Experimental research of heat exchange with the soil in the ground collectors

Abstract

Experimental research of conventional coefficients of heatexchange of pipe with ground at the flow of air and water in the conditions of short-term operation are performed (operation and stop during few hours). The conventional coefficients of heat exchange of pipe with ground, which decrease with the increase of operation time of ground heatexchanger and are within the limits of 20…50 Wt/(m2·K) are determined. The thickness of active layer of soil near a pipe, which has higher temperature than the soil in the distance, is calculated.