A thermal response method of calculating a soil's thermal properties when backfill material information is unavailable

作者：Zheng, Xiaohong; Zhang, Lei; Ren, Qian; Qian, Hua^*

来源：Energy and Buildings, 2013, 56: 146-149.

DOI：10.1016/j.enbuild.2012.09.020

• GSHP
• Soil thermal properties
• Line source properties
• Thermal response method

The accurate definition of soil thermal properties around a borehole is helpful when designing a ground source heat pump system. Existing thermal response methods for obtaining a soil's thermal properties require knowledge of the backfill material's conductivity, which is difficult for a technician to obtain in situ. This study developed a new method to calculate a soil's thermal diffusivity when the backfill material's thermal conductivity in the borehole is unavailable. The developed model was verified by a theoretical calculated method. An experiment was conducted in situ to measure a soil's thermal conductivity for use with a ground source heat pump system and the results were used to verify the proposed method. The soil conductivity was measured as 1.98 W/(m K) and the thermal diffusivity was 2.79 x 10(-7) m(2)/s when the backfill material's thermal conductivity was available, while the new method gave a thermal diffusivity of 2.81 x 10(-7) m(2)/s. The results indicated that the proposed method would be useful in future engineering projects, especially those lacking information on a backfill material's properties.

• 出版日期2013-1
• 单位东南大学