한국신재생에너지학회:학술대회논문집
- 한국신재생에너지학회 2009년도 춘계학술대회 논문집
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- Pages.600-603
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- 2009
초기 지중온도 측정이 지중 열교환기 설계에 미치는 영향
Effect of initial ground temperature measurement on the design of borehole heat exchanger
- 발행 : 2009.06.25
초록
We compared relative importance of thermal conductivity and initial ground temperature in designing borehole heat exchanger network and also we test accuracy of ground temperature estimation in thermal response test using a proven 3-D T-H modeler. The effect of error in estimating ground temperature on calculated total length of borehole heat exchanger was more than 3 times larger than the case of thermal conductivity in maximum 20% error range. Considering 10% of error in estimating thermal conductivity is generally acceptable, we have to define the initial ground temperature within 5% confidence level. Utilizing the mean annual ground surface temperature and the geothermal gradient map compiled so far can be a economic way of estimating ground temperature with some caution. When performing thermal response test for estimating ground temperature as well as measuring thermal conductivity, minimum 100 minutes of ambient circulation is required, which should be even more in case of very cold and hot seasons.
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