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Performance analysis of an integrated UFAD and radiant hydronic slab system

Author

Listed:
  • Raftery, Paul
  • Lee, Kwang Ho
  • Webster, Tom
  • Bauman, Fred

Abstract

In this paper, an EnergyPlus model was used to simulate the operation of a novel integrated HVAC system. This system combines an underfloor air distribution system with a cooled radiant ceiling slab. A cooling tower supplies water to pre-cool the structural slabs during the night and early morning period. The paper compares the performance of this system to both a typical overhead system and a typical UFAD system in the cooling season for the Sacramento, California climate. When compared to the overhead system, the integrated UFAD/Radiant system shows a 22–23% reduction in total energy consumption during the peak cooling months (June to August) and a 31% reduction in peak hourly electricity demand. When compared to the UFAD system, these reductions are 21–22% and 24% respectively. An investigation of the simulation results showed that the integrated UFAD/Radiant system also improves occupant thermal comfort and reduces thermal decay issues in the underfloor plenum.

Suggested Citation

  • Raftery, Paul & Lee, Kwang Ho & Webster, Tom & Bauman, Fred, 2012. "Performance analysis of an integrated UFAD and radiant hydronic slab system," Applied Energy, Elsevier, vol. 90(1), pages 250-257.
    • Handle: RePEc:eee:appene:v:90:y:2012:i:1:p:250-257
    DOI: 10.1016/j.apenergy.2011.02.014
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    Cited by:

    1. Schmelas, Martin & Feldmann, Thomas & Bollin, Elmar, 2017. "Savings through the use of adaptive predictive control of thermo-active building systems (TABS): A case study," Applied Energy, Elsevier, vol. 199(C), pages 294-309.
    2. Bojić, Milorad & Cvetković, Dragan & Bojić, Ljubiša, 2015. "Decreasing energy use and influence to environment by radiant panel heating using different energy sources," Applied Energy, Elsevier, vol. 138(C), pages 404-413.
    3. Heidenthaler, Daniel & Leeb, Markus & Schnabel, Thomas & Huber, Hermann, 2021. "Comparative analysis of thermally activated building systems in wooden and concrete structures regarding functionality and energy storage on a simulation-based approach," Energy, Elsevier, vol. 233(C).
    4. Ibrahim, Mohamad & Wurtz, Etienne & Biwole, Pascal Henry & Achard, Patrick, 2014. "Transferring the south solar energy to the north facade through embedded water pipes," Energy, Elsevier, vol. 78(C), pages 834-845.
    5. Lim, Jae-Han & Song, Jin-Hee & Song, Seung-Yeong, 2014. "Development of operational guidelines for thermally activated building system according to heating and cooling load characteristics," Applied Energy, Elsevier, vol. 126(C), pages 123-135.
    6. Wu, Wentao & Zhang, Wei & Benner, Jingru & Malkawi, Ali, 2020. "Critical evaluation of analytical methods for thermally activated building systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 117(C).

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