使用参数测试矩阵对三台热泵热水器（HPWH）机组进行了评估，它们代表了主要制造商的首次国内产品。测试的三台机组在以下方面有所不同:所用制冷剂、压缩机尺寸、蒸发器风扇尺寸、车载电阻热量、冷凝器设计、储罐尺寸、设备（控制）设置的数量和类型，以及影响性能的其他因素。该实验室测试的重点是设备设置和热水抽取模式对HPWH性能和效率的影响，环境焓（在环境室内）、总水管温度和恒温器设定值的变化有限。此外，通过在稳定条件下进行扩展测试，量化了每个单元的空间调节效果。 观察了每个单元的一系列性能和效率，高于和低于标准化测试指标下的结果。还观察了三个HPWH在不同需求、运行条件和HPWH系统设计中管理其热储的方式。引文:伊利诺伊州芝加哥ASHRAE Transactions第118卷第1部分

Three Heat Pump Water Heater (HPWH) units, representing the initial domestic offerings by the major manufacturers, were evaluated using a parametric test matrix. The three units tested vary in: refrigerant used, compressor size, evaporator fan size, amount of onboard electric resistance heat, condenser design, storage tank size, number and type of appliance (control) settings, and other factors that influence performance. The focus of this laboratory testing was the influence of appliance setting and hot water draw pattern on HPWH performance and efficiency, with limited variation of ambient enthalpy (within an environmental chamber), water main temperature, and thermostat setpoint. Additionally, the space conditioning effect of each unit was quantified through extended testing at stable conditions. A range of performance and efficiency was observed for each unit, both above and below results under standardized test metrics. Observations were also made of the manner in which the three HPWHs manage their thermal stores across varied demand, operational conditions, and HPWH system designs.