A fast approximate method for simulating thermal pile heat exchangers
(2022) In Geomechanics for Energy and the Environment 32.- Abstract
- Ground source heat pump systems, operating in conjunction with vertical ground heat exchangers, will play a key role in decarbonising heating and cooling of buildings. Design of traditional borehole heat exchangers relies on tools which implement routine analytical relationships between heat transferred and the temperature change in the ground and circulating thermal fluid. However, for novel piled foundations used as ground heat exchangers, there are few such analytical solutions available that are practical for routine implementation. This paper examines the use of a radial approximation to simulate the dynamic thermal behaviour of pile heat-exchangers. Originally developed for small diameter and high aspect ratio borehole heat... (More)
- Ground source heat pump systems, operating in conjunction with vertical ground heat exchangers, will play a key role in decarbonising heating and cooling of buildings. Design of traditional borehole heat exchangers relies on tools which implement routine analytical relationships between heat transferred and the temperature change in the ground and circulating thermal fluid. However, for novel piled foundations used as ground heat exchangers, there are few such analytical solutions available that are practical for routine implementation. This paper examines the use of a radial approximation to simulate the dynamic thermal behaviour of pile heat-exchangers. Originally developed for small diameter and high aspect ratio borehole heat exchangers, the approach is more challenging for piles since unsteady heat transfer within the pile material is more significant over typical timescales. Nonetheless, we demonstrate that for pile diameters between 300 mm and 1200 mm, generally the error is <1oC with centrally placed heat transfer pipes or four or more pipes placed near the edge with circumferential spacing less than 550 mm. The radial model is therefore practical for most pile configurations. The strong performance of the model is demonstrated for a year of hypothetical heating and cooling cycles, and also against a field-scale thermal response test. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/b1cc1799-fe6d-4ff6-a066-1cd10fe9e884
- author
- Loveridge, Fleur ; Woodman, Nicholas ; Javed, Saqib LU and Claesson, Johan LU
- organization
- publishing date
- 2022-12
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Geomechanics for Energy and the Environment
- volume
- 32
- article number
- 100368
- pages
- 29 pages
- publisher
- Elsevier
- external identifiers
-
- scopus:85133563986
- ISSN
- 2352-3808
- DOI
- 10.1016/j.gete.2022.100368
- language
- English
- LU publication?
- yes
- id
- b1cc1799-fe6d-4ff6-a066-1cd10fe9e884
- date added to LUP
- 2022-06-16 22:50:08
- date last changed
- 2023-01-04 13:18:06
@article{b1cc1799-fe6d-4ff6-a066-1cd10fe9e884,
abstract = {{Ground source heat pump systems, operating in conjunction with vertical ground heat exchangers, will play a key role in decarbonising heating and cooling of buildings. Design of traditional borehole heat exchangers relies on tools which implement routine analytical relationships between heat transferred and the temperature change in the ground and circulating thermal fluid. However, for novel piled foundations used as ground heat exchangers, there are few such analytical solutions available that are practical for routine implementation. This paper examines the use of a radial approximation to simulate the dynamic thermal behaviour of pile heat-exchangers. Originally developed for small diameter and high aspect ratio borehole heat exchangers, the approach is more challenging for piles since unsteady heat transfer within the pile material is more significant over typical timescales. Nonetheless, we demonstrate that for pile diameters between 300 mm and 1200 mm, generally the error is <1oC with centrally placed heat transfer pipes or four or more pipes placed near the edge with circumferential spacing less than 550 mm. The radial model is therefore practical for most pile configurations. The strong performance of the model is demonstrated for a year of hypothetical heating and cooling cycles, and also against a field-scale thermal response test.}},
author = {{Loveridge, Fleur and Woodman, Nicholas and Javed, Saqib and Claesson, Johan}},
issn = {{2352-3808}},
language = {{eng}},
publisher = {{Elsevier}},
series = {{Geomechanics for Energy and the Environment}},
title = {{A fast approximate method for simulating thermal pile heat exchangers}},
url = {{http://dx.doi.org/10.1016/j.gete.2022.100368}},
doi = {{10.1016/j.gete.2022.100368}},
volume = {{32}},
year = {{2022}},
}