A numerical simulation on heat transfer process of the cascade heat exchanger in a cascade refrigeration system using R134a/R744
Abstract This study presented on simulating the heat transfer process of the micro plate heat exchangers in a cascade refrigeration system with the R134a/R744 by using COMSOL Multiphysics 6.2 software. Quantities characterizing the phase change were mentioned such as temperature field, vapor quality...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Springer
2025-05-01
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| Series: | International Journal of Air-Conditioning and Refrigeration |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/s44189-025-00075-1 |
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| Summary: | Abstract This study presented on simulating the heat transfer process of the micro plate heat exchangers in a cascade refrigeration system with the R134a/R744 by using COMSOL Multiphysics 6.2 software. Quantities characterizing the phase change were mentioned such as temperature field, vapor quality, and density. The results indicate that the outlet temperature of R744 increased with the increasing of the evaporating temperature of R134a. Moreover, the simulation results indicate that in the early stage about one-third of the path of the fluid channel, the R744 fluid has a large temperature drop. From the second-third of the fluid channel to the outlet of the heat exchanger, R744 began to condense, so the temperature fluctuated insignificantly. Besides, the vapor quality and density of R744 and R134a were also shown in this study. In addition, the results were validated to the experimental data with the mean errors within allowable limit, reaching 4.5% for R744 and 2.5% for R134a. Based on the simulation results, a prediction of thermodynamic parameters was made to calculate the coefficient of performance (COP); the COP gradually decreases from 1.599 to 1.583 in simulation while it is from 1.559 to 1.541 in experiment with a mean error of 2.44% and a maximum relative error of 2.65%. |
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| ISSN: | 2010-1333 |