The Theoretical Analysis And Experimental Study On Multi-function Heat Pump Water Heater

Energy-conservation is the eternal theme of the technical development of water heating, but high-energy consumption is the shortcoming that the common technology of water heating can't deal with. The technology of heat pump is an important means to develop and strengthen the utilization ratio of high quality energy; also it is one of the effective ways of obtaining the regenerated energy and safeguarding the ecological balance.The system that this paper studied --The multi-function heat pump water heater combined the heat pump of air conditioner with water heater together well, when the evaporator worked inside, the indoor temperature and humidity could be decreased, simultaneously the system could make use of the heat of the condenser to produce hot water. It might serve as water heater of heat pump in spring and autumn when air conditioner was not needed. But it still could be used to heat as heat pump in winter, and could supply hot water through switching. As the following of research contents in this paper:(1) A set of multi-function heat pump water heater experimental equipment had been designed and built up. It was a multi-functional sample device refitted by a cabinet-type air conditioner, and could be used as air conditioner, heat pump and water heater. It could offer the hot water while it was in the cooling mode, and also, it could embody the multi-functional characteristics of heat pump water heater in winter.(2) The principle and structure of the system were simply introduced and studied; also mathematic models on indoor evaporator, outdoor condenser and heat exchanger by the side of water heater were established; moreover, numerical simulation and analysis were carried on.(3) The system performance had been studied in the condition of different status, such as, the cooling and water heating in summer, water heating in the other seasons,furthermore, the influence of the parameters'change on the system was analyzed, all the work provided some experimental data for the similar design and mend in the future.(4) Economical comparison with other water heater was carried on, the result showed that this system of water heater are more energy-saving and economical.