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

Jongho Jung, Yongseok Jeon, Hoseong Lee, Yong Chan Kim

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Heat pumps, which enable the cooling and heating of vehicular cabins, consume a significant portion 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 A/B), 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 °C.

Original languageEnglish
Pages (from-to)800-811
Number of pages12
JournalApplied Thermal Engineering
Volume127
DOIs
Publication statusPublished - 2017 Dec 25

Keywords

  • Dual injection
  • Electric vehicle
  • Heat pump
  • Injection port
  • Vapor injection

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Industrial and Manufacturing Engineering

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