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The effect of ground properties with heat conduction between soil and ground loop heat exchangers(GLHEs)has been analyzed.A finite line source model proposed by Cui,Yang,and Fang is used.Far field radius is defined.The analyses for a 1.5m borehole line source in three kinds of soil conditions:damp and breeze(D.B.),damp and heavy(D.H.),and saturated and heavy(S.H.)are carried out.The results of the comparisons show that in the condition of continuous operation,the variation of the far field radius is related to soil thermal conductivity.The rate of heat transfer will decrease after long time operation.And then soil condition will not influence the far field radius obviously.
The effect of ground properties with heat conduction between soil and ground loop heat exchangers (GLHEs) has been analyzed. A finite line source model proposed by Cui, Yang, and Fang is used. Field radius is defined. The analyzes for a 1.5m borehole line source in three kinds of soil conditions: damp and breeze (DB), damp and heavy (DH), and saturated and heavy (SH) are carried out. The results of the comparisons show that in the condition of continuous operation, the variation of the far field radius is related to soil thermal conductivity. rate of heat transfer will decrease after long time operation. And then soil condition will not influence the far field radius obviously.