Exergetic Investigation of the Effects of Superheating and Subcooling on Performance of a Vapor Compression Refrigeration Cycle

Year 2020, Volume: 4 Issue: 4, 152 - 157, 20.12.2020

İbrahim Karaçaylı Erdoğan Şimşek

https://doi.org/10.26701/ems.742973

Cited By: 1

Abstract

The aim of this study is to investigate the effects of superheating and subcooling values on the cooling performance of a vapor compression refrigeration cycle. For this purpose, a refrigeration cycle with cooling capacity of 8 kW using R404A was examined by changing superheating and subcooling values. Energy, exergy and entropy balances were applied for evaporation and condensation temperatures of 0℃ and 45℃, respectively. In order to evaluate the performance of the refrigeration cycle, coefficient of performance (COP) for cooling, the amount of energy transfer, rate of exergy destruction and rational exergy efficiency of the all components (evaporator, compressor, condenser and expansion valve) and the whole system were determined.

Keywords

Exergy, Exergy destruction, Refrigeration cycle, Superheating, Subcooling

References

• Moran, M. J., Shapiro, H. N., Boettner, D. D., Bailey, M. B. (2010). Fundamentals of Engineering Thermodynamics. John Wiley & Sons.
• Dingeç, H., İleri, A. (1999). Thermoeconomic optimization of simple refrigerators. Int J Energy Research, 23(11): 949-962, DOI:10.1002/(SICI)1099-114X(199909)23:11<949::AID-ER531>3.0.CO;2-A
• Selbaş, R., Kızılkan, Ö., Şencan, A. (2006). Thermoeconomic optimization of subcooled and superheated vapor compression refrigeration cycle. Energy, 31(12): 2108-28, DOI:10.1016/j.energy.2005.10.015
• Bilgili, M., Cardak, E., Aktas, A. E. (2017). Thermodynamic analysis of bus air conditioner working with refrigerant R600a. European Mechanical Science 2017, 1(2): 69-75, DOI:10.26701/ems.321874.
• Yılmaz, A., Aktas, A. E. (2019). Comparative analysis of ejector refrigeration system powered with engine exhaust heat using R134a and R245fa. European Mechanical Science, 3(1): 13-17, DOI:10.26701/ems.430831.
• Beşer, E.,Mobedi, M. (1999). Soğutma sistemlerinde soğutucu akışkanın aşırı soğutulmasının incelenmesi. IV. Ulusal Tesisat Mühendisliği Kongresi, Conference Proceedings, p.695-706.
• Kızılkan, Ö., Selbaş, R., Şencan, A. (2006). Buhar sıkıştırmalı soğutma sistemlerinde aşırı soğutma ve aşırı kızdırma etkisinin ısıl ekonomik açıdan incelenmesi. Gazi Üniversitesi Mühendislik Mimimarlık Fakültesi Dergisi, 21(2): 387-393.
• Yan, G., Liu, Y., Qian, S., Yu, J. (2019). Theoretical study on a vapor compression refrigeration system with cold storage for freezer applications. Applied Thermal Engineering, 160: 114091, DOI: 10.1016/j.applthermaleng.2019.114091.
• Chen, E., Li, Z., Yu, J., Xu, Y., Yu, Y. (2019). Experimental research of increased cooling output by dedicated subcooling. Applied Thermal Engineering, 154: 9–17, DOI: 10.1016/j.applthermaleng.2019.03.071.
• Bellos, E., Tzivanidis, C. (2019). A Comparative Study of CO2 Refrigeration Systems. Energy Conversion and Management: X, 1, Article 100002, DOI: 10.1016/j.ecmx.2018.100002.
• Wang, G.-B., Zhang, X.-R. (2019) Thermoeconomic optimization and comparison of the simple single-stage transcritical carbon dioxide vapor compression cycle with different subcooling methods for district heating and cooling. Energy Conversion and Management, 185: 740-757, DOI: 10.1016/j.enconman.2019.02.024.
• Cengel, Y. A., Boles, M. A. (2015). Thermodynamic: an engineering approach. McGraw-Hill Education, New York.
• Hepbasli, A., Akdemir, O. (2004). Energy and exergy analysis of a ground source (geothermal) heat pump system. Energy Conversion and Management, 45 (5): 737-753, DOI:10.1016/S0196-8904(03)00185-7.
• Brunin, O., Feidt, M., Hivet, B. (1997). Comparison of the working domains of some compression heat pumps and a compression-absorption heat pump. International Journal of Refrigeration, 20(5): 308-318, DOI:10.1016/S0140-7007(97)00025-X.
• Karaçaylı, İ., Şimşek, E. (2019). Irreversibility analysis of a minibus air-conditioner for different condensation pressures. Çukurova University Journal of the Faculty of Engineering and Architecture, 34(2): 171-180, DOI:10.21605/cukurovaummfd.609114.