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HVAC Master

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- calculating water pressure drop in cooling tower piping system

When calculating water pressure drop in chilled water pipisystem (closed circuit) we always use Hazen Williams equation as follow:-

but in case of calculating water pressure drop in cooling tower piping system (open circuit), shall we modify something in Hazen Williams equation or shall we use another equation?h100ft = 0.2083 x (100 / c)^1.852 x q^1.852 / dh^4.8655

where

h100ft= friction head loss in feet of water per 100 feet of pipe (ft.w/100 ft pipe)

c = Hazen-Williams roughness constant

q = volume flow (gal/min)

dh = inside hydraulic diameter (inches)