Journal
GEOTHERMICS
Volume 117, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.geothermics.2023.102872
Keywords
Advection; Thermal response test (TRT) groundwater; Line source equation
Categories
Ask authors/readers for more resources
This study proposes a new analytical equation that takes into account the advective heat in fractured rock, improving the accuracy of measuring thermal properties in borehole heat exchangers. The equation is applicable to all thermal response tests and provides a cost-effective alternative to numerical modelling.
Proper design of larger ground source heat pump installations, and borehole thermal energy storages (BTES) requires determination of on-site thermal properties of the ground by performing a thermal response test (TRT). The effective thermal conductivity is an important design parameter from TRT that is determined from the line source equation. The line source equation does not include advection and may give incorrect results when groundwater flow is present. This study describes the development and application of a new analytical equation where advective heat in fractured, nonporous rock is accounted for. Including advective heat improves the fit to the measurement data (1.2-77 % better) when applying reasonable values for the thermal conductivity of the ground. The new analytical equation is applicable to all TRTs. Previous studies recommend comprehensive numerical modelling of boreholes affected by groundwater flow. The equation proposed here is an analytical alternative which does not require modelling and is a recommended and cost-effective alternative when groundwater flow affects the thermal properties measured in a borehole heat exchanger in fractured rock.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available