Abstract
Abstract Vapor injection technology has been applied to improve the performance of heat pump systems at low ambient temperatures. However, little attention has been paid to the application of heat pump systems combined with the economized vapor injection for electric vehicles. In this study, the performances of two electric vehicle system configurations were compared, including the upstream injection and the downstream injection. The effects of the injection pressure, the compressor speed, the condenser and outdoor inlet temperatures on the overall system performance and specific operating parameters were measured and analyzed in detail. The results indicated that the downstream injection exhibited better system performance. At the compressor speed of 6500 rpm, the maximum heating capacity of the downstream injection was 18.6% and 8.9% higher than that of the upstream injection at the condenser inlet and outdoor temperatures of −2 °C and −12 °C, −7 °C and −18 °C, respectively. At the compressor speed of 4500 rpm, the COP of the downstream injection was 12.9% higher at the condenser inlet and outdoor temperatures of −7 °C and −18 °C.
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