Validation of borehole heat exchanger models against multi-flow rate thermal response tests
Journal article, 2018

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.

resistance

Geology

einhart js

Ground-source heat pump

deep-sea research

simulation

1968

Borehole thermal

p497

Energy & Fuels

Ground heat exchanger

v15

Thermal response test

Author

Richard A. Beier

Oklahoma State University - Stillwater

Matt S. Mitchell

Oklahoma State University - Stillwater

Jeffrey D. Spitler

Oklahoma State University - Stillwater

Saqib Javed

Chalmers, Architecture and Civil Engineering, Building Services Engineering

Geothermics

0375-6505 (ISSN)

Vol. 71 55-68

Subject Categories

Energy Engineering

DOI

10.1016/j.geothermics.2017.08.006

More information

Latest update

9/24/2019