HVAC and building services
Duct area from flow and velocity
Calculates duct cross-sectional area from volumetric flow rate and air velocity.
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Rectangular duct equivalent diameter
Calculates a helper equivalent diameter for a rectangular duct from its side lengths, without HVAC equipment selection.
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Calculates flow velocity from volumetric flow and cross-sectional area.
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Fan power from flow and pressure rise
Calculates auxiliary fan power from volumetric flow rate, pressure rise, and efficiency.