Hvac Design Calculations Excel ((new)) <BEST — 2026>

=B2/(1.08*20) – assuming B2 holds the sensible heat load. 3. Duct Sizing (Equal Friction Method) Using the equal friction method (e.g., 0.08 to 0.12 in. w.g./100 ft), you can size ducts using a friction chart approximation.

Below is a breakdown of the core HVAC calculations you can perform effectively in Excel, along with the logic to build them. Excel excels at handling the repetitive yet formulaic nature of heat gain calculations. The most common manual method is the CLTD/CLF/SCL (Cooling Load Temperature Difference / Cooling Load Factor / Solar Cooling Load) method. hvac design calculations excel

Velocity (FPM) = CFM / Area (ft²) . Add conditional formatting to highlight if velocity exceeds 1,500 FPM (noise risk) or 2,500 FPM (erosion risk). 4. Water Pipe Sizing (Hydronic Systems) For chilled or hot water systems, use: =B2/(1

CFM = Sensible Heat Load (Btu/hr) / (1.08 * ΔT) The most common manual method is the CLTD/CLF/SCL

Or for heating: GPM = Btu/hr / (500 * ΔT)

Store a friction loss vs. CFM vs. diameter table. Use INDEX/MATCH or linear interpolation to find the nearest duct diameter for a given CFM at your target friction rate.