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- 저자 : 최덕인(Choi Deok-In) (검색결과 4 건)
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난방·융설 겸용 지열원 히트펌프 시스템의 운전성능 평가
최덕인(Deok-In Choi),김중현(Joong-Hun Kim),황광일(Kwang-Il Hwang) 한국지열·수열에너지학회 2012 한국지열에너지학회논문집 Vol.8 No.1
This study proposes a hybrid geothermal system combined mode and snow-melting mode for winter season in order to increase the annual operating efficiency of the GSHP(Ground Source Heat Pump). The purpose of this study is to get effectiveness of the hybrid geothermal system by the site experiments. In case of snow-melting only mode, the GSHP COP is 0.7 higher than system COP in average. And in case of hybrid mode, heating GSHP COP is 0.5 higher than snow-melting GSHP COP. And it is also found out that all COP obtained through measurement periods is higher than nominal COPs given by GSHP manufacturer. As a conclusion, it is clear that the proposed hybrid geothermal system is expected as a highly efficient system.
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양잉찬(Ing-Chan Yang),최덕인(Deok-In Choi),황광일(Kwang-Il Hwang) 한국항해항만학회 2011 한국항해항만학회 학술대회논문집 Vol.2011 No.추계
In the Future, We predict that casualties, property and facility damage are occurred by the occurrence of a large disaster. In order to prepare the disasters, the government should carry out a plan of preventing disasters and preventive discipline about disasters.
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지열원히트펌프를 활용한 도로융설시스템의 성능 평가 및 예측
최덕인(Choi Deok-In),황광일(Hwang Kwang-Il) 한국태양에너지학회 2012 한국태양에너지학회 논문집 Vol.32 No.3
Because of the climate changes and the development of building technologies, the cooling loads have been increased. Among the various renewable energies, geothermal energy is known as very useful and stable energy for heating and cooling of building. This study proposes a mad snow melting system of which heat is supplied from GSHP(Ground source heat pump) in viewpoint or the initial investment and annual running performance, which is also operating as a main facility of heating and cooling for common spaces. The results of this study is as followings. From the site measurement, it is found out that the road surface temperature above the geothermal healing pipe rose up to 5℃, which is the design temperature of road snow-melting, after 2 hours' operation and average COP(Coefficient of performance) was estimated as 3.5. The reliability of CFD has confirmed, because the temperature difference between results of CFD analysis and site measurement is only ±0.4℃ and the trend of temperature variation is quite similar. CFD analysis on the effect of pavement materials clearly show' that more than 2 hours is needed for snow-melting, if the road is paved by ascon or concrete. But the road paved by brick is not reached to 5℃ at all. To evaluate the feasibility of snow-melting system operated by a geothermal circulation which has not GSHP, the surface temperature of concrete-paved road rise up to 0℃ after 2 hour and 40 minutes, and it does never increase to 5℃. And the roads paved by ascon and brick is maintained as below 0℃ after 12 hours geothermal circulation.
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고온 초전도체 Y₁-x Gdx Ba₂Cu₃O7-y의 임계전류밀도에 관한 연구
전인,송승기,최덕,김영호 명지대학교자연과학연구소 1991 자연과학논문집 Vol.9 No.-
고온 초전도체 Y₁-??Nd??Ba₂Cu₃O??-??(x=00.1, 0.2, 0.3,...,1.0)를 고상 반응법을 이용하여 제작하였다. 온도에 따른 전기적 비저항의 측정과 자기적 감수율의 측정을 통하여 구한 초전도 전이온도는 92.1∼93.5K 사이에 존재하였다. 77K에서 시료의 자기적 감수율은 -5.06∼-6.83Χ10??emu/㎤ㆍOe 사이에 존재하였으며, 상온에서의 비저항은 x=0.6인 시료를 제외하고 x가 증가함에 따라 감소하였다. 수송 임계전류밀도는 자기장이 0일때 51.6∼80.6 A/㎠사이에서 측정되었으며 x가 증가함에 따라 대체로 증가하였다. 자기장을 가해준 상태에서 측정한 수송 임계전류밀도 는 자기장이 증가함에 따라 급격히 감소하였다. 자기 이력곡선으로부터 Bean의 공식을 이용하여 구한 임계전류밀도는 수송 임계전류밀도의 0.8∼2.7Χ10??배로 크게 나타났다. High-Tc superconductors Y₁-??Nd??Ba₂Cu₃O??-??(x=0.1, 0.2, 0.3,…,1.0) have been prepared by solid state reaction method. The superconduction transition temperatures determined by the temperature dependence of electric resistivity and magnetic susceptibility are in the range between 92.1 and -6.83Χ10??emu/㎤·Oe and the resistivities at room temperature are decreased as increasing Gd contents except for the value of x=0.6 sample. Transport critical current densities have the value of 51.6∼80.6 A/㎠ and are generally increased with increasing the magnetic field. Magnetic critical current densities obtained from the magnetization curve using the Bean's law are about 0.8∼2.7Χ10??times of the transport J??.
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