| Title |
Thermal Conductivity Measurement of Grouting Materialsfor Ground Heat Exchanger Borehole |
| Keywords |
Thermal conductivity ; 열전도도 ; Grouting material ; 그라우팅 재료 ; Bentonite ; 벤토나이트 ; Additive ; 첨가제 ; Ground heat exchanger ; 지중 열교환기 ; Borehole ; 보어홀 ; Transient hot wire method ; 비정상 열선법 |
| Abstract |
This paper concerns the measurement of thermal conductivity of grouting materials for ground loop heat exchanger. A thermal conductivity meter, QTM-500 based on modified transient hot wire method was used to measure the thermal conductivity of neat bentonite and mixtures of bentonite and various additives. Relative to the total mixture mass, as the percent additive was increased the mixture thermal conductivity increased. For the bentonite-silica sand mixtures, the higher density of the sand particles resulted in much higher mixture thermal conductivity. The quartzite and silica sands produced the largest increases in mixture thermal conductivity, while common masonry and limestone sands produced lower thermal conductivity increases. |