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단일 진공관형 집열기를 이용한 흡수식 냉방 시스템 실증연구
주홍진,이호,신우철,곽희영 대한건축학회지회연합회 2007 대한건축학회지회연합회 학술발표대회논문집 Vol.2007 No.1
This paper presents demonstration study results derived through field testing of a part load solar energized cooling system for the library of a cultural center building located in Gwangju, Korea. The area of demanded cooling for building was about 350m2. Solar hot water was delivered by means of a 200m2 array of evacuated tubular solar collector (ETSC) to drive a single-effect (LiBr/H2O) absorption chiller of 35kW nominal cooling capacity. During the demonstration tests, operating conditions of the solar cooling system are established through modifications of the various control parameters. Operation data for 10stable hours at a clear sky day during the summer season are achieved and analyzed for the verification of the availability, stability, and reliability of the present system.
중공사막 진공 막증류 모듈의 하우징 누수가 담수생산에 미치는 영향 분석
주홍진,곽희열 대한상하수도학회 2016 상하수도학회지 Vol.30 No.3
In this study, the performance experiment was conducted to compare the permeate flux of hollow fiber Vacuum Membrane Distillation module according to leak problem between module housing and membrane bundle. For the permeate flux performance experiment of the two Vacuum Membrane Distillation modules, the Lab-scale experimental equipment was built in the capacity of 1㎥/day. The performance test of the two Vacuum Membrane Distillation modules were analyzed according to the feed water conditions. As a result, it was analyzed that the leak VMD module decreased about 14% of permeate flux than normal VMD module.
PVDF 중공사막을 이용한 진공 막 증류 모듈의 공급수 조건에 따른 열성능 특성에 관한 실험적 연구
주홍진,곽희열 대한상하수도학회 2017 상하수도학회지 Vol.31 No.4
In this study, thermal performance test of VMD module was performed, prior to the construction of the demonstration plant using the vacuum membrane distillation (VMD) module of the capacity of 400 m3/day and to the commercialization of the VMD module. For the thermal performance test, the experimental equipment of capacity of 2 m3/day was constructed. The permeate flux test and thermal performance test according to feed water conditions such as temperature and flow rate were conducted. The VMD module used in the study was manufactured by ECONITY Co., LTD with PVDF hollow fiber membrane. As a result, the Performance Ratio (PR) of the VMD module showed the maximum value of 0.904 under the condition of feed water temperature of 75℃ and flow rate of 8 m3/h. PR value of the VMD module using PVDF hollow fiber membrane showed linearly increasing relationship with feed water temperature and flow rate. Also, The permeate flux of the VMD module was analyzed to have maximum value of 18.25 LMH and the salt rejection was 99.99%.
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.
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.
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.