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display cases Single-stage vapor compression refrigeration theoretical cycle
author: supermarket refrigerated showcase category: commercial refrigeration Views: 566Time: 2016-08-22
display cases Single-stage vapor compression refrigeration theoretical cycle
in the pH diagram display cases Single-stage vapor compression refrigeration theoretical cycle working process on the pressure-enthalpy (pH) diagram Indicates shown. Point 1 represents the state of refrigerant entering the compressor, which corresponds to saturated vapor at the evaporation temperature to p. Point 2 represents the state when the refrigerant exits the compressor and is also the state when it enters the condenser. The process line 1-2 represents the isentropic compression process of the refrigerant vapor in the compressor (S1=S2), which is compressed from the evaporation pressure Po to the condensation pressure pk. Point 2 is in a superheated vapor state. Point 3 represents the state of refrigerant exiting the condenser, which is the saturated liquid corresponding to the condensation pressure pk. The process line 2-2' 一3 means that the refrigerant is cooled in the condenser (2一2') and condenses In the process of (2'一3), the pressure in the entire condensation process remains unchanged.
point 4 represents the state of refrigerant exiting the throttle valve, that is, entering the state of the evaporator. The process line 3-4 represents the throttle process when the refrigerant passes through the throttle valve. In this process, the pressure of the refrigerant drops from pk to Po temperature and from tk to to, entering the two-phase zone. Since the enthalpy value of the refrigerant does not change before and after throttling, the intersection of the isenthalpy and the isobar po from point 3 is the state of point 4. Since the throttling process is an irreversible process, the process line 3-4 is often represented by a dashed line. The process line 4-1 represents the vaporization (evaporation) process of the refrigerant in the evaporator. Since this process is carried out under isothermal and equal pressure, the liquid refrigerant absorbs the heat of the object to be cooled and continuously vaporizes. Therefore, the state of the refrigerant changes along the isobar to a thousand degrees increasing direction until it becomes saturated. So far. In this way, the state of the refrigerant returns to the state before entering the compressor, thus completing a theoretical refrigeration cycle.
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