Must three-phase electricity be used to build a cold storage

Must three-phase electricity be used to build a cold storage

It is becoming more and more common to rebuild unused vacancies in rural areas, such as fruit fresh-keeping cold storage or meat cold storage. Recently, the okmarts.com editor often asked the question of whether the cold storage power supply can be directly supplied by 220V civilian electricity. Go to change the three-phase power to 380V. Generally, if the cold storage is very small (such as a warehouse with a size of five or six square meters), it can also be powered by 220V civilian electricity, but it is recommended to use three-phase electricity.

Must three-phase electricity be used to build a cold storage?

　　 1. What is three-phase electricity?

　　 Three-phase power is the abbreviation of three-phase alternating current. It is a form of electric energy transmission. It is composed of three alternating current potentials with the same frequency, equal amplitude and 120° phase difference. Three-phase electricity is often used in industrial AC power equipment such as motors. This is because three-phase electricity (380V) can transmit power better than single-phase electricity (220V) and save power equipment investment.

　　 2. Why do cold storage use three-phase electricity?

　　The cold storage is a low-temperature warehouse environment that is artificially realized by the configuration of mechanical equipment and other equipment. It is often used for the storage and preservation of perishable foods such as fruits, vegetables and meat. Among them, the refrigeration unit is the core component of the cold storage, and it is responsible for achieving and maintaining the stable low temperature of the cold storage. The cold storage engineering company configures refrigeration units that can meet actual needs according to the size of the warehouse (length * width * height), warehouse temperature, and sunrise storage frequency. Generally, the larger the warehouse, the lower the temperature of the cold storage, the greater the power of the cooling unit.

　　The largest cooling unit supported by single-phase electricity (220V) is 4P, so it is only suitable for small warehouse environments (such as five or six square meters). For example, a 30 to 40 square meters (about 100 cubic meters) fruit and vegetable fresh-keeping cold storage will be equipped with 6P and above refrigeration units, and a 30 to 40 square meters (about 100 cubic meters) meat freezer will be equipped with 8P and above refrigeration units. In this way, single-phase electricity (220V) cannot drive the operation of the refrigeration unit to achieve cold storage refrigeration.

　　 3. Why is the small cold storage also easy to use three-phase electricity?

Although single-phase electricity (220V) can meet the power supply requirements of a small cold storage of five or six square meters, the cold storage refrigeration unit may be frequently started due to actual conditions such as the temperature difference between the inside and outside of the cold storage, the change in the volume of goods in the warehouse, and the insulation performance of the warehouse. In a higher operating power state, electricity consumption is relatively large. The use of three-phase electricity can not only transmit power well, but also reduce the energy consumption of cold storage, and better improve the input-output ratio of cold storage construction.