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Freezer, industrial refrigeration unit, working principle of freezing unit, video of working principle of freezer, maintenance of freezer
Freezer, industrial refrigeration unit, working principle of freezing unit, video of working principle of freezer, maintenance of freezer
[Introduction to the working principle of refrigeration units!]
Release date:[2020/4/29] Is reading[53]次

Introduction to the working principle of refrigeration units!


   Analysis of the working principle of the refrigeration unit: The two-stage refrigeration cycle is developed on the basis of the single-stage refrigeration cycle. The compression process is carried out in two stages. The refrigerant vapor from the evaporator first enters the low-pressure stage cylinder and is compressed to an intermediate pressure. After intermediate cooling, it enters the high-pressure cylinder and compresses to the condensing pressure and enters the condenser. Generally, when the evaporation temperature is between -25 ℃ and -50 ℃, a two-stage compressor should be used for refrigeration. The Kolod mechanical refrigeration unit system is composed of an evaporator, a two-stage compressor, an oil separator, a condenser, an intercooler, an ammonia storage, an ammonia liquid separator, a throttle valve, and other ancillary equipment. Connected into a closed system. Among them, the intercooler uses a small amount of liquid refrigerant to vaporize and absorb heat at intermediate pressure, so that the superheated steam discharged from the low-pressure stage is cooled, the suction temperature of the high-pressure stage is lowered, and the high-pressure liquid refrigerant is also cooled.


   The single-stage refrigeration unit is a type of refrigerator that is widely used. It can be used in ice making, air conditioning, food refrigeration and industrial production processes. The single-stage refrigeration cycle means that the refrigerant passes through the four processes of compression, condensation, throttling, and evaporation successively in the refrigeration system, thus completing the cycle of the single-stage refrigerator, that is, the purpose of refrigeration is achieved.


   The refrigeration unit consists of an evaporator, a single-stage compressor, an oil separator, a condenser, an ammonia reservoir, an ammonia liquid separator, a throttle valve, and other ancillary equipment. They are connected to each other through a tube to form a closed system. Among them, the evaporator is a device that transports cooling capacity. The liquid refrigerant evaporates and absorbs the heat of the cooled object to achieve refrigeration; the compressor is the heart of the system, which plays the role of sucking, compressing, and transporting refrigerant vapor; Separate the oil in the compressed refrigerant vapor; Kolod Seiki condenser condenses the high-temperature refrigerant vapor discharged from the compressor into a saturated liquid; the ammonia reservoir is used to store the refrigerant ammonia liquid condensed in the condenser and adjust the condenser The supply and demand relationship of refrigerant ammonia liquid with the evaporator; the ammonia liquid separator is an important auxiliary equipment in the ammonia gravity liquid supply system; the throttle valve throttles and reduces the pressure of the refrigerant and simultaneously controls and regulates the cooling into the evaporator. The flow of the agent liquid, and divide the system into two parts of high pressure side and low pressure side.


   Operation principle of evaporative condenser


   The high-temperature gas refrigerant entering the condensation coil exchanges heat with spray water and air through the coil wall and the outside of the coil. The temperature of the refrigerant gas decreases with the length of time in the tube, and gradually changes from gas to liquid. The super strong wind force of the fan makes the spray water fully cover the outer surface of the coil, thereby improving the heat exchange efficiency. After spray water and air absorb the heat of the coil wall, the temperature rises, part of the water changes from liquid to gas, and takes away a lot of heat on the wall of the tube. , Hot air is discharged. The water in the PVC heat exchange layer is cooled by the fresh air flowing through, the temperature is lowered, it flows into the sump, and then it is sent into the spray system by the water pump, and continues to circulate. The water lost to the air is automatically adjusted and replenished by the water level control device.


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