In the video below we show what vapor recompression (or heat pump) is. We also show how to simulate this process using the iiSE simulator. See that we do not need any ‘design-spec’ or ‘recicle’ block. This is one of the advantages of equation oriented simulators!
There are essentially two process simulator technologies: modular (sequential) and equation-oriented (simultaneous). In this video (in Portuguese) some of the advantages of the equation-oriented approach are shown for the iiSE simulator.