期刊
APPLIED THERMAL ENGINEERING
卷 127, 期 -, 页码 800-811出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2017.08.098
关键词
Heat pump; Electric vehicle; Vapor injection; Injection port; Dual injection
资金
- Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant - Korea Government Ministry of Knowledge Economy [20124010203250, 20142020104520]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20142020104520] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Heat pumps, which enable the cooling and heating of vehicular cabins, consume a significant portiori of the total energy consumption in electric vehicles (EVs). The efficiency of the heat pump is typically degraded owing to cold-weather conditions, so the refrigerant-injection technique has been proposed for improving the system performance and compressor reliability. In this study, a simulation model for an R134a heat pump with vapor injection is developed and validated by performing thermodynamic analyses with geometrical information. The effects of the injection-port design are investigated using the developed numerical model. Single-injection and dual-injection ports are considered to optimize the coefficient of performance (COP) and isentropic efficiency by controlling the injection mass flow rate. The optimal angles of the single- and dual-injection ports are determined to be 440 and 535 /355 (for pocket AFB), respectively, while the corresponding COPs are improved by 7.5% and 9.8%, respectively, compared to the non-injection heat pump at an outdoor temperature of 10 degrees C. (C) 2017 Elsevier Ltd. All rights reserved.
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