Cold Storage Warehouse Types Based on Refrigerating Temperature Range
High temperature walk-in cooler cold storage warehouse - Class L, Temperature Range: +5℃~ -5℃. The storage purpose of this refrigerator cold room is for refrigerated storage of food like vegetable, fruit, egg, pharmaceutical material, floral, wood and other things suitable for this temperature range.
Medium temperature walk-in freezer cold storage warehouse - Class D, Temperature Range: -10℃~ -18℃. The storage purpose of this freezer cold room is for frozen storage of food like meat, seafood and other things suitable for this temperature range.
Low temperature walk-in freezer cold storage warehouse - Class J, Temperature Range: -23℃~ -28℃. The storage purpose of this deep freezer cold room is for the frozen storage of ice cream and other deep frozen food etc.
Ultra low temperature walk-in freezer cold storage warehouse - Temperature Range: ≤-30℃. The storage purpose of this ultra low temperature cold room is mainly for fast frozen food, industrial laboratory test room, medical treatment, blood bank, etc.
To design a cold storage plant, besides considering the size of the cold storage warehouse, the important thing you need to consider for a refrigerated warehousing project is to select the suitable refrigeration temperature of the refrigerated warehouse. The temperature of the cold room plant shall not be too high or too low.
Cold Storage Warehouse Types Based on Installation Structure:
Civil construction refrigerated warehouse - The space enclosing structure wall material of the cold store room is made of brick and the heat insulation material is made of sprayed polyurethane (PU foam).
Assembling refrigerated warehouse - The space enclosing structure wall material of the cold store room is made of prefabrication modular cold room insulated panel (insulated foam panel). The foamed insulation material of the cold room panel is polyurethane (PU panel).
To build a civil construction refrigerated warehouse or assembling refrigerated warehouse, you need to consider your local building construction and local building cost on the refrigerated warehousing storage project. We prefer to build a assembling refrigerated warehouse because the prefabricated modular cold room panel (insulated sandwich PU foam panel) can be installed and disassembled at any time and it is very convenient to move the cold storage warehouse to another installation place.
Refrigerated Storage Requirements of Food and Physical Nature
Before you decide to design and build a walk-in cooler or walk-in freezer cold storage warehouse, you need to first know what is the best storage temperature of the cold room plant to store your food material or other materials. In this way, you can avoid to build a refrigerated warehouse which is not cool enough to store goods or is too freezing and to freeze & destroy the food and waste investment money on cold storage plant project cost because the colder temperature requires bigger powerful compressor and refrigeration system.
Food Name |
Refrigerating Temperature （℃） |
Relative Humidity （%） |
Storage Period （Month） |
Freezing Point （℃） |
Specific Heat （KJ/Kg.℃) |
Latent Heat （KJ/Kg） |
Storage Capacity （m3/t） |
|
Above Frozen Point |
Below Frozen Point |
|||||||
Apple |
-1~1+1 |
85~95 |
（2~7） |
-2 |
3.85 |
2.09 |
218 |
7.5 |
Banana |
+11.7 |
85 |
14 |
-1.7 |
3.35 |
1.76 |
251 |
15.6 |
Pear |
-0.5~+1.5 |
85~95 |
1-6 |
-2 |
3.77 |
2.00 |
281 |
7.5 |
Grapes |
1~-+3 |
85~90 |
(1~4) |
-4 |
3.6 |
1.84 |
272 |
9.4 |
Onion |
-1.5 |
80 |
(3) |
-1 |
3.77 |
1.93 |
289 |
9.4 |
Cabbage |
0~+1 |
85~90 |
(1~3) |
-0.5 |
3.89 |
1.97 |
306 |
15.6 |
| Potato | +3~+5 | 85~90 | (6) | -1.2 | ||||
Egg |
-1~-0.5 |
85~85 |
(8) |
-2.2 |
3.18 |
1.67 |
226 |
|
Fresh Pork |
0~+1.2 |
85~90 |
3-10 |
-2.2 |
2.26 |
1.34 |
126 |
|
Frozen Pork |
-24~-15 |
85~90 |
(2~8) |
8.2 |
||||
Frozen Poultry |
-30~-10 |
80 |
(3~8) |
6.2 |
||||
Frozen Mutton |
-12~-18 |
80~85 |
(3~8) |
6.2 |
||||
Frozen Egg |
-18 |
(12) |
||||||
Sausage |
-4~+5 |
85~90 |
7~21 |
|||||
Milk Oil |
0~+2 |
80 |
7 |
7.5 |
||||
Sugar |
+7~+10 |
<60 |
(12~36) |
0.2 |
0.84 |
1.67 |
||
Rice |
+1.5 |
65 |
(6) |
-1.7 |
1.09 |
|||
Beer |
0~+5 |
(6) |
-2 |
3.77 |
1.88 |
301 |
10.6 |
|
The above form shows the best suitable temperature for the refrigerating storage of different food materials of fruit, vegetable, meat, drink beverage etc.. So you can take the listed temperature range as reference to design and build your walk-in cold storage warehouse and refrigerated warehouse for your restaurant, hotel kitchen, supermarket, chain store, vegetable & fruit market and other cold storage logistics plant.
POLYURETHANE vs POLYSTYRENE
The question often arises "what is the difference between Polyurethane and Polystyrene". The review below is a general comparison and does not necessarily represent a particular manufactures product.
There are five main differences that need to be evaluated:
R-value. Urethane has an R-value of 7.0 to 7.5 per inch whereas styrene has an R-value of 3.5 to 4.0 per inch. The R-value for both materials may vary by the manufacture and density of the material.
Chemical resistance. Urethane is resistant to damage caused by other chemicals. Styrene is subject to attack by petroleum-based solvents such as gasoline, many types of insect sprays and common glues such as "Liquid Nails". These problems normally will not effect a building unless there is an insect infestation that must be treated.
Fire damage. Urethane is a thermal-set plastic and does not melt. It is not damaged until the temperature reaches 700 to 800 deg. and then it uses urethane that has been treated with flame retardant and has been tested as a Class 1 foam. A Class 1 foam means that when burned, an external heat source is required to sustain combustion. If left on it’s own, the foam will self extinguish. Styrene on the other hand will soften and 190 to 220 deg and melt at temperatures of 240 to 300 deg. Many styrene products are also classified as Class 1 foam and will not sustain combustion, but melt at a very low temperature. There is a lot of debate as whether the Class 1 fires test should apply to Styrene.
Dimensional Tolerance. Due to the manufacturing process, styrene panels have the opportunity to have tighter tolerances for thickness than urethane panels. Styrene cores are cut with a hot wire and then laminated to the skins. This cutting process should be very controlled. Urethane cores are injected molded into the skins. The expansion of urethane is very dependent upon temperature, humidity and other factors. This expansion process is more difficult to control resulting in some thickness variations.
Foam cutting tools. When routing out the foam for modifications there is a difference in the two materials. Styrene can be cut out using a hot wire, because of the low melting point. Urethane can not be melted so must be mechanically removed. A special router is used for this purpose.