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Engineering ToolBox > Water Evaporator and Condenser Equations

Air condition load, evaporator and condenser water flow rate

The total heat can be expressed as:

h = c_p ρ q dt

    = 1 (Btu/lb_m ^oF) 8.33 (lb_m/gal) q (gal/min) 60 (min/h) dt (^oF)

    = 500 q dt (1)

where

h = heat load (Btu/h)

c_p = 1 (Btu/lb_m ^oF) for water

ρ = 8.33 (lb_m/gal) for water

q = water volume flow rate (gal/min)

dt = temperature difference (^oF)

Evaporator water flow rate can be expressed as

q_evap = 24 h_evap / dt (2)

where

q_evap = evaporator water flow rate (gallons per minute - gpm)

h_evap = air condition load (tons = 15,000 Btu/h = 3,782 k Calories/h)

Condenser water flow rate can be expressed as

q_cond = 30 h_cond / dt (2)

where

q_cond = condenser water flow rate (gallons per minute - gpm)

h_cond = air condition load (tons = 15,000 Btu/h = 3,782 k Calories/h)