Relationship between ground temperature behavior and ground surface coverage in Slinky-coil type horizontal ground heat exchanger

Abstract

In order to investigate the effect of the ground surface coverage on the horizontal ground heat exchanger (HGHE), a long-term monitoring of ground temperature and thermal response tests (TRTs) were conducted using three HGHEs under lawn, soil and asphalt, respectively. The monitoring showed that the ground temperature behavior of the lawn was most stable. The TRTs showed that the temperature increase per unit heat exchange rate of the lawn was the lowest among the other coverages. Long-term simulations in heating and cooling operations using HGHE simulation models showed the efficiency of HGHE under lawn was improved in the cooling period.