Simulation of heat transfer capacity of single and double U-type heat exchangers

Taking the single and double U-type heat exchangers as objects, simulates the heat transfer capacity by FLUENT software. Compares the calculated results with those from testing, verifying the accuracy of the simulation model. As a result, on heat extraction condition, the heat exchanging capacity per unit well depth of a single U-type heat exchanger is 86 W/m，while that of double U-tube is 120 W/m. The double U-type heat exchanger is more suitable to where the well drilling expense is higher. Studies the influencing factors of inlet water temperature, water flow velocity and depth of ground heat exchanger on the heat transfer capacity of single U-type heat exchanger.