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Cooling of office buildings in cold climates using direct ground-coupled active chilled beams

Arghand, Taha ; Javed, Saqib LU ; Trüschel, Anders and Dalenbäck, Jan Olof (2021) In Renewable Energy 164. p.122-132
Abstract

This study investigates the use of a direct ground cooling system (DGCS) using active chilled beams for the cooling of office buildings in Sweden. The methodology of the study entails laboratory experiments to develop and validate a simulation model of the cooling system. The sensitivity of the input parameters, such as borehole heat exchanger (BHE) length, internal heat gains and room temperature set point, are studied with respect to BHE outlet fluid temperature and room thermal comfort. The results provide a practical insight into designing DGCSs with regard to borehole outlet fluid temperatures. The results also show that the thermal comfort criteria in the room are met by applying the DGCS even under the most critical design... (More)

This study investigates the use of a direct ground cooling system (DGCS) using active chilled beams for the cooling of office buildings in Sweden. The methodology of the study entails laboratory experiments to develop and validate a simulation model of the cooling system. The sensitivity of the input parameters, such as borehole heat exchanger (BHE) length, internal heat gains and room temperature set point, are studied with respect to BHE outlet fluid temperature and room thermal comfort. The results provide a practical insight into designing DGCSs with regard to borehole outlet fluid temperatures. The results also show that the thermal comfort criteria in the room are met by applying the DGCS even under the most critical design conditions of undisturbed ground temperature and internal heat gains. The sensitivity study quantifies the influence of the room temperature setpoint and internal heat gain intensity on the BHE length. The BHE outlet temperature level is more sensitive in shorter BHEs than in the longer ones, and BHE length and room temperature levels are highly correlated. Thus, the sizing of DGCS can benefit from a control system to allow the room temperature to float within a certain range.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Active chilled beam, Borehole heat exchanger, Design optimisation, Direct ground cooling system, High-temperature cooling
in
Renewable Energy
volume
164
pages
11 pages
publisher
Elsevier
external identifiers
  • scopus:85091255970
ISSN
0960-1481
DOI
10.1016/j.renene.2020.09.066
language
English
LU publication?
yes
id
0fd011c3-0d6e-4797-99a0-2d2f9be9b703
date added to LUP
2020-12-10 16:13:54
date last changed
2020-12-21 13:05:37
@article{0fd011c3-0d6e-4797-99a0-2d2f9be9b703,
  abstract     = {<p>This study investigates the use of a direct ground cooling system (DGCS) using active chilled beams for the cooling of office buildings in Sweden. The methodology of the study entails laboratory experiments to develop and validate a simulation model of the cooling system. The sensitivity of the input parameters, such as borehole heat exchanger (BHE) length, internal heat gains and room temperature set point, are studied with respect to BHE outlet fluid temperature and room thermal comfort. The results provide a practical insight into designing DGCSs with regard to borehole outlet fluid temperatures. The results also show that the thermal comfort criteria in the room are met by applying the DGCS even under the most critical design conditions of undisturbed ground temperature and internal heat gains. The sensitivity study quantifies the influence of the room temperature setpoint and internal heat gain intensity on the BHE length. The BHE outlet temperature level is more sensitive in shorter BHEs than in the longer ones, and BHE length and room temperature levels are highly correlated. Thus, the sizing of DGCS can benefit from a control system to allow the room temperature to float within a certain range.</p>},
  author       = {Arghand, Taha and Javed, Saqib and Trüschel, Anders and Dalenbäck, Jan Olof},
  issn         = {0960-1481},
  language     = {eng},
  pages        = {122--132},
  publisher    = {Elsevier},
  series       = {Renewable Energy},
  title        = {Cooling of office buildings in cold climates using direct ground-coupled active chilled beams},
  url          = {http://dx.doi.org/10.1016/j.renene.2020.09.066},
  doi          = {10.1016/j.renene.2020.09.066},
  volume       = {164},
  year         = {2021},
}