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The Effect of Refrigerants in the Mixed Lubrication Regime
1997Because of environmental concerns, CFC (chlorofluorocarbon) refrigerants must be replaced with HFCs (hydrofluorocarbons.) As a result, many tribological problems are caused especially in rotary piston compressors. To solve the problem, the effects of refrigerants on friction and wear characteristics of the oil and refrigerant mixtures at the mixed ...
K Mizuhara, M Tomimoto
exaly +2 more sources
Testing of the mixing refrigerants HFC152a/HFC125 in domestic refrigerator
Applied Thermal Engineering, 2005Abstract The performances of a refrigeration cycle of a 1,1-difluoroethane/pentafluoroethane (HFC152a/HFC125) mixture used as a refrigerant for domestic refrigerators were calculated and analyzed in detail. The results of the theoretical analysis indicate that the HFC152a/HFC125 mixture in the composition of 0.85 mass fraction of HFC152a has a ...
Mao-Gang He +3 more
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International Journal of Hydrogen EnergyThe global massive rise in consumption of power and energy has led to an increased elevation of the status of hydrogen energy as a primary clean fuel for the future.
Osama Khan +2 more
exaly +2 more sources
Synthesis of Mixed Refrigerant Cascade Cycles
Chemical Engineering Communications, 2002This paper considers the synthesis of refrigeration systems with refrigerant mixtures as working fluids. The employed refrigeration topology encompasses features from industrial liquefaction of natural gas (LNG) systems. This configuration consists of a combination of horizontal and vertical cascades generalizing the vertical cascade of pure ...
Shankar Vaidyaraman, Costas D. Maranas
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Heat Transfer Engineering, 2020
As the use of semiconductors in industrial site increases, research on ultra-low refrigerators is required to increase the life and quality of the semiconductors.
Kwang-Seok Lee +6 more
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As the use of semiconductors in industrial site increases, research on ultra-low refrigerators is required to increase the life and quality of the semiconductors.
Kwang-Seok Lee +6 more
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Environmental Science and Pollution Research, 2022
This paper presents the environment-friendly mixture compositions of hydrocarbons (HC)- and hydrofluorocarbon (HFC)-based ternary mixtures that can be better alternatives for R134a in domestic refrigeration units. Combustible refrigerant HCs (R290, R600, R600a) and HFCs (R152a and R161) are used along with the dilutants R13I1, R245fa, R134a, R227ea ...
Nagarjuna, Kumma +1 more
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This paper presents the environment-friendly mixture compositions of hydrocarbons (HC)- and hydrofluorocarbon (HFC)-based ternary mixtures that can be better alternatives for R134a in domestic refrigeration units. Combustible refrigerant HCs (R290, R600, R600a) and HFCs (R152a and R161) are used along with the dilutants R13I1, R245fa, R134a, R227ea ...
Nagarjuna, Kumma +1 more
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Tri-Technology Device Refrigeration (TTDR) III, 2018
Three miniature Joule-Thomson cryogenic coolers and a testing set up were built to investigate the cooling performance in this work. Shell-and-tube heat exchanger and plate fin heat exchangers with rectangular micro channels were designed to achieve high specific surface area.
Yinong Wu, Maoqiong Gong, Gaofei Chen
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Three miniature Joule-Thomson cryogenic coolers and a testing set up were built to investigate the cooling performance in this work. Shell-and-tube heat exchanger and plate fin heat exchangers with rectangular micro channels were designed to achieve high specific surface area.
Yinong Wu, Maoqiong Gong, Gaofei Chen
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Performance of mixed refrigerant cascade refrigerator for cooling a space simulation chamber
Indian Journal of Cryogenics, 2014A mixed refrigerant cascade (MRC) refrigeration system has been developed to replace a conventional two-stage cascade refrigeration system for the cooling of space simulation chambers. A fast cool down of the refrigerator to 193K within a time of 16 min is achieved.
Bura Sreenivas +3 more
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Optimal Design of Mixed Refrigerant Cycles
Industrial & Engineering Chemistry Research, 2008A new approach for the optimal design of mixed refrigerant cycles is presented. It is based on mathematical programming and offers significant improvements in relation to previous approaches. It includes multistage refrigerant compression, full enforcement of the minimum temperature difference in heat exchangers, simultaneous optimization of variables,
Frank Del Nogal +3 more
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Micro Cryogenic Coolers With Mixed Refrigerants
Volume 1: Advanced Packaging; Emerging Technologies; Modeling and Simulation; Multi-Physics Based Reliability; MEMS and NEMS; Materials and Processes, 2013A number of small electronic devices benefit from micro-scale low temperature operation. Recently we have developed micro cryogenic coolers (MCCs) using a low-pressure, mixed-refrigerant Joule-Thomson cycle. The cryocoolers utilizes a MEMS-enabled gas compressor coupled to a micro cold stage.
Ryan Lewis +5 more
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