I'm French and here we do not use many methods Ashrae.
I have a question about the coefficients K.
I need to do a family that has a valve with two reducer in the same family.
So I have 3 coefficients K. I can do, addition them?
I feel that your factor K are the equivalent of our coefficients Z (zeta) but I'm not sure. And we can do addition with coefficients Z.
Thank you for your answers.
Iam working pressure drop calculation in 2015 version, its good & i am getting almost the same as manual one.
please look into the fittings family and the values which is giving.
Eg: for duct elbow u have soo many option like with/wihout vanes. so use the same(SR3-3) one as u r using in manual (SR3-3)calculation.
Some of my duct fittings have no pressure loss value. When I try to check to see which ASHRAE table it is using, the table choices are blank. On the same System, I have the exact same fitting (different size) and it works fine. What can cause this and how can I correct it?
On this same System, the CFMs are totaling up from the Air Terminals to the Mechanical Equipment. However, some of the ducts are not tallying the CFM and are thus not calculating a pressure loss.
The tables have set sizes they work for. If the size of the fitting is outside the range of the table then you don't get a pressure loss. Therefore you need to either chang ethe fitting type or interpolate the value and manually add it into the properties.
Alternatively you could edit the xml file for the Ashrae fittings but that could cause you problems if you enter the information wrong.