Esp Calculation For Duct !link! -

Trace the airflow from the fan discharge to the absolute furthest terminal outlet. The index circuit is not always the longest physical run; it is the path containing the highest cumulative concentration of fittings, dampers, and terminal restrictions. Step 2: Determine Linear Friction Losses ( ΔPstraightcap delta cap P sub straight end-sub

Dynamic loss coefficient method: $$\Delta P_d = C \cdot \frac\rho v^22$$ Where:

Use the formula: $$ \Delta P = C \times P_v $$ esp calculation for duct

Small office AHU serving 2000 CFM. Supply duct: 100 ft straight, 4 elbows, 1 diffuser. Return duct: 60 ft straight, 2 elbows, 1 grille, 1 filter (MERV 8). Accessory: Chilled water coil (ΔP = 0.4 in. w.g.).

Complete Guide to External Static Pressure (ESP) Calculation for Ducts Trace the airflow from the fan discharge to

Typically 10% to 15% of the calculated total.

ΔPstraight=R×Lactualcap delta cap P sub straight end-sub equals cap R cross cap L sub actual end-sub Supply duct: 100 ft straight, 4 elbows, 1 diffuser

Appendix: ASHRAE Fundamentals Handbook, Chapter 21 (Duct Design) provides full loss coefficient tables and friction charts for all standard fittings.

Where:

Let's calculate the ESP for a simple Supply Air system.