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A variable speed water-to-water heat pump model used for ground-source applications

Geoffrey Viviescas and Michel Bernier

Article (2024)

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Abstract

The main objective of this study is to model variable speed water-to-water heat pumps (VSHP) and to examine the impact of the operation of such devices on ground heat exchanger sizing and energy consumption when they are used in ground-source applications.

In the first part of the paper, a complete physics-based steady-state model of a variable-speed water-to-water heat pump is briefly presented. A performance map approach is also used by modifying an existing TRNSYS variable speed heat pump model to provide a minimum speed of operation and a better representation at part load.

Simulation results over a heating season on a residential ground source VSHP indicate that the energy coverage (i.e. percentage of annual heat supplied by the heat pump) increases at a faster rate than the effect coverage (i.e. percentage of peak building heat supplied by the heat pump) for a small value of the effect coverage. For example, for an effect coverage of 60%, the energy coverage is ∼ 93%. It is also shown that the normalized length of the ground heat exchanger varies linearly up to an effect coverage of 60% where it is equal to 75% of the value encountered for an effect coverage of 100%.

Uncontrolled Keywords

water-to-water heat pump; variable speed compressor; performance map; modelling

Subjects: 2100 Mechanical engineering > 2100 Mechanical engineering
2100 Mechanical engineering > 2105 Hydraulics
2100 Mechanical engineering > 2107 Modelling, simulation and finite element methods
Department: Department of Mechanical Engineering
Funders: CRSNG / NSERC
Grant number: RGPIN-2019-06961
PolyPublie URL: https://publications.polymtl.ca/56992/
Journal Title: Science and Technology for the Built Environment (vol. 30, no. 3)
Publisher: Taylor & Francis
DOI: 10.1080/23744731.2023.2295822
Official URL: https://doi.org/10.1080/23744731.2023.2295822
Date Deposited: 20 Dec 2023 15:06
Last Modified: 08 Apr 2024 15:34
Cite in APA 7: Viviescas, G., & Bernier, M. (2024). A variable speed water-to-water heat pump model used for ground-source applications. Science and Technology for the Built Environment, 30(3), 266-279. https://doi.org/10.1080/23744731.2023.2295822

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