| From the view of energy and environment which is facing enormous challenge and the characteristic of solar resource in Xizang which is sanitary and available in abundance, this paper studies on the solar assisted heat pump system for heat supply which is in Xizang office building.First, from the theory of heat pump and solar energy collector, the paper brings forward the scheme of the solar heat pump. Based on analyzing the theory, the paper writes the design of the solar assisted heat pump system for heat supply, the selection of compressor, evaporator, condenser, throttle and so on, and the design of the area of the solar energy collector, the capacity of the water tank and the testing system. The working field of the system is R22.Second, based on analyzing the data of every part of the system, it can be educed that the system reached the need of designing. The COP of the heat pump is 3.1. It also can be educed that the heat exchange between cooling water and working field in evaporator is not completely, and the heat which tank water absorbed from the solar energy collector is lager than the heat which evaporator absorbed from tank water. Because the equipment of heat preservation is not good, a majority of heat is dissipated in the atmosphere, which makes a lot of waste.Third, combining the data and the modeling of the solar assisted heat pump, the system is optimized by enlarging the area of evaporator, enhancing the capability of heat preservation of tank water, and minishing the area of the solar energy collector and so on. Through analyzing the optimized system, it can be educed that the COP of the system and the efficiency of the collector etc are improved, and the temperature of the tank water is most important of the system.Lastly, the paper discusses the stability, saving the energy sources, environmental conservation, technology and economy of the solar assisted heat pump, and further analyzes the advantages and disadvantages of this technology. |
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