What are the main equipments of cold storage?Are the equipments of 0~6℃ constant temperature cold storage and -20~-27℃ freezing cold storage the same? It is best to list the main equipment.

General cold storage mostly by the refrigerator refrigeration, the use of gasification temperature is very low liquid (ammonia or Freon) as a coolant, so that it evaporates under the conditions of low pressure and mechanical control, absorbing the heat inside the reservoir, so as to achieve the purpose of cooling down the temperature. The most commonly used is the compression type refrigerator, mainly by the compressor, condenser, throttle valve and evaporation tube and other components. According to the way of evaporator tube device can be divided into direct cooling and indirect cooling two kinds. Direct cooling will evaporate the tube installed in the refrigerated warehouse, liquid coolant through the throttle valve, direct absorption of heat in the warehouse and cooling. Indirect cooling is by the blower will be the warehouse air suction into the air cooling device, air is hovering in the cooling device evaporator tube heat absorption, and then sent to the warehouse and cooling. The advantage of the air cooling method is rapid cooling, the temperature inside the warehouse is more uniform, at the same time can be produced in the storage process of carbon dioxide and other harmful gases out of the warehouse.

Parallel compressor in the use of cold storage:

1) refrigeration capacity requirements, usually need to use 5 to 50 sets of 20 horsepower refrigeration compressor

2) year-round operation, load peaks and valleys, part of the load is obvious

3) freezing, refrigerated objects are perishable fresh food, the temperature and humidity control requirements are strict

4) evaporative cooling, the temperature and humidity control requirements

5) the temperature of the refrigerator, the temperature is very high, the temperature is very high. p>

4) the evaporator needs defrosting, and defrosting cycle after the system load is very large China's commercial refrigeration system in the process of development of large-scale, stand-alone system has been gradually unable to adapt to the demand for large-scale refrigeration applications,

This is mainly manifested in:

1) the number of units is more, the cost is high, and occupies too much space, affecting the aesthetics and commercial land use planning

2) Peak adjustment Weak capacity, usually the compressor is configured according to the maximum load, in part-load compressor due to energy regulation (hot gas bypass, etc.) in the part-load case of inefficiency. In order to prevent frequent startups in part-load conditions, often using a time delay, but this often results in the compressor running in poor operating conditions, the efficiency of the decline, if you do not add a time delay will result in frequent compressor start and stop to reduce the life of the compressor

3) on the automatic control of temperature and humidity is more difficult to use the pressure controller, suction pressure fluctuations