As the aforementioned, there are two well-known configurations
of the gas refrigerant injection system, the IHX system
and the flash tank system. From the viewpoint of thermodynamics,
the flash tank has better heat exchange between the
main loop refrigerant and injection loop refrigerant. Some
experiments also proved that the flash tank configuration has
better performance than the one with an IHX (Ma and Zhao,
2008). However, it is a pity that the gas injected into the
compressor is saturated vapor. Its temperature is far lower
than the outlet refrigerant temperature of the condenser, and
the cooling ability of the refrigerant in the injection loop is not
fully used. In theory, a hybrid economizer combined flash
tank and IHX (Fig. 9) will decrease the optimal injection
pressure and increase the performance of the injection
system. Preliminary numerical experiments show it could
increase the cooling capacity of the system 1.5%w3.5%.
As the aforementioned, there are two well-known configurations
of the gas refrigerant injection system, the IHX system
and the flash tank system. From the viewpoint of thermodynamics,
the flash tank has better heat exchange between the
main loop refrigerant and injection loop refrigerant. Some
experiments also proved that the flash tank configuration has
better performance than the one with an IHX (Ma and Zhao,
2008). However, it is a pity that the gas injected into the
compressor is saturated vapor. Its temperature is far lower
than the outlet refrigerant temperature of the condenser, and
the cooling ability of the refrigerant in the injection loop is not
fully used. In theory, a hybrid economizer combined flash
tank and IHX (Fig. 9) will decrease the optimal injection
pressure and increase the performance of the injection
system. Preliminary numerical experiments show it could
increase the cooling capacity of the system 1.5%w3.5%.
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