风口参数对集热蓄热墙通风及换热特性的模拟研究

Simulation study on theventilation and heat transfer performance of the ventilation openings parameters of Trombe wall

为了提高集热蓄热墙的通风与换热特性,分别设计了有外保温结构的集热蓄热墙通风和供热的模型,使用Fluent模拟软件对有外保温结构的集热蓄热墙的不同风口参数下的集热蓄热墙通风和供热性能进行模拟。得知风口形状、风口面积及进出风口的相对大小都对有外保温结构的集热蓄热墙通风和供热特性产生了较大影响,其中长方形风口优于正方形风口;风口面积等比增大可提高其通风量减少其换热量;对于夏季通风模式,风口的出口面积大于进口面积可增大通风量;对于冬季供热模式,出口面积小于进口面积可增大换热量。在实际工程中应合理设计风口,以达到集热蓄热墙的最佳性能。

In order to improve the ventilation and heat transfer performance of the Trombe wall, the ventilation and heating models of the Trombe wallwith external thermal insulation structure was designed. This paper simulates the ventilation and heat transfer performance of the Trombe wallwith external thermal insulation structure under different ventilation openings parameters by using Fluent simulation software. The results show thatthe shape ofventilation openings, the area of ventilation openings and the relative size of inlet and outlet have great influence on the ventilation and heat transfer performance of theTrombe wallwith external thermal insulation structure. The performance of rectangular ventilation openings is better than that of square. Increasing the ventilation openings area with equal proportion can improve the air mass flow and reduce the heat transfer. For summer ventilation mode, the outlet area is larger than the inlet areacan increase the air mass flow. For winter heating mode, the outlet area is smaller than the inlet area can increase the heat transfer. In practical engineering, the ventilation openings should be designedreasonably to achieve the best performance of the Trombe wall.