A Study on the Simulation Result of Horizontal Shading Installation for Passive Cooling of Building South KOREA

Seok-Hyun Kim,Young-Hum Cho,Soo Cho,S.I Tanabe,H Zhang,C Inard,L Mazzarela,M.C Gameiro Da Silva,I Nastase,J Kurnitski,G Cao,P Wargocki

doi:10.1051/e3sconf/201911106052

Abstract

In South Korea, the evaluation criteria for the shading devices installation are defined by regulations, but the standards of design methods are not clearly established. The installation of shading device is used to solar control in building. It has become mandatory for some public buildings due to revised regulations. Generally this device mean is horizontal shading at upper window. Therefore, a design of horizontal shading device which takes into account the energy consumption of the building is required, and indoor environmental problems which may occur due to the installation of them should also be taken into consideration. This research studied to propose a design which takes into account the energy consumption which may occur if the horizontal shading device is installed, and suggest an improved design method of horizontal shading devices on the basis of the analysis of the problems that may occur when they are installed. Consequently, it was confirmed that as the length of the horizontal shading device becomes longer, the incoming daylight is reduced and the indoor intensity of illumination becomes lower, and thus, more lighting energy may be consumed in a room where the shading device is installed than in the one where it is not. Therefore, annual energy consumption was calculated by applying the lighting control and it was found that the total energy consumption decreased as a result of the reduction in energy consumption for air conditioning and fans and further decrease in lighting energy consumption.

Highlights

In South Korea, Recently, the insulation performance of windows has become more important because the area of the window at the building envelope was increased
This study analysed and compared the indoor energy consumption according to the performance of windows installed on the outer walls of office buildings and analysed the indoor energy consumption concerning the installation of the horizontal shading device, one of the shading devices which are currently installed mandatorily
By these results of analysis, this paper proposed an elementary chart of design of horizontal shading device installation

Summary

Introduction

In South Korea, Recently, the insulation performance of windows has become more important because the area of the window at the building envelope was increased. The calculated figure of the protruding length of each horizontal shading device was applied, the indoor energy consumption was calculated by means of simulation, and the results were analysed. In order to meet the legal criteria, it is necessary to install the horizontal shading device whose solar heat gain coefficient is 0.6 (the value calculated using the formula and table presented in the Energy Performance Index) over south facing and west facing windows. The same results were obtained for west and south windows, and the installation of the horizontal shading device blocked the incoming solar radiation which increased the cooling load of the room and made it possible to get the Energy Performance Index scores. In case of south window, the energy-saving ratio was increasing by 1∼13%

Objectives

Conclusion