Experimental assessment and modeling of radiant cooling technology using constant and variable water flow rate

Omar M. Zaki, Mostafa Sadek, Habiba Aly, Omar Abdelaziz

Research output: Contribution to journalArticlepeer-review


The goal of this study is to perform an analysis of the performance of radiant cooling panels using experimental testing and transient system simulation software. The effect of design parameters such as water supply temperature and water flow rate on thermal comfort and energy efficiency is studied. Two control schemes are used in the study in which either the water flow rate or the water temperature difference between the inlet and outlet of radiant panels is held constant. This paper demonstrates the modeling and validation of a radiant cooling system in TRNSYS and uses this model to study the performance of the system during the cooling season in Egypt. It was found that the lower water temperature of 16 °C was found to be suitable for achieving thermal comfort. The constant water flow rate control scheme showed a 5% less unmet hours percentage than the constant water temperature difference, but the latter used 38% less electrical energy. A constant water temperature difference control scheme can achieve better thermal comfort with an unmet hours percentage down to 12.5% by coupling the system with a dehumidification device.
Original languageEnglish (US)
Pages (from-to)1-14
Number of pages14
JournalScience and Technology for the Built Environment
StatePublished - Mar 30 2023
Externally publishedYes

Bibliographical note

KAUST Repository Item: Exported on 2023-05-24
Acknowledged KAUST grant number(s): OSR-2018-3988
Acknowledgements: This work is part of project no. 3988 and this publication is based upon work supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No. OSR-2018-3988.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Environmental Engineering
  • Building and Construction


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