In case of heating or air conditioning equipment, the design air flow rate is what you get from the cooling load program.Ģ. Write down the "DESIGN AIR FLOW RATE" required for the fan. The index run is the duct run with the maximum external static pressure drop.ġ. It is worth mentioning here also that ESP has to be calculated for different scenarios to ensure that the calculated ESP is indicating the maximum ESP drop in the system which will be for the Index run noting that the index run is not mandatory to be the furthest duct run. The below calculation sheet is very simple and all engineers can make use of it in order to estimate / calculate the External static pressure (ESP) of any fan in any HVAC equipment.
#BUILDING AIRFLOW STANDARD CALCULATOR SPREADSHEET HOW TO#
What are the steps and how to estimate / calculate the External Static Pressure of a fan?
To do that, the fan pressure has to overcome all loses in the direction of air flow (on the Suction and Discharge side of the equipment) including, but not limited to, Volume control dampers, Fire Dampers, pressure drop in air outlets, duct pressure drop, duct fittings losses, External air louvers (in case if the Outside Air Intake duct has the index run compared to the return air duct). What is External Static Pressure in HVAC Ducts?Įxternal Static Pressure is basically and simply the pressure required by a fan (which is located inside any HVAC equipment) to deliver the required / design airflow rate and to allow air to reach from the HVAC equipment to the Index point so air can be discharged with the required airflow rate even from the furthest air outlet (Diffuser or air grille.etc).
and accordingly, we can estimate as well the power consumption of such units. Estimating External Pressure drop in ducts is not a rocket science and it can be done easily in order to select the HVAC equipment's fan (Air Handling Unit, Fan, Heat Recovery Unit, Fan Coil Unit.etc).
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