Patent ID: 7200996

Claim:
A closed loop control system for an ORC, said ORC comprising a pump, said control system comprising: a comparator that compares a superheat setpoint input and a calculated superheat value input, and provides a superheat error signal; a superheat controller responsive to said superheat error signal, said superheat controller providing a superheat control signal; an adder that adds said superheat control signal and a pressure signal, and provides a summed signal; a range limiter that accepts as input said summed signal, and produces a range limited signal within a limit range; a subtractor that subtracts from said range limited signal a duplicate of said pressure signal, said subtractor providing as output a subtracted signal; and a pressure controller that accepts said subtracted signal and produces in response thereto a pressure control signal; whereby said closed loop control system controls a superheat of said ORC when said range limited signal is below a maximum value of said limit range, and said closed loop control system controls a pressure of said ORC when said range limited signal is at a maximum value of said range limit.