In order to verify the calculation result of the fitting formula of water vapor as the actual gas, the compression work and the axial work of the isentropic compression process were also calculated by using the enthalpy-entropy map of water vapor. According to the energy equation of steady-state flow, the axial work wa of the isentropic compression process can be calculated by the following formula: The compression work w of the isentropic compression process can be calculated by the following equation: since the evaporating temperature T and the condensing temperature T of the refrigerator are known Therefore, h and v in the above two formulas can be directly obtained from the enthalpy-entropy map of water vapor. When the other conditions are the same, the water vapor is taken as the actual gas, and the power consumption calculation results of the isentropic compression process are compared at the evaporation temperatures of 7 and 10 by the formula fitting and the enthalpy-entropy map, respectively.
The saturated multi-variable compression process calculates the saturated multi-variable compression process (SPCP) of water vapor. The process refers to the heat generated by the steam in the compression process is taken away by the cooling fluid. As the pressure increases, the water vapor The temperature is always equal to the saturated steam temperature corresponding to the varying pressure, ie the high pressure steam exhaust temperature of the compressor is equal to the saturated steam temperature corresponding to the exhaust pressure. Therefore, the multivariate index of the multivariate process can be calculated by the following formula: If water vapor is used as the ideal gas, then the compression work w and the axial work w of the saturated multi-variable compression process can be calculated as follows: The water vapor is taken as the actual gas, and the compression work wc and the shaft work wa can still be calculated from the enthalpy-entropy map of the water vapor.
However, in order to conveniently use the computer for calculation, for the saturated multi-variable compression process, a corresponding functional relationship between the water vapor saturation pressure and the saturation temperature is obtained by the data fitting method, as shown in the following two equations: The compression work w and the shaft work w required for the multi-variable compression process can be calculated as follows: for the saturated multi-variable compression process, the water vapor is treated as the ideal gas and the actual gas, and the compressor power consumption and the refrigerator performance are compared. result.
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