EnergyProfessional
Mechanical
- Jan 20, 2010
- 1,279
I have the SMACNA "HVAC Systems Duct Design Guide" That includes a good explanation and also duct fitting loss coefficient numbers. There are also free guides, like from McGill
But I wanted to compare what SMACNA says to what ASHRAE recommends. I use Revit for design and that allegedly uses the ASHRAE tables. Since Revit doesn't do that well, I wanted to compare to a manual calculation with the ASHRAE fittings. Problem is, I only find metric data and wonder if there is a conversion from SI duct fitting loss coefficients to IP?
I also wonder if buying the ASHRAE duct Design Guide is worthwhile or if it just duplicates what I already have in SMACNA. They don't have a published table of content or a "preview" (like Amazon has). It also isn't clear if that includes the Fitting database. they sell the duct fitting database separately and it seems to be a subscription. I really just want to see some of the ASHRAE fittings REvit uses and verify it calculates pressured rop correctly. So I don't want to buy it all if I don't have to.
And if there are differences between the ASHRAE and SMACNA duct fitting values, which is better or more correct?
But I wanted to compare what SMACNA says to what ASHRAE recommends. I use Revit for design and that allegedly uses the ASHRAE tables. Since Revit doesn't do that well, I wanted to compare to a manual calculation with the ASHRAE fittings. Problem is, I only find metric data and wonder if there is a conversion from SI duct fitting loss coefficients to IP?
I also wonder if buying the ASHRAE duct Design Guide is worthwhile or if it just duplicates what I already have in SMACNA. They don't have a published table of content or a "preview" (like Amazon has). It also isn't clear if that includes the Fitting database. they sell the duct fitting database separately and it seems to be a subscription. I really just want to see some of the ASHRAE fittings REvit uses and verify it calculates pressured rop correctly. So I don't want to buy it all if I don't have to.
And if there are differences between the ASHRAE and SMACNA duct fitting values, which is better or more correct?