Abstract：

With an actual ground source heat pump system example, based on the hourly calculation of annual cooling and heating load, carries out numerical simulation on heat transfer characteristics of the soil around compact pileburied underground heat exchangers with large land area. Presents the concept of heat barrier, and analyses its formation and some characteristics including irregular shape, dynamic changes and potential harmfulness. For the long term operation, the growth rate of temperature is higher than that of average temperature of the soil, the system analysis should therefore be implemented from the viewpoint of both energy equilibrium and heat barrier in order to ensure the whole stability and reliability.

Keywords:groundsourceheatpump,undergroundheatexchanger,pipegroupbehavior,heatbarrier,numericalsimulation