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Accuracy of CFD for predicting pressure losses in HVAC duct fittings

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  • Shao, L.
  • Riffat, S. B.

Abstract

The available data from ASHRAE and CIBSE on pressure losses in HVAC duct fittings are of unsatisfactory accuracy and insufficient quantity, which may lead to inaccurate sizing and poor energy efficiencies in air supply systems. This situation is receiving increasing international attention and much effort is being spent in its rectification, especially using computation fluid dynamics (CFD). This paper presents an investigation of the accuracy of the CFD approach. It was found that the combination of the k-[var epsilon] model and the higher order QUICK scheme produces the highest accuracy (with a relative error of 10%). Grid dependency tests showed that a relatively low grid density in the straight sections upstream/downstream of the duct fitting is sufficient but a higher density in the duct axis direction is required in the section containing the duct fitting. In addition, a computational domain set-up with short upstream/downstream sections is adequate. The examination of CFD accuracy and its maximisation should be extended to other fittings. This paper illustrates the important factors involved and the procedures to follow.

Suggested Citation

  • Shao, L. & Riffat, S. B., 1995. "Accuracy of CFD for predicting pressure losses in HVAC duct fittings," Applied Energy, Elsevier, vol. 51(3), pages 233-248.
    • Handle: RePEc:eee:appene:v:51:y:1995:i:3:p:233-248
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    Cited by:

    1. Mumma, Stanley A. & Mahank, Thomas A. & Ke, Yu-Pei, 1998. "Analytical determination of duct fitting loss-coefficients," Applied Energy, Elsevier, vol. 61(4), pages 229-247, December.
    2. Konrad Nering & Krzysztof Nering, 2021. "Validation of Modified Algebraic Model during Transitional Flow in HVAC Duct," Energies, MDPI, vol. 14(13), pages 1-20, July.
    3. Wang, Yang & Zhao, Fu-Yun & Kuckelkorn, Jens & Spliethoff, Hartmut & Rank, Ernst, 2014. "School building energy performance and classroom air environment implemented with the heat recovery heat pump and displacement ventilation system," Applied Energy, Elsevier, vol. 114(C), pages 58-68.

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