Experimental study of domestic shower drain source heat pump water heaters

To utilize the energy of domestic shower drains, puts forward a water heater system using shower waste water source heat pump for family. Designs a shower waste water heat extraction device and sets up a system test platform. By means of experiment, discusses the system performance under different heat extraction modes during shower. Analyses the effect of pre-heated water loop on the system characteristics. The results show that the outlet water temperature is increased by 8.3 ℃ through the pre-heated water loop, and the corresponding average COP of the system is increased to 3.21 from 2.19 without the pre-heated water loop.