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RISS 인기검색어
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- 저자 : 문광암(Moon Kwang-am) (검색결과 2 건)
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공기식 태양광/열 집열기 내 공기층에서 비균일 단면을 갖는 돌출부 설치 조건에 따른 전열 성능에 관한 분석
문광암(Moon Kwang-Am),최휘웅(Choi Hwi-Ung),김영복(Kim Young-Bok),손창효(Son Chang-Hyo),윤정인(Yoon Jung-In),최광환(Choi Kwang-Hwan) 한국태양에너지학회 2021 한국태양에너지학회 논문집 Vol.41 No.1
Air-type photovoltaic/thermal (PV/T) collectors attached to ducts beneath the solar panels are devices that can recover heat while the panel cools. By contrast, water-type PV/T is easily used because the air of an air-type PV/T has a lower heat capacity than water. A number of studies have been conducted on the installation of ribs as a way to increase the heat recovery capacity of air through ducts. In this study, a protrusion with a non-uniform cross-section was selected to increase the contact area of the air side as well as to promote turbulence. A computational fluid dynamics (CFD) analysis was conducted to confirm the heat transfer performance and the characteristics of the pressure drop according to different shape conditions. As a result, the heat transfer performance was improved by 1.3- to 1.9-fold depending on the conditions of the protrusion installation. However, the pressure drops also increased from 2.534- to 4.685-fold. It is therefore necessary to identify those factors of the thermal hydraulic performance that consider both the heat transfer and pressure drop. As a result, the maximum heat-recoverable shape condition achieved the largest performance coefficient value of 1.24 when e/H = 0.16, P/e = 20, and Wp/e = 5.
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삼각저항체가 설치된 태양열 공기-물 가열기의 풍량 및 유량에 따른 집열 성능 평가
이인한(Lee In-han),문광암(Moon Kwang-am),최휘웅(Choi Hwi-ung),최광환(Choi Kwang-hwan) 한국태양에너지학회 2022 한국태양에너지학회 논문집 Vol.42 No.6
Approximately 40% of the domestic building load is used for heating and cooling, and fossil fuels are commonly used to produce heat. To lower the proportion of fossil fuels, policy subsidies for the use of new and renewable energy facilities are being activated. Among them, solar thermal systems can contribute to reducing the heating load of buildings, including hot water supply and space heating. The production of thermal energy in this solar thermal system takes place in a collector, and the heat collection system is generally categorized into an air-type solar collector, which can heat only air, and a water-type solar collector, which can heat only water. In contrast, a solar air-water heater is a collector that can heat air and water simultaneously and can be applied to both hot water supply and space heating, occupying the same area. This system can also improve solar energy utilization by retrieving waste heat at the top of the absorber plate. In this system, the increase in thermal efficiency of the air side results in an improvement in the total efficiency of the collector as well as the air heating performance. Furthermore, the performance of the solar air-water heater is affected by air and water mass flow rates. Thus, in this study, a novel type of solar air-water heater with a triangle obstacle was fabricated, and the thermal performance of this system was experimentally evaluated using various air and water mass flow rates when air and water were heated simultaneously. We observed that a higher air and water mass flow rate can lead to higher thermal performance of the suggested system.
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