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2 results on '"3D thermal resistance"'

1. Effects of the temperature distribution on the thermal resistance of double u-tube borehole heat exchangers.

Author

Zanchini, Enzo and Jahanbin, Aminhossein

Subjects
*TEMPERATURE distribution, *THERMAL resistance, *BOREHOLES, *HEAT exchangers, *FINITE element method
Abstract

The effects of the surface temperature distribution on the thermal resistance of a double U-tube Borehole Heat Exchanger (BHE) are studied by finite element simulations. It is shown that the thermal resistance of a BHE cross section is not influenced by the bulk-temperature difference between pairs of tubes, but is influenced by the thermal conductivity of the ground when the shank spacing is high. Then it is shown that, if the real mean values of the fluid bulk temperature and of the BHE external surface are considered, the 3D thermal resistance of the BHE coincides with the thermal resistance of a BHE cross section, provided that the latter is invariant along the BHE. Finally the difference between the BHE thermal resistance and the effective BHE thermal resistance, defined by replacing the real mean temperature of the fluid with the average of inlet and outlet temperature, is evaluated in some relevant cases. [ABSTRACT FROM AUTHOR]

Published
2018
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2. Effects of the temperature distribution on the thermal resistance of double u-tube borehole heat exchangers

Author

Aminhossein Jahanbin, Enzo Zanchini, Zanchini, Enzo, and Jahanbin, Aminhossein

Subjects
Renewable Energy, Sustainability and the Environment, 020209 energy, Thermal resistance, Bulk temperature, 2D thermal resistance, Borehole, Thermodynamics, Geology, 02 engineering and technology, Mechanics, Geotechnical Engineering and Engineering Geology, Finite element method, Cross section (physics), Thermal conductivity, 3D thermal resistance, Heat exchanger, Borehole heat exchanger, 0202 electrical engineering, electronic engineering, information engineering, Effective thermal resistance, Mean radiant temperature, Finite element simulation
Abstract

The effects of the surface temperature distribution on the thermal resistance of a double U-tube Borehole Heat Exchanger (BHE) are studied by finite element simulations. It is shown that the thermal resistance of a BHE cross section is not influenced by the bulk-temperature difference between pairs of tubes, but is influenced by the thermal conductivity of the ground when the shank spacing is high. Then it is shown that, if the real mean values of the fluid bulk temperature and of the BHE external surface are considered, the 3D thermal resistance of the BHE coincides with the thermal resistance of a BHE cross section, provided that the latter is invariant along the BHE. Finally the difference between the BHE thermal resistance and the effective BHE thermal resistance, defined by replacing the real mean temperature of the fluid with the average of inlet and outlet temperature, is evaluated in some relevant cases.

Published
2018

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