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태양열 시스템의 제어조건에 따른 난방 및 급탕 실증연구
주홍진(Hong-Jin Joo),곽희열(Hee-Youl Kwak),김정배(Jeongbae Kim),김종보(Jong-Bo Kim) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.6
This study describes thermal performance of heating and cooling demonstration system using ETSC(Evacuated tubular solar collector) installed at Seo-gu art center of Kwangju. For demonstration study, a reading room with about 331㎡ was heated and cooled using that system. The demonstration system was consisted of ETSCs, storage tank, hot water supply tank, subsidiary boiler, and subsidiary tank. From January to March in 2006, demonstration test were performed with 4 cotnrol mode to find the optimum control condition for solar thermal system. After experiments and analysis, this study found that solar thermal system of control mode Ⅳ was corresponded to 78% for the hot water supply and 49% for space heating.
태양광열 복합 모듈을 활용한 공기열원 히트펌프 실외기 가열 시스템 개발
주홍진(Joo Hong-Jin),안영섭(An Young-Sub),이경호(Lee Kyoung-Ho) 한국태양에너지학회 2023 한국태양에너지학회 논문집 Vol.43 No.6
In this study, a convergence technology that can be linked with photovoltaic thermal (PVT) modules was derived to increase the performance and efficiency of air source heat pumps that are currently most widely used as cooling, heating, and domestic hot water supply equipment in public buildings. The solar energy and air source heat pump convergence technology developed through this study was an indirect supply type outdoor unit heating system that supplied heat energy acquired through a PVT module by increasing the temperature of the air flowing into the outdoor unit when the heat pump heating mode was operating. A bench-scale test device was designed and manufactured to verify the performance of the outdoor unit heating system of an air source heat pump using a PVT module. The performance evaluation confirmed that the heating performance of the air source heat pump was improved compared with that of the conventional air source heat pump without the heating system under the same test conditions. In addition, the heating demonstration was performed by applying the air source heat pump outdoor unit heating system using a PVT module to the air source heat pump installed at the Seodaemun Fire Station Hongeun 119 Safety Center, where an actual public building was remodeled. Consequently, the air source heat pump was heated. The analysis revealed that COP increased by more than 0.5.
단일 진공관형 집열기 히트파이프 작동유체에 따른 열성능 연구
주홍진(Joo Hong-Jin),김정배(Kim Jeong-Bae),김종보(Kim Jong-Bo),곽희열(Kwak Hee-Youl) 한국태양에너지학회 2007 한국태양에너지학회 논문집 Vol.27 No.4
This study was carried out to compare the thermal performance and operating characteristics of evacuated tubular solar collector(ETSC) with different working fluid. The evacuated tubular solar collectors with different working fluid of heat pipe were investigated in the same operating condition for a indoor experiment equipment. First, the result of working fluid with Water showed that F R (Tα) was 0.6636 and F R U L was -1.8457. Second, Ethanol showed that F R(Tα) was 0.6147 and F R U L was -0.6365. Third, Flutec-pp9 showed that F R(Tα) was 0.515 and F R U L was -3.2313. Finally MA's showed that F R(Tα) was 0.6572 and F R U L was -2.0086.
주홍진 ( Hong Jin Joo ),유현주 ( Hyun Ju Yoo ),김정은 ( Jung Eun Kim ),강훈 ( Hoon Kang ) 대한피부과학회 2014 대한피부과학회지 Vol.52 No.12
Mucinous nevus is a rare entity classified as either cutaneous mucinosis or connective tissue nevi. Clinically, grouped papules or plaques grow to form a verrucous or nevoid feature usually on the trunk. It can be present since birth or early childhood. Histologically, it consists of mucin deposits localized in the superficial dermis with or without epidermal changes. An 18-year-old boy presented with asymptomatic multiple grouped brown papules and coalescent plaques on his lower back that had been present since birth. Histological examination showed a band-like mucin deposit in the papillary dermis. To our knowledge, there have been only few reports of mucinous nevus in the literature. Here, we report a case of mucinous nevus present since birth, including a review of relevant literature. (Korean J Dermatol 2014;52(12):892∼894)
주홍진(Hong-Jin Joo),양용우(Yong-Woo Yang),곽희열(Hee-Youl Kwak) 한국태양에너지학회 2014 한국태양에너지학회 논문집 Vol.34 No.5
This study was accomplished to get the foundation design data of VMD(Vacuum Membrane Distillation) system for Solar Thermal VMD plant. VMD experiment was designed to evaluate thermal performance of VMD using PVDF(polyvinylidene fluoride) hollow fiber hydrophobic membranes. The total membrane surface area in a VMD module is 5.3㎡. Experimental equipments to evaluate VMD system consists of various parts such as VMD module, heat exchanger, heater, storage tank, pump, flow meter, microfilter. The experimental conditions to evaluate VMD module were salt concentration, temperature, flow rate of feed sea water. Salt concentration of feed water were used by aqueous NaCl solutions of 25g/l, 35g/l and 45g/l concentration. As a result, increase in permeate flux of VMD module is due to the increasing feed water temperature and feed water flow rate. Also, decrease in permeate flux of VMD module is due to increasing salinity of feed water.VMD module required about 590 kWh/day of heating energy to produce 1㎥/day of fresh water.
수직 벽면형 태양열 온수급탕 시스템의 학교건물 적용을 위한 드레인백 시스템의 과열 및 동파방지 유용성 평가
주홍진(Joo, Hong-Jin),이경호(Lee, Kyoung-Ho),안영섭(An, Young-Sub),이왕제(Lee, Wang-Je) 한국건축친환경설비학회 2021 한국건축친환경설비학회 논문집 Vol.15 No.3
In this study, a drain back system to prevent summer season overheating and winter season freezing of facade installed solar hot water system for school building was suggested and evaluated by long-term experiments. The drain back system proposed in this study was configured as a system with a control valve to modulate the amount of drained water when drain-back is called. The controller of the drain-back system allows the user to set the set point temperature and control whether to remain or discharge the working fluid inside the piping of the solar hot water system. In addition, the piping system was constructed so that a part of the working fluid pump power recovered by installing a micro hydro turbine with a capacity of 10 W at the end of the return pipe of the solar hot water system. In order to experimentally evaluate the reliability and usefulness of the drain back system to prevent overheating and freezing, long-term demonstration experiments were carried out to use tap water that is vulnerable to freezing and overheating as a working fluid. As a result of long-term experiments, the temperature inside the heat storage tank could be kept below the setting temperature of 68℃ in the summer season. Also, the freezing problem of the solar hot water system did not occur at all even when the outside temperature was continuously below -10℃ in the winter season.