The cooling COP is decided by cooling capacity and the
compressor power consumption (the power consumption of
the fans is constant and neglected). According to the previous
research, the cooling capacity and power consumption will
increase with the increase of the injection pressure until the
OIPCC. After that, the cooling capacity will decrease while the
power consumption continues increasing. Actually, when
the injection pressure is higher than the OIPCC, the injection
specific enthalpy will decrease with the increase of the
injection pressure. In theory, the power consumption of the
compressor may be decreased due to the cooling effect of
refrigerant in the compression pocket. However, experiments
(Ayub et al., 1992; Dutta et al., 2001) show that liquid injection
cannot decrease the power consumption of the compressor
and the power consumption will keep increasing when the
injection pressure is higher than the OIPCC. Therefore, the
maximum cooling COP will be reached when the injection
pressure is less than or equal to the OIPCC. The actual injection
pressure is related to the actual performance of the system
and the compressor. However, further experimental research
shows that the maximum cooling COP often appears at the
close region of OIPCC and sometimes even equals OIPCC.
The cooling COP is decided by cooling capacity and thecompressor power consumption (the power consumption ofthe fans is constant and neglected). According to the previousresearch, the cooling capacity and power consumption willincrease with the increase of the injection pressure until theOIPCC. After that, the cooling capacity will decrease while thepower consumption continues increasing. Actually, whenthe injection pressure is higher than the OIPCC, the injectionspecific enthalpy will decrease with the increase of theinjection pressure. In theory, the power consumption of thecompressor may be decreased due to the cooling effect ofrefrigerant in the compression pocket. However, experiments(Ayub et al., 1992; Dutta et al., 2001) show that liquid injectioncannot decrease the power consumption of the compressorand the power consumption will keep increasing when theinjection pressure is higher than the OIPCC. Therefore, themaximum cooling COP will be reached when the injectionpressure is less than or equal to the OIPCC. The actual injectionpressure is related to the actual performance of the systemand the compressor. However, further experimental researchshows that the maximum cooling COP often appears at theclose region of OIPCC and sometimes even equals OIPCC.
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