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Main Articles Sandwich panel thickness selection for refrigerators
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Sandwich panel thickness selection for refrigerators

31.01.2021

Correct selection of energy-efficient sandwich panels is an extremely important stage in construction of refrigerators and freezers, as well as buildings with regulated gas environment, such as fruits and vegetables stores.

Sandwich panel

 

To enable maximum duration of fruits and vegetables storage, optimal temperature and humidity conditions need to be created, ensured by usage of cold stores with regulated gas environment.

 

The building envelope of refrigerators and freezers have to possess the following properties:

 

  • High air-tightness, which excludes heat losses. Air permeability from n50 ≤ 0,6 l/h.
  • Exclusion of frost penetration and cold bridging.
  • No smell absorption or emission.
  • Safe contact with stored products and stability towards influence of microorganisms.
  • Durability for impact of detergents and disinfection agents.
  • Stability (low water absorbing property of materials and corrosion resistance) in humid environment with relative humidity up to 100%.

 

 

Sandwich panel

 

In this case, it is not always necessary to purchase large thickness sandwich panels to achieve the required energy-saving characteristics.  The calculations performed by Ukrmetrteststandart, enable choosing optimal thickness of Ruukki sandwich panels for achieving the necessary heat transmission indicators of structures. If the average annal temperature of the ambient air in the district of refrigerator construction comprises 7°С or higher, then the necessary thickness of sandwich panels is chosen depending on the required temperature within the building.

 

The minimum required thickness of SP2E PIR and SP2E PIR Energy cold store sandwich panels for operation in summer

 Air temperature in refrigerated premise, °С
 -30-20-10-50512
Sandwich panel thickness, mm
Thickness of external walls of refrigerated premises, mm125120100100808060
Thickness of external walls of refrigerated premises of meat factories, mm1401251201001008060
Roofs above refrigerated premises, mm140120100100808060
Floor slabs above attics of refrigerated premises, mm125120100100808060

* calculations performed according to DBN V.2.6 31:2016 and SNiP 2.11.02-87

 

Sandwich panel

 

Minimum required thickness of SP2E PIR and SP2E PIR Energy cold store sandwich panels for internal walls, partitions, and floor slabs

Air temperature in warmer premise, °СAir temperature in refrigerated premise, °С
 -30-20-10-50512
Sandwich panel thickness for refrigerated premises, mm
-3040      
-206040     
-10806040    
-5100806040   
0100100806040  
512010080606040 
1012012010080606040
20120120100100806060
Sandwich panel thickness for refrigerated premises of meat factories, mm
-3060      
-206060     
-101008060    
-51001006060   
0120100806060  
512010080806060 
1012512010080806060
20140130120100806060
Sandwich panel thickness for partitions between refrigerated and non-refrigerated/non-heated premises, mm
 12010010080606060
Sandwich panel thickness for floor slabs above aired basements, mm
Average annual temperature of ambient air in the district of construction from 3 to 9°С12010010080606060
Average annual temperature of ambient air in the district of construction above 9°С120120100100808080

* calculations performed according to DBN V.2.6 31:2016 and SNiP 2.11.02-87

 

It is important to remember that dark sandwich panels for cold stores are heated faster than light ones. Thus, under DSTU EN 14509:2017, the external facing of very light color panels can heat up to +55°C, while those of dark colors – up to +80°C. Therefore, for refrigerated warehouses, it is recommended to use light colors (RAL 1015, RAL 7035, RAL 9002, and RAL 9010), and if dark panels are used, the recommendations on their application should be observed.

 

Sandwich panel

 

In construction of refrigerators and freezers, the material and type of coating of sandwich panel steel facing have to be selected correctly, depending on the aggressive nature of the environment. In premises with increased corrosion environment (area for separation, pickle preparation etc.), the Food Safe (PVC) coating or stainless steel are recommended. If premises are exposed to regular influence of detergents and cleaning agents, the polymer coating needs to be checked for durability prior to purchasing sandwich panels.

 

Understanding the special requirements to the building envelope of prefabricated buildings with refrigerated premises, Rauta offers special refrigeration sandwich panels – the best solution for construction of refrigerator warehouses or freezers. The energy-saving properties of such sandwich panels are determined by the selection of the PIR core with maximum thermal resistance (R0), excellent air-tightness of the lock, and availability of the prefabricated EPDM seal in it. The experience in construction of premises with regulated gas environment and usage of the latest technical solutions enable creation of the most state-of-the-art stores.

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Sandwich panel thickness selection for refrigerators
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