Journal
ENERGY AND BUILDINGS
Volume 202, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.enbuild.2019.109343
Keywords
DX-GSHP; Borehole heat exchanger; Internal heat exchanger; Ground surface temperature; CO2; Transient simulation
Funding
- Office of Energy Research and Development (OERD) of Canada through the Energy Innovation Program (EIP) [EU-BE-22]
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In this work, the influence of an internal heat exchanger (IHE) on the operation of a CO 2 direct expansion ground source heat pump (DX-GSHP) was assessed through transient energy simulations. A previous theoretical model was extended to account for an IHE, and was used to evaluate the performance of DX-GSHP systems under various controls, ground conditions and building loads. A showcase of the benefit of integrating an IHE to the DX-GSHP was carried out, through 4-month heating energy simulations period of a small residential building located in Canada, under 4 different cases. Results show that adding an IHE to the system effectively counters the effect of thermal short-circuiting in the borehole as well as ground surface temperature variations, and thereby increases its efficiency. Crown Copyright (C) 2019 Published by Elsevier B.V. All rights reserved.
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