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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.
SUS - 물을 사용한 2상 밀폐 열싸이폰의 작동특성에 관한 연구
곽희열(Kwak Hee-Youl),김종보(Kim Chong-Bo) 한국태양에너지학회 1994 한국태양에너지학회 논문집 Vol.14 No.3
2상 밀폐 열싸이폰은 용기 내에서 증발과 응축을 반복하면서 많은 양의 열을 수송하는 매우 효과적인 열전달 장치이다. 증발부에서의 증발 현상은 자연대류, 핵비등, 급속한 기포의 주기적인 폭발(Geyser boiling)과 또한 정상상태에서의 국부적인 열전달한계(Dry-out)로 인한 시동 및 작동특성이 매우 복잡하므로, 본 논문에서는 SUS-물을 사용한 열싸이폰의 시동성과 작동 특성을 증발부와 응축부의 열 환경에 따른 액체 풀(Pool)의 높이, 즉 증발부 체적에 대한 작동유체의 충전량과 경사각에 따른 특성을 고찰하였다. The two-phase closed thermosyphon is a heat transfer device capable of transferring large quantities of heat from a source to a sink by taking advantage of the high heat transfer rate associated with the evaporation and condensation of a working fluid within the device. The boiling patterns in the evaporator of thermosyphons are very complicated, considering natural convection in pool, surface evaporation on film, intermittent periodical geyser boiling, and semi-stable froth boiling. Also, heat transfer limit was found in dry-out where some portion of the evaporator ceases to be cooled effectively by the falling film and rivulets, resulting in a wall temperature excursion. In the present investigation, ex periments with a SUS-Water thermosyphon with 1m in length and 19㎜ in outer diameter have been carried out. The unsteady and steady state operations have been investigated for the influence of liquid filling charges and inclination angles of the device.
곽희열(Kwak Hee-Youl),김정배(Kim Jeongbae),신우철(Shin U-Cheul),김진희(Kim Jin-Hee),주홍진(Joo Hong-Jin) 한국태양에너지학회 2006 한국태양에너지학회 학술대회논문집 Vol.- No.-
This study describes heating 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 ETSC, storage tank, hot water supply tank, subsidiary boiler, and subsidiary tank.<br/> When evaluated the results obtained at January of winter season, 40% of required total energy used as hot water supply and 26% for space heating was supplied from the ETSC system and the rest, 34 %, was fulfilled by the subsidiary boiler. Here, the solar energy was mainly used for space heating, then if the surplus energy was being, the rest of solar energy was used as the hot water supply. 20% of hot water supply energy used in that building was supplied by the solar system.
곽희열(Kwak, Hee-Youl),주홍진(Joo, Hong-Jin) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06
This study was carried out to evaluate the clear day operating performances for the decentralized desalination system with the solar thermal system and the photovoltaic power system. In a clear day, we used a solar thermal system as heat source of the single-stage fresh water generator with plate-type heat exchangers and a photovoltaic power system as electric source for hydraulic pumps. The demonstration system generation was designed and installed at Jeju-island in 2006. The system was comprised of the desalination unit with daily fresh water capacity designed as 2m³, a 120m³ evacuated tubular solar collector to supply the heat, a 6m³ heat storage tank, and a 5.2kW photovoltaic power generation to supply the electricity of hydraulic pumps for the heat medium fluids. In a clear day, solar irradiance daily averaged was measured 518W/m³, the daily fresh water yield showed that about 565 liter.
곽희열(Kwak, Hee-Youl),주홍진(Joo, Hong-Jin) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06
The Purpose of this study was thermal performance of solar hot water and space heating thermal storage tank. The combi storage tank was designed Tank in Tank type. The tank volume for space heating was 700 ell and tank volume for hot water was 150 ell . Tank in Tank type storage tank was to replace heat exchange to hot water tank. The result showed that the Heating value was 67.25MJ and domestic hot water value was 51.93MJ. Supply to the hot water volume was 521 ell more than about 3 times as that of the hot water tank volume.
곽희열(Kwak Hee-Youl),주홍진(Joo Hong-Jin),주문창(Joo Moon-Chang),김정배(Kim Jung Bae) 한국태양에너지학회 2008 한국태양에너지학회 학술대회논문집 Vol.- No.-
This study was carry out evaluation of seasonal performance for the decentralized desalination system with the solar thermal system and tile photo voltaic power system. First operating demonstration system was set up in Cheju in 2006. These system comprises the desalination unit with designed daily fresh water capacity of 2 ㎡ and is supplied by a 120 ㎡ evacuated tubular solar collector, a 6㎡ heat storage tank, and a 5㎾ photovoltaic power generation supply the electricity for hydraulic pumps to move the working fluids. In a spring season day average 392W/ ㎡ the daily fresh water showed to produce about 340liter. In a summer season day average 296W /㎡, the daily fresh water showed to produce about 328liter. In a autumn season day average 349W/㎡, the daily fresh water showed to produce about 277liter. In a winter season day average 342W/㎡, the daily fresh water showed to produce about 271liter.