1 kcal/h (kcal/hour) = 1.163W, 1 W = 0.8598 kcal/h;

　　1 Btu/h (British thermal unit/hour) = 0.2931W, 1 W = 3.412 Btu/h;

　　1 USRT (United States cold tons) = 3.517 kW, 1 kW = 0.28434 USRT;

　　1 kcal/h = 3.968 Btu/h, 1 Btu/h = 0.252 kcal/h;

　　1 USRT ＝ 3024 kcal／h，10000 kcal／h ＝ 3.3069 USRT；

　　1 horse = 2.5 kW (for air-cooled units), 1 horse = 3 kW (for water-cooled units)

　　Description:

　　When "hp" is used as a power unit, it is represented by Hp (imperial horses) or Ps (metric horses), also known as "horsepower", 1 Hp (imperial horses) = 0.7457 kW, 1 Ps (metric horses) = 0.735 kW;

　　The cooling capacity of small and medium-sized air-conditioning refrigeration units is usually expressed as "hp", and the cooling capacity of large air-conditioning refrigeration units is usually expressed as "cold ton (US refrigeration ton)".

　　Air cooler matching for cold storage:

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

　　If V (cold storage volume) <30m3, cold storage with frequent door openings, such as fresh meat storage, multiplying coefficient A=1.2;

　　If 30m3≤V＜100m3, cold storage with frequent door openings, such as fresh meat storage, multiplying coefficient A=1.1;

　　If V≥100m3, cold storage with frequent door openings, such as fresh meat storage, multiplying coefficient A=1.0;

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

　　The matching of cold storage refrigeration unit and air cooler is calculated at -10oC evaporation temperature.

　　Air cooler matching for refrigeration cold storage:

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

　　If V (cold storage volume) <30m3, cold storage with frequent door openings, such as fresh meat storage, multiplying coefficient A=1.2;

　　If 30m3≤V＜100m3, cold storage with frequent door openings, such as fresh meat storage, multiplying coefficient A=1.1;

　　If V≥100m3, cold storage with frequent door openings, such as fresh meat storage, multiplying coefficient A=1.0;

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

　　When the cold storage and the low-temperature cabinet share the refrigeration unit, the matching of the unit and the air cooler is calculated according to the -35oC evaporation temperature.

　　When the cold storage is separated from the low-temperature cabinet, the matching of the cold storage refrigeration unit and the air cooler is calculated according to the -30oC evaporation temperature.

　　Air cooler matched in cold storage processing room:

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

　　If V (volume of processing room) <50m3, multiplying factor A=1.1;

　　If V≥50m3, the multiplying factor A=1.0. The final cold storage air cooler is selected according to W=A*W0 (W is the load of the air cooler);

　　When the processing room and the medium temperature cabinet share the refrigeration unit, the matching of the unit and the air cooler is calculated based on the -10oC evaporation temperature.

　　When the processing room is separated from the medium temperature cabinet, the cold storage unit and the air cooler are matched according to the 0oC evaporation temperature.

　　The above calculation is a reference value, and the accurate calculation is based on the cold storage load calculation table.

　　Cold storage tonnage calculation:

　　Active cold storage tonnage = internal volume of cold storage room × volume utilization coefficient × unit weight of food.

　　The internal volume of the cold storage room of the mobile cold storage = inside the storage, length × width × height (cubic)

　　Volume utilization factor of cold storage:

　　500～1000 cubic meters = 0.40

　　1001～2000 cubic =0.50

　　2001～10000 cubic meters =0.55

　　10001～15000 cubic meters = 0.60

　　Unit weight of food in mobile cold storage:

　　Frozen meat = 0.40 tons/cubic

　　Frozen fish = 0.47 tons/cubic

　　Fresh fruits and vegetables = 0.23 tons/cubic

　　Machine-made ice = 0.75 tons/cubic

　　Frozen sheep cavity = 0.25 tons/cubic

　　Boneless meat or by-products = 0.60 tons/cubic

　　Frozen poultry in boxes = 0.55 tons/m3

　　Calculation method of storage volume of mobile cold storage:

　　In the warehousing industry, the formula for calculating the maximum storage volume is:

　　Effective content volume (m3) = total content volume (m3) X0.9

　　Maximum storage volume (tons) = total internal volume (m3)/2.5m3

　　Actual maximum storage volume of active cold storage

　　Effective content volume (m3) = total content volume (m3) X0.9

　　Maximum storage volume (tons) = total internal volume (m3) X (0.4-0.6)/2.5m3

　　0.4-0.6 is determined by the size and storage of the cold storage. (The following table is for reference only)

　　Food category Frozen meat Frozen fish Fresh eggs Fresh vegetables Fresh fruits Ice egg machine Ice making

　　Heavy kg/m3 400 470 260 230 230 230 600 750

　　Actual daily storage volume

　　If there is no special designation, the actual daily storage volume is 15% or 30% of the maximum storage volume (tons)

Calculation (generally less than 100m3 is calculated at 30%).