由彭经纬、李慧和张春路（通讯作者）撰写的论文Performance comparison of air-source heat pump water heater with different expansion devices在Applied Thermal Engineering, 2016年第99卷在线发表。论文建立了空气源热泵热水器的仿真模型并进行了从高温工况到低温工况的实验验证。基于验证的仿真模型，论文对比研究了电子膨胀阀、节流短管、毛细管三种节流元件用于空气源热泵热水器的性能，并进行了深入的理论分析。结果表明，在成本控制时，节流短管系统性能要明显优于毛细管系统性能。

论文链接：http://www.sciencedirect.com/science/article/pii/S1359431116300631

免费下载链接：http://authors.elsevier.com/a/1Sqep4r6KuoA5N(有效期至2016年5月26日)

论文摘要：

Air source heat pump water heater (ASHPWH) is designed to work under wide operating conditions. Therefore both the system and components require higher reliability and stability than ordinary heat pump air-conditioning systems. In this paper, a quasi-steady-state system model of ASHPWH using electronic expansion valve (EEV), capillary tube or short tube orifice as expansion device is developed and validated by a prototype using R134a and scroll compressor, by which the system performance is evaluated and compared at varying water temperature and different ambient temperature. Flow characteristics of those three expansion devices in ASHPWH are comparatively analyzed. Results show that the EEV throttling system performs best. Compared with capillary tube, flow characteristics of short tube orifice are closer to that of EEV and therefore more suitable for ASHPWH. Reliability concern of liquid carryover to the compressor in the system using short tube orifice is investigated as well. Higher superheat or less system refrigerant charge could help mitigate the risk.