ASHRAE研究项目780评估了现有热泵测试和评级方法假设与家用燃气发动机驱动热泵（GEHP）测试方法的相关性。GEHP系统的固有循环行为表明，将加热循环试验从20%的占空比改为35%的占空比。GEHP季节性供暖性能应根据设计供暖要求（DHR）最大和最小负荷进行计算，以涵盖预期的热负荷范围，反映出GEHP的大小可以适应主要供暖气候下的热负荷。冷却负荷过大将有助于提高季节性冷却性能，同时保持足够的湿度控制。由于所用公式的特点，在测试程序中使用二次拟合插值性能可能会产生错误的结果。对性能计算中使用的盘管污垢、室外低温断路器和温度箱尺寸标准的更改被判定为“不保证”，因为敏感性分析表明，这些参数对性能没有显著影响。 单位:双引文:研讨会，ASHRAE交易，1998年，第104卷，pt。1A，旧金山

ASHRAE Research Project 780 evaluated the relevance of existing heat pump testing and rating method assumptions to a method of test for residential gas engine-driven heat pumps (GEHP). The intrinsic cyclic behavior of GEHP systems suggests changing the heating cycling test from a 20% duty cycle to a 35% duty cycle. GEHP seasonal heating performance should be calculated for the design heating requirement (DHR) maximum and minimum loads to encompass the range of expected heating loads, reflecting that the GEHP can be sized for the heating load in predominantly heating climates. Oversizing for the cooling load will tend to improve the seasonal cooling performance while maintaining adequate humidity control. Using quadratic fits to interpolate performance in test procedures can produce erroneous results due to the characteristics of the formulas used. Changes to standards dealing with coil fouling, low outdoor temperature cutout, and size of temperature bins used in the performance calculations were judged "not warranted" because sensitivity analyses indicated that performance was not significantly affected by these parameters.Units: Dual