Experimental study on heat pump integrating air conditioner and water heater with heat recovery of shower waste water

In order to save energy, a type of heat pump integrating air conditioner and water heater is designed and fabricated in our laboratory. By effectively recovering heat from shower waste water, it can supply enough hot water for bath and meet the requirement of personal air conditioning after bath. Experiments and analysis show that when the temperatures of room, city water and shower waste water are 22~23°C, 20°C and 31~34°C, respectively, it can supply hot water at temperature of 42.6~43.4 °C with flow rate of 4.72~ 5.27 L/min, and supply conditioned air at temperature of 12.3~14.7°C with corresponding cooling capacity of 520~690W for personal air conditioning. On the experiment conditions, the measured coefficient of heating performance (COPh) of the heat pump varies in the range of 4.57~5.38, which is perfect and attractive. Based on the experiments and analysis, some suggestions about improving the overall performance of the heat pump are also mentioned in briefly.