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The Modified Integrated Cylindrical Source Model
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YU Xin1,LIAN Zhiwei1,CHEN Jianping2，PAN Li1,WANG Yuemei1
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(1. Institute of Refrigeration and Cryogenics Engineering, Shanghai Jiaotong University, Shanghai 200240, China; 2. Shanghai Research Institute of Building Science, Shanghai 201108, China)
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Abstract A thermal resistance correction factor aimed at the backfill material of the borehole was developed by analyzing the unsteady heat transfer of vertical embedded pipe for ground source heat pump, and the heat shortcircuit modification was introduced to modify the mean temperature of the circulating water. Meanwhile, a cylindrical source integrated modified model was developed based on the modification of the existing Carslaw cylindrical source model. The accuracy of the modified model was proved by the comparison of the calculation result and the experimental one, and the influence of the backfill grout, the equivalent radius, thermal ununiformity and the heat shortcircuit on the result was also further analysed.
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Received: 24 June 2009
Published: 31 October 2010
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