The loss of performance of double U-tube Borehole Heat Exchangers due to the thermal short-circuiting between the incoming and the outgoing fluid is studied by means of 3-D finite element simulations performed through COMSOL Multiphysics. Reference is made to a well-designed BHE with a length of 100 m, in winter working conditions, with two different values of the thermal conductivity of the grout and of the volume flow rate.
Loss of performance of double U-tube borehole heat exchangers due to thermal short-circuiting
LAZZARI, STEFANO;PRIARONE, ANTONELLA
2014-01-01
Abstract
The loss of performance of double U-tube Borehole Heat Exchangers due to the thermal short-circuiting between the incoming and the outgoing fluid is studied by means of 3-D finite element simulations performed through COMSOL Multiphysics. Reference is made to a well-designed BHE with a length of 100 m, in winter working conditions, with two different values of the thermal conductivity of the grout and of the volume flow rate.
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