Esp Calculation Hvac Excel Sheet !link! -

Short paper: ESP Calculation for HVAC — Excel Sheet Implementation

Step 1: Set Up Input Columns

Create columns for:

  • Item Name (e.g., "Supply Main Duct")
  • Quantity
  • Pressure Drop per Unit (in. w.g.)
  • Total PD (Quantity × PD per Unit)

Problem

A hospital RTU delivers 8,000 CFM instead of 10,000 CFM. The maintenance team replaced filters but no improvement. esp calculation hvac excel sheet

Part 8: Real-World Case Study – Fixing Static Pressure with Excel

Tab 2: The Ductulator (Friction Loss)

While fittings use the $C \times P_v$ method, straight duct runs use the Darcy-Weisbach or Ashrae Friction Chart method. Short paper: ESP Calculation for HVAC — Excel

  • Input: Diameter (Round) or Width/Height (Rectangular).
  • Calculation: Equivalent Diameter, Velocity, Friction Rate ($in.wg$ per 100 ft).
  • Excel Formula Logic: You can approximate friction loss using the Swamee-Jain equation (explicit approximation of Darcy-Weisbach) or use a lookup table. For straight duct: $$\Delta P_duct = \textFriction Rate \times \frac\textLength100$$

Step 2 – Add Fittings

From dropdown menus, select:

  • Supply elbows: qty 2
  • Return elbows: qty 1 The sheet looks up equivalent length from a hidden table (e.g., a 16" round elbow = 12 ft EL). It calculates:
  • Total EL supply = 50 + (2×12) = 74 ft
  • Total EL return = 30 + (1×10) = 40 ft

Section A: Input Parameters (Constants)

  • System Type: Supply only, return only, or both.
  • Design Airflow (CFM): Total and per branch.
  • Duct Material: Galvanized steel (roughness=0.0003 ft), flex duct (roughness=0.003 ft), or fiberglass.
  • Air Density Correction: Elevation (sea level vs. Denver).
  • Temperature: Standard 70°F or hot/cold adjust.