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여름철 통풍시의 아파트 실내 온열환경에 대한 기초적 연구
장현재(Chang Hyun-Jae) 한국건축친환경설비학회 2008 한국건축친환경설비학회 논문집 Vol.2 No.1
Wind driven ventilation has been used actually to endure high temperature and high humidity in summer, in Korea. If it is insufficient to cool indoor area only with wind driven ventilation, it is hard to sleep in night time and air conditioner has been used. It is considered that weight structure of reinforced concrete, which is usually used for apartment housing in Korea, affect indoor thermal environment in day time and in night time. In this study, indoor thermal environment in an apartment house was measured to understand thermal specificities in summer. As a results, surface temperatures of furniture, ceiling, floor, wall have a small band of temperature change than a band of indoor air temperature change.
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대한민국 표준기상자료를 이용한 열해석 방식별 냉난방 부하
유호천(Yoo Ho-Chun),강현구(Kang Hyun-Gu) 대한건축학회 2011 대한건축학회논문집 Vol.27 No.2
Each simulation program has its own thermal analysis equation which produces different analysis result, respectively. Simulation analysis requires a large volume of data and is complex, but calculation and analysis of the theoretical background and the outcome are somewhat difficult. This study is intended to evaluate and compare the cooling/heating load calculated using theoretical equation and using IES/VE, a simulation program, as well as aimed at evaluating the effect of storage heat on time delay through the thermal analysis under normal condition and abnormal condition. Consequently, heating load appeared to be similar, but when it comes to cooling load, it appeared to be similar also but the value obtained from CLTD/CLF/SCL was the highest while the value from IES/VE was the lowest, which was attributable to applying relatively higher value because of lack of incorporation of heat storage effect of the structure, despite of applying CLTD value using CLTD/CLF/SCL as similar structure. Such factor appeared to have increased the hourly value of energy acquisition and loss as well as yearly accumulative total acquisition and loss.
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김성은(Seong Eun Kim),최성호(Seong Ho Choi),박진철(Jin Chul Park) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.11
This study is a basic step for developing a floor heating system using phase change material(PCM) with the high thermal performance, and aims to analyze the thermal performance of PCM floor heating system through a Mock-up test. The Mock-up Room was consisted of two rooms, each with the existing hot water floor heating system (Room1) and PCM floor heating system (Room2). And the temperature changes of the two rooms were compared after the boiler shutdown. The result of the test, room1 took 230 minutes for the floor surface temperature to drop from 35 ℃ to 30 ℃, while room2 took 570 minutes. In other words, the time-lag of room 2 was about 2.5 times longer due to the thermal storage effect of PCM.. The floor surface temperature was 1.6 ℃ to 4.6 ℃ higher than room1 in room2. And when the four-hour boiler on-off schedule was applied repeatedly, the floor surface temperature of room 2 was higher than room 1 and the maximum difference was 1.5 degrees. Also, the room temperature difference was 0.1 degrees. This means that room 2 has a higher floor surface temperature under the same indoor temperature conditions. This study is a basic performance review for PCM for future research, and further studies will be conducted on the proper application location of PCM and the schedule of heating operation, energy saving and the improvement of indoor comfort through the expected mean temperature reduction (PMV).
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난방 스케줄에 따른 PCM 바닥복사난방 시스템의 축열효과 분석
김성은(Seong Eun Kim),최성호(Seong Ho Choi),박진철(Jin Chul Park) 대한설비공학회 2020 설비공학 논문집 Vol.32 No.6
The purpose of this study was to compare the thermal performance of the floor heating system using PCM with the general system when the heating operation schedule is applied, and to provide basic data to improve the applicability and comfort of the PCM. To achieve this, the boiler was operated on and off (run-30 minutes, stop -four hours, five hours) and the indoor air and floor surface temperature changes during the non-operation time were checked. Room 1 has a general floor heating system and Room 2 has an additional PCM installed. The result can be summarized as follow. The floor surface temperature was 1.05℃ higher in Room 2 (PCM) than Room 1 (normal), and the room air temperature was 0.25℃ higher in Room 2 (PCM). Additionally, the time-lag that indicates the heat storage performance was calculated as the time recorded for the floor surface temperature to drop 1℃ from the highest temperature. In the room where the PCM was installed (Room 2), the temperature delay (average 22.5 minutes) occurred.
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