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Dynamic thermal performance of horizontal ground source heat pumps - The impact of coupled heat and moisture transfer

Gan, Guohui

Authors

GUOHUI GAN guohui.gan@nottingham.ac.uk
Associate Professor



Abstract

A ground heat exchanger is a key component of a ground source heat pump system, and heat and moisture transfer occurs simultaneously in soil with a horizontal ground heat exchanger in operation. A new method has been developed to generate moisture and temperature profiles in soil with spatially and temporally varying properties. The profiles are used as initial data for accurate solution of the equations for transient heat and moisture transfer in soil containing a buried horizontal ground heat exchanger. The impacts of initial conditions of soil and coupled heat and moisture transfer are assessed on the thermal performance of a horizontal ground heat exchanger for a ground source heat pump for different installation depths and soil textures. Seasonal heat transfer through a horizontal heat exchanger increases with installation depth and a heat exchanger installed at 2 m deep can transfer 19% more heat than that at 1 m deep. Heat transfer in sandy soil is 17% higher than in loamy sand soil which is 14.5% higher than in clay loam soil. The maximum differences between models with and without moisture transfer for the prediction of heat transfer through a heat exchanger are 24%, 17% and 18% in clay sand, loamy sand and sandy soils, respectively. In conclusion, it is necessary to use a coupled heat and moisture transfer model in order to predict accurately the seasonal thermal performance of a ground heat exchanger in shallow ground.

Journal Article Type Article
Publication Date Jun 1, 2018
Journal Energy
Print ISSN 0360-5442
Electronic ISSN 1873-6785
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 152
APA6 Citation Gan, G. (2018). Dynamic thermal performance of horizontal ground source heat pumps - The impact of coupled heat and moisture transfer. Energy, 152, https://doi.org/10.1016/j.energy.2018.04.008
DOI https://doi.org/10.1016/j.energy.2018.04.008
Keywords Ground heat exchanger; heat and moisture transfer; ground-source heat pump; seasonal performance; spatiotemporal variation; soil properties
Publisher URL https://www.sciencedirect.com/science/article/pii/S036054421830598X
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0





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