Hevacomp k-factors for Ductwork Ancillaries

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.

Thanks for the swift reply Shane,

Could you please confirm what k factors hevacomp uses specifically for ancillary fittings like bends (mitre, mitre with vanes, radiused),  tees, shoe branches, etc)?

The link provided makes no reference to k factors for ductwork ancillary fittings. Basically the figures generated from the Netsys calculation are being QA'd, and we want to be able to do some sanity checks on k factor allowances for bends, tees, etc.

Any help will be appreciated.

Regards

Eugene.

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.

Thanks for the help so far Shane.

Apologies for being a pest but it does say in the manual that k factors are used within the software for duct bends and tees. Are able to give an indication of the figures used?

Note the manual mentions CIBSE Guide 2001, I presume it is guide C the manual is referring to?

Hi Eugene - Yes. Its CIBSE Guide C.

Regards,

Thanks for the help guys! Thanks in particular for the prompt responses!

Thanks for the help guys! Thanks in particular for the prompt responses!