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

1 Btu/h (British thermal unit/hour) = 0.2931W, 1W = 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 piece = 2.5kW (for air-cooled units), 1 piece = 3kW (for water-cooled units)

Instructions:

When the "piece" is used in power units, it is indicated by Hp(imperial piece) or Ps(metric piece), also known as "horsepower", 1 Hp(imperial piece) = 0.7457 kW, 1 Ps(metric piece) = 0.735 kW;

The refrigeration capacity of small and medium-sized air conditioning refrigeration units is commonly expressed as "peak", and the refrigeration capacity of large air conditioning refrigeration units is commonly expressed as "cold tons (cold tons in the United States)".

Cold storage matching cold air cooler:

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

If V(cold storage volume)<30m3, the cold storage with more frequent opening times, such as fresh meat storage, then the multiplier coefficient A=1.2;

If 30m3≤V<100m3, the cold storage with more frequent opening times, such as fresh meat storage, the multiplier coefficient A=1.1;

If V≥100m3, the cold storage with more frequent opening times, such as fresh meat storage, the multiplier coefficient A=1.0;

If it is A single cold storage, the multiplication factor B=1.1 The final cold storage cold air selection is W=A*B*W0(W is the load of the chiller);

The matching of cold storage refrigeration unit and chiller is calculated according to the evaporation temperature of -10oC.

Refrigerated cold storage matching chiller:

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

If V(cold storage volume)<30m3, the cold storage with more frequent opening times, such as fresh meat storage, then the multiplier coefficient A=1.2;

If 30m3≤V<100m3, the cold storage with more frequent opening times, such as fresh meat storage, the multiplier coefficient A=1.1;

If V≥100m3, the cold storage with more frequent opening times, such as fresh meat storage, the multiplier coefficient A=1.0;

If it is A single freezer, the multiplication factor B=1.1 The final freezer cooler selection is W=A*B*W0(W is the load of the chiller)

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

When the cold storage and the low temperature cabinet are separated, the cold storage refrigeration unit and the chiller are calculated according to the evaporation temperature of -30oC.

Cold storage processing room matching chiller:

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

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

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

When the processing room and the medium temperature cabinet share the refrigeration unit, the unit and the chiller match according to the evaporation temperature of -10oC.

When the processing room is separated from the medium temperature cabinet, the cold storage unit and the chiller are calculated according to the evaporation temperature of 0oC.

The above calculation is a reference value, accurate calculation according to the cold storage load calculation table.

Cold storage tonnage calculation:

Active cold storage tonnage = content volume of cold storage room × capacity utilization factor × unit weight of food.

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

Cold storage volume utilization factor:

500 ~ 1000 cubic =0.40

1001 ~ 2000 cubic =0.50

2001 ~ 10000 cubic =0.55

10001 ~ 15000 cubic =0.60

Unit weight of food in active cold storage:

Frozen meat =0.40 tons/m3

Frozen fish =0.47 tons/m3

Fresh fruits and vegetables =0.23 tons/m3

Mechanized ice =0.75 tons/m3

Frozen lamb cavity =0.25 tons/m3

Cut meat or by-products =0.60 tons/m3

Frozen poultry in boxes =0.55 tons/cubic meter

Calculation method of storage volume of active cold storage:

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

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

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

The actual maximum amount of active cold storage

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

Maximum storage volume (tons)= total content 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 fruit Ice machine Ice

Weight kg/m3 400 470 260 230 230 600 750

Daily inventory volume actually used

In the absence of special specified occasions, the actual use of the daily storage volume according to the maximum storage volume (tons) of 15% or 30%

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