Dynamic thermal simulation of horizontal ground heat exchangers for renewable heating and ventilation of buildings

Gan, Guohui (2016) Dynamic thermal simulation of horizontal ground heat exchangers for renewable heating and ventilation of buildings. Renewable Energy, 103 . pp. 361-371. ISSN 1879-0682

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Abstract

A ground heat exchanger is used to transfer thermal energy stored in soil in order to provide renewable heating, cooling and ventilation of a building. A computer program has been developed for simulation of the dynamic thermal performance of horizontally coupled earth-liquid heat exchanger for a ground source heat pump and earth-air heat exchanger for building ventilation. Neglecting the dynamic interactions between a heat exchanger and environments would significantly over predict its thermal performance and in terms of the amount of daily heat transfer the level of over-prediction could be as much as 463% for an earth-liquid heat exchanger and more than 100% for an earth-air heat exchanger. The daily heat transfer increases with soil moisture and for an earth-liquid heat exchanger the increase is between 3% and 35% with increase in moisture from 0.22 to 0.3 m3/m3 depending on the magnitude of heat transfer. Heat transfer through a plastic earth-liquid heat exchanger can be increased by 10%–12% if its thermal properties are improved to the same as surrounding soil. The increase is smaller between 2% and 4% for an earth-air heat exchanger. In addition, an earth-liquid heat exchanger is more efficient than an earth-air heat exchanger.

Item Type: Article
Keywords: Ground heat exchanger; Heat and moisture transfer; Ground-source heat pump; Earth-air ventilation; Dynamic interaction
Schools/Departments: University of Nottingham, UK > Faculty of Engineering > Department of Architecture and Built Environment
Identification Number: 10.1016/j.renene.2016.11.052
Depositing User: Eprints, Support
Date Deposited: 25 Nov 2016 15:34
Last Modified: 18 Oct 2017 17:50
URI: http://eprints.nottingham.ac.uk/id/eprint/38978

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