<  Back to the Polytechnique Montréal portal

Analysis of Retrofit Solutions of a Ground Source Heat Pump System: An Italian Case Study

Angelo Zarrella, Roberto Zecchin, Philippe Pasquier, Diego Guzzon, Enrico Prataviera, Jacopo Vivian, Michele De Carli and Giuseppe Emmi

Article (2020)

Open Acess document in PolyPublie and at official publisher
Open Access to the full text of this document
Published Version
Terms of Use: Creative Commons Attribution
Download (4MB)
Show abstract
Hide abstract


Ground coupled heat pumps are a notoriously efficient system for heating and cooling buildings. Sometimes the characteristics of the building and the user's needs are such that the amount of heat extracted from the ground during the winter season can be considerably different from the amount injected in summer. This situation can cause a progressive cooling or heating of the ground with a negative effect on the energy efficiency and correct operation of the system. In these cases, an accurate sizing has to be done. In systems already built, it could be necessary to intervene a posteriori to remedy an excessive ground thermal drift due to the energy unbalance. In this work, such a situation relating to a real office building in Italy is investigated and several solutions are examined, one of which has been then implemented. In particular, a hybrid heat pump using as heat sink both the ground and external air is compared with common solutions through computer simulations using a dedicated numerical model, which has also been compared with monitoring data. As a result, the hybrid heat pump shows better performance and limits the thermal drift of the ground temperature.

Uncontrolled Keywords

ground source heat pump; heat pump; hybrid systems; dual source heat pump; EnergyPlus; borehole heat exchanger; HVAC retrofit

Subjects: 1400 Mining and mineral processing > 1400 Mining and mineral processing
1400 Mining and mineral processing > 1401 Mining engineering
2300 Fuel and energy technology > 2303 Other sources of energy (solar, wind, etc.)
Department: Department of Civil, Geological and Mining Engineering
PolyPublie URL: https://publications.polymtl.ca/9382/
Journal Title: Energies (vol. 13, no. 21)
Publisher: MDPI
DOI: 10.3390/en13215680
Official URL: https://doi.org/10.3390/en13215680
Date Deposited: 05 Dec 2022 17:04
Last Modified: 12 May 2023 01:31
Cite in APA 7: Zarrella, A., Zecchin, R., Pasquier, P., Guzzon, D., Prataviera, E., Vivian, J., De Carli, M., & Emmi, G. (2020). Analysis of Retrofit Solutions of a Ground Source Heat Pump System: An Italian Case Study. Energies, 13(21), 19 pages. https://doi.org/10.3390/en13215680


Total downloads

Downloads per month in the last year

Origin of downloads


Repository Staff Only

View Item View Item