In this paper, an automotive ultra-low temperature heat pump air conditioning system based on the economized vapor injection (EVI) technology is proposed. The new low-global warming potential (GWP) R1234yf is used as the refrigerant. Besides, the comparative performance test in R134a and system optimization are conducted. In the ultra-low temperature environment of -20℃, the heating performance and coefficient of performance (COP) of this system can reach 2kW and 2.0, which is 30% and 14% higher than those of the traditional heat pump. Thus, the system can meet the heating requirements of crew cabin in a low temperature environment. The heating capacity of the R1234yf system is a little bit lower but pretty much the same as R134a. Moreover, the effect of EVI for R1234yf refrigerant is better than that of R134a. Increasing the inner-condenser area and optimizing components, such as outdoor heat exchanger and compressor, can significantly improve heat pump air conditioning system performance and its energy efficiency.
LIU Yusheng,LI Wanyong,ZHANG Li,SHI Junye,CHEN Jiangping
. Performance of Automotive Ultra-Low Temperature Economized Vapor
Injection Heat Pump Air Conditioning Using R1234yf Refrigerant[J]. Journal of Shanghai Jiaotong University, 2020
, 54(10)
: 1108
-1116
.
DOI: 10.16183/j.cnki.jsjtu.2019.244
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