The refrigerant itself is circulated in the refrigeration system, and then through its own state changes to achieve refrigeration. The refrigerant absorbs the heat of the cooled medium in the evaporator and vaporizes it, transferring heat to the surrounding air or water in the condenser and condensing. When the air-cooled chiller refrigeration cycle system is running, the same can not be separated from the refrigerant. Refrigerant It is in the air-cooled chiller circulation system in the non-stop flow, and its state is constantly changing, therefore, the refrigerant in the air-cooled chiller refrigeration system at each location of the state are different The So, the refrigerant in the air-cooled chiller, what kind of role to play?
1, the refrigerant in the air-cooled cold water machine refrigeration compressor changes
The refrigerant is from the end of the evaporator of the air-cooled chiller into the suction port of the compressor and the refrigerant vapor is compressed into the superheated steam in the refrigeration compressor. The pressure is also increased from the evaporation pressure to the condensing pressure. As the compressor compression process is completed in an instant, so this time the refrigerant vapor and the outside will not heat exchange, we call the adiabatic compression process.
2, the refrigerant in the air-cooled chiller condenser changes
After the superheated steam enters the air-cooled chiller condenser, since the pressure condition does not change, it will emit a part of the heat, so that the refrigerant superheated steam cooled into saturated steam. Because this time is still in the isothermal conditions, so saturated steam will continue to release heat and condensation and continue to produce saturated liquid. The longer the condensation time, the more saturated the liquid will be, saturated steam will be reduced, the end result is: all the refrigerant vapor condensed into saturated liquid.
3, the refrigerant in the air-cooled chiller throttling components in the change
Since all of the refrigerant has become a saturated liquid, when the saturated liquid refrigerant flows through the throttling element of the air-cooled chiller, it is reduced from the condensing pressure to the evaporation pressure, and the temperature is reduced from the condensing temperature to the evaporation temperature. The refrigerant flowing out of the outlet of the throttling element becomes about 80% of the liquid and about 20% of the gas in the two-phase mixed state, in which a small amount of steam is generated due to the expansion of the liquid due to the pressure drop.
4, the refrigerant in the air-cooled chiller evaporator changes
When the refrigerant enters the air-cooled chiller evaporator, the refrigerant is continuously vaporized under constant temperature conditions due to the heat absorbed by the cooling medium and the evaporation, and the liquid is getting less and less steam many. When the refrigerant liquid is fully vaporized into saturated steam, it will return to the air-cooled chiller compressor inlet, re-cycle of the above changes.