Comparative experimental study of low GWP alternative for R134a in a walk-in cold room |
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| Affiliation: | 1. Mechanical Power Engineering Department, Tanta University, Faculty of Engineering, Egypt;2. Department of Mechanical Engineering, Faculty of Engineering, Taif University, Al-Haweiah, P.O. Box 888, 21974, Saudi Arabia;1. Institute of Refrigeration and Cryogenics, School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;2. Institute of Refrigeration and Cryogenics, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;3. School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang avenue, Singapore 639798, Singapore |
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| Abstract: | The environmental problems induced by the ongoing increase in the global worming potential (GWP) pose a significant interest among researchers. It was found that, the currently used refrigerants are with high GWP (National Refrigerants Inc., 2004), so that it becomes necessary to search for alternatives to these refrigerants that can properly operate on the same systems but with low GWP. Therefore a walk-in cold room working with vapor compression cycle is constructed and tested in this paper. The performance of R134a refrigerant with high GWP is compared to another low GWP refrigerant R1234ze in a trail to provide a solution of the problem of high GWP of refrigerants currently used in cold rooms. The results obtained in this study have shown that, the cooling capacity of R1234ze was lower than that of R134a by 2% to 13%. The lowest evaporating temperature that could be reached for R1234ze is −13 °C while the lowest temperature of R134a is −30 °C. Regarding the power consumption, R1234ze has lower power consumption than R134a by about 9% to 15% therefore it can be concluded that R 1234ze can be recommended to be used at high and medium evaporating temperature after carrying out the suitable modifications on the refrigeration cycle. |
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