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Some aspects of controlling radiant and convective cooling systems

Arghand, Taha ; Dalenbäck, Jan Olof ; Trüschel, Anders and Javed, Saqib LU (2019) 13th REHVA World Congress, CLIMA 2019 In E3S Web of Conferences 111.
Abstract

Designing appropriate control systems for radiant heating and cooling terminals entails an understanding of their dynamic behaviour. This study experimentally investigates the dynamic response of a room with convective and radiant cooling systems. The experiments were performed in a 12.6 m2 large test room outfitted as a single-office room. The main cooling system was radiant ceiling panels which covered 70% of the ceiling area. The thermal performance of the radiant system was compared to that of a fan-coil unit (FCU). The results from the step response test showed that the time constant of the room for the radiant system was shorter than for the convective one, indicating faster changes in room temperature by the radiant... (More)

Designing appropriate control systems for radiant heating and cooling terminals entails an understanding of their dynamic behaviour. This study experimentally investigates the dynamic response of a room with convective and radiant cooling systems. The experiments were performed in a 12.6 m2 large test room outfitted as a single-office room. The main cooling system was radiant ceiling panels which covered 70% of the ceiling area. The thermal performance of the radiant system was compared to that of a fan-coil unit (FCU). The results from the step response test showed that the time constant of the room for the radiant system was shorter than for the convective one, indicating faster changes in room temperature by the radiant system. Furthermore, controlling the FCU with similar control system tuned for ceiling panels increased the hysteresis gap in the room air temperature from 0.4 K to 0.8 K. This indicates that control systems for low-mass radiant systems and convective systems might be applied to each other, but on-site tuning is required to omit the offset (persistent error). In this study, controlling room temperature with ceiling panels did not benefit from using an operative temperature sensor to provide feedback signal to the control system. However, the pump energy use was moderately decreased by 14%.

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Please use this url to cite or link to this publication:
author
; ; and
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
host publication
E3S Web of Conferences
series title
E3S Web of Conferences
editor
Tanabe, S.I ; Zhang, H. ; Kurnitski, J. ; Gameiro da Silva, M.C. ; Nastase, I. ; Wargocki, P. ; Cao, G. ; Mazzarela, L. and Inard, C.
volume
111
pages
7 pages
publisher
EDP Sciences
conference name
13th REHVA World Congress, CLIMA 2019
conference location
Bucharest, Romania
conference dates
2019-05-26 - 2019-05-29
external identifiers
  • scopus:85071853092
ISSN
2555-0403
DOI
10.1051/e3sconf/201911105008
language
English
LU publication?
no
id
0f6a5151-bc3c-4f17-a7e8-57d7aaa03939
date added to LUP
2019-10-18 09:51:42
date last changed
2020-12-29 04:29:15
@inproceedings{0f6a5151-bc3c-4f17-a7e8-57d7aaa03939,
  abstract     = {<p>Designing appropriate control systems for radiant heating and cooling terminals entails an understanding of their dynamic behaviour. This study experimentally investigates the dynamic response of a room with convective and radiant cooling systems. The experiments were performed in a 12.6 m<sup>2</sup> large test room outfitted as a single-office room. The main cooling system was radiant ceiling panels which covered 70% of the ceiling area. The thermal performance of the radiant system was compared to that of a fan-coil unit (FCU). The results from the step response test showed that the time constant of the room for the radiant system was shorter than for the convective one, indicating faster changes in room temperature by the radiant system. Furthermore, controlling the FCU with similar control system tuned for ceiling panels increased the hysteresis gap in the room air temperature from 0.4 K to 0.8 K. This indicates that control systems for low-mass radiant systems and convective systems might be applied to each other, but on-site tuning is required to omit the offset (persistent error). In this study, controlling room temperature with ceiling panels did not benefit from using an operative temperature sensor to provide feedback signal to the control system. However, the pump energy use was moderately decreased by 14%.</p>},
  author       = {Arghand, Taha and Dalenbäck, Jan Olof and Trüschel, Anders and Javed, Saqib},
  booktitle    = {E3S Web of Conferences},
  editor       = {Tanabe, S.I and Zhang, H. and Kurnitski, J. and Gameiro da Silva, M.C. and Nastase, I. and Wargocki, P. and Cao, G. and Mazzarela, L. and Inard, C.},
  issn         = {2555-0403},
  language     = {eng},
  month        = {08},
  publisher    = {EDP Sciences},
  series       = {E3S Web of Conferences},
  title        = {Some aspects of controlling radiant and convective cooling systems},
  url          = {http://dx.doi.org/10.1051/e3sconf/201911105008},
  doi          = {10.1051/e3sconf/201911105008},
  volume       = {111},
  year         = {2019},
}