The purpose of presenting a justification plan for the construction of a two-way cold storage is to provide a text to become more familiar with the honey packaging industry.
In our country and other developing countries, as well as in third world countries, while the shortage of aggregate supply versus aggregate demand is quite palpable.
بSignificant scratches on agricultural and processed products are eliminated due to insufficient care. Relevant organizations and ministries estimate this amount to be between 25 and 50% of the total. I hope you will be with Iran Sanat until the end of the article.
In this way, the gap between supply and demand is widened. Will be significantly reduced.
Warehousing and cold storage activities, although not very important in terms of creating added value and employment in our country’s economy, but its existence is a necessity.
So that the facilities of this activity can be considered as the infrastructure of the country, expansion of factories and production of raw and processed food, mismatch between time and place of consumption and domestic production of goods, non-compliance with the time of import and import of goods and their consumption (wheat, oil) The strategic needs of the country, the need to maintain some of the materials and goods needed for the production line process of economic units, the characteristics of the internal and external exchange system and… are among the factors that indicate the need for warehousing and cold storage and its relative importance in the country’s economic performance.
Definition of refrigerator:
Closed space is a fixed or moving space that has a system or refrigeration device.
Two-stage refrigerator:
It is a refrigerator that provides special storage conditions such as: high temperature or below the freezing point of food, at least -18 degrees Celsius, relative temperature and, if necessary, other items.
Types of refrigeration technically
Technically, refrigeration systems are classified as follows:
A – Cooling:
1. Cold Room above zero (2 to 10 degrees Celsius) Cold Room: A refrigerator that provides special storage conditions such as high temperature of the freezing point (freezing), relative temperature and, if necessary, other items (such as treatment of grapes with SO2).
2. Freezer Room below zero (0 to -30 degrees Celsius): Freezer Room: A refrigerator that has special storage conditions such as temperature below the minimum freezing point of -18 degrees Celsius, relative temperature and, if necessary, other items (such as freezing food) ) Provides.
3. Ultra-low Freezer Room (-10 to -40 degrees Celsius)
4. Peripheral isolated canopy (0 to 50 degrees Celsius) Chambre
B – Humidity:
1. Without humidity control
2.95% RH limited to dew point c 400 and 30 c
3. Chemical dryer system with extremely low humidity for use in special cases
C – Building:
1. One-piece canopy (without holes)
2. Separation of space using sandwich panels
3. Insulation of traditional buildings
Some refrigeration applications
– Refrigerator for food storage (fruits, vegetables, meat, dairy and all kinds of food products)
– Storage of medicine – vaccine
Blood Bank (Plasma Freezer)
– Environmental test room, chambre
– Mobile shed can be installed on all types of trailers, vans, vans and….
– Mobile hut with the ability to move with a tractor or crane (without the need for dismantling)
– Flower storage (humidity controlled)
Features of refrigerators
A: System control:
All system operations and control switches are located in one panel. The operating conditions of the system can be seen by the indicator lights installed on the panel. The steel box with hinged door protects the electrical system from dust and environmental pollution as well as possible accidental shocks.
Alarm: In case of customer need, the alarm is to ensure the maintenance of the temperature range. The alarm system operates completely independent of the electrical system and by directly measuring the ambient temperature, if the temperature is outside the desired range, the command sounds It issues a siren and the siren sounds until the operator resets the system.
In addition, all systems are equipped with another alarm that is activated by pressing the red button installed inside the refrigerator. When a person is trapped inside the refrigerator for any reason, by pressing this button, the siren sounds and sounds an alarm.
B: Building:
1- One-piece sheds: Using one-piece sheds has the advantage of relocation without the need for dismantling.
All physical components (walls, floor, ceiling and door) are made in one piece, depending on the customer’s choice of pre-painted galvanized sheets or steel for interior and exterior walls. Polyurethane insulation with a minimum density of 340 kg / m by European High Pressure machines automatically It is injected between the inner and outer wall.
If there is a need to move later, it can be easily transported by a tractor or crane.
2- Canopy made of polyurethane (PU) sandwich panel:
The use of prefabricated panels, which are produced as sandwich panels, includes other benefits that are as follows:
– Quick and easy assembly and disassembly
– Polyurethane insulation with a minimum density of 340 kg / m3 with high thermal and compressive strength
Exterior and interior walls are made of pre-painted galvanized sheet or steel.
– Ability to increase and decrease space
– Possibility to change the location of the entrance door or increase the number of doors
It is noteworthy that sandwich panels are made in the dimensions of 196 cm * 96 cm and their thickness varies depending on the application. The structure of sandwich panels is visible in the figure.
The specific thermal conductivity (k) of BTU / Hr / sq.ft polyurethane foam is 0.12 and the heat transfer capacity (u) of this material is less than 0.03.
Some of the sandwich panels on the market are made by gluing and pressing our polyurethane sheet between two metal plates, which is not recommended at all, because the sheet is usually deformed at high pressure and humidity, followed by the whole sandwich. The panel becomes defective.
A: Cooling system:
1- Using different types of hermetic (Hermetic) and semi-hermetic (Semi Hermetic) screw and scroll compressors with reputable brands Maneurope, Bitzer, DWM….
2- The possibility of using different types of cold and air-cooled condensers in different capacities depending on the tonnage and climatic zone.
3- All cooling circuit pipes are assembled with high percentage silver welding.
4- Equipped with High & Low system to control the high and low pressure of the system to prevent possible damage to the compressor.
5- Using the expansion valve (expansion valve) suitable by performing the calculation for accurate selection.
6- Using different types of traps, accumulators, filters, dryers and oil separators to prevent oil and foreign objects from entering the compressor and thus increasing the life of the cooling system.
7- Equipped with Defrost system to perform defrosting operations automatically.
8- Using doors with external fittings and sealing with high quality sealing tape.
Source: Iran Sanat
