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Calculation of Escaped Solar Energy in Glazing Facade Buildings

机译：玻璃幕墙建筑中逃逸太阳能的计算

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摘要

In building's cooling load calculation, solar heat gain through transparent envelope is calculated by using solar heat gain coefficient which is a thermal performance parameter of window. In traditional buildings, window-wall ratio is small so it's is assumed that the incoming solar radiation can't escape through the window again. But this hypothesis isn't suitable for glazing facade buildings. To calculate the escaped solar energy ratio, a solar radiation model is established on the basis of radiosity-irradiation method and calculated by using the commercial software of Matlab. The impact of time, room geometric dimensioning and absorptance of interior surfaces are evaluated. The numerical calculation results show that the escaped solar radiation ratio varies according to solar radiation incident angle in different times and its maximum value is 8.85% in summer solstice; compare to the width, the depth and height of the room affect the ratio significantly; the reflectance of the floor has greater impact on the escaped solar energy ratio than of other internal surfaces. Finally a fitting formula of escaped solar energy ratio is provided as a function of the ratio between the window area and the internal surface area and of the internal surfaces' absorptance.
机译：在建筑物的制冷负荷计算中，通过使用透明热封壳获得的太阳能热量是通过使用窗户的热性能参数即太阳能热量获取系数来计算的。在传统建筑中，窗户与墙壁的比例很小，因此可以假设入射的太阳辐射无法再次通过窗户逸出。但是这个假设不适用于给立面玻璃上光。为了计算逃逸的太阳能比，基于辐射度辐射方法建立了太阳辐射模型，并使用Matlab的商业软件进行了计算。评估了时间，房间几何尺寸和内表面吸收率的影响。数值计算结果表明，夏至时太阳逃逸率随太阳辐射入射角的变化而变化，夏至最大值为8.85％。与房间的宽度，深度和高度相比，对比率的影响显着;与其他内表面相比，地板的反射率对逸出太阳能比率的影响更大。最后，提供了逃逸太阳能比的拟合公式，该公式是窗口面积与内表面面积之比以及内表面吸收率的函数。

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  • 来源
    《Heat Transfer Engineering》 |2018年第20期|1636-1642|共7页
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  • 作者单位

    Tongji Univ Sch Mech Engn 1239 Siping Rd Shanghai 200092 Peoples R China;

    Tongji Univ Coll Architectural & Urban Planning Shanghai Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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