COP and collector efficiency can be reached. The theoretical COP and the collector efficiency increase as the outlet temperature of the adsorber increases. In contrast, once the outlet temperature of adsorber is increased to 110°C, heat loss of the evacuated tube increases and the required heating also augment. Hence, the theoretical COP and the collector efficiency would decrease or be the same value as the outlet temperature of the adsorber is 100°C. When the porosity of activated carbon is decreased to 18.1%, the maximal theoretical COP and the collector efficiency can be achieved. When the amount of activated carbon in the adsorber increases, more methanol can be adsorbed and the amount of desorbed methanol also increases. On the other hand, the effect of the porosity of activated carbon on the effective thermal conductivity of the working pair is negligible. As a result, the effect of the amount of desorbed methanol dominates the role the porosity plays in COP. We also find the theoretical COP and collector efficiency are nearly independent of the initial pressure. Increasing the initial pressure leads to a higher saturation temperature for methanol at the exit of the throttling valve with lower enthanlpy of vaporiation. Consequently, the cooling capacity would almost be constant and The effect of initial pressure is negligible.
Books on the topic "Vortex Tube - Refrigeration System"
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The 2006-2011 World Outlook for Air Conditioning-And Refrigeration-Type Central System Standard Steam and Steam Distributing Tube Finned Coils. Icon Group International, Inc., 2005.
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Parker, Philip M. The 2007-2012 World Outlook for Air Conditioning-And Refrigeration-Type Central System Standard Steam and Steam Distributing Tube Finned Coils. ICON Group International, Inc., 2006.
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The 2006-2011 World Outlook for Air Conditioning-And Refrigeration-Type Central System Standard Water Cooling and Heating and Cleanable Tube Water Finned Coils. Icon Group International, Inc., 2005.
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Parker, Philip M. The 2007-2012 World Outlook for Air Conditioning-And Refrigeration-Type Central System Standard Water Cooling and Heating and Cleanable Tube Water Finned Coils. ICON Group International, Inc., 2006.
Find full textBook chapters on the topic "Vortex Tube - Refrigeration System"
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Aravinth, B., S. Manivannan, C. Rameshkannan, M. Subramaniyan, and V. Raj Kumar. "Performance Analysis of Vortex Tube Refrigeration System by Experimental Method." In Materials, Design and Manufacturing for Sustainable Environment, 669–77. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-3053-9_51.
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Esa, Amirul Nawaf, Mohd Hazwan Yusof, Deyerbeen Sipaan Fredoline, and Muhammad Fadhli Suhaimi. "Development of Cooling Necklace System Using Vortex Tube." In Technological Advancement in Mechanical and Automotive Engineering, 971–80. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-1457-7_75.
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Rout, Ashutosh, Taraprasad Mohapatra, Sachindra Kumar Rout, and Dillip Kumar Biswal. "Numerical Investigation of a Shell and Coil Tube Heat Exchanger used in Solar Domestic Hot Water System." In Advances in Air Conditioning and Refrigeration, 195–207. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-6360-7_18.
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Penswick, L. B., D. C. Lewis, and R. W. Olan. "Development of a Linear Drive Cryocooler System Incorporating Both Stirling and Orifice Pulse Tube Refrigeration Cycles." In Advances in Cryogenic Engineering, 1879–86. Boston, MA: Springer US, 1998. http://dx.doi.org/10.1007/978-1-4757-9047-4_237.
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Jiang, Denghui, Ning Liu, Huakai Liu, and Xiao Li. "Application Analysis of Medium Temperature Solar Refrigeration System in Civil Buildings." In Advances in Transdisciplinary Engineering. IOS Press, 2021. http://dx.doi.org/10.3233/atde210288.
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The lithium bromide absorption refrigeration system with medium temperature solar collector as driving heat source was built, and the refrigeration performance of the system was tested and analyzed. The medium-temperature solar collector adopts all-glass vacuum solar collector tube with heat-conducting oil as medium, and the inside of the vacuum tube is composed of heat-conducting medium flow channel on the sunny side and aluminum silicate insulation cotton on the backlight side. Through test and analysis, the medium temperature solar collector of the system can provide stable heat source, and the maximum temperature of solar heating can reach above 150°C in sunny weather and about 80°C in cloudy days. The generator driving heat of the system is stable and efficient. The driving heat of lithium bromide absorption refrigerator is higher than 200 MJ/h, and can reach 300 MJ/h in some periods. The COP of the system can be kept above 0.6 during stable operation, but when the driving temperature of the generator is higher than 80°C, the COP of the system basically does not increase with the increase of the driving temperature.
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Agrawal, Neeraj, and Souvik Bhattacharyya. "Capillary Tube as an Expansion Device in a CO2 (R744) Transcritical Heat Pump System." In Handbook of Research on Advances and Applications in Refrigeration Systems and Technologies, 360–77. IGI Global, 2015. http://dx.doi.org/10.4018/978-1-4666-8398-3.ch009.
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Natural refrigerants which are ecologically safe and were in use extensively in the pre-CFC era are witnessing a revival of CO2 (R744). Inherently being a low critical temperature (31.2 ?C) refrigerant, the CO2 cycle based system operates in transcritical mode offers an opportunity to obtain an optimum operating condition. Capillary tubes which are extensively used in small size vapour compression systems work very differently in a CO2 transcritical heat pump system. In this chapter it is described that installation of a capillary tube having an appropriately designed length replacing an expansion valve will result in a natural adjustment of the gas cooler pressure, so that the system balance always shifts to a favourable COP direction; this is contrary to the scepticism that exists on the capability of a capillary tube to attain the optimal pressure operation. There is an optimal length of capillary tube for a given diameter at which the heat pump runs optimally.
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Nhan Phan, Thanh, and Van Hung Tran. "A Review on Convective Boiling Heat Transfer of Refrigerants in Horizontal Microfin-Tubes: A Typical Example." In Heat Exchangers. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.100024.
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Understanding the Heat transfer performance of refrigerant for convective boiling in horizontal microfin tube and smooth tube is place an importance role on the designing of evaporator, the main equipment on refrigeration system. Reviewing the general concept especially the theory of boiling in the tube, the formation of the flow pattern map, the calculating procedure for heat transfer coefficient and pressure drop during boiling process of refrigerant in microfin tube. Besides, a typical example will be presented more detail in step by step to define the heat transfer coefficient and pressure drop for one working condition to estimate the data results without doing experiments.
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Nhan Phan, Thanh. "A Review on Condensation Process of Refrigerants in Horizontal Microfin Tubes: A Typical Example." In Heat Transfer [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.105875.
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Heat transfer performance of refrigerant on the condensation process is very important in the designing of condensation equipment, especially in air conditioning and refrigeration systems. The outstanding advantages of microfin tubes are reducing the weight and size of condensers and also reducing the amount of refrigerant on the system. Reviewing the general concept of condensation and detailing the formation of flow pattern map that is also the procedure to determine heat transfer coefficient and pressure drop during condensation process of refrigerant inside the horizontal microfin tubes would be considered. Also, a typical example will be presented to illustrate a detailed procedure to calculate the value of heat transfer coefficient and pressure drop during the condensation process in horizontal microfin tubes. The data results show that microfin tube J60 with 60 number of fins inside 8.96 mm inner diameter, 0.2 mm height of fin, 40o of apex angle and 18o of helix angle, the condensation procedure of R1234ze at 35°C, heat flux of 8.62 kW/m2, and mass flux of 222 kg/m2s that could be estimated with heat transfer coefficient would be reduced from 8160.4 [W/m2 K] to 1413.8 [W/m2 K] follow with quality x changes from 0.99 to 0.01, and the maximum pressure drop of this process is 3173.8 [Pa/m].
Conference papers on the topic "Vortex Tube - Refrigeration System"
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Vivek, G., C. Ramesh Kannan, A. Daniel Das, S. Manivannan, and Shaji M. Jamal. "Performance analysis of vortex tube refrigeration system by experimental method." In THE 8TH ANNUAL INTERNATIONAL SEMINAR ON TRENDS IN SCIENCE AND SCIENCE EDUCATION (AISTSSE) 2021. AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0108234.
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Peng, Wenyi, Zhixiang Zhang, Jian Zhao, Suyun Yi, Guoqiang Sun, and Guoxiang Yu. "Performance Analysis of Vortex Tube-Ejector Absorption Refrigeration Cycle Driven by Ocean Thermal Energy." In 2022 4th Asia Energy and Electrical Engineering Symposium (AEEES). IEEE, 2022. http://dx.doi.org/10.1109/aeees54426.2022.9759753.
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Liu, Yefeng, and Ying Sun. "Study on the Performance of Carbon Dioxide Trans-Critical Refrigeration Cycle with Vortex Tube Expansion." In 2018 7th International Conference on Energy and Environmental Protection (ICEEP 2018). Paris, France: Atlantis Press, 2018. http://dx.doi.org/10.2991/iceep-18.2018.217.
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Hamdan, Mohammad O., Ahmed Alawar, Emad Elnajjar, and Waseem Siddique. "Feasibility of Vortex Tube Air-Conditioning System." In ASME/JSME 2011 8th Thermal Engineering Joint Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajtec2011-44393.
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This paper investigates the feasibility of using vortex tube as air-conditioning device. Series of experiments are conducted to evaluate the design parameters and calculate the performances of counter-flow Ranque–Hilsch vortex tube (RHVT). The study is conducted for different inlet pressures conditions, number of nozzle inlets, vortex chamber depth and thermal insulation condition. The vortex tube performance is investigated by measuring temperatures, pressures and mass flow rates for the inlet and hot/cold exits. It is found that vortex tube has very coefficient of performance which make it inadequate to compete with conventional air conditioning system.
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Anandakumar, J., and K. Palaniradja. "Performance enhancement of a modified corrugated tube in tube condenser in a refrigeration system." In 4TH INTERNATIONAL SCIENTIFIC CONFERENCE OF ENGINEERING SCIENCES AND ADVANCES TECHNOLOGIES. AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0118304.
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Khan, Shahzaib Yousuf, Usman Allauddin, Syed Muhammad Fakhir Hasani, Rashid Khan, and Muhammad Arsalan. "The Effect of Tube Curvature on Temperature Separation Efficiency of Ranque-Hilsch Vortex Tube." In International Petroleum Technology Conference. IPTC, 2022. http://dx.doi.org/10.2523/iptc-22414-ms.
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Abstract Vortex tube that splits a single compressed gas stream into two separate hot and cold streams had been successfully used for spot cooling, and refrigeration. Significant temperature gradient exists between hot and cold stream ends that could be utilized for power generation using thermo-electric generators. Distance between hot and cold ends could be vital for small inaccessible down-hole well locations which may require the use of curved vortex tubes. Efficiency of vortex tube depends on temperature difference between hot and cold ends. In this work, effects of tube curvature on temperature separation efficiency are investigated through numerical simulations. Numerical models of straight and curved vortex tubes are developed in a commercial computational fluid dynamics package Ansys-fluent®. For the curved tube, multiple curvature angles are used to analyze the effects of curvature on velocity and temperature fields inside the vortex tube. The standard κ − ε turbulence model is used to model three-dimensional turbulence. The cold stream mass fraction is varied by controlling hot exit pressure. The numerical results for 110° curved vortex tube are validated through published experimental data and are found to be in good agreement. It is found that the curvature has affirmative results on temperature separation efficiency as compared to straight tube. This is mainly due to the energy separation phenomenon governed by the multi-circulation loop extension and multiple vortex formation in curved vortex tubes. Curvature angles of 180° and 270° have similar effects on the vortex tube where the maximum ΔTc obtained is 15.7 K which is about 5.3% higher than the straight vortex tube. The temperature separation ΔThc values for curved tubes are comparable with straight tube, the maximum being 25.2 K for the 150° curved vortex tube which is about 0.8 per higher than the straight tube. The temperature separation efficiency for curved vortex tubes with curvature angles larger than 150° is found to be higher than straigt tube, the maximum value being 8.7% for the 270° curved tube. A profound investigation of the effects of curvature on energy separation phenomenon in a vortex tube had been lacking and this research attempts to fill that gap. This novel work is expected to provide insight into the energy separation mechanisms in vortex tubes and lead the way to their use in thermo-electric power generation.
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RACHELLY, CRISTINA, ISMAIL ALBAYRAK, ROBERT M. BOES, and VOLKER WEITBRECHT. "Bed-Load Diversion with a Vortex Tube System." In 38th IAHR World Congress. The International Association for Hydro-Environment Engineering and Research (IAHR), 2019. http://dx.doi.org/10.3850/38wc092019-0718.
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Kocaturk, Serdar, Yalcin Guldali, and A. Nilufer Egrican. "Experimental Investigation of the Parameters Influencing Refrigerant Migration in a Refrigeration System." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-41758.
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Refrigerant migration, which is characterized by the pressure equalization between condenser and evaporator during compressor off period, is one of the most effective cycling losses phenomena with the cause of 5–15% increasing rates in the energy consumption of a refrigeration system. In this study, an experimental facility was set up to investigate the parameters influencing refrigerant migration. A freezer cabinet with wire&tube evaporator and R600a and R134a reciprocating compressors were used. For the detailed control of various condensing parameters (condensing temperature, pressure, condensing rate in the condenser) a double-tube water-cooled condenser was designed. The condenser was constructed to allow the application of various lengths. Temperature and pressure values on various points of the system, refrigerant mass-flow rate, compressor power and consumed energy values were measured simultaneously. Condensing pressure and condensing rate in the condenser, condenser length, cycling frequency, refrigerant type used in the system, and ambient temperature were investigated as parameters influencing refrigerant migration. Refrigerant migration during the off period was blocked with a solenoid valve that is located before the inlet of the expansion device, and energy consumptions and COP values were mainly compared for the opened-valve and closed-valve conditions for each controlled experimental parameter.
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Stanescu, George, and Carlos Augusto de Oliveira Cabral. "VORTEX TUBE EQUIPPED SYSTEM FOR REDUCING EMISSIONS OF HYDROCARBONS IN UNDERGROUND STORAGE TANKS." In 24th ABCM International Congress of Mechanical Engineering. ABCM, 2017. http://dx.doi.org/10.26678/abcm.cobem2017.cob17-2694.
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Jang, Seongil, Joon Ahn, and Si Hyung Lim. "Performance of Oil Separator According to the Depth of the Outlet Tube." In ASME/JSME/KSME 2015 Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/ajkfluids2015-03408.
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Recent years have witnessed a growing concern over saving energy because of global warming issues and energy price hikes caused by increased oil prices. The need to improve energy efficiency to reduce energy consumption has been raised. Refrigeration systems are also expected to have their energy efficiency improved. A refrigeration system’s the compressor uses lubricating oil. Lubricating oil, along with refrigerant, circulates in a refrigeration system. During this process, the pressure drop increases, and the heat transfer coefficient decreases. Moreover, insufficient lubricant may incur a decrease in performance and damage to a compressor. Therefore, an oil separator is used to separate the lubricant and return it to the compressor. Since an oil separator causes an additional pressure drop, energy consumption should be decreased by increasing the oil separator’s separation efficiency and decreasing the pressure drop. The recent increase in development of large-scale buildings such as skyscrapers and large supermarkets has also increased the demand for large refrigeration machines. At the same time, refrigeration piping is becoming longer, and refrigerant must circulate up to the highest points. A high-pressure head and long piping configuration inevitably increase the quantity of lubricant left on the pipe wall, which in turn increases the loss of lubricants. The increased length and fall height for lubricants to circulate with refrigerant increase the related energy loss. In order to use a compressor in a high-head long-piping refrigeration system, the separation efficiency of the oil separator must be improved. Doing so will also reduce energy losses. Even with an improved separation efficiency, however, an increased pressure drop means additional energy losses. Thus, an oil separator with high separation efficiency and low pressure drop should be designed. So using the Numerical analysis, designed a new oil separator. A series of numerical simulation has been carried out to study peformance of a cyclone type oil separator, which is designed for the compressor of a refrigeration system. Working fluid is R22, which is a typical refrigerant, and mineral oil droplet is supplied. Depending on the outlet tube length, separation efficiency varies from 98.74 to 99.25%. Considering both of the separation efficiency, outlet tube length of the separator has been designed as 158 mm and oil separator length is 310mm.