This paper investigates the problem of
control design for an Organic Rankine Cycle (ORC)
for Waste Heat Recovering (WHR). Based on a mov-
ing boundary heat exchanger model derived from
energy and mass conservation principles, an implicit
model, control-oriented and experimentally validated,
is presented. Then, a first controller which consists on
a gain-scheduled PID combined to a dynamic feedfor-
ward is implemented on the pump speed to maintain
the superheat close to the set point value. A second
controller is a nonlinear feedback law which allows
to adjust the evaporating pressure to time-varying
demand with a good accuracy. To implement these
two controllers, an observer is designed to achieve
the state estimation from pressure measurement, typ-
ically available in WHR applications.
The observer and the control approach are validated
on realistic operating conditions.