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CFD analysis of deformed ducts in residential HVAC ducts.

Number: pap. 703

Author(s) : MOUJAES S., SELVARAJ D.

Summary

CFD models were created, using STAR-CD, to simulate fluid flow in ducts that are deformed due to constrictions during installation. Four different duct runs with deformations were modeled that have been observed in residential HVAC ducts. Reynolds numbers are varied to simulate a variety of flow conditions. The computer code was used to produce pressure drop data along the deformation of the duct. Pressure loss coefficients for the deformed and non-deformed duct runs were calculated from the predicted pressure drop data. The results showed that there was a decrease in the pressure loss coefficient as the Reynolds number increased. Also there was an increase in pressure drop coefficients for deformed ducts over the non-deformed ducts for the same Reynolds number. The pressure loss coefficient also decreased when the amount of flow in the branch as a percentage of inlet flow was increased. A correlation as a function of Reynolds number and the percentage of air flow is introduced to obtain the pressure loss coefficients in a wye fitting. The study shows the importance of trying to maintain these duct systems as straight as possible and as free of these deformations as could be since these improper installations can increase the pressure drop in the overall system unnecessarily.

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Pages: 11 p.

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Details

  • Original title: CFD analysis of deformed ducts in residential HVAC ducts.
  • Record ID : 30009614
  • Languages: English
  • Source: Clima 2013. 11th REHVA World Congress and 8th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings.
  • Publication date: 2013/06/16

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