Where yR32 represents the parameters of R32, and yR410A represents the parameters of R410A. The parameters include capacity, COP, system power consumption and refrigerant mass flow rate.
To evaluate the performance comparison between with and without vapor injection, the performance without vapor injection was used as the baseline. The performance variation is defined in Equation (8):
Where zvi represents the parameters of the cycle performance with vapor injection, and z represents the parameters of the cycle without vapor injection. The parameters include capacity, COP and system power consumption.