TY - JOUR
TI - Vapor injection technology for heat-pump air conditioner of electric bus in an extreme environment
AU - Cui Siqi
AU - Bai Jing
AU - Su Zhiyong
AU - Zhang Chao
AU - Qin Chang
AU - Geng Shuwei
JN - Thermal Science
PY - 2022
VL - 26
IS - 3
SP - 2683
EP - 2691
PT - Article
AB - In order to solve the problems of a heat pump air conditioner for an electric  bus under extreme conditions, such as the large compression ratio, the high  discharge temperature, the reduced system performance, the frequent  shutdown of the compressor due to the overheat protection, this paper  proposes a vapor injection technology with an economizer, and carries out a  theoretical analysis of the process to reveal the effect of the vapor  injection technology on the performance of the air conditioner. The results  show that at ultra-low temperature heating operating conditions, when the  compressor speed increases from 2000 rpm to 5000 rpm, the heating capacity  of the vapor injection system increases from 16.2% to 22.7%, and the heating  performance coefficient increases from 2.8% to 14.2%.