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Briefly describe the working principle of the freezer


When the air is cooled below the dew point temperature, the water vapor in the air condenses into water. By removing the condensate and reheating, low-humidity air can be obtained. The source of air cooling can be the refrigerant, ice water or brine of the freezer. Modern refrigerated dehumidifiers usually use a special compressor for refrigeration dehumidifiers. High standard freezing dehumidifier principle humidity concept.

Single-stage refrigeration cycle system

Single-stage refrigerator is a relatively widely used type of refrigerator, which can be used in ice making, air conditioning, food refrigeration, and industrial production processes. Single-stage refrigeration cycle means that the refrigerant in the refrigeration system successively undergoes four processes of compression, condensation, throttling, and evaporation to complete the cycle of the single-stage refrigerator, that is, the purpose of refrigeration is achieved. The refrigeration system 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 pipes to form a closed system. Among them, the evaporator is a device that transports cold energy. After the liquid refrigerant evaporates, it absorbs the heat of the object to be cooled. The compressor is the heart of the system, which plays the role of sucking, compressing, and transmitting the refrigerant vapor. The oil separator is used for sedimentation. Separate the oil in the compressed refrigerant vapor; the condenser condenses the high-temperature refrigerant vapor discharged from the compressor into a saturated liquid; the ammonia reservoir is used to store the ammonia liquid of the refrigerant condensed in the condenser, and adjusts between the condenser and the evaporator Supply and demand relationship of refrigerant ammonia liquid; ammonia liquid separator is an important auxiliary equipment in ammonia gravity liquid supply system; throttle valve plays a role of throttling and reducing the pressure of refrigerant while controlling and adjusting the flow of refrigerant liquid flowing into the evaporator. The system is divided into two parts: high-pressure side and low-pressure side.

Two-stage refrigeration cycle system

The two-stage refrigeration cycle is developed on the basis of a single-stage refrigeration cycle. Its compression process is carried out in two stages. The refrigerant vapor from the evaporator first enters the low-pressure cylinder to be compressed to intermediate pressure, and then enters high pressure after intermediate cooling. Stage cylinder, compressed to condensing pressure and entering the condenser. Generally, when the evaporation temperature is -25 ℃ ~ -50 ℃, a two-stage compressor should be used for refrigeration. The refrigeration system consists of an evaporator, a two-stage compressor, an oil separator, a condenser, an intercooler, an ammonia reservoir, an ammonia liquid separator, a throttle valve and other ancillary equipment. They are connected by pipes to form 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 intake temperature of the high-pressure stage is reduced, and the high-pressure liquid refrigerant is also cooled.

Operating principle of refrigerant

The high-temperature gaseous refrigerant entering the condensing coil is sprayed with water and air through the wall of the coil to exchange heat with the outside of the coil. The temperature of the refrigerant gas decreases with the length of time in the tube, and gradually changes from gaseous to liquid. The fan uses super strong wind to make the spray water fully cover the outer surface of the coil, thereby improving the heat exchange efficiency. After spraying water and air to absorb the heat from the coil wall, the temperature rises, and some of the water changes from liquid to gaseous, taking away a lot of heat from the tube wall. The moisture in the hot and humid air is intercepted by the baffle and introduced into the PVC heat exchange layer. , Hot air is discharged. The water in the PVC heat exchange layer is cooled by the fresh air flowing through it, the temperature is reduced, flows into the water collecting tank, and then is pumped into the spray system by the water pump to continue the circulation. The water lost to the air is automatically adjusted and replenished by the water level control device.

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