Research On Performance Improvement And Application Of Permeable Solar Wall

As a kind of high-efficiency,energy-saving,and low-cost photothermal utilization technology,Unglazed Transpired Collector is increasingly used in various buildings.In this thesis,three researches are carried out on the UTC using the slotted collector plate,including the optimization of the parameter combination of the collector plate,the test of the thermal performance of the collector and the design of the system application.The purpose is to improve the heat transfer performance of this type of UTC heat collector plate,the operating performance of this type of UTC heating and air supply system,and promote the popularization and application of this type of UTC.The physical model when the UTC system is combined with the building has been established,the structure and working principle of the UTC system have been analyzed;the mathematical model of the UTC system has been established;the energy balance equations of the collector plates,cavities,and enclosure walls have been Listed separately.The air flow resistance in the heat exchange process has also been analyzed.The heat transfer of the collector plate within a single hole is used to represent the heat transfer of the entire collector plate,a computational domain model within the scope of a single hole is established,and its governing equations and boundary conditions are listed.The qualitative working conditions used for performance evaluation were put forward.Through orthogonal experimental design and CFD simulation,the heat transfer performance of the heat collector plate is obtained by the six parameters of the net height of the hole,the net width of the hole,the net distance of the hole,the length of the convex plate,the thickness of the plate,and the material of the plate.The order of influence.At the same time,the optimal parameter combination of the collector plate is screened out,which improves the heat transfer performance of the collector plate.An experimental platform was built to determine the performance level of UTC with the best combination of parameters under qualitative working conditions.The temperature distribution characteristics of its outlet,cavity,and the inner and outer surfaces of the collector plate have also been analyzed.According to the experimental results under different working conditions,the influence of three variables of ambient air temperature,radiation intensity and air volume per unit area on the thermal performance of UTC has been analyzed.The regression analysis method is used to derive the UTC supply air temperature prediction equation related to the above three variables.According to the supply air temperature prediction equation,the total installation area estimation strategy and system operation control strategy of UTC heating and air supply system related to building size,heating and ventilation requirements and meteorological conditions are proposed.This improves the operating performance of the heating and air supply system.Taking a single-storey industrial plant as an example,a full set of application schemes for UTC heating and air supply systems using optimal parameter combination of collector panels are proposed,which provides a reference for the application of UTC in other engineering projects.