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The use of ducts to improve the control of supply air temperature rise in UFAD systems: CFD and lab study

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  • Pasut, Wilmer
  • Bauman, Fred
  • De Carli, Michele

Abstract

Cool supply air flowing through the underfloor plenum is exposed to heat gain from both the concrete slab (conducted from the warm return air on the adjacent floor below the slab) and the raised floor panels (conducted from the warmer room above). The magnitude of this heat gain can be quite high, resulting in undesirable loss of control of the supply air temperature from the plenum into the occupied space. These warmer supply air temperatures can make it more difficult to maintain comfort in the occupied space (without increasing airflow rates), particularly in perimeter zones where cooling loads reach their highest levels. How to predict plenum thermal performance is one of the key design issues facing practicing engineers – evidence from completed projects indicates that excessive temperature rise in the plenum can be a problem.

Suggested Citation

  • Pasut, Wilmer & Bauman, Fred & De Carli, Michele, 2014. "The use of ducts to improve the control of supply air temperature rise in UFAD systems: CFD and lab study," Applied Energy, Elsevier, vol. 134(C), pages 490-498.
    • Handle: RePEc:eee:appene:v:134:y:2014:i:c:p:490-498
    DOI: 10.1016/j.apenergy.2014.08.002
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    Citations

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    Cited by:

    1. Chul-Ho Kim & Seung-Eon Lee & Kwang-Ho Lee & Kang-Soo Kim, 2019. "Detailed Comparison of the Operational Characteristics of Energy-Conserving HVAC Systems during the Cooling Season," Energies, MDPI, vol. 12(21), pages 1-29, October.
    2. Hou, Falin & Shen, Chenhui & Cheng, Qing, 2022. "Research on a new optimization method for airflow organization in breeding air conditioning with perforated ceiling ventilation," Energy, Elsevier, vol. 254(PB).
    3. Chul-Ho Kim & Seung-Eon Lee & Kang-Soo Kim, 2018. "Analysis of Energy Saving Potential in High-Performance Building Technologies under Korean Climatic Conditions," Energies, MDPI, vol. 11(4), pages 1-34, April.
    4. Nina Szczepanik-Scislo, 2022. "Improving Household Safety via a Dynamic Air Terminal Device in Order to Decrease Carbon Monoxide Migration from a Gas Furnace," IJERPH, MDPI, vol. 19(3), pages 1-11, February.
    5. Nina Szczepanik-Scislo & Jacek Schnotale, 2020. "An Air Terminal Device with a Changing Geometry to Improve Indoor Air Quality for VAV Ventilation Systems," Energies, MDPI, vol. 13(18), pages 1-20, September.

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