Cold Room Designing and Installation

  1. Introduction

PUF Panel are made of Polyurethane which is usually between two metal sheets. PUF panels are widely used in steel structures in the present day due to their various advantages.

Made as per required (thick in mm) and composite PUF sand the wall panels between Pre-Painted Galvanized Iron Sheet. PU foam of density as per your required of (40±2 kg/m3) as insulation. Pre-Painted Galvanized Iron Sheet shall have minimum coating of 4–5-micron epoxy primer and 25-micron polyester topcoat on the finish surface & 7–8-micron primer alkyl base on reverse.

History of PUF Panel – Polyurethane chemistry was first studied byte German chemist, Friedrich Bayer in 1937. From In 1940, the first polyurethane produced. These compounds gave millefleurs that could be used as an adequate alternative to rubber. When stretchable garments. Polyisocyanates became commercially available in 1952.

Chemistry Of PUF Panel – Polyurethanes, also known polycarbamate’s, belong to a larger class of compounds called polymers. Polyurethanes are characterized by carbamate groups (-NHCO2). A variety of raw materials are used to produce polyurethanes. These include monomers prepolymers

  1. Types of PUF Panel 
  • Single Groove: These are suitable for general purpose and application in buildings and shelters.
  • Double Groove: These are suitable for cold room and cold chamber applications, as groves helps in retaining the inside temperature via less heat transfer.




Single Groove                                                                                                                     Double Groove


  1. Production step for PUF Panel

3.1. De – Coiling System

Decoiling System is to feed the colour steel sheet (PPGI: Pre-Painted Galvanized Iron) to the sandwich panel production line continuously.

3.2. Roll Forming System

Rolling Forming System also spelled roll-forming is a type of rolling involving the continuous bending of a long strip of sheet metal.

3.3. Polyurethane Foaming System

Polyurethane Foaming System Polyurethane foams (often referred to as urethane foams) are prepared by the reaction of a Polyisocyanates with a polyol.

3.4. Double Belt Conveyor System

Double Belt Conveyor System transport system for the highly flexible inter linking of different production areas.

3.5. Cutting System

The cutting system is a machine that is used for separating materials. There by a variety of materials, such as aluminium, tin, wood, ceramics or plastics etc.

3.6. Cooling System

The cooling system is designed to load the panels in vertical position inside a conveyor system that allow an efficient heat dispersion.

3.7. Stacking System

Stacking system is to stack the cooled sandwich panels automatically with input quantity by operator. It can be manufactured as a vacuum pad type or a mechanical lifter type.

3.8. Wrapping System

The wrapping system as a last process in sandwich panel production line, it is necessary to prevent pollution on panel surface, rust at cut surface.

  1. Design Data of Cold Storage Room

4.1. Major component in cold storage room.

    1. Puf Panel – Polyutherane Foam Puf Panel
    2. Insulation Door: Can be sliding, swing or any type
    3. Refrigeration System – Indoor + Outdoor Unit.
    4. Electrical Panel to Control Refrigeration System
      • 7℃ to 25℃ (60 mm)
      • 0℃ to 7℃ (80 mm)
      • -15℃ to 0℃ (100 mm)
      • -30℃ to -15℃ (120 mm)
      • -40℃ to -30℃ (150 mm)

4.2. How the calculate refrigeration Capacity (Heat Load) of Storage Cold Room?.

To calculate the heat load first, following details shall be required

      1. Storage application or blast freezing application
      2. Room Size – Required Size (L x W x H)
      3. Required Room temperature
      4. H required for the product. (Relative Humidity)
      5. Product – Like, Milk and Milk Product, fruits, Vegetables, Meats Etc
      6. Product Quantity – Required total Quantity
      7. Puf Panel Thickness
      8. Ambient Temperature
      9. Daily Loading Quantity
      10. Product Incoming Temperature
      11. Pull Down Time (If Any)
      12. No of People working in the cold room.
      13. People working for how many hours in the cold room.


  1. Types of Cold Storage Room

5.1. Bulk Cold Storage Room

These stores are generally used for storing a single commodity that operates on a seasonal basis for example, stores for potatoes, apples, chillies, etc

5.2. Multi-Purpose Cold Storage Room

These are designed to store various commodities and products used throughout year and include different types of meat like lamb and chicken.

5.3. Frozen Food Storage Room

These food stores are design with processing and freezing facilities, optional for food items such as fish, meat, poultry, dairy products and processed food and vegetables. They are typically store around a temperature of -18C, most frozen food products are stored between 0 to minus 30ºF.

5.4. Mini Units / Walk-in Cold Storage Room

These are located at distribution centres. Walk-in cold stores can be utilised for multiple applications in the pharmaceutical, cosmetic, food and beverages, dairy & other industries for all They have a temperature range of -18 C to -22 C.

  1. Installation of Cold Storage Room

6.1. Bottom C – Channel

C – Channel used for Bottom & roof panel consist of top trapezoidal sheet with light profile. It has easy to fit male and female panel are joint supported by in built C – Channel.

6.2. Wall Panel

PUF insulation panel for the used cold rooms. So not heat losses. Suitable for diverse application. Puf panel consists of a rigid core between two metal sheet structural boards.

6.3. L – Angle for Corner

L – Angle Corner are used for Both panels are supported. Angles are used in various construction. Angles are most commonly used steel.

6.4. Roof / ceiling Panel

Ceiling Puf panel are used for roof. Puf panel insulation between two metal sheets.

6.5. Silicon

Silicon sealant for leakproof construction and for strong bonding. And not losses for heat.

6.6. Evaporator Unit / Indoor Unit.

The evaporator coil is the component in your AC system that absorbs the heat from the air inside your home.

6.7. Condensate Unit / Outdoor Unit.

Condensate unit mean outdoor unit for the used cold room. This generates refrigeration media.

6.8. Indoor & Outdoor Unit Interconnection for Copper Pipe.

Indoor and outdoor unit interconnection copper pipe used for the refrigeration system media.

6.9. Electrical Panel with Cabling & Wiring

Electrical panel used for the control the indoor and outdoor unit and interconnection cables and wiring used the for electrical current pass for both units.


    1. Reference


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