Cold ton-horse-power-unit conversion-cooler matching knowledge

Cold ton-horse-power-unit conversion-cooler matching knowledge

Cold Ton (RT):Air-conditioning refrigeration unit, also known as cold ton, frozen ton, refers to the energy required to freeze a ton of water into ice.(Note:One cold ton is the amount of refrigeration required to make 1 ton of 0 ° C water into 0 ° C ice in 24 hours.) The capacity of 1 ton of 0 degrees Celsius water to be converted to 0 degrees Celsius ice in 24 hours. The refrigerated ton indicates the refrigerating capacity of the refrigerator.

Horse (HP):The air-conditioning cooling capacity (PH) is calculated in kcal or watts (W). Generally speaking, 1PH = 2000 kcal, multiplied by 1.16 in international units.

Calculate 2500W as the standard 1PH in daily life.

23 represents a small horse;The cooling area is 10-14 square meters.

26 represents positive 1 horse;The cooling area is 14-18 square meters.

32 represents 1.5 horses;The cooling area is 18-22 square meters.

35 represents positive 1.5 horses;Refrigeration area is 22-25 square meters.

Power (W):Power refers to the work that an object does in a unit of time, that is, power is a physical quantity that describes the speed at which work is performed.The amount of work is constant, the shorter the time, the greater the power value.The formula for finding power is power = work / time.Power is used to describe the speed at which work is performed. The amount of work completed in a unit of time is called power.

Unit conversion:

1 US cold ton = 3024 kilocalories / hour (kcal / h) = 3.517 kilowatts (kW)

1 Japan cold ton = 3320 kcal / h (kcal / h) = 3.861 kilowatts (kW)

1 horsepower (or horsepower) = 735.5 watts (W) = 0.7355 kilowatts (kW)

1 kilocalorie / hour (kcal / h) = 1.163 watts (W)

Celsius ℃ = (Fahrenheit ° F-32) 5/9

1HP = 2.5kW = 735.5W:Note:2.5kW corresponds to the cooling capacity, while 735.5w corresponds to the electric power.

First of all, we must find out the unit of heat. Thermal energy is also a kind of energy. The unit of work and energy is Joule in the world. The work done is J.China's legal thermal unit is J.

Under standard atmospheric pressure, when 1g of water is heated or cooled, when the temperature is increased or decreased by 1 degree, the added or released heat is called 1 card, which is expressed in cal. In engineering, it is often expressed as 1000 times the heat of the card. Called kcal or kcal, expressed in kcal.Source of this article:Refrigeration Encyclopedia.

Under standard atmospheric pressure, when 11b (pounds) (11b = 0.454kg) of water is heated or cooled, and the temperature is increased or decreased by 1 degree Fahrenheit, the added or removed heat is called a British thermal unit, and the symbol is Btu .

Common conversion formula:

1kJ (kilojoules) = 0.239kcal (kcal)

1kcal (kcal) = 4.19kJ (kJ)

1kcal = 3.969Btu

1Btu = 0.252kcal

1kcal = 427kg.m

1kW = 860kcal / h

1 US cold ton = 3024kcal / h = 3.51kW

1 Japan cold ton = 3320kcal / h = 3.86kW

For example, a 40kW air conditioner has a cooling capacity of 40 * 860 = 34,400 kcal.

Civil air conditioners like to use (H) P as the unit, 1 (H) P = 0.735kW, the general energy efficiency ratio is 3.2, and the cooling capacity is 2352W, which is converted into about 2022 kcal.Source of this article:Refrigeration Encyclopedia.It can be said that the cooling capacity of 1 (H) P air conditioner is 2000 kcal.

Refrigerators and coolers:

The load per cubic meter is calculated as W0 = 75W / m3.

1. If V (cold storage volume)<30m3, cold storage with more frequent door openings, such as fresh meat storage, the multiplication factor A = 1.2;

2. If 30m3≤V<100m3, the cold storage with more frequent door openings, such as fresh meat storage, the multiplication factor A = 1.1;

3. If V≥100m3, cold storage with more frequent door openings, such as fresh meat storage, the multiplication factor A = 1.0;

4. If it is a single refrigerator, the multiplication factor B = 1.1 The final cold storage air conditioner is selected according to W = A * B * W0 (W is the load of the cold air generator);Source of this article:Refrigeration Encyclopedia.

5. The matching of refrigerating units and coolers in cold storage is calculated according to the evaporation temperature of -10 degrees. (This calculation is a reference value, and the exact calculation is based on the cold storage load calculation table.）

Refrigerators with matching coolers:

The load per cubic meter is calculated as W0 = 70W / m3.

1. If V (cold storage volume)<30m3, cold storage with more frequent door openings, such as fresh meat storage, the multiplication factor A = 1.2;

2. If 30m3≤V<100m3, the cold storage with more frequent door openings, such as fresh meat storage, the multiplication factor A = 1.1;

3. If V≥100m3, cold storage with more frequent door openings, such as fresh meat storage, the multiplication factor A = 1.0;

4. If it is a single freezer, the multiplication factor B = 1.1. The final cold storage air conditioner is selected according to W = A * B * W0 (W is the load of the cold air generator)

5. When the cold storage unit and the low temperature cabinet share the refrigeration unit, the unit and the cooler match are calculated according to the -35 degree evaporation temperature. (此The calculation is a reference value, and the exact calculation is based on the cold storage load calculation table.）

Cooler matching in cold room processing room:

The load per cubic meter is calculated as W0 = 110W / m³.

1. If V (volume of processing room) is less than 50m³, the multiplication factor is A = 1.1;

2. If V≥50m³, the multiplication factor A = 1.0. The final cold storage air conditioner selection is W = A * W0 (W is the air conditioner load)

3. When the processing unit and the medium temperature cabinet share the refrigeration unit, the matching of the unit and the cooler is calculated according to the -10ºC evaporation temperature.When the processing room is separated from the medium temperature cabinet, the matching of the cold storage unit and the air cooler is calculated at 0ºC evaporation temperature.（此Calculated as reference value, accurate calculation according to cold storage load calculation table）。