Introduction to Cold Storage Refrigeration Systems

The so - called cold storage refrigeration system is a system that uses external energy to transfer heat from a low - temperature environment to a high - temperature environment and maintain the low - temperature environment within a certain range. With the continuous development of the domestic cold storage industry in recent years, there are already many types of cold storage refrigeration systems. According to the physical properties and characteristics of the cold storage refrigeration systems, different names are given to various cold storage systems.

According to the types of refrigerants used in the cold storage, the cold storage refrigeration systems can be divided into ammonia - refrigerated cold storage refrigeration systems and Freon - refrigerated cold storage refrigeration systems. According to the liquid - supply methods of the cold storage evaporators, they can be classified into gravity - fed liquid cold storage refrigeration systems, direct - expansion cold storage refrigeration systems, and liquid - pump - fed liquid cold storage refrigeration systems. According to the number of stages of the refrigeration process, they can be divided into single - stage cold storage refrigeration systems, two - stage cold storage refrigeration systems, and cascade cold storage refrigeration systems.

The single - stage cold storage refrigeration system is currently the most mature and widely used cold storage refrigeration system. At present, in China, cold storages with an evaporation temperature higher than - 30°C generally adopt the single - stage cold storage refrigeration system. Due to its simple equipment, easy management and operation, and few vulnerable parts, it is favored by many cold - using occasions.

However, due to the limitations of the cold storage refrigeration process, when the evaporation temperature of the cold storage is lower than - 33°C, a two - stage or cascade cold storage refrigeration system is generally adopted.

A cold storage refrigeration system generally consists of basic equipment such as cold storage compressors, cold storage condensers, cold storage throttling elements, cold storage evaporators, cold storage oil - separation systems, cold storage refrigerant gas - liquid separation systems, cold storage refrigerant storage systems, and valves.

The specific selection and configuration plan of cold storage equipment need to be designed and selected according to the specific process.