화학공학소재연구정보센터
Energy and Buildings, Vol.172, 159-169, 2018
A mathematical model for calculating total transmission of solar radiation through shuttle louvers and experimental verification
The main problem of previous methods for the calculation of total transmission of solar radiation through shading louvers is that they can only deal with flat slats and pure diffuse reflection. Taking the radian and specular reflection of louvers into consideration, a new model of total solar radiation transmitted through shuttle louvers was established and experimentally verified in this paper. Firstly, taking two adjacent shuttle louvers as the object of study, the new calculation model was established, and a computer program based on the model was developed in MATLAB, which can be used to study the impact of shape, size, rotation angle, and surface optical properties of shuttle louvers on the transmission of direct and diffuse radiation. Secondly, an experimental set-up equipped with integrating sphere was built and experiments were performed to verify the new model, with the results showing that the model predictions compared well with the experimental data. Finally, the calculation errors of two conventional methods, the "flat slat model" and the "pure diffuse reflection model", were analyzed, and the results showed that the "flat slat model" can cause considerable error and the relative error increases with the rotation angle of the louvers, and the "pure diffuse reflection model" gives overestimated results when the rotation angle is positive and underestimated results when the rotation angle is negative. (C) 2018 Elsevier B.V. All rights reserved.