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Control methods for a direct-ground cooling system : An experimental study on office cooling with ground-coupled ceiling cooling panels

Arghand, Taha; Javed, Saqib LU ; Trüschel, Anders and Dalenbäck, Jan Olof (2019) In Energy and Buildings 197. p.47-56
Abstract

This article experimentally investigates the performance of two control methods (the supply water temperature method and the water flow control method)for a direct-ground cooling system. The control methods were implemented through three types of indoor feedback controllers: 1)an on/off controller, 2)an on/off controller with a deadband and 3)P controller. The performances of the control methods were evaluated regarding room temperature stability and pump energy use. Ceiling cooling panels were employed to keep the test room air temperature at 25.0 °C under periodic heat gain conditions. The cooling system used a ground heat exchanger with a U-pipe in an 80-meter-deep borehole as a cooling source. The findings show that room air... (More)

This article experimentally investigates the performance of two control methods (the supply water temperature method and the water flow control method)for a direct-ground cooling system. The control methods were implemented through three types of indoor feedback controllers: 1)an on/off controller, 2)an on/off controller with a deadband and 3)P controller. The performances of the control methods were evaluated regarding room temperature stability and pump energy use. Ceiling cooling panels were employed to keep the test room air temperature at 25.0 °C under periodic heat gain conditions. The cooling system used a ground heat exchanger with a U-pipe in an 80-meter-deep borehole as a cooling source. The findings show that room air temperature was maintained close to the set-point with both control methods, but it was more stable with the temperature control method. In addition, condensation risk was easily preventable with the temperature control method. A parametric study showed that pump energy use when using two-position controllers could be as low as when using modulating controllers if the on-state flow rate of the circulating pump is selected in relation to the ground temperature and heat transfer characteristics of the heat exchanger.

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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Control methods, Controller, Direct-ground cooling, Energy performance, High-temperature cooling, Radiant ceiling panel
in
Energy and Buildings
volume
197
pages
10 pages
publisher
Elsevier
external identifiers
  • scopus:85066077080
ISSN
0378-7788
DOI
10.1016/j.enbuild.2019.05.049
language
English
LU publication?
no
id
08cae2de-c0aa-45b9-a2ff-1737789d2cd0
date added to LUP
2019-06-06 10:43:19
date last changed
2019-07-02 04:47:27
@article{08cae2de-c0aa-45b9-a2ff-1737789d2cd0,
  abstract     = {<p>This article experimentally investigates the performance of two control methods (the supply water temperature method and the water flow control method)for a direct-ground cooling system. The control methods were implemented through three types of indoor feedback controllers: 1)an on/off controller, 2)an on/off controller with a deadband and 3)P controller. The performances of the control methods were evaluated regarding room temperature stability and pump energy use. Ceiling cooling panels were employed to keep the test room air temperature at 25.0 °C under periodic heat gain conditions. The cooling system used a ground heat exchanger with a U-pipe in an 80-meter-deep borehole as a cooling source. The findings show that room air temperature was maintained close to the set-point with both control methods, but it was more stable with the temperature control method. In addition, condensation risk was easily preventable with the temperature control method. A parametric study showed that pump energy use when using two-position controllers could be as low as when using modulating controllers if the on-state flow rate of the circulating pump is selected in relation to the ground temperature and heat transfer characteristics of the heat exchanger.</p>},
  author       = {Arghand, Taha and Javed, Saqib and Trüschel, Anders and Dalenbäck, Jan Olof},
  issn         = {0378-7788},
  keyword      = {Control methods,Controller,Direct-ground cooling,Energy performance,High-temperature cooling,Radiant ceiling panel},
  language     = {eng},
  month        = {08},
  pages        = {47--56},
  publisher    = {Elsevier},
  series       = {Energy and Buildings},
  title        = {Control methods for a direct-ground cooling system : An experimental study on office cooling with ground-coupled ceiling cooling panels},
  url          = {http://dx.doi.org/10.1016/j.enbuild.2019.05.049},
  volume       = {197},
  year         = {2019},
}