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Indexed by:会议论文

Date of Publication:2009-01-01

Included Journals:CPCI-S

Page Number:678-684

Key Words:Solar energy; Flat-plate collector; High temperature circulating fluid; Numerical simulation; Thermal process

Abstract:In part I of this article, numerical simulation method to study the thermal process of the flat-plate collector (FPC) was introduced. And the thermodynamic and transport properties models are described for the high temperature working fluid. Instantaneous curve of temperature variation with time of each parts of FPC and the working fluid have been obtained, and the thermal process characteristics have been analyzed. In this paper, based on the new refrigerant R245fa, the thermal processes of flat-plate solar collector are investigated numerically in different regions of China. Here, five cities, Lhasa, Urumchi, Lanzhou, Van, Dalian, have been chosen as research objectives. The thermal collection processes characteristics of the flat-plate solar collector in the five cities are analyzed. And the influences of the total mass of the working fluid and the areas of the flat-plate solar collector on thermal collection processes are investigated. It is found that the thermal collection processes of the solar energy collection system is influenced strongly by the solar radiation, and the influence of the initial working fluid temperature and the ambient temperature on the thermal collection processes is small compared with the solar radiation. In the processes of working fluid temperature rising from the ambient temperature to the evaporation state, the running time of the solar collection system can be decrease effectively if the total mass of the working fluid in the system is decreased or the area of solar collector is increased. And the scheme to increase area of solar collector is best compare with that to decrease total mass of the working fluid.