Cool the air below the dew point temperature, and the water vapor in the air will be condensed into water. Remove the condensed water and reheat it to obtain air with low humidity. The cooling source of air can use the refrigerant, ice water or brine of the refrigerator. Modern refrigeration dehumidifiers usually use special compressors for refrigeration. High standard refrigeration dehumidifier principle humidity concept. [3]
Single stage refrigeration cycle system
Single stage refrigerator is a kind of refrigerator widely used, which can be used in ice making, air conditioning, food refrigeration and industrial production processes. Single stage refrigeration cycle refers to that the refrigerant in the refrigeration system successively passes through four processes of compression, condensation, throttling and evaporation to complete the cycle of single stage refrigerator, that is, to achieve the purpose of refrigeration. The refrigeration system consists of evaporator, single-stage compressor, oil separator, condenser, ammonia accumulator, ammonia liquid separator, throttle valve and other auxiliary equipment, which are connected to each other through pipes to form a closed system. Among them, the evaporator is a device for conveying cooling capacity. After evaporation, the liquid refrigerant absorbs the heat of the cooled object to achieve refrigeration; The compressor is the heart of the system, which plays the role of absorbing, compressing and transporting refrigerant steam; The oil separator is used for settling and separating the oil in the compressed refrigerant steam; The condenser condenses the high-temperature refrigerant steam discharged from the compressor into saturated liquid; The ammonia accumulator is used to store the refrigerant ammonia liquid condensed in the condenser and regulate the supply and demand of refrigerant ammonia liquid between the condenser and evaporator; The ammonia liquid separator is an important accessory equipment in the ammonia gravity liquid supply system; The throttle valve plays the role of throttling and depressurizing the refrigerant and controls and regulates the flow of refrigerant liquid flowing into the evaporator, and divides the system into two parts: the high-pressure side and the low-pressure side.
Two stage refrigeration cycle system
The two-stage refrigeration cycle is developed on the basis of the single-stage refrigeration cycle. The compression process is divided into two stages. The refrigerant steam from the evaporator first enters the low-pressure cylinder and is compressed to the intermediate pressure. After intermediate cooling, it enters the high-pressure cylinder and is compressed to the condensing pressure and enters the condenser. Generally, when the evaporation temperature is - 25 ℃~- 50 ℃, two-stage compressor shall be used for refrigeration. The refrigeration system consists of evaporator, two-stage compressor, oil separator, condenser, intercooler, ammonia accumulator, ammonia liquid separator, throttle valve and other auxiliary equipment, which are connected to each other through pipes to form a closed system. Among them, the intercooler uses a small amount of liquid refrigerant to vaporize and absorb heat under intermediate pressure to cool the superheated steam discharged from the low-pressure stage, reduce the suction temperature of the high-pressure stage, and also cool the high-pressure liquid refrigerant.
Operating principle of refrigerant
The high-temperature gaseous refrigerant entering the condensing coil conducts heat exchange with the spray water and air outside the coil through the coil wall. The temperature of the refrigerant gas decreases with the time in the tube, and gradually changes from a gaseous state to a liquid state. 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. The temperature of spray water and air rises after absorbing the heat from the coil wall. Some water changes from liquid to gas, taking away a lot of heat from the tube wall. The moisture in the hot and humid air is intercepted by the water baffle and introduced into the PVC heat exchange layer, and the hot air is discharged. The water in the PVC heat exchange layer is cooled by the flowing fresh air, the temperature drops, flows into the collecting tank, and then is sent to the spray system by the water pump to continue the circulation. The water lost to the air is automatically adjusted and supplemented by the water level control device.
