• Proceedings of the SAREK Conference
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• 2006.06a
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• pp.105-110
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• 2006

Several types of solar water heating system were analyzed in characteristics and proper systems were proposed under Korean climates. In particular, the forced circulation type with a spiral-jacketed storage tank has a potential to be used widely in a small and a part of middle systems when the stratification of the storage tank can be enhanced by a precise design.

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.10 no.4
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• pp.350-358
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• 1981

최근 태양열을 이용한 가정용 온수급탕 System에 사용되는 Computer Program은 3종류가 있으나, 이에 대한 타당성을 조사하기 위해 미국 국립표준연구소(National Bureau of 을Standards)에서는 Gaithersburg 병원분지에 6가지의 독창적인 System을 고안, 설치하여 1978년 6월부터 필요한 Data를 얻어왔다. 여기서는 실험장치 및 실험결과를 수록하고, 처음 12개월 동안 실험한 결과를 Computer의 예견과 비교하였다. 본 내용은 1980년 ASHRAE의 LA. Semiannual Meeting의 Sols Hot Water Systems의 심포지움에 발표되었으며, Transactions. Vol. 86, Part 1.에 게재되었다.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.28 no.9
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• pp.355-360
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• 2016

Continuing to the modeling of heating load, this paper, as the second part of consecutive works, presents LS-SVM (least square support vector machine) based model of winter time apartment hot water supply load in a district heating system, so as to be used in prediction of heating energy usage. Similar, but more severely, to heating load, hot water supply load varies in highly nonlinear manner. Such nonlinearity makes analytical model of it hardly exist in the literatures. LS-SVM is known as a good modeling tool for the system, especially for the nonlinear system depended by many independent factors. We collect 26,208 data of hot water supply load over a 13-week period in winter time, from 12 heat exchangers in seven different apartments. Then part of the collected data were used to construct LS-SVM based model and the rest of those were used to test the formed model accuracy. In modeling, we first constructed the model of district heating system's hot water supply load, using the unit heating area's hot water supply load of seven apartments. Such model will be used to estimate the total hot water supply load of which the district heating system needs to provide. Then the individual apartment hot water supply load model is also formed, which can be used to predict and to control the energy consumption of the individual apartment. The results obtained show that the total hot water supply load, which will be provided by the district heating system in winter time, can be predicted within 10% in MAPE (mean absolute percentage error). Also the individual apartment models can predict the individual apartment energy consumption for hot water supply load within 10% ~ 20% in MAPE.

• Solar Energy
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• v.15 no.2
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• pp.3-11
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• 1995

This paper reports the performance of solar domestic hot water systems manufactured with heat pipes. A series of tests were conducted on a number of systems to elicit the most suitable configuration of the system for possible commercialization in Korea. The heat pipe is made with a copper tube and the respective length of the evaporator, adiabatic, and condenser sections are 1700mm, 100mm and 200mm. The evaportor section is finned with a copper plate to increase solar input for its proper operation as a heat pipe. Results show quite an interesting performance data stemming from the difference in working fluids, presence of wick, and other various design parameters associated with the collection and utilization of solar energy.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.37 no.4
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• pp.331-341
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• 2013

In a solar domestic hot water (SDHW) system, solar energy is collected using collector panels, transferred to a circulating heat transfer fluid (brine), and eventually stored in a thermal storage tank (TST) as hot water. In this study, a computational fluid dynamics (CFD) model was developed to predict the solar thermal energy storage in a hybrid-type TST equipped with a helical jacket heater (mantle heat exchanger) and an immersed spiral coil heater. The helical jacket heater, which is the brine flow path attached to the side wall of a TST, has advantages including simple system design, low brine flow rate, and enhanced thermal stratification. In addition, the spiral coil heater further enhances the thermal performance and thermal stratification of the TST. The developed model was validated by the good agreement between the CFD results and the experimental results performed with the hybrid-type TST in SDHW settings.

• 한국신재생에너지학회:학술대회논문집
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• 2005.11a
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• pp.353-362
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• 2005

태양열시스템은 하절기에 급탕과 난방 부하가 적거나, 거의 없어 시스템의 과열 문제가 야기 될 수 있다. 이를 해결하는 방안 중에 하나로 흡수식 냉방시스템을 이용하여 하절기 잉여열원을 활용하여 냉방하는 방법이 대두되고 있다. 태양열 냉방시스템은 전기에너지를 대체하는 효과 뿐 아니라 태양열 연간 이용 효율 극대화에도 크게 기여 할 수 있다. 본 고에서는 국내 기술로 최초로 개발 실용화된 중온용 단일 진공관형 태양열 집열기와 1중 효용 흡수식 냉방기를 이용하여 실증연구를 계획하였다. 태양열 냉방 실증을 위하여 단일 진공관형 태양열 집열기 집열면적 200m2, 축열조(태양열, 급탕, 냉수), 10RT급 냉방기, 냉각탑, 보조 보일러, 원격 제어 및 모니터링 등이 계획 되었다. 실증시험 중간 결과 태양열 냉방시스템은 하절기 맑은 날 하루 동안 약 5 - 6시간 안정적으로 가동 되었으며, 앞으로 온수급탕, 난방 시험을 거쳐 시스템 성능 및 경제성 평가를 통하여 유용성, 안정성 및 신뢰성이 검증 될 계획이다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.3
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• pp.1488-1494
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• 2011

In this paper, we propose an algorithm using linear regression model that forecasts the demand of heated water in winter. To supply heated water to apartments, stores and office buildings, Korea District Heating Corp.(KDHC) operates boilers including electric power generators. In order to operate facilities generating heated water economically, it is essential to forecast daily demand of heated water with accuracy. Analysis of history data of Kangnam Branch of KDHC in 2006 and 2007 reveals that heated water supply on previous day as well as temperature are the most important factors to forecast the daily demand of heated water. When calculated by the proposed regression model, mean absolute percentage error for the demand of heated water in winter of the year 2006 through 2009 does not exceed 3.87%.

• 월간 기계설비
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• s.88
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• pp.82-91
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• 1997

건축물 또는 빌딩의 건축설비에 대한 급배수 위생설비는 ${\ulcorner}$건축물내 또는 부지내에서 사람이 생활하는 음료용, 취사용, 목욕용, 청소용 등에 사용하는 물과 온수를 공급하고 사용한 물을 환경에 영향을 주지 않고 배제하여 보건 위생적 환경을 향상 실현하기 위한 설비로서 급수, 급탕, 배수, 위생기구 설비 및 특수설비 등으로 구성된 것${\lrcorner}$으로 정의하고 있다.

• 월간 기계설비
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• s.86
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• pp.86-99
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• 1997

건축물 또는 빌딩의 건축설비에 대한 급배수 위생설비는 ${\ulcorner}$건축물내 또는 부지내에서 사람이 생활하는 음료용, 취사용, 목욕용, 청소용 등에 사용하는 물과 온수를 공급하고 사용한 물을 환경에 영향을 주지 않고 배제하여 보건 위생적 환경을 향상 실현하기 위한 설비로서 급수, 급탕, 배수, 위생기구 설비 및 특수설비 등으로 구성된 것${\lrcorner}$으로 정의하고 있다.

• 월간 기계설비
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• s.89
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• pp.76-91
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• 1997

건축물 또는 빌딩의 건축설비에 대한 급배수 위생설비는 ${\ulcorner}$건축물내 또는 부지내에서 사람이 생활하는 음료용, 취사용, 목욕용, 청소용 등에 사용하는 물과 온수를 공급하고 사용한 물을 환경에 영향을 주지 않고 배제하여 보건 위생적 환경을 향상 실현하기 위한 설비로서 급수, 급탕, 배수, 위생기구 설비 및 특수설비 등으로 구성된 것${\lrcorner}$으로 정의하고 있다.