Calculation of Compressor Performance for Different Compression Processes In order to determine the performance of a water vapor compression chiller and compare it with a Freon-type chiller, the following assumptions are made: 1) only the compressor consumes electric power in the chiller; 2) both the evaporator and the condenser It is an ideal heat exchanger and the expansion device has no loss; 3) The water vapor compressor can be cooled as required. On this basis, the water vapor is regarded as the ideal gas and the actual gas respectively, and the compressor power consumption of the three compression processes using the isentropic compression process, the saturated multi-variable compression process and the ordinary multi-variable compression process is calculated.
In the calculation of the coefficient of performance (COP) of the refrigerator, the mass flow rate of water vapor in the refrigerator is selected to be 0.5 kgs, so its cooling energy. Compression process If the compression process proceeds very quickly and there is no loss inside, and there is no heat exchange with the outside world, this compression process can be regarded as an isentropic compression process. Assuming that the water vapor is an ideal gas, the compression work w and the shaft work w required to compress the water vapor from the saturation pressure P at the initial evaporation temperature to the saturation pressure P at the condensation temperature can be calculated as follows: where k is equal The entropy compresses the adiabatic index, and the value of P(Pa) can be calculated from the evaporation temperature T(K) and the condensation temperature T by the following formula until C is constant.
If the water vapor is regarded as the actual gas, and the inlet pressure Pe and the outlet pressure Pc of the compressor are known, the compression work wc and the shaft work wa required for the isentropic compression process can be calculated as follows: the data of the steam is calculated by the formula By fitting, the obtained fitting formula is as follows: The coefficient of performance (COP) of the water vapor compression refrigerator can be calculated by the following formula: for the isentropic compression process, the water vapor is regarded as the compressor work of the ideal gas and the actual gas, respectively. Comparison of the performance of the refrigerator and the performance of the refrigerator.
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