2010•Journal of Tianjin University Science and TechnologyRequires access
Numerical Simulation of Heat Transfer of Soil Around U-Tube Undergroud Heat Exchanger
Hongting Ma
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Abstract
A two-dimensional unsteady conduction model of heat transfer between a U-tube heat exchanger and the soil in an infinite zone was established by employing the column heat reservoir model.The data obtained from a U-tube performance experiment conducted in Tianjin were used as input,and the temperature distribution of six-year soil in the same area was simulated by FLUENT software.The temperature of the nearest point,which is 1 m away from the pipe,drops the fastest in velocity and greatest in amplitude.The velocity and amplitude decrease as the dis-tance between the typical point and the U-tube increases.The temperature of the farthest point,which is 7 m away from the pipe,is free from the impact of the heat exchanger,remaining at the initial temperature of about 14.5 ℃.