Some aspects of controlling radiant and convective cooling systems

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceeding


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%.


  • Taha Arghand
  • Jan Olof Dalenbäck
  • Anders Trüschel
  • Saqib Javed
External organisations
  • Chalmers University of Technology
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Building Technologies
Original languageEnglish
Title of host publicationE3S Web of Conferences
EditorsS.I Tanabe, H. Zhang, J. Kurnitski, M.C. Gameiro da Silva, I. Nastase, P. Wargocki, G. Cao, L. Mazzarela, C. Inard
Place of PublicationLes Ulis
PublisherEDP Sciences
Number of pages7
Publication statusPublished - 2019 Aug 13
Publication categoryResearch
Externally publishedYes
Event13th REHVA World Congress, CLIMA 2019 - Bucharest, Romania
Duration: 2019 May 262019 May 29

Publication series

NameE3S Web of Conferences
PublisherEDP Sciences
ISSN (Print)2555-0403


Conference13th REHVA World Congress, CLIMA 2019