The constant heat flow test of the

The constant heat flow test of the 1 # buried tube heat exchanger has a heating power of about 5.0 kW and a circulating water flow of about 0.95 m3 / h. Under constant heat flow conditions, the change in inlet and outlet water temperature over time and the change in average temperature of inlet and return water over time under constant heat flow conditions of 1 # buried pipe are shown in Figure 5.2 and Figure 5.3, respectively. Changes over time are shown in Figure 5.4. According to the linear heat source theory, the parameter optimization method is used to obtain the thermal conductivity and heat capacity of the rock and soil.