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    Transport Refrigeration Units Refrigeration System Components Jul 12, 2017

    Transport Refrigeration Units Refrigeration system components

    Refrigerating vehicle refrigeration system components and basic working principle

    General refrigeration principle of the compressor The role of the compressor is to lower the pressure of the steam pressure into the higher pressure of steam, so that the volume of steam reduced, the pressure increased. The compressor draws the lower pressure of the refrigerant from the evaporator, so that the pressure is increased and then sent to the condenser, condensed into a higher pressure liquid in the condenser, after the throttle valve throttling, become the pressure Low liquid, into the evaporator, in the evaporator heat absorption and become a low pressure steam, and then into the compressor inlet, thus completing the refrigeration cycle.

    Composition and component use

    Refrigeration system consists of refrigerant and four mechanical parts, namely, compressor, condenser, expansion valve, evaporator composition. compressor

    Compressor is the power of the refrigeration cycle, which is dragged by the motor and constantly rotating, in addition to its timely extraction of evaporator vapor, to maintain low temperature and low pressure, but also by compression to improve the pressure and temperature of the refrigerant vapor to create the refrigerant The condition of the heat transfer of the vapor to the outside environment. The low-temperature low-pressure refrigerant vapor is compressed to a high temperature and high pressure state so that the refrigerant vapor can be condensed with normal air or water as a cooling medium.

    ● Condenser

    The condenser is a heat exchange device which utilizes ambient cooling medium (air or water) to remove the heat from the high temperature and high pressure refrigeration vapor of the cold compressor, cool the high temperature and high pressure refrigerant vapor and condense into the refrigerant at high pressure liquid. It is worth mentioning that the condenser in the refrigerant vapor into refrigerant liquid process, the pressure is constant, still high pressure.

    ● Throttle element (ie expansion valve)

    High pressure normal temperature refrigerant liquid is not directly into the low temperature scale evaporator, according to the saturation pressure and saturation temperature - the corresponding principle, reduce the pressure of the refrigerant liquid, thereby reducing the temperature of the refrigerant liquid. The high-pressure room temperature refrigerant liquid through the anti-pressure device - throttle components, low-temperature low-pressure refrigerant, and then into the evaporator heat absorption. In daily life in the refrigerator, air conditioning commonly used capillary as a throttle element.

    ● Evaporator

    The evaporator is also a heat exchange device. After the throttling of the low-temperature low-pressure refrigerant liquid in its evaporation (boiling) into steam, heat the material to be cooled, so that the temperature of the material to achieve the purpose of freezing, frozen food. In the air conditioner, the cooling of the surrounding air, to the air cooling, dehumidification effect. The lower the evaporation temperature of the refrigerant in the evaporator, the lower the temperature of the coolant. In the refrigerator, the general temperature of the refrigerant is adjusted from -26 ° C to -20 ° C and adjusted at 5 ° C to 8 ° C in the air conditioner.

    ● Steam compression refrigeration principle

    Single-stage steam compression refrigeration system, by the refrigeration compressor, condenser, evaporator and throttle four basic components. They are connected in turn by the pipeline to form a closed system, the refrigerant in the system continue to flow, the state changes, with the outside world for heat exchange.

    The liquid refrigerant absorbs the heat of the cooled object in the evaporator, vaporizes it into low temperature and low pressure steam, is sucked by the compressor, compressed into high pressure high temperature steam and discharged into the condenser, and in the condenser to the cooling medium (water or air ) Exothermic, condensed into high-pressure liquid, the throttle valve throttling low-pressure low-temperature refrigerant, re-enter the evaporator heat absorption vaporization, to achieve the purpose of circulating cooling. In this way, the refrigerant in the system through the evaporation, compression, condensation, throttling four basic processes to complete a refrigeration cycle.

    In the refrigeration system, the evaporator, condenser, compressor and throttle valve is essential in the refrigeration system of four pieces, which is the evaporator is the cooling capacity of the equipment. The refrigerant absorbs the heat of the cooled object therein to achieve refrigeration. The compressor is the heart, plays the role of inhalation, compression, and delivery of refrigerant vapor. The condenser is a device that emits heat, passing the heat absorbed in the evaporator together with the heat transferred from the compressor work to the cooling medium.