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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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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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Mixed refrigerant Joule-Thomson sorption cryocoolers
AIP Conference Proceedings, 2014Joule-Thomson (JT) sorption cryocooling is the most mature technology for cooling from a normal Room-Temperature (RT) down to temperatures below 100 K in the absence of moving parts. Therefore, high reliability and no vibrations are attainable, in comparison with other cryocoolers.
Nir Tzabar, Gershon Grossman
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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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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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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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Real-time measurement of mixing ratio of refrigerant/refrigeration oil mixture
International Journal of Refrigeration, 2006The mixing of refrigeration oil with refrigerant in a refrigeration cycle has great influence on cycle performance. A sampling method is the most general way to measure the mixing ratio of refrigerant and refrigeration oil. Since the sampling method is time-consuming and reduces the amount of refrigerant and oil in the cycle, a real-time measurement is
Mitsuhiro Fukuta +3 more
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The Journal of Physical Chemistry B, 2020
Molecular simulations were performed to evaluate mixtures of fluorinated refrigerants with deep eutectic solvents (DESs), for potential use in single-effect absorption refrigeration cycles that use low quality waste heat sources at temperatures of ∼80 °C.
Rubaiyet Abedin +3 more
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Molecular simulations were performed to evaluate mixtures of fluorinated refrigerants with deep eutectic solvents (DESs), for potential use in single-effect absorption refrigeration cycles that use low quality waste heat sources at temperatures of ∼80 °C.
Rubaiyet Abedin +3 more
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Optimization of a vapor injection refrigeration cycle using hydrocarbon mixed refrigerants
International Journal of Refrigeration, 2019Abstract Refrigeration systems are major consumers of electrical energy in many process industries. Hydrocarbons have regained interest as refrigerants because of the increasing restrictions applied to halogenated fluids. In this work, the use of hydrocarbons mixed refrigerants and an alternative flash tank with vapor injection (FTVI) refrigeration ...
Stella Maia Rocha de Carvalho +4 more
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Performance of two mixed refrigerant processes providing refrigeration at 70 K
Cryogenics, 2016Abstract Mixed refrigerant process refrigerators are ideal for use in superconducting transformers, fault current limiters, etc. placed in a liquid nitrogen bath. Traditional mixed refrigerant processes used above 70 K cannot be used in these applications. The performance of two mixed refrigerant processes suitable for the above applications has been
Vineed Narayanan, G. Venkatarathnam
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