Research On Shading Energy-saving Calculation And On Influence Of Shade On Natural Ventilation

In summer, solar heat gain is the main source of room cooling load. How to reduce this part of heat gain through windows is the important and difficult point of the building energy efficiency work. The design of sun shade is a key part of architectural design, and it is of significance in reducing the building energy—saving, improving indoor light environment and indoor thermal comfort. This paper makes researches on sun shade about how to evaluate energy—saving effect of shade, and the influence of shade on natural ventilation.This paper summarizes the relative research work and does some jobs as follow:1. The application and development of domestic and international status of shade is introduced from practical and theoretical aspects. And indexes which are being put into practice of envaluation of shade are introduced and their problems are discussed too.2. Building shading system is elaborated, which includes the classification and applicability of shade. From the perspective of shade design, key point and steps of shade design is also analyzed. According to the calculation relationship of shade and sun, model of solar heat gain of shade and window are established.3. On the basis of SHGC, solar heat gain coefficient, a new evaluating index—SESC,shading energy—saving coefficient is proposed and introduced in details of its calculation. This index takes the direct radiation, scattering radiation and reflecting radiation on the effect of shading into account. Its calculation is more simple so it is of a certain practical significance.4. In order to make the solar heat gain coefficient more operational coefficient, an auxiliary energy calculation program - SE (Shade Efficiency) based on Visual c++ computer language is created in this thesis.5. The energy consumption of a office building in Chongqing is simulated and calculated through using DeST simulation software, and its results is compared with SESC in order to check and prove the correctness of calculations and procedures of SESC calculation.6. The influence of shade on indoor natural ventilation is studied and analyzed by CFD fluid simulation software in an office modelThrough solving of those problems mentioned above, some helpful advices for performing of the design standard for building energy efficiency and calculate effects of building consumption as well as influence of indoor natural ventilation are offered by this article.