Applicability Of Air-source Water Heater Of Chongqing Hilly Rural Residential

With the on-the-spot investigation and the actual measurement, this subject mainly research the practicability of the air-source heat pump domestic hot water system in mountainous villages, finding the potential for system optimization.Through the field investigation, the rustic residents’ demand of domestic hot water stands out. 39% of residents still use a original way, burning firewood, to get hot water,which is inconvenient and anti-environmental. 30% of inhabitants use the natural gas water heater, however, hilly characteristics make it’s hard to laying gas pipes. 16% of dwellers adopt the electric water heater, with low energy efficiency, which has the risk to get an electric shock. The remaining 15% use the solar water heater, which must use electric auxiliary heat in winter.Through the actual operation parameters of the air-source heat pump water heater,boot time of the unit, the system running time, heating temperature, the outdoor air temperature and inflow water temperature appear as main influence factors of the system operating energy efficiency. All of main influence factors can be divided into artificial adjusting operation parameters and regional meteorological parameters.The longer the running time, the lower the operating efficiency. The efficiency of the low temperature hot water system not always higher than than the high temperature hot water system. For the system operating efficiency, outdoor air temperature is more significant than inflow water temperature.The local supreme outside temperature moment is 17:00. As the outdoor air temperature will significantly influence the performance of the system, this research analyzes the operating parameters of the system which activates at 17:00. The result indicates that the scheme is likely to save power.Combine the actual measured data, local meteorological parameters and the research conclusion, they join together to make an annual optimum operating scheme of air-source heat pump water heater in the mountain village.