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곽희열(Kwak Hee-Youl),신우철(Shin U-Cheul) 한국태양에너지학회 2008 한국태양에너지학회 논문집 Vol.28 No.4
The purpose of this study is to present the simulation results and an overview of the performance assessment of a solar heating & cooling system by means of the 200㎡ evacuated tube solar collector. The simulation was carried out using the thermal simulation code TRNSYS with new model of a single-effect LiBr/H₂O absorption chiller developed by this study. The calculation was performed for yearly long-term thermal performance and for two design factors: the solar hot water storage tank and the cold water storage tank. As a result, it was anticipated that the yearly mean system efficiency is 46.7% and the solar fraction for the heating, cooling and hot water supply are about 84.4 %, 41.7% and 72.4%, respectively.
곽희열(Kwak Hee-Youl),주홍진(Joo Hong-Jin),이호(Lee Ho) 한국태양에너지학회 2009 한국태양에너지학회 학술대회논문집 Vol.- No.-
This paper presents demonstration study results derived through field testing of a solar assisted cooling and heating system for the library of a cultural center building located in Gwangju, Korea. The area of demanded cooling and heating for building was about 350㎡. Solar hot water was delivered by means of a 200㎡ array of evacuated tubular solar collector (ETSC) to drive a single-effect (LiBr/H2O) absorption chiller of 10RT nominal cooling capacity. From March in 2008 to February in 2009, demonstration test were performed for solar cooling and heating system. After experiments and analysis, this study found that solar thermal system was 84% for the solar hot water supply and 12% for space heating and 4% for space cooling.
태양열 집열기용 히트파이프 응축부 형상 변화에 따른 열성능 연구
곽희열(Kwak Hee-Youl),주홍진(Joo Hong-Jin) 한국태양에너지학회 2008 한국태양에너지학회 논문집 Vol.28 No.2
The purpose of this study was experimentally to investigate thermal performance of heat pipe for evacuated tubular solar collector. Two sets of evacuated tubular solar collector with different condenser shape of heat pipe were prepared. The experiments were performed under the same operating condition with an indoor testing apparatus. Also, the experiments were carried out various testing conditions including inclination, flow rate, and incident heat flux. The results of thermal performance of collector with enlarged condenser showed that FR(τα) was 0.6572 and FR UL was -2.0086 at 40°. And the results of thermal performance of collector with straight condenser showed that FR(τα) was 0.6233 and FRUL was -1.4996 at the same inclined angle.
곽희열(Kwak Hee-Youl),주홍진(Joo Hong-Jin) 한국태양에너지학회 2007 한국태양에너지학회 학술대회논문집 Vol.- No.-
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 350㎡ 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. The results of the experimental study From January to February in 2007, The solar fraction were 58% for solar heating, 30% for solar hot water in January and 79% for solar heating, 33% for solar hot water in February.
곽희열(Kwak hee-youl),김정배(Kim jung-bae),윤응상(Yoon eung-sang-Yang),주문창(Joo moon-chang) 한국태양에너지학회 2006 한국태양에너지학회 학술대회논문집 Vol.- No.-
A third of people in the world based on UN environmental report have suffered with the water lack and KOREA is also known as one of the countries with water lack problem. As reported in the running report of domestic management for sea water desalination system, there are some problems including the operation by town manager without professional knowledge, out of order of membrane for pre-filtering of sea water, and difficult repairs of RO components and high pressure pumps to operate. 29 systems of all 40 sea water desalination systems installed have normally operated in Korea. In general, the process of fresh water generation using sea water needs large energy, so to reduce the required energy is so important. In this research, the hot water using evacuated tubular solar collector would supply as heating medium for sea water needed to be evaporated and the PV system would supply the electricity to move the working fluids. The desalination system with solar energy is integrating the solar collector, photovoltaic system, and evaporation type of fresh water generator. The installed solar collector area for heating medium was about 120 square meters and PV system was 5㎾ as the total electric requirement. The fresh water generation capacity of the trial product is about 2 ton/day. To achieve that object, this study set up the demo-plant, then estimate and analyze the usefulness, the safety, the reliability and the economical effectiveness.