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Calculation of Borehole Thermal Resistance

Saqib Javed (Institutionen för bygg- och miljöteknik, Installationsteknik ) ; Jeff Spitler
Advances in Ground-Source Heat Pump Systems p. 63-95. (2016)

The borehole thermal resistance – that is, the thermal resistance between the fluid in the U-tube and the borehole wall – is a key performance characteristic of a closed-loop borehole ground heat exchanger. Lower borehole thermal resistance leads to better system performance. Since the original identification of the concept borehole thermal resistance by Mogensen (1983), there have been numerous methods proposed for calculating this. In this chapter, we present methods for calculating local borehole thermal resistance and effective borehole thermal resistance which account for short-circuiting between the upward and downward-flowing legs of the ground heat exchanger. We also compare a wide range of simple, relatively easy-to-calculate methods to a detailed reference method and recommend suitable simplified methods.

Nyckelord: borehole thermal resistance, local resistance, effective resistance, multipole, resistance network, grout resistance, calculation, comparison

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Denna post skapades 2016-06-26. Senast ändrad 2017-01-19.
CPL Pubid: 238280


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