Study on Designing and Installation Effect of Fresh Air Load Reduction by using Underground Double Floor Space-Experimental Result and Proposal of Numerical Model for Thermal Performance-

지열을 이용한 공조외기부하저감(空調外氣負荷低減)시스템의 설계 및 도입 효과에 관한 연구 -실측결과 및 열성능 예측을 위한 수치모델의 제안-

This paper presents a feasibility study of a fresh air load reduction system by using an underground double floor space The system was introduced into a real building and was examined by the field measurement Judging from the measurements during three years(1999~2001), the state of the system operation was very stable through this period and it was clear that the system contributes to reduction of energy consumption for air-conditioning. Futhermore, a simulation model used the simple heat diffusion equation Was developed to simulate its thermal characteristics and performances The simulations resulted m air temperature in good agreement with the measurements. Also, from the result of numerical analysis, It is clear that the amount of heat supply by using this system is more than the amount of energy loss to the room above it. Therefore, it is concluded that this systems is very useful and the proposed numerical model can be used for the prediction of system thermal performance.