An Influence of Physical Appearance of Shading Devices to Shading Coefficient in Thailand

Abstract

Thailand has a tropical climate. Solar radiation in daytime can enter the building through the building fenestration causing too much light and heat. Most indoor users use air conditioners to reduce indoor temperatures, which is a waste of energy. Therefore, shading devices are important in reducing the solar radiation into the building for thermal comfort and load reduction of air conditioner. This research aims to study an influence of physical appearance of shading devices to reduce solar radiation into the building. Resulting in the Overall Thermal Transfer Value (OTTV) to decreased because the Shading Coefficient (SC) is one of the factors affecting the Overall Thermal Transfer Value (OTTV). By compiling standard windows size in Thailand, then choosing a window size 60×120 centimeters with shading device 90×150 centimeters as a test representative. Test 4 overhangs are 30, 60, 90 and 120 centimeters, 3 patterns are horizontal, vertical and combined shading devices. Then calculate the Shading Coefficient (SC) in 8 directions via SC Calculation plugin in SketchUp Pro 2019 software.

The test results showed that increasing the overhang of horizontal shading device is the most influential in the southwest, southeast and south, with the average Shading Coefficient (SC) is 0.696, 0.697, 0.790 respectively. Increasing the overhang of vertical shading device is the most influential in the southwest, southeast and south, with the average Shading Coefficient (SC) is 0.756, 0.757, 0.814 respectively. And increasing the overhang of combined shading device is the most influential in the south, southwest and southeast, with the average Shading Coefficient (SC) is 0.604, 0.638, 0.638 respectively.