DWSIM: using adjust/controller block for optimization

Using the adjust block to iteratively solve a power cycle, in this example an ideal Rankine cycle with a single open feedwater heater. Note that there are 2 recycle blocks in this example. This works, but the math is unstable. You should put only 1 recycle block, somewhere near the high pressure pump, boiler, or high pressure turbine! How to use the adjust block does not change.