FAQ

The difference between cold ton and water ton of closed cooling tower

Author：Trlon Views: Time:2022-01-11

　　What is the difference between the cooling ton and the water ton of the closed cooling tower? What does the cooling ton and the water ton of the closed cooling tower mean?

　　Closed cooling towers use "cold ton" to identify the type of tower more than open cooling towers. It is particularly important to note that in the refrigeration system, the cooling ton defined for the refrigerator and the cooling tower are related, but they are not the same. The former is the cooling ton of cooling capacity, and the latter is the cooling ton of heat dissipation. Under the premise, they are called "cold tons".

　　1. Refrigerator cooling capacity cooling tons

　　The refrigerating capacity of the refrigerator, also known as the freezing ton, has a metric definition and an imperial definition. The industry also usually calls it Japanese ton, American ton or British ton:

　　The metric system is defined as:

　　1 cold ton defined by the metric system is the cooling capacity necessary for 1 ton of plump water at 0°C to freeze to 0°C ice in 24 hours. According to the melting heat of ice being 333.59KJ/Kg, metric 1RT (cold ton) = 3320 kcal/h=3.861kw, also known as Japanese cold ton in the industry;

　　Imperial is defined as:

　　imperial definition

　　1 cold ton is 2000 Lb (lbs)32. Frozen plump water to 32 in 24 hours. The necessary cooling capacity of F ice, according to the melting heat of ice 144Btu/Lb

　　Gauge (Btu is British thermal unit, defined as the heat required for 1Lb of water temperature to drop 1.F, then 1Btu=252cal=1055.06J, and

　　1Lb=0.453592Kg, so 144Btu/Lb=334.95 KJ/Kg), so the imperial 1RT=3024 kcal/h=3.517kw,

　　Also called American cold ton; perhaps according to British cold ton: 1 British cold ton = 3373 kcal/h = 3.923 kw, 1 new British cold ton = 3590 kcal/h = 4.175 kw.

　　2. Cooling tower cooling ton

　　Regarding the cooling capacity of the closed cooling tower, we have to consider the heat released by the cooling tower in the cooling cycle, in addition to the cooling capacity, there is also the power consumption of the compressor, and there are also differences between the metric and imperial definitions.

　　The metric system is defined as:

　　1CRT——When the wet bulb temperature of the atmosphere is 27℃, 13LPM (liter/min, or 0.78m3/h) of pure

　　The cooling of water from 37°C to 32°C is 1 ton, and its heat dissipation is 4.515Kw.

　　Imperial is defined as:

　　1usTon - the wet bulb temperature in the atmosphere is

　　78. F (25.5°C), 3 gpm (US gallons/min, or 0.68137m3/h) of pure water from 95. F (35 °C) cooled to 85. F

　　(29.4°C), which is 1 British ton of refrigeration, and its heat dissipation is 4.392 Kw; it can also be understood that when the wet bulb temperature of the atmosphere is 28°C, 13LPM (liter/min, that is,

　　0.68m3/h) of pure water is cooled from 37℃ to 32℃, which is 1 cold ton, and its heat dissipation is 4.392Kw.

　　3. my country's current cooling tower cooling ton indicator

　　In my country, there is currently no national standard for closed towers. For closed cold water towers, when the cold ton mark is used,

　　The normative planning conditions are usually

　　37°C/32°C/27°C; when it is marked with water tons (that is, flow rate), the standard planned working conditions are usually 37°C/32°C/28°C or 43°C/33°C/28°C. Above atmospheric dry bulb temperature is 31.5℃, atmospheric pressure

　　9.94×104Pa. Using the cold ton mark and the water ton mark, the heat removal coefficients of the two are inconsistent when the working conditions are changed. For products with other design conditions, it must be converted to the standard design conditions, and in the sample or product specification, the cooling tons or the flow rate of the cooled water should be marked according to the standard design conditions.

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