1. Small refrigerators are generally divided into indoor and outdoor types.

 

1. Ambient temperature and humidity outside cold storage: temperature is + 35 C; relative humidity is 80%.

 

2. Setting temperature in cold storage: fresh-keeping cold storage: +5-5 C; cold storage: -5-20 C; low temperature cold storage: -25 C

 

3. Food temperature in cold storage: L grade cold storage: +30 C; D grade, J grade cold storage: +15 C.

 

4. The effective volume of the assembled cold storage is about 69% of the nominal volume, and then multiplied by a correction factor of 0.8 when storing fruits and vegetables.

 

5. The daily purchasing volume is 8-10% of the effective volume of the cold storage.

 

2. The Storage Body of Small Cold Storage

 

Small refrigerators generally use plastic-sprayed color steel plate as panel, rigid polyurethane foam plastic or high-density polystyrene as insulation material. The storage body has the characteristics of good rigidity, high strength, good thermal insulation, flame retardant and so on. Small-scale cold storage generally adopts eccentric hook connection or foaming consolidation of embedded parts in the plate wall. It is easy to assemble, disassemble and transport with good sealing. It has the advantages of small amount of construction and installation, labor-saving, good quality and quick effect. Small refrigerators are equipped with advanced refrigeration units. The storage capacity matches well with refrigeration equipment. It has fast cooling speed, energy-saving, automatic operation and safe and reliable operation. Small assembled refrigerators are widely used. The temperature range of small assembled refrigerators is 5 - 23 C. Special assembled refrigerators can reach below - 30 C. They can meet the needs of different uses and are suitable for use in various industries and departments.

 

3. Selection of Refrigeration Equipment for Small Refrigeration Storage

 

The heart of refrigeration equipment in small refrigeration depot is refrigeration unit. The common model of small refrigeration unit is advanced fluorine refrigeration equipment. Fluorine refrigeration equipment uses refrigerant R22 and other new refrigerants which have little impact on the environment. Fluorine refrigeration equipment is generally small in size, low in noise, safe and reliable, highly automated and widely applicable. It is suitable for refrigeration equipment used in small rural cold storage.

 

Refrigerators used in small refrigerators are often called refrigeration units when combined with condensers and other equipment. Refrigeration units are divided into water-cooled units and air-cooled units. Air-cooled units are the preferred form of small-scale cold storage. They are simple, compact, easy to install, easy to operate and few auxiliary equipment. This kind of refrigeration equipment is also easy to see.

 

The refrigeratory of refrigeration unit is the heart of refrigeration equipment. The common compressed refrigerators are open, semi-closed and fully closed. The fully enclosed compressor has the advantages of small volume, low noise, low power consumption, high efficiency and energy saving. It is the preferred type of small cold storage. The air-cooled refrigeration unit consisting of a fully enclosed compressor can be made into a form like split air conditioning and mounted on the wall.

 

The quality of refrigeration equipment imported from developed countries or joint ventures is relatively reliable, but the price is over 50% higher than that of domestic refrigeration compressors, which is more suitable for small refrigeration equipment in cities and towns.

 

IV. Key Design Points of Small Cold Storage

 

The temperature of cold storage is below 0 (- 16 degrees) and the small assembled cold storage needs 10 # channel steel overhead on the ground (under the warehouse plate) to make it ventilated naturally. Small cold storage, the temperature in the cold storage is 5 - 25 degrees, the cold storage plate can directly contact with the ground, but the ground should be flat. If high point is required, it can be placed under the cold storage, overhead to enhance ventilation; it can also be placed under the cold storage channel steel to enhance ventilation.

 

Suggestions on Design and Installation of Small Refrigerator Project

 

In recent years, the development of cold storage engineering construction is more and more rapid, and people's understanding of cold storage is more and more in-depth, from building materials to the choice of various cold storage equipment is becoming more and more mature. There are two kinds of common building methods in cold storage engineering, one is assembled cold storage engineering, the other is civil cold storage engineering.

 

At present, the prefabricated cold storage mostly chooses polyurethane warehouse body: the cold storage board is sandwiched with polyurethane rigid foam plastic (PU) and coated with metal materials such as steel plate, which combines the excellent thermal insulation performance and good mechanical strength of the cold storage board material. It has the characteristics of long insulation life, simple maintenance, low cost and light weight. It is one of the best materials for the selection of thermal insulation panels in cold storage. The thickness of cold storage panels is generally 150 mm and 100 mm. Most civil cold storage projects use PU polyurethane spray foam as insulation panels.

 

Freon refrigeration units, large refrigeration units with water and small refrigeration units are the main refrigeration units in refrigeration engineering. At present, the imported Bitzer refrigeration units in Germany and Meyer refrigeration units in France run smoothly with low energy consumption and low failure rate. They are the preferred refrigeration units in refrigeration depots.

 

It is very important to pay attention to the reasonable configuration of refrigeration equipment in cold storage engineering. This is because the refrigeration units with reasonable matching and reliable performance can not only meet the refrigeration capacity and storage process requirements of products, but also save energy and low failure rate. At present, some enterprises and individuals who want to build refrigerators are blindly pursuing low prices, ignoring whether the equipment configuration matching of refrigerators is reasonable, resulting in the use of refrigeration effect can not be achieved. Reasonable installation of refrigeration equipment matching the cold storage project may increase investment in the construction of cold storage, but in the long run it saves a lot of money and effort.

 

The after-sales service of refrigeration equipment is also very important, and the operation and maintenance of refrigeration equipment and technical services are equally important. Before building refrigeration depots, the vast number of construction enterprises should investigate in many ways, listen to the opinions of other enterprises on the configuration of refrigeration equipment in refrigeration depots, and finally determine the practical plan for building refrigeration depots. Make oneself establish one's own cold storage with high starting point and high standard.