洗浴废水中含有大量废热，为最大限度地回收洗浴废水热能，提出了双机串联大温差热泵机组。机组额定设计工况为：蒸发器侧洗浴废水进出口温度分别为30℃和6℃，冷凝器侧自来水进口温度为10℃，制取热水出口温度为45℃。通过实验研究了自来水进口温度、热水出口温度及洗浴废水入口温度对热泵机组制热性能（COP）的影响。实验结果表明，当自来水进口温度从5℃升高到15℃时，整体机组COP从5.0降低到3.85；当热水出口温度从40℃变化到50℃时，整体机组COP降低了7.5%；当洗浴废水进口温度从30℃升高到35℃时，整体机组COP提高了3.1%。在无辅助热源时，若洗浴废水温度从30℃降低到6℃，热水出水温度为45℃，自来水的温度必须要高于12℃；若洗浴废水入口温度达到35℃，即使自来水温度为6℃，热水出口温度也能达到45℃。

Bathing was tewater contains a large amount of neaste heat, a double heat pump unit in series with large temperature difference was proposed to maximize the recovery of waste heat energy from bathing wastewater. The rated design conditions of the unit are as follows, the inlet and outlet temperatures of the bathing wastewater on the evaporator side are 30℃ and 6℃、respectively and the inlet temperature of tap water on the condenser side is 10℃ with hot water outlet temperature at 45℃. In this study, the effects of inlet temperature of tap water, outlet temperature of hot water and inlet temperature of bath wastewater on thermal performance of heat pump unit were studied experimentally. The experimental results showed that the COP reduced from 5.0 to 3.85 as the inlet temperature of tap water increased from 5℃ to 15℃. When the outlet temperature of the hot water changed from 40℃ to 50℃, the COP reduced by 7.5%. And when the inlet temperature of bathing wastewater rose from 30℃ to 35℃, the COP increased by 3.1%. In the absence of an auxiliary heat source, if the bathing wastewater temperature reduces from 30℃ to 6℃, the tap water temperature must be higher than 12℃ to ensure that the hot water outlet temperature is 45℃. Besides, when the inlet temperature of bathing wastewater reaches 35℃, the hot water outlet temperature can also reach 45℃ even if the tap water temperature is 6℃.

TU832.1;TK11

国家自然科学基金（51676026）