1. Small refrigerators are generally divided into two types: indoor type and outdoor type
(1) Temperature and humidity outside the cold room: the temperature is +35°C; the relative humidity is 80%.
(2) The set temperature in the cold room: fresh-keeping cold room: +5～-5℃; refrigerated cold room: -5～-20℃; low temperature cold room: -25℃
(3) The temperature of food entering the cold room: L-level cold room: +30 °C; D-level and J-level cold room: +15 °C.
(4) The useful volume of stacked cold room is about 69% of the nominal volume, and it is multiplied by a correction factor of 0.8 when storing fruits and vegetables.
5) The daily purchase volume is 8-10% of the useful volume of the cold room.
2. The body of the small cold room
Usually, spray-painted color steel plate is used as the panel, and rigid polyurethane foam or high-density polystyrene is used as the thermal insulation material.
Small cold room generally adopts hook-type connection or on-site foaming and fixing for the embedded parts inside the recycled panel wall, which has good sealing performance and is easy to assemble, disassemble and transport. The small cold room is equipped with an advanced refrigeration unit, the storage capacity and the refrigeration equipment are fully matched, the cooling rate is fast, power saving and energy saving, and all automatic operations, the operation is stable and reliable. Small prefabricated cold room is widely used, the temperature range of cold room is 5°C--23°C, and the special prefabricated cold room can reach below -30°C, which can meet the needs of different applications and is suitable for use in various industries.
3. Selection of refrigeration equipment for small cold room
The heart of small cold room refrigeration equipment is the refrigeration unit. The commonly used models for small refrigeration units use advanced fluorine machine refrigeration equipment. The operation of fluorine machine refrigeration equipment has little effect on the environment. The refrigerant R22 and other new refrigerants. Fluorine machine refrigeration equipment is generally small in size, low in noise, safe and reliable, high in automation, and widely used in a wide range of applications. It is suitable for refrigeration equipment used in small refrigerators in villages.
The combination of refrigerators and condensers and other equipment used in small cold rooms is often called refrigeration units. The refrigeration units are divided into water-cooled units and air-cooled units. The air-cooled unit is the first choice for small cold room, which has the advantages of simplicity, compactness, easy installation, convenient operation, and less subordinate 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 type, semi-closed type and fully closed type. The fully closed compressor has small size, low noise, low power consumption, high efficiency and energy saving. It is the first choice for small refrigerators. It is an air-cooled refrigeration unit mainly composed of a fully closed compressor. It can be made into a form like a split air conditioner and mounted on the wall.
At present, the best fully-closed refrigeration compressors on the market are reliable in terms of the quality of refrigeration equipment imported from the country or from Sino-foreign partnerships, but the value is more than 50% higher than that of domestic refrigeration equipment.
4. The design points of small cold room
The cold room temperature is below 0 degrees (-16 degrees), and the small prefabricated cold room needs to be repelled by 10# channel steel on the ground (under the storage board), so that it can be naturally ventilated. Small cold room, the temperature in the cold room is 5~-25 degrees, the cold room board can directly contact the ground, but the ground should be flat. If a high point is required, wooden strips can be arranged under the cold room to prevent ventilation to enhance ventilation; channel steel can also be arranged under the cold room to enhance ventilation.
5. Cold room engineering design and installation proposal
In recent years, the construction of cold room projects has grown faster and faster, and everyone's familiarity with cold room has become more and more in-depth. It is speculated from the construction quality that the selection of various types of cold room equipment is becoming more and more mature. There are two common construction methods for cold room projects, one is the prefabricated cold room project, and the other is the civil cold room project.
At present, the prefabricated cold room mostly chooses the polyurethane storage body: that is, the cold room 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, so that the cold room board has good thermal insulation performance and excellent performance. The strength of the machine unites all the way. It has the characteristics of long thermal insulation life, simple maintenance, low cost, high strength and light weight. Most of the civil cold room projects use PU polyurethane spray foam as the thermal insulation board.
It is extremely important whether the refrigeration equipment of the cold room is reasonable. This is because the refrigeration unit with reasonable and reliable performance can not only meet the refrigeration capacity of the cold room and the technical requirements of the cold room required by the product, but also save energy and reduce the failure rate. At present, some companies and individuals who want to build cold rooms blindly pursue low value, ignoring whether the matching of cold room equipment is reasonable, resulting in failure to achieve cooling results after use. Reasonable configuration and matching refrigeration equipment for cold room projects may increase investment when building cold room, but in the long run, it saves a lot of money and effort.
The after-sales service of cold room equipment is also very important, and the operation and maintenance of cold room equipment and technical services are equally important. Generous warehouse construction enterprises should examine various aspects in the early years of building cold room, listen to the opinions of other enterprises on the setting of cold room refrigeration equipment, and finally determine a practical cold room plan. Set up your own cold room with a high starting point and a high scale, and strive for the best benefits for yourself.
Post time: Nov-09-2022