In-Suit Testing and Analysis of Thermal Properties of the Ground Formation in Zhejiang, China

Abstract

The borehole exchanger (BHE) exchange heat with the surrounding ground, which is the core heat exchange component of Ground source heat pump(GSHP). The thermal properties of the surrounding rock, soil and backfill in the borehole have a great impact on the performance of the BHE. Ensure thermal properties’ accuracy could facilitate GSHP’s design and reduce investment. The data of thermal properties measured in laboratory do not comply the in-situ conditions. To get the more accurate data of the thermal conductivity (λ) of the ground formation in the vicinity of a BHE, and the effective thermal resistance (Rb) of this latter, in-situ thermal response test can be the best choice. In this paper, we use in-suit TRT method get the thermal response of BHE in Shaoxing City, Zhejiang Province, China. And the λ and Rb of borehole are measured as 2.27W⋅m−1⋅K−1 and 0.123 (m⋅K⋅W−1).