Numerical simulation and the Heat Transfer Performance of Multi-layers Horizontal Spiral Coil Ground Heat Ex-changer
A three-dimensional numerical simulation model of multi-layers horizontal spiral coil ground heat ex-changer group(HSCGHEG)was established Based on COMSOL software.The heat transfer performance and temperature field of multi-layers HSCGHEG were studied.The results show that the fluid temperature in multi-layers HSCGHEG far from the injection point is relatively low.The formation temperature around the multi-layers HSCGHEG increases,and the formation temperature away from the injection point changes relatively small.The heat transfer capacity of multi-layers HSCGHEG increases with increasing of circulating fluid flow rate,but the increase rate decreases.The flow rate of circulating fluid should be designed reasonably.The heat transfer capacity of the 3-layers HSCGHEG is slightly higher than that of the 2-layers HSCGHEG,but the interference between layers is obvious.So it is recommended to choose the 2-layers HSCGHEG.
Horizontal spiral coil ground heat ex-changerHeat transfer characteristicsNumerical simulationMulti-layers ground heat ex-changerGround heat ex-changer group
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