A Comparative Performance Study of an Ejector-Expansion Refrigeration Cycle Using R134a and its Alternatives: Application of Automobile Air Conditioning

IF 0.8 Q4 THERMODYNAMICS

International Journal of Air-conditioning and Refrigeration Pub Date : 2021-12-17 DOI:10.1142/s2010132521500358

K. Al‐Chlaihawi, H. Kadhim, Ahmad Hashim Yousif

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引用次数: 1

Abstract

In this study, the performance of ejector-expansion refrigeration cycle (EERC) with R134a alternative refrigerants (R152a, R1234yf, R404A, R407C, R507A and R600a) for automobile air-conditioning application is investigated numerically. The ejector is modeled with a constant mixing-pressure assumption taking into consideration the friction effect in the ejector mixing section. The studied refrigerants are compared based on the optimum area ratio, discharge temperature, compressor input power, volumetric cooling capacity, exergy destruction, COP, exergy efficiency and COP improvement. The results show that R152a and R1234yf have the closest performance to R134a and can be considered the most suitable alternative refrigerants for R134a. The COP and exergy efficiency are improved by 2.26% and 2.27%, respectively, using R152a compared to the use of R134a, whereas they are reduced by 2.89% and 2.88% using R1234yf. The volumetric cooling capacity is reduced for both R152a and R1234yf by 6.14% and 6.8%, respectively. In addition, the effect of compressor rotational speed on the performances is reported.

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R134a喷射器-膨胀式制冷循环及其替代品的性能对比研究:在汽车空调中的应用

本文以R134a替代制冷剂(R152a、R1234yf、R404A、R407C、R507A和R600a)为研究对象，对喷射器-膨胀式制冷循环(EERC)在汽车空调中的应用进行了数值模拟。考虑喷射器混合段的摩擦效应，采用恒定混合压力假设对喷射器进行建模。根据最优面积比、排气温度、压缩机输入功率、容积制冷量、火用破坏、COP、火用效率和COP改善对所研究的制冷剂进行了比较。结果表明，R152a和R1234yf的性能最接近R134a，可以认为是R134a最合适的替代制冷剂。与使用R134a相比，R152a的COP和火用效率分别提高了2.26%和2.27%，而使用R1234yf的COP和火用效率分别降低了2.89%和2.88%。R152a和R1234yf的体积制冷量分别降低了6.14%和6.8%。此外，还报道了压缩机转速对性能的影响。

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来源期刊

International Journal of Air-conditioning and Refrigeration THERMODYNAMICS-

CiteScore

2.70

自引率

10.00%

发文量

期刊介绍： As the only international journal in the field of air-conditioning and refrigeration in Asia, IJACR reports researches on the equipments for controlling indoor environment and cooling/refrigeration. It includes broad range of applications and underlying theories including fluid dynamics, thermodynamics, heat transfer, and nano/bio-related technologies. In addition, it covers future energy technologies, such as fuel cell, wind turbine, solar cell/heat, geothermal energy and etc.