건물에너지 절감을 위한 복사냉난방 복합형 광선반 시스템 개발

Abstract

This study was developed the TALS(Thermally Activated Light Shelf) and verified performance of the indoor light environment, thermal environment and energy saving. For performance verification, test bed experiments and simulations were conducted. The results of TALS light environment evaluation are as follows. TALS is installed in the perimeter zone of the indoor to block direct sunlight, create comfortable light environment by making the uniformity of indoor illuminance distribution through reflecting the sunlight into the interior zone. Also, TALS has a discomfort glare control effect by reducing the window luminance and maintains a bright indoor by improving the indoor daylight factor. Therefore, it has been proven that TALS can improve the light environment and create a visually comfort indoor environment by performing the original function of the light shelf. The results of TALS thermal environment evaluation are as follows. TALS reduces heat transfer and maintains a stable indoor temperature by transferring radiant cooling and heating in the perimeter zone which occurs a lot of heat gain and heat loss. The result of the vertical temperature difference and discomfort ratio at the center of the indoor were analyzed that the comfortable range was improved and could feel a comfort thermal environment. In addition, it was shown that the horizontal temperature deviation was reduced by installing TALS to create a uniform temperature throughout the room. PMV was analyzed to increase Category A comfort range by about 3.7 times when TALS was applied. The building energy saving effects are as follows. The energy saving of TALS was analyzed with DRDS(Daylight Responsive Dimming System). When DRDS was applied, lighting energy was reduced by 73.2 %, and when TALS and DRDS were applied, lighting energy was reduced by 78.8 %. Lighting energy saving rate of TALS was 5.6 %, and it was confirmed that the amount of lighting energy savings increased under the conditions of the clear sky and partly overcast sky, but decreased in the overcast sky. Also, TALS can reduce air conditioning load that the heating energy saving rate was 39.38 % and the cooling energy saving rate was 7.86 %. Radiant heating and cooling technology of TALS has proven to be very effective in saving building energy by decreasing the perimeter zone load and improving the indoor thermal environments. In this study, TALS was developed and verified performance. TALS is a crucial building equipment for realization of eco-friendly buildings and zero-energy buildings. and it has secured the original technology in the field of building environment. This study was proposed the operating mechanism of the TALS was quantitatively investigated such as the effect of thermal comfort, the heating and cooling energy saving, the light environment, and reducing lighting energy consumption. It is possible to present basic data for TALS application and operation, it is possible to propose technical standards and expand technology for radiant cooling and heating light shelf. Lastly, it is possible to meet the national energy conservation policy and the achievement of the global greenhouse gas emission reduction target. Furthermore, it is possible to expand related industries and upgrade in the field of building environment.