Hevacomp k-factors for Ductwork Ancillaries

Question

Hello, 
 
 We have completed a pressure drop calculation for ventilation ductwork. For QA purposes, we've been queried on the k factors used for ductwork ancillaries including bends, elbows, tees, branches, etc. 
 Could you please clarify the k-factors Hevacomp uses for ductwork ancilliaries? 
 
 Thanks 
 Eugene.

Shane Regan · Accepted Answer

Hi Eugene, 
 Standard data is based on that available in CIBSE Guide C. 
 Ductwork sections and bends are not calculated separately, so a breakdown of separate pressure drops / k-values across ductwork/bends is not given by the software, as these are computed hand-in-hand. 
 Additional details of this calculation method can be found in the section of the manual shown below, which should hopefully help to explain this further.

Duncan Brown · Answer

Hi Eugene - Yes. Its CIBSE Guide C. Regards,

Shane Regan · Answer

Hi Eugene, 
 A list of k-factors for the Hevacomp fittings can be found in this article. Info on the pressure drop consideration on outlets can be found here. 
 K-factors for bends and tees are taken from CIBSE Guide C. 
 Please note that the pressure drop result for each section includes the pressure across pipe section and also all fittings associated with that section.

Hevacomp k-factors for Ductwork Ancillaries

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