Esp Calculation Hvac Excel Sheet _verified_ 【2025-2026】

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.

In Excel:

Introduction: The Hidden Challenge of Air Distribution In the world of Heating, Ventilation, and Air Conditioning (HVAC), one of the most common yet frustrating problems is low airflow at the diffuser . A designer specifies a 1,500 CFM air handler, but upon startup, the technician measures only 900 CFM. The culprit? Incorrect External Static Pressure (ESP) calculation . esp calculation hvac excel sheet