When we build a small cold storage, if we can understand some of its knowledge of material selection and design and installation, then we can better grasp a standard principle of the cold storage we want to build.
1. Small cold storages are generally divided into indoor and outdoor types
. 1. The ambient temperature and humidity outside the cold storage: temperature is +35℃; relative humidity is 80%.
2. Set temperature in cold storage: fresh-keeping cold storage: +5～-5℃; cold storage: -5～-20℃; low-temperature cold storage: -25℃
3. Food temperature in cold storage: L-level cold storage: +30℃; D Grade, J grade cold storage: +15℃.
4. The effective storage volume of the prefabricated cold storage is about 69% of the nominal volume, which is multiplied by a correction factor of 0.8 when storing fruits and vegetables.
5. The daily purchase quantity is 8-10% of the effective volume of the cold storage.
2. The body of a small cold storage is
generally made of spray-painted color steel plate as the panel, and rigid polyurethane foam is used as the insulation material. The body has the characteristics of good rigidity, high strength, good heat insulation performance, and flame retardant. The small cold storage body generally adopts the eccentric hook type connection of the embedded parts inside the panel wall or the on-site foaming and solidification, which has good airtightness and is easy to assemble and disassemble. The small cold storage is equipped with advanced refrigeration units, the storage capacity is fully matched with the refrigeration equipment, the cooling speed is fast, the power is saved, and the operation is fully automated, and the operation is safe and reliable. Small prefabricated cold storage is widely applicable, the temperature range of cold storage is 5℃ to -23℃, and the special prefabricated cold storage can reach below -30℃, which can meet the needs of different uses and is suitable for use in various industries and departments.
3. Selection of small cold storage refrigeration equipment 0
The heart of small cold storage refrigeration equipment is the refrigeration unit. The common models of small refrigeration units use advanced fluorine machine refrigeration equipment. Fluorine machine refrigeration equipment mostly uses the refrigerant R22 and others that have little impact on the environment. New refrigerant. Fluorine machine refrigeration equipment is generally small in size, low in noise, safe and reliable, high in automation, and widely applicable. It is suitable for refrigeration equipment for small rural cold storage.
The combination of refrigerators and condensers for small cold storage is often called a refrigeration unit. The refrigeration unit is divided into a water-cooled unit and an air-cooled unit. The air-cooled unit is the preferred form of small cold storage. It has the advantages of simplicity, compactness, easy installation, convenient operation, and less accessory equipment. This kind of refrigeration equipment is also relatively easy to see.
The refrigerator of the refrigeration unit is the heart of the refrigeration equipment. Common compression refrigerators are divided into open, semi-closed and fully enclosed types. The hermetic compressor has the advantages of small size, low noise, low power consumption, high efficiency and energy saving. It is the preferred model for small cold storage. The air-cooled refrigeration unit mainly composed of a fully enclosed compressor can be made into a form like a split air conditioner and mounted on the wall.
Currently, the better fully enclosed refrigeration compressors on the market, the quality of refrigeration equipment imported from developed countries or Sino-foreign joint ventures are relatively reliable, but the price is higher than that of domestic ones by more than 50%, which is more suitable for refrigeration equipment for small urban cold storage.
Fourth, the design points of small cold storage cold storage cold
storage temperature is below 0 degrees (-16 degrees) small assembled cold storage needs to set 10# channel steel overhead on the ground (under the storage board), so that it can be naturally ventilated. 9 Small cold storage, the temperature in the cold storage is 5~-25 degrees, the cold storage board can directly contact the ground, but the ground should be flat. If a high point is required, wooden slats can be placed under the cold storage to increase ventilation; channel steel can also be placed under the cold storage to enhance ventilation.
V. Cold storage engineering design and installation suggestions
In recent years, the development of cold storage engineering construction has become faster and faster, and everyone has a deeper and deeper understanding of cold storage. The choice of building materials to various cold storage equipment is becoming more and more mature. There are mainly two common construction methods for cold storage projects, one is the prefabricated cold storage project, and the other is the civil cold storage project.
At present, the prefabricated cold storages mostly choose polyurethane body: the cold storage board is made of polyurethane rigid foam (PU) as the sandwich, and the metal material such as plastic-coated steel plate is used as the surface layer. The mechanical strength is combined together. It has the characteristics of long insulation life, simple maintenance, low cost, high strength and light weight. It is one of the best materials for cold storage insulation board. The thickness of cold storage board is generally 150mm, 100mm, etc. Most of the civil cold storage projects use PU polyurethane spray foam as the insulation board.
The choice of refrigeration equipment for cold storage projects mostly uses Freon refrigeration units, large-scale cold storages use more water-cooled units, small cold storages use air-cooled units; currently imported German Bitzer cold storage refrigeration units and French Meiyoule units run smoothly, with low energy consumption and failure rate Low, it is currently the preferred unit for cold storage.
Whether the refrigeration equipment of the cold storage is properly configured is very important. This is because the refrigeration unit with reasonable matching and reliable performance can not only meet the refrigeration capacity and storage process requirements of the cold storage required by the product, but also save energy and have a low failure rate. Nowadays, some companies and individuals who want to build cold storage are blindly pursuing low prices, ignoring whether the configuration of cold storage equipment is reasonable, resulting in failure to achieve the cooling effect after use. Reasonable setting of refrigeration equipment matching the cold storage project may increase investment when building a cold storage, but in the long run it saves a lot of money and effort.
The after-sales service of cold storage equipment is also very important, as is the operation and maintenance of cold storage equipment and technical services. Before the construction of cold storage, the majority of construction companies should investigate in many aspects, listen to other companies’ opinions on the configuration of cold storage refrigeration equipment, and finally determine a practical cold storage plan. Make yourself build your own cold storage with a high starting point and high standards, and strive for the best benefits for yourself.