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외기온도 변화에 대한 공기식 태양열 집열기의 열성능 신뢰성 검토 연구
김유진(Kim Yu Jin),왕은석(Wang Eun Seok),이범준(Lee Beom Joon),신형기(Shin Hyung Ki),이의준(Lee Euy Joon),강은철(Kang Eun Chul) 한국태양에너지학회 2021 한국태양에너지학회 논문집 Vol.41 No.3
Solar air collector is a technology that uses the solar radiation heat energy as a heat source for the ventilation and heating of buildings to reduce energy consumption. According to ISO 9806 solar air collector thermal performance evaluation, an indoor performance evaluation method uses a solar radiation simulator in indoor chambers, and an outdoor performance evaluation method uses natural solar radiation in outdoors. The thermal performance evaluation has to ensure the reliability of the thermal performance of the collector using the outdoor performance evaluation method that is affected by the changes in the seasonal outside air temperature. This study compared and analyzed the thermal performance of the glazed solar air collector depending on ambient temperature variations in February, March, and April. The average outside air temperature was -0.5°C in February, 13.4°C in March, and 21.1°C in April. The experiment indicated that the solar air collector thermal performance was 68.1% in February, 68.5% in March, and 63.8% in April and the temperature difference between the inlet and outlet with 1000 W/m² condition was 29.2°C in February, 27.5°C in March, and 29.0°C in April. These results indicated that seasonal ambient temperature variations had a small effect on the solar air collector thermal performance evaluation. Therefore, the result of the outdoor solar air collector thermal performance evaluation was reliable irrespective of the seasonal ambient temperature changes.
손성필(Seong Pil Son),김성민(Seong Min Kim),김지성(Ji Sung Kim),왕은석(Eun Seok Wang),박상준(Sang Jun Park),우성민(Sung Min Woo),김인관(In Gwan Kim),김민수(Min Soo Kim),박찬우(Chan Woo Park) 대한설비공학회 2018 설비공학 논문집 Vol.30 No.6
In this study, the basic performance characteristics of a falling film type absorber for use in an absorption chiller were investigated. In order to improve the performance of the absorber, newly-designed heating pipes were tested. End Cross 38, End Cross 40, End Cross 26-2 V, End Dimple, and NF tubes were tested, as well as conventional tubes (Floral tube and End Cross 26 tube). If the falling film absorber is theoretically divided into an upper part that covers the top 35%, a middle part that covers the middle 35% below the upper part, and a lower part that covers the bottom 30%, a high heat transfer and vapor absorption process occurs in the upper region, with successively lower heat transfer and vapor absorption processes in the middle and lower parts. In the case of a low liquid film flow rate of less than 20 liquid film Re, the EC 26 tube has a high overall heat transfer coefficient, and at high liquid film flow rates of 20 to 30 liquid film Re, which are the operating conditions of actual absorption refrigerator commercial equipment, the EC 40 tube has the highest overall heat transfer coefficient. It was also found that the EC 2 V heat transfer tube has a high overall heat transfer coefficient. Finally, it was found that the Floral tube had a generally low heat transfer coefficient.
흡착식 냉동기용 반만액식 증발기의 성능 특성에 관한 연구
유진호(Jin-Ho Yoo),김병련(Byung-Lyun Kim),왕은석(Eun-Seok Wang),권오경(Oh-Kyung Kwon),박찬우(Chan-Woo Park) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
The objectives of this paper are to measure the heat transfer of the heat transfer tube for an evaporator of absorption and adsorption system applications. two types of heat transfer tubes with different shape and heat transfer area are tested in the present experiment. heat transfer performance of heat transfer tubes are measured in various operating conditions, and compared each other.