Water Evaporator and Condenser Equations
Air conditioner heat loads and evaporator and condenser water flow rates.
Total heat load:
h = cp ρ q dt
= 500 q dt (1)
where
h = heat load (Btu/h)
cp = 1 (Btu/lbm oF) for water
ρ = 8.33 (lbm /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 ( 1 refrigeration ton = 1 TONS cond = 12,000 Btu /h = 200 Btu/min = 3,025.9 k Calories /h = 12,661 kJ/h = 3517 kJ/s = 3517 kW = 4713 HP )
Condenser water flow rate can be expressed as
q cond = 30 h cond / dt (3)
where
q cond = condenser water flow rate (gallons per minute - gpm)
h cond = air condition load, chiller tonnage ( 1 cooling tower ton = 1 TONS evap = 1 TONS cond x 1.25 = 15,000 Btu/h = 3,782 k Calories/h = 15,826 kJ/h )
Related Topics
-
Air Conditioning Systems
Design of Air Conditioning systems - heating, cooling and dehumidification of indoor air for thermal comfort.
Related Documents
-
Calculating Cooling Loads
Calculating chiller and cooling tower refrigeration loads - in tons. -
Chilled Water Systems
Chilled water system equations - evaporator and condenser flow rates. -
Cooling Power vs. Airflow and Duct Sizes
Typical relations between cooling power (tons cooling), air flow and duct size -
Refrigeration Machinery - Required Ventilation
Ventilation required for refrigeration machinery and compressors in hot areas.
