• 한국태양에너지학회 논문집
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• 제28권5호
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• pp.21-27
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• 2008

In this study, the design of the solar heating system for district heating as well as it's operating characteristics and the performance analysis was carried out. This solar district heating system was composed of two different types of solar collector circuit, flat plate and vacuum tube solar collector, in a system. This system supply constant temperature of hot water without solar buffer tank. For this, the proportional(variable flow rate) control was used. The experimental facility for this study was used the Bundang district solar heating system which was installed in the end of 2006. The operating characteristics and behaviour of each collector circuits are investigated especially for the system design and control. The yearly solar thermal efficiency is 47.5% on the basis of aperture area and 39.8% on the basis of gross area of collector. As a result this solar heating system without solar buffer tank and with proportional controller was testified a very effective and simplified system for district heating. It varied especially depend on the weather condition like as solar radiation and ambient temperature.

• 한국태양에너지학회 논문집
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• 제26권4호
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• pp.127-134
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• 2006

In this paper, an experiment was carried out to investigate the thermal behavior and performance on a solar space heating & hot water system in an apartment. Measurement was continued for 6 months between January 1st 2004 and June 31th 2004. The results show that there is no problem in control and operation in case of connection this system with conventional space heating and hot water system, and that the thermal performance of this system and indoor thermal environment is good.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2005년도 제17회 워크샵 및 추계학술대회
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• pp.595-598
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• 2005

The thermal performance of glass evacuated tube solar collectors are numerically and experimentally investigated. Four different shapes of solar collectors are considered and the performances of these solar collectors are compared. Dealing with a single collector tube, the effects of not only the shapes of the absorber tube but also the incidence angle of solar irradiation (beam radiation) on thermal performance of the collector are studied. However the solar irradiation consists of the beam radiation as well as the diffuse radiation. Also, the interference of solar irradiation and heat transfer interaction between the tubes exist in an actual solar collector. These effects are considered in this study experimentally and numerically the accuracy of the numerical model is verified by the experimental results. The result shows that the thermal performance of the absorber used a plate fin and U-tube is the best.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2007년도 춘계학술대회
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• pp.684-687
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• 2007

Research on the solar thermal hybrid power generation technology which uses solar thermal chemical reaction has been carried out in KIER, The research covers development of solar concentration system and solar reactor for methane steam reforming reaction. This paper introduces a brief review and prospects of oversea's researches in similar areas and KIER's research progresses up to now.

• 태양에너지
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• 제4권2호
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• pp.51-57
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• 1984

The aim of the study is to the thermal performance of TAP (Thermosiphoning Air Panel) which is easily applicable to existing building as well as new building. TAP is one of the advantageous means of passive solar system, with a view to reducing the energy consumption of existing and new building. The instantaneous thermal efficency of a thermo siphoning collector depends primarily on the heat loss coefficient of the collector, the effectiveness of heattransfer between the absorber and the air, the average air temperature in the collector, the ambient air temperature, and the transmitted solar radiation. Because the important design variables are interrelated, it is, difficult to determine the effect of design decisions based on intuition. Therefore economical and effective TAP can be used easily, TAP had been designed and analyzed.

• 한국태양에너지학회 논문집
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• 제22권1호
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• pp.43-53
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• 2002

This study has been carried out to study the thermal performance of an all-glass type solar collector tube when a heat transfer medium is used with a heat storage unit capable of preventing pressure build-up within the tube. The heat storage unit is devised such that it performs the dual function of relieving excessive pressure and storing solar thermal energy. Different types of heat storage medium are tested under heat-up phase of a collector tube. It is found that the proposed unit could be used quite effectively if one wishes to capitalize more aggressively in harnessing the solar energy.

• 한국에너지공학회:학술대회논문집
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• 한국태양에너지학회, 한국에너지공학회 1993년도 춘계 공동학술발표회 초록집
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• pp.64-69
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• 1993

The solar energy collection of a passive solar system depends on the finish of collecting surfaces. In this study, the test models of T.W system with different wall surface finishes were constructed, and the temperature distribution through the models was monitored. At the same time, a computer program based on F.D.M was developed in order to simulate various surface finishes. The difference of indoor temperature between the model with white color finish ($\alpha$=0.25) and the one with black color finish ($\alpha$=0.95) was about 1$0^{\circ}C$. For the wall with selective coating, the indoor temperature was 4-5$^{\circ}C$ higher than that of red brick wall, and 3-4$^{\circ}C$ higher than that of wall with black paint.

• 한국에너지공학회:학술대회논문집
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• 한국태양에너지학회, 한국에너지공학회 1993년도 춘계 공동학술발표회 초록집
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• pp.70-78
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• 1993

Heat pipes, applied to flat plate solar collectors, have a long and slender configuration with relatively low heat flux on the evaporator. Such a heat pipe has a tendency to build-up a liquid pool at the lower half of evaporator zone, and at this pool occurs such complicated phenomena of evaporation and fluid dynamics as superheat, sudden generation of bubble, its likely explosive growth process and flooding etc. In the present study, we tried to solve those problems by means of adjusting the two principle design parameters, liquid fill charge and wick length, using 4 heat pipes and 3 thermosyphons, with different values of parameter respectively. The corresponding results can be summarized as followings, - The thermal conductance of heat pipes was largely improved by el eliminating wick from adiabatic and condenser zone. - But on evaporator zone wick is inevitable to reduce behavior of the build -up of liquid pool , where arise diverse internal complex phenomena. - The liquid fill charge should have to be increased by 10∼20％ more than the quantity to saturate the wick.

• 기계저널
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• 제18권3호
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• pp.25-32
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• 1978

1973년 석규파동 이후 세계 각국은 에너지 문제를 심각하게 다루어 왔다. 화석 연료의 유한성은 미래의 세계 에너지에 대한 연구에 박차를 가해왔다. 현재 사용되는 연료로는 화석연료인 석탄, 석유, 그리고 원자력등이 있다. 그러나 이들은 모두 그의 매장이 어느지역에 제한된 지역편재성이 있는 것이며 그의 사용에 따른 대기오염, 환경오염등의 점차적으로 큰 문제로 대두되고 있다. 본 연구에서는 과거 71년부터 77년까지의 기상조건을 중심으로 하여 기온, 수평면 일사량, 운량, 일조시간에 대한 전반적인 조사를 근거로 이에대한 통계를 제시하고, 이들의 상호관계에 대한 일 반적인 식을 유도하였다. 그리고 1977년 8월부터 78년 3월까지의 수령면 일사량과 서울 지방에서 최적치라고 알려진 53도 경사면에서의 전 일사량을 측정하여 이에 대한 자료를 제시함으로써 국 내에서의 태양열 이용에 대한 기초자료를 마련하였다. 이어서 주어진 집열기에 의한 태양열 주택 의 설계와 이에따른 경제성 타당 검토를 하고자 하였다.

• 태양에너지
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• 제6권1호
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• pp.24-30
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• 1986

A concentrating solar collector of parabolic-cylindrical type is designed and constructed to provide a heat source of higher temperature for drying processes. Usually collectors of concentrating type require such peripheral auxiliary units as solar tracking system, heat medium circulation pump and temperature controller. However in this study, for simplification's sake in the maintenance of a collector system, it is intended to design a concentrating collector system which does not furnish these auxiliary units by adapting natural circulation system instead of foced circulation and by adjusting collector system to solar altitude manually and periodically. And based on the experimental data, a conceptual design for a heat sources of 50KWt thermal output is presented and discussed.