Validation of borehole heat exchanger models against multi-flow rate thermal response tests

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Validation of borehole heat exchanger models against multi-flow rate thermal response tests. / Beier, Richard A.; Mitchell, Matt S.; Spitler, Jeffrey D.; Javed, Saqib.

I: Geothermics, Vol. 71, 01.01.2018, s. 55-68.

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

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Beier, Richard A. ; Mitchell, Matt S. ; Spitler, Jeffrey D. ; Javed, Saqib. / Validation of borehole heat exchanger models against multi-flow rate thermal response tests. I: Geothermics. 2018 ; Vol. 71. s. 55-68.

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TY - JOUR

T1 - Validation of borehole heat exchanger models against multi-flow rate thermal response tests

AU - Beier, Richard A.

AU - Mitchell, Matt S.

AU - Spitler, Jeffrey D.

AU - Javed, Saqib

PY - 2018/1/1

Y1 - 2018/1/1

N2 - A recently developed vertical borehole ground heat exchanger model that accounts for transit time effects and time-varying short-circuiting heat transfer has been validated against two multi-flow-rate thermal response tests (MFR-TRT). The MFR-TRT, when performed with a wide range of flow rates, results in significant changes in the borehole thermal resistance, the borehole internal thermal resistance, and the short-circuiting heat transfer between the two legs of a single U-tube. The model accounts for short-circuiting by an analytically computed weighting factor that is used to determine the mean fluid temperature. The weighting factor portion of the model can be readily utilized in other ground heat exchanger models that currently rely on a simple mean fluid temperature. Use of the weighting factor is shown to give significantly better estimations of entering and exiting fluid temperature than using the simple mean fluid temperature. The new model is also compared to an alternative approach − using an effective borehole thermal resistance. While both the effective borehole thermal resistance model and the weighting factor give quite good results a few hours after a step change in flow rate, the weighting factor model gives much better results in the first few hours after a step change in flow rate.

AB - A recently developed vertical borehole ground heat exchanger model that accounts for transit time effects and time-varying short-circuiting heat transfer has been validated against two multi-flow-rate thermal response tests (MFR-TRT). The MFR-TRT, when performed with a wide range of flow rates, results in significant changes in the borehole thermal resistance, the borehole internal thermal resistance, and the short-circuiting heat transfer between the two legs of a single U-tube. The model accounts for short-circuiting by an analytically computed weighting factor that is used to determine the mean fluid temperature. The weighting factor portion of the model can be readily utilized in other ground heat exchanger models that currently rely on a simple mean fluid temperature. Use of the weighting factor is shown to give significantly better estimations of entering and exiting fluid temperature than using the simple mean fluid temperature. The new model is also compared to an alternative approach − using an effective borehole thermal resistance. While both the effective borehole thermal resistance model and the weighting factor give quite good results a few hours after a step change in flow rate, the weighting factor model gives much better results in the first few hours after a step change in flow rate.

KW - Borehole heat transfer

KW - Borehole thermal resistance

KW - Ground heat exchanger

KW - Ground-source heat pump

KW - Thermal response test

U2 - 10.1016/j.geothermics.2017.08.006

DO - 10.1016/j.geothermics.2017.08.006

M3 - Article

AN - SCOPUS:85034021975

VL - 71

SP - 55

EP - 68

JO - Geothermics

JF - Geothermics

SN - 0375-6505

ER -