Esp Calculation Hvac Excel Sheet

= (0.00011136 * (CFM^1.9)) / ( (Duct_Diameter_inches^5.02) ) Note: This is a simplified version. Use Darcy-Weisbach for highest accuracy.

ESP is the total resistance to airflow created by all components external to the HVAC equipment (air handler or furnace). It is measured in inches of water column (in. w.c. or "WC). esp calculation hvac excel sheet

ESP is the lifeblood of duct design. It represents the resistance the fan must overcome to push air through the supply and return duct systems (excluding the equipment itself). Calculate it too low, and the system suffocates (low airflow, frozen coils, short compressor life). Calculate it too high, and you oversize the fan, wasting energy and capital. and the system suffocates (low airflow

For rectangular ducts, first calculate : and you oversize the fan

In Excel: