Calculating chiller and cooling tower refrigeration - in tons Cooling towers tons pairs the water-cooled chiller tons and the water-cooled condenser tons.  Chiller Refrigeration Tons The process of cooling is called refrigeration. Refrigeration or cooling capacity can be measured in tons. A water-chiller refrigeration ton is defined as: 1 Refrigeration Ton (RT) = 1 TONScond = 12000 Btu/h = 200 Btu/min = 3025.9 k Calories/h = 12661 kJ/h = 3.517 kW 1 kW = 0.2843 Refrigeration Ton (RT) A ton is the amount of heat removed by an air conditioning system that would melt 1 ton (2000 lbs.) of ice in 24 hours. The heat required to melt 1 lb of ice at 32 oF to water is 144 Btu. 1 Ton Refrigeration = (2000 lb) (144 Btu/lb) / (24 hr)     = 12000 Btu/hr Converting between Btu/h and Tons of Refrigeration Btu/h Refrigeration Ton 6000 1/2 12000 1 18000 1 1/2 24000 2 30000 2 1/2 36000 3 42000 3 1/2 48000 4 54000 4 1/2 60000 5 Cooling Tower Tons A cooling tower ton is defined as: 1 cooling tower ton = 1 TONSevap = 1 TONScond x 1.25 = 15000 Btu/h = 3782 k Calories/h = 15826 kJ/h The equivalent ton on the cooling tower side actually rejects about 15000 Btu/h due to the heat-equivalent of the energy needed to drive the chiller's compressor.

This equivalent ton is defined as the heat rejection in cooling 3 U.S. gallons/minute (1500 pound/hour) of water 10°F, which amounts to 15000 Btu/hour, or a chiller coefficient-of-performance (COP) of 4.0 - a COP equivalent to an energy efficiency ratio (EER) of 13.65. Heat Load and Water Flow A water systems heat load in Btu/h can be simplified to: h = cp ρ q dt     = (1 Btu/lbm oF) (8.33 lbm/US gal) q (60 min/h) dt     = 500 q dt         (1) where h = heat load (Btu/h) cp = specific heat, 1 (Btu/lbm oF) for water ρ = 8.33 (lbm/US gal) for water q = water volume flow rate (US gal/min) dt = temperature difference (oF) Example - Water Chiller Cooling Water flows with 1 gal/min and 10oF temperature difference. The ton of cooling load can be calculated as: Cooling load = 500 (1 US gal/min) (10 oF) / 12000     = ton Converting between heat and energy units Converting kW/tonn to COP or EER en: cooling load tonses: enfriamiento de toneladas de cargade: Kühllast Tonnen

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