Numerical study of the effects of injection-port design on the heating performance of an R134a heat pump with vapor injection used in electric vehicles
- Authors
- Jung, Jongho; Jeon, Yongseok; Lee, Hoseong; Kim, Yongchan
- Issue Date
- 25-12월-2017
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Heat pump; Electric vehicle; Vapor injection; Injection port; Dual injection
- Citation
- APPLIED THERMAL ENGINEERING, v.127, pp.800 - 811
- Indexed
- SCIE
SCOPUS
- Journal Title
- APPLIED THERMAL ENGINEERING
- Volume
- 127
- Start Page
- 800
- End Page
- 811
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/81130
- DOI
- 10.1016/j.applthermaleng.2017.08.098
- ISSN
- 1359-4311
- Abstract
- 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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Collections - College of Engineering > Department of Mechanical Engineering > 1. Journal Articles
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