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    Transport Refrigeration Units Basic Composition Jun 20, 2017

    Transport Refrigeration Units Basic composition

    Basic composition of the editor

    1, the role of refrigeration compressor

    Refrigeration Compressors are the most important equipment in refrigerators, often referred to as the main unit in a refrigeration unit. Refrigerant vapor from low pressure to improve the high pressure and the continuous flow of steam, transport, are by means of the work of the refrigeration compressor to complete.

    In other words, the role of refrigeration compressor is:

    1) draw the refrigerant vapor from the evaporator to ensure a certain evaporation pressure in the evaporator.

    Cold storage unit

    Cold storage unit (2 sheets)

    2) Increase the pressure and compress the low-pressure low-temperature refrigerant vapor into high-pressure superheated superheated steam to create conditions for condensation at higher temperatures (eg about 35 ° C in summer).

    3) transport and promote the refrigerant flow in the system to complete the refrigeration cycle.

    2, according to the different types of cooling medium, the condenser can be summarized into four categories, its role is as follows:

    ⑴ water cooling type: In this type of condenser, the refrigerant released by the cooling water was taken away. Cooling water can be used once or for recycling. Water-cooled condenser according to its different structural types can be divided into vertical shell and tube, horizontal shell and tube and casing and other.

    ⑵ air-cooled (also known as air-cooled): In such a condenser, the refrigerant released by the heat away by the air. Air can be natural convection, you can also use the fan for forced flow. This type of condenser is used in frean refrigeration units where water supply is difficult or difficult.

    (3) Water-air cooling: In this type of condenser, the refrigerant is cooled by water and air at the same time, but mainly depends on the evaporation of the cooling water on the surface of the heat transfer tube, drawing a lot of heat from the side of the refrigerant as water Of the latent heat of vaporization, the role of air is mainly to speed up the evaporation of water and take away the steam. So this type of condenser water consumption is very small, for air drying, water quality, low water temperature and water is not sufficient area is the preferred type of condenser. This type of condenser according to its different types of structure can be divided into two kinds of evaporation and leaching.

    ⑷ Evaporative - Condensation: In this type of condenser, the cold effect of the evaporation of the refrigerant in the other refrigeration system is used to cool the refrigerant vapor on the other side of the heat transfer wall, causing the latter to condense and liquefy. Such as evaporative-condenser in a cascade chiller.

    3, the role of expansion valve: expansion valve from the role of throttle, the condenser condensed high-pressure refrigerant liquid through the throttle, due to obstruction caused by the pressure drop, resulting in part of the refrigerant liquid gasification, while absorption Gasification latent heat, its own temperature is correspondingly reduced, become low temperature and low pressure wet steam, and then into the evaporator.

    4, the role of the evaporator: low temperature condensation "liquid" body through the evaporator, with the outside air for heat exchange, "gas" of endothermic, to achieve the effect of cooling. Evaporator mainly by the heating chamber and evaporation chamber composed of two parts. The heating chamber provides the heat required for the evaporation of the liquid, causing the liquid to boil and vaporize; the evaporation chamber separates the gas-liquid two phases completely. The steam produced in the heating chamber is filled with a large amount of liquid foams, which are separated from the vapor by means of self-agglomerating or demulsifiers. Usually the demister is located at the top of the evaporation chamber.

    Evaporator according to the operating pressure at atmospheric pressure, pressure and decompression 3 kinds. According to the movement of the solution in the evaporator points are: ① cycle type. The boiling solution is heated several times in the heating chamber through a heated surface, such as a central circulation tube, a hanging basket type, an external heat type, a column type, and a forced circulation type. ② one-way type. The boiling solution is heated in the heating chamber at one time by heating the surface without circulation, that is, discharging the concentrate, such as the rising film type, falling film type, stirring film type and centrifugal film type. ③ direct contact type. The heating medium is in direct contact with the solution for heat transfer, such as immersion combustion evaporator. Evaporation device in the course of operation, to consume a lot of heating steam, in order to save the heating steam, can be used multi-effect evaporation device and steam recompression evaporator.