| In this paper,throught upbuilding and solving mathematical models of different solar heating systems,solar energy collected and solar contribution for space are calculated.With comprehensive consideration of economic,energy-saving and environmental benefit,the superiority of solar heat pump heating system for space and the the best scheme for space heating can be identified.First,this paper introduces solar resource distribution and characteristics,then provides calculation method related to solar radiation and collector efficiency equations based on three different temperatures.Then proposes solar direct heating system,solar heat pump indirect heating system and solar heat pump alternate heating system for space.Mathematical models of solar water tank in different operational modes are established.Secondly,experiment on the heat pump system is carried out.With experimental datas,the relationships between heating capacity of heat pump system and tank water temperature,between heat absorption capacity of heat pump system and tank water temperature are identified,and the mathematical models of solar water tank can be solved.So the operating condition and tank volume of different solar heating system and the heating system types for different buildings are determined.And the amount of solar energy colledted and solar contribution for space in Tianjin are analyzed.Finally,with comprehensive consideration of economic,energy-saving and environmental benefit of solar heat pump and solar direct heating system,we can come to a conclution that: either for the building with the allday-heating or the daytime-heating,solar heat pump heating system performs better than solar direct heating system,and the solar heat pump alternate heating system combined electricity for space is the best scheme. |
