抄録
The execution example of snow-melting system using ground heat was introduced. As a TRT result, the effective thermal conductivities of soil were 1.92W/m・K in A-district, 1.79W/m・K in B-district. The heat extraction from thermal exchange bore hole with single U-single-tube type of depth 100m was 69.5w/m. The heat extraction from thermal exchange bore hole with duble-tube type of depth 150m was 59.2w/m. It guessed this difference by nature of soil and ground water.
