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
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
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DOI：
10.1016/j.applthermaleng.2017.08.098
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发表时间：
2017-12
影响因子：
6.4
通讯作者：
Jongho Jung;Y. Jeon;Hoseong Lee;Yongchan Kim
中科院分区：
文献类型：
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作者：
Jongho Jung;Y. Jeon;Hoseong Lee;Yongchan Kim
热泵能够冷却和加热车厢，消耗电动汽车（EV）总能耗的很大一部分。由于寒冷的天气条件，热泵的效率通常会下降，因此制冷剂注入技术已被提出来改善系统性能和压缩机的可靠性。在这项研究中，蒸汽喷射的R134 a热泵的模拟模型的开发和验证进行热力学分析与几何信息。使用开发的数值模型的注射端口设计的影响进行了研究。单喷射和双喷射端口被认为是通过控制喷射质量流量来优化性能系数（COP）和等熵效率。单喷射口和双喷射口的最佳角度分别确定为440°和535°/355°（对于袋A/B），而与室外温度为−10 °C的非喷射式热泵相比，相应的COP分别提高了7.5%和9.8%。
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.