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Water-Cooled Condenser Flow Requirements Formulae and Calculator

Heat Transfer Engineering
Thermodynamics
Physics

Water-Cooled Condenser Flow Requirements Calculator

The volumetric flow rate of condensing water required can be calculated from

Pressure as a function of altitude is
Eq. 1
Q = q_o / [ ρc_p(t₂ - t₁) ]

where

Q = volumetric flow rate of water (ft³ / hr)
Multiply ft³/hr by 0.125 to obtain gpm
q_o = heat rejection rate (Btu / ft³)
ρ = density of water (lb / ft³)
c_p = specific heat of water at constant pressure (Btu / lb-°F)
t₁ = temperature of water entering condenser (°F)
t₂ = temperature of water leaving condenser (°F)

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Source

2016 ASHRAE Handbook - HVAC Systems and Equipment, ASHRAE: 2016.