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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.
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.
외부 긴장재로 보강된 연속 강합성교의 증가 프리스트레스력을 사용한 내하력 산정
최동호(Choi Dong Ho),김용식(Kim Yong Sik),김은지(Kim Eun Ji),최덕일(Choi Deok Il) 한국구조물진단유지관리학회 2007 한국구조물진단학회 학술발표회논문집 Vol.11 No.1
In this paper, a method of increasing in load-carrying capacity is shown in two-span continuous steel-concrete composite bridges strengthened by external tendons. An analytic expression for the increment of tendon force is derived using virtual work method for configurating of draped tendons under external loads. Considering the initial tendon force and its increment under external loads, a new rating factor equation is proposed. A analytic procedure has been developed to calculate the number of tendons and the initial tendon force using the proposed rating factor equation. Also, This method is used to verify a validity and rationality for an existing two-span continuous composite steel-concrete bridges.
외부 긴장재로 보강된 연속 강합성교의 증가 프리스트레스력을 사용한 내하력 산정
최동호 ( Choi Dong Ho ),김용식 ( Kim Yong Sik ),김은지 ( Kim Eun Ji ),최덕일 ( Choi Deok Il ) 한국구조물진단유지관리공학회 2007 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.11 No.1
In this paper, a method of increasing in load-carrying capacity is shown in two-span continuous steel-concrete composite bridges strengthened by external tendons. An analytic expression for the increment of tendon force is derived using virtual work method for configurating of draped tendons under external loads. Considering the initial tendon force and its increment under external loads, a new rating factor equation is proposed. A analytic procedure has been developed to calculate the number of tendons and the initial tendon force using the proposed rating factor equation. Also, This method is used to verify a validity and rationality for an existing two-span continuous composite steel-concrete bridges.
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.