Organization of proper storage of perishable products in large volumes requires not just a household refrigerator, but a full-fledged isolated room, known as refrigerator room. The creation of such a design allows businesses in the field of catering, logistics and trade to maintain ideal temperature conditions for various groups of goods. The question of how to make a refrigerator room yourself often arises before small business owners who want to save money on ready-made turnkey solutions.
The construction process requires accurate engineering calculations, understanding of the principles of thermophysics and compliance with building codes. Chamber refrigerator is a complex system where tightness and the quality of thermal insulation play a decisive role in energy efficiency. Errors at the design stage can lead to significant waste of electricity and failure of expensive equipment.
In this article we will analyze in detail all the stages of creating a stationary refrigeration chamber: from choosing a location and materials to installing a refrigeration unit. You will learn what nuances exist when assembling sandwich panels, how to correctly calculate heat inflows and why it is important to follow the technology when sealing seams.
Selecting a location and preparing the room
The first and critically important stage is choosing the place where the future one will be located fridge compartment. The room must be dry, protected from direct sunlight and have a level floor capable of supporting the weight of equipment and products. Ideally, the refrigerator room will be located in the basement or on the north side of the building, which minimizes external heat inflows.
It is necessary to ensure free access to the installation site for the delivery of materials and subsequent maintenance of the equipment. Stationary refrigerator requires an electricity supply of appropriate power, therefore proximity to the electrical panel is an important factor. It is also necessary to provide for the possibility of organizing ventilation for the operation of condenser units.
⚠️ Attention: It is strictly forbidden to install refrigeration equipment in rooms with an aggressive environment, high humidity without exhaust or in close proximity to sources of open fire and heating devices.
If you plan to place the camera outdoors or in an unheated hangar, you will need additional protection of the structure from precipitation and environmental temperature changes. In such cases, an additional canopy or light frame is often erected to serve as a buffer zone. Preparation of the base is the foundation on which the entire structure rests, and this stage cannot be ignored.
Calculation of dimensions and selection of thermal insulation materials
The dimensions of the future chamber are determined by the planned storage volume and the dimensions of the pallets that will be used. Standard ceiling heights are usually from 2.2 to 3 meters, which allows for efficient use of vertical space. To calculate the power of the refrigeration unit it is necessary to know the exact volume of the room, since the air exchange rate and cooling rate depend on this.
The main material for the construction of walls, floors and ceilings are sandwich panels. The most common insulation is polyurethane foam (PPU) with a density of 40-45 kg/m³, which has a minimum thermal conductivity coefficient. PPU panels light, durable and does not absorb moisture, which makes them ideal for low-temperature chambers.
For for medium-temperature chambers (from 0 to +10°C) the thickness of the panels is usually 100 mm, and for low-temperature chambers (freezing to -25°C and below) - 150 mm or 200 mm. There are also panels filled with expanded polystyrene, but they are inferior to polyurethane foam in terms of thermal insulation properties and fire safety. The choice of thickness directly affects energy consumption: the thinner the wall, the more intense the compressor will work.
Comparison of insulation materials
Polyurethane foam (PPU) has a closed cellular structure, does not absorb water and has better thermal insulation. Expanded polystyrene (EPS) is cheaper, but is hygroscopic and less durable under conditions of cyclic freezing and defrosting.
When calculating the surface area, it is necessary to take into account not only the walls, but also the floor and ceiling, since heat flows from all sides. An accurate calculation will allow you to avoid purchasing an excess amount of materials or, conversely, a shortage of panels in the midst of installation.
Installation of the frame and assembly of sandwich panels
Assembling the structure begins with the installation of corner panels and floor panels. The floor is often made of high-density sandwich panels (more than 100 kg/m³) or filled with concrete screed, followed by laying insulation. If a panel floor is used, waterproofing and a leveling underlay must be laid underneath it. The joints of the panels are treated with silicone sealant for food production before joining.
The panels are connected using a tongue-and-groove or eccentric lock type locking connection. To seal the joints, a special silicone sealantis used, which retains elasticity at low temperatures. The walls are installed sequentially, row by row, with a mandatory level check for verticality. Horizontal joints are also coated with sealant.
☑️ Frame assembly checklist
Ceiling panels are installed after the walls are erected. If the ceiling span is large, it may be necessary to install additional support columns or hangers to prevent the structure from sagging. All external corners are covered with aluminum profiles, which protect the insulation from mechanical damage and provide additional tightness. It is also recommended to cover the internal corners with special profiles to facilitate sanitary processing.
⚠️ Attention: When installing the panels, you cannot use metal fasteners that create “cold bridges” through the entire thickness of the wall. All fastenings must be hidden or compensated by heat-insulating bushings.
Particular attention should be paid to the installation of doors. The doorway is formed from special door panels or assembled from reinforced wall panels. Refrigeration doors must have its own heating circuit to prevent the panel from freezing to the frame in winter. Door installation requires high precision, since distortions will lead to a loose fit and loss of cold.
Base structure and floor insulation
High-quality floor insulation is one of the key factors for the success of the entire operation. If the floor is not insulated, the cold will go into the ground or concrete base, which will lead to freezing of the building's foundation and the formation of condensation. For low-temperature chambers, a soil heating system is often used to prevent soil heaving.
The floor structure can be made in the form of a “floating” floor made of high-density sandwich panels covered with corrugated aluminum or stainless steel. An alternative option is to pour a concrete screed over a layer of extruded polystyrene foam. In this case, it is important to perform high-quality waterproofing before laying the insulation, so that capillary moisture does not destroy the structure.
The thickness of the floor insulation should be no less than that of the walls, and for low-temperature chambers even greater. The floor load is calculated based on the weight of the racking systems and the maximum stock of products. Often, embedded parts are installed into the floor to secure shelving, which requires planning at the earliest stages.
Joints between floor panels and walls are sealed using a special profile and silicone. It is important to create a continuous thermal insulation circuit without breaks. Any gap in the floor will become a source of energy loss and can lead to local freezing and destruction of the coating in the future.
Selection and installation of refrigeration equipment
The heart of any refrigeration chamber is a refrigeration unit, consisting of a compressor-condensing unit and an air cooler (evaporator). The power of the equipment is selected strictly according to the calculation of heat inflows, which takes into account the volume of the chamber, the frequency of loading, the ambient temperature and the required temperature regime. Using the unit “by eye” is unacceptable.
For medium-temperature chambers, monoblock or split systems are often used. Split system consists of two blocks: a compressor (installed outside) and an evaporation unit (inside the chamber). This allows you to reduce noise inside the room and move the heat generated by the condenser outside the chamber. Compressor-condensing units are air and water cooled.
| Equipment type | Temperature conditions | Installation location | Features |
|---|---|---|---|
| Monoblock | Medium/Low | Wall/panel insertion | Easy installation, high noise |
| Split system | Any | Separately (inside/outside) | Quiet operation, more difficult installation |
| Central | Industrial | Separate room | For several chambers, reliability |
The evaporator inside the chamber must be installed in such a way as to ensure proper air circulation. Do not block air flow with products or shelving. Refrigerant piping is laid on slopes to return oil to the compressor. All pipe connections must be made by soldering in a nitrogen environment or using high-quality fittings.
Electrics, automation and commissioning
The power supply to the refrigeration chamber must be provided with a cable of the appropriate cross-section, designed for the starting currents of the compressor. It is mandatory to have a residual current device (RCD) and motor protection circuit breakers. The connection diagram must provide a separate line for heating the doors and the evaporator, if it is not integrated into the overall control circuit.
Modern control controllers allow you to accurately set temperature conditions, configure defrost cycles and monitor the state of the system. Temperature sensors should be placed in areas where the air temperature is most representative of the entire chamber volume, usually away from the door and evaporator. Setting the compressor on/off delta affects temperature stability and equipment life.
After installation is completed, the system is evacuated to remove moisture and air, then recharged with refrigerant. The launch is carried out in test mode, checking all functions: fan operation, defrost cycles, emergency mode signaling. It is important to make sure that the doors close tightly and that there is no leakage of warm air.
⚠️ Attention: Work with refrigerants and 380V electrical networks should only be performed by qualified specialists with the appropriate approval. Self-filling with freon without evacuation will lead to compressor breakdown.
The final stage is putting the facility into operation and instructing personnel. Users should be aware of chamber loading procedures, sanitization frequency, and alarm procedures. Regular maintenance, including cleaning the condenser and checking the door seals, will extend the service life room refrigerator for many years.
Frequently asked questions (FAQ)
How long does it take to assemble a standard fridge compartment?
Assembling a frame from sandwich panels for a chamber with a volume of up to 20 m³ takes 1-2 days by a team of 2-3 people. Installation of refrigeration equipment and commissioning work require another 1 day. Thus, the full cycle takes about 3 working days if all materials are available.
Is it necessary to register the refrigeration chamber with the supervisory authorities?
The design itself does not require registration. However, if equipment with a certain refrigerant volume or system pressure is used, periodic industrial safety inspections may be required. For food production, regular sanitization and temperature logs are required.
Is it possible to convert an ordinary room into a refrigerator?
Technically this is possible, but it is often not economically feasible. It is easier and cheaper to dismantle old walls and assemble new ones from sandwich panels than to try to insulate brick walls from the inside, fighting dew point and condensation. Ready-made panels provide better tightness.
What is the approximate cost of creating a chamber with your own hands?
The cost consists of the price of the panels (about 60-70% of the budget), refrigeration equipment (20-25%) and components (doors, profiles, electrical). Self-installation allows you to save up to 30-40% of the cost of a ready-made turnkey solution, but requires skills and tools.
How often do you need to defrost the chamber?
Modern cameras are equipped with an automatic defrosting system (heating elements or hot gas), which is turned on by a timer or by a sensor signal. Manual defrosting is rarely required, only in case of automatic malfunction or severe icing, usually 1-2 times a year during scheduled maintenance.