Which (e.g., supply tees, round elbows, or exhaust hoods) do you calculate most often?
When implementing ASHRAE data into your Excel models, keep these critical physics constraints in mind:
If you have a table where rows represent one ratio (like width/height) and columns represent another (like velocity), use this formula structure to pull the exact ashrae duct fitting database excel
Reduces risk of system failure due to incorrect static pressure calculations. :
Which (e.g., supply elbows, tees, or entries) do you use most often? Which (e
ASHRAE tables feature discrete intervals (e.g., aspect ratios of 0.5, 1.0, 2.0). If your actual duct has an aspect ratio of 1.5, you must linearly interpolate between the values. You can write a custom linear interpolation formula in Excel: =Y1 + ((X_User - X1) / (X2 - X1)) * (Y2 - Y1) Use code with caution.
What do you use most often? (e.g., rectangular elbows, round T-junctions) Share public link ASHRAE tables feature discrete intervals (e
ASHRAE does not provide the full raw database as a single Excel file, but there are several ways to use the data within spreadsheets:
Use the Power Query Editor to unpivot multi-dimensional tables into flat, row-by-row lists (Fitting, Variable X, Variable Y, Coefficient).