Unsteady thermodynamic simulation of MVR system

In this study, a thermodynamic model of a mechanical vapor recompression system was established, and the no phase change transient heat transfer model of heat exchanger was simplified. Further unsteady running progress using sensible heat of heated feed liquid as starting heat source was simulated by using iterative method based on steady state calculation data. The results showed that the vapor flow rate would grow rapidly at the beginning, forming an apparent inflection point when the heat exchange reaches the maximum state. Thereafter the flow rate would gradually decrease to the steady state after slowly increasing to the maximum value. Eventually, this progress would last for about 2 500 seconds. Both the maximal compressor power and the maximal compressor intake flowrate would achieve during the unsteady running progress, which are 41.89% and 32.56% higher than the steady state value, respectively.