Study On The Impact Of Unglazed Transpired Collectors On Heat Transfered Through Walls

Solar energy is a kind of clean and renewable energy,the utilization technology of it has attracted the attention of the world for many years.China is still satisfy its energy demand by using fossil energy,but China has an abundant resource of solar energy,thus,it's a suitable way to decrease building energy consumption by using solar energy in China.The installation of unglazed transpired collector is a method for utilizing the solar energy.Firstly,This paper analyzed the heat transfer process of ordinary walls,the mathematical expressions of the impacts caused by interference were derived,the one dimensional unsteady discretization equations based on outside node and the mathematical model obtained by control volume method,The stabilityand verification of the model has been analysed,the numerical simulation program is compiled through MATLAB,and the heat transfered through walls has been calculated through the program.The heat transfer process in the winter and summer of unglazed transpired collector is researched by this paper,and the mathematical expressions of this process were derived after the thermal balance analyzation of each part of unglazed transpired collector,the two dimensional unsteady discretization equations obtained by domain discretization.The correctness of the model is verified through the error analysis and mesh independent verification.The wall heat transfer of different areas were calculated based on the meteorological data and the MATLAB program,the impacts of weather conditions and wall parameters on the collector obtained by comparing with the ordinary wall heat transfer.And providing valuable reference to collector selection by summarizing the application areas,the conclusion that unglazed transpired collector is more suitable for cold area has been obtained.And the simulation of renovation project in Beijing area was finished at last in this article,the effect to the wall heat transfer by using collectors was calculated and simplified into equivalent thermal resistance,and the factors that influence the equivalent thermal resistance has been summarized by analyze the result.