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잠열축열 장치를 갖춘 온실의 난방 열 특성 예측모형 개발
노정근(J.G.Ro),송현갑(H.K.Song) 한국태양에너지학회 2001 한국태양에너지학회 논문집 Vol.21 No.3
A greenhouse equipped with latent heat storage system was built to obtain various thermal properties, such as greenhouse air temperature, soil surface temperature, energy flow in latent heat storage, etc., which could be used in validation of greenhouse numerical model to be developed in this study. This numerical model expressed with Newton-Raphson method was programed by C-language and utilized to simulate greenhouse thermal behavior. Greenhouse air temperature and soil surface temperature predicted by the greenhouse model developed in this study were very close to the measured data obtained through almost 3 years of experiment. Therefore, it is concluded that the greenhouse model developed and verified by measured data could be utilized for simulating various thermal behaviors of greenhouses equipped with latent heat storage system to be used for energy saving purposes.
부하변동에 의한 지중유효열전도도와 보어홀 전열저항 해석
노정근(Ro,Jeong-Geun),연광석(Yon,Kwang-seok),송헌(Song,Heon) 한국태양에너지학회 2011 한국태양에너지학회 논문집 Vol.31 No.4
Investigation of the effective soil thermal conductivity(κ) is the first step in designing the ground loop heat exchanger(borehole) of a geothermal heat pump system. Another important factor is the borehole thermal resistance(R<SUB>b</SUB>). Thermal response tests offer a good method to determine the ground thermal properties for the total heat transport in the ground. This is done by supplying a constant heat power into a borehole heat exchanger. There are two methods to supply a constant heat power. One is to employ the electricity provided by Korea Electric Power Corporation(KEPCO). The other is to use electricity generated by a generator. In this study, the power supply regulation was found to reduce when the electricity generated by the generator was used. This is because the generator evaluated with the power supply characteristically reduces the power supply regulation between an overload and a complex using. But it sometimes occurs a power supply regulation in In-situ thermal response test. In this case getting of κ, R<SUB>b</SUB> requires delay times and restored normal state. However, the effect of the delay times and restored normal state on the soil thermal conductivity and borehole thermal resistance is very small. Therefore it is possible to use a generally accepted delay times and restored normal state in the analysis. In this work, it is also shown that an acceptable range Δκ, ΔRb, for normal state and regulation state might be approximately 0.01-0.16 W/m · k, and -0.004-0.007m · K/ W, respectively. Thus, restored normal state of power supply regulation is valuable to recommend.
지중 열전도율이 보어홀 길이에 미치는 영향에 관한 연구
이세균 ( Se Kyoun Lee ),노정근 ( Jeong Geun Ro ) 충북대학교 산업과학기술연구소 2009 산업과학기술연구 논문집 Vol.23 No.2
The effect of soil thermal conductivity on the borehole length is studied. In performing this work the solution of line source model is used. A new concept, (L/Q)r , borehole length per unitgeothermal load ratio, is developed to compare the effect of soil thermal conductivity on the borehole length. It is shown that (L/Q)r is a function of soil thermal conductivity(k)and only very weak function of borehole thermal resistance(R(b)). There is no functional dependency of the (L/Q)r on the temperature( T(fe). Thus it is easy to estimate the effect of on the borehole length with (L/Q)r . The result of this study is also examined with EED analysis.
이세균(李世均) 교수(敎授) 정년퇴임기념특집(停年退任紀念特輯) : 지중 열전도율이 보어홀 길이에 미치는 영향에 관한 연구
이세균 ( Se Kyoun Lee ),노정근 ( Jeong Geun Ro ) 충북대학교 산업과학기술연구소 2010 산업과학기술연구 논문집 Vol.24 No.2
The effect of soil thermal conductivity on the borehole length is studied. In performing this work the solution of line source model is used. A new concept, (L/Q) , borehole length per unit geothermal load ratio, is developed to compare the effect of soil thermal conductivity on the borehole length. It is shown that (L/Q) is a function of soil thermal conductivity(K) and onlyvery weak function of borehole thermal resistance(R(b)). There is no functional dependency of the (L/Q) on the temperature(L/Q). Thus it is easy to estimate the effect of K on the borehole length with (L/Q) . The result of this study is also examined with EED analysis.