Study on Heat Transfer Performance of a Novel Adjustable Film Shading System
The window of the building is the weakest part of the thermal performance of the building envelope,and the traditional static optimization has improved its performance to a higher level.Therefore,the use of adjustable shading components is one of the most effective ways to improve the performance of the window at present.Based on the principle of shading in summer and thermal insulation in winter,and with the traditional shading roller shutter as the research subject,this paper designed a novel adjustable film shading system realizing both shading and thermal insulation.The heat transfer process was verified and analyzed by experimental tests and numerical simulation.Then,the influence of two main factors,cavity thickness D and sunshade area ratio SAR,on its thermal insulation performance was studied.The experimental results show that with the existence of heat flow in the vertical direction,SAR has a nonlinear inverse relationship with the system heat transfer coefficient.When D is smaller than 20 mm,the heat transfer coefficient of the system will be significantly affected because the cavity is mainly thermally conductive.The nonlinear fitting of the two main influencing factors further shows that when D is 112 mm,the novel adjustable film shading system can achieve the change of heat transfer coefficient from 1.764 to 2.467 W/(m2·K),and achieve the optimization of its thermal insulation and adjustable performance under the glass configuration.
adjustable filmshading systemheat transfer processthermal performance
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