Geothermal Energy Systems and Applications
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Abstract
Abstract
Several studies have experimentally characterized the performance of conventional ground source heat pump systems. However, there are limited studies on the field-scale experimental characterization of solar-assisted ground source heat pump (SAGSHP) systems. In this work, the performance of SAGSHPs integrated with 150 m single and double U-loop ground heat exchangers is investigated using instrumented field-scale experiments on two different test sites in southern Calgary, Canada. The soil formation of the two test sites is quite distinct, both showing the presence of groundwater. The results indicate that when useful solar heat is available, the outlet temperatures of the ground heat exchanger loop connected to the heat pump increased by up to 1.8 °C, providing higher fluid temperatures to the heat pump. For the double U-loop system, the monthly average heating coefficient of performance (COP) from November 2024 to January 2026 was in the range of 4.5 to 5.05. February 2025 showed the lowest COP corresponding to the lowest average outdoor temperature of −11.4 °C. Moreover, for the double U-loop system, the average monthly heat pump loop outlet temperature is consistently higher than the initial ground temperature, indicating solar thermal storage. Likewise, the single U-loop system shows an hourly heat pump average heating COP between 2.53 and 6.76 for January and February 2026. The highest COP corresponds to the time when useful solar thermal energy was available, and, on the contrary, a lower COP corresponds to the time when higher electricity consumption was required to meet the heating demand.
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@article{Adebayo2026Field,
title = {Field-scale experimental characterization of a solar-assisted ground source heat pump system coupled with single and double U-loop vertical ground heat exchangers in a cold climate},
author = {Philip Adebayo and Roman Shor and Aggrey Mwesigye},
journal = {Energy and Buildings},
year = {2026},
doi = {10.1016/j.enbuild.2026.117948},
url = {https://doi.org/10.1016/j.enbuild.2026.117948}
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