flow rate to the shell side is treated as the
manipulated variable. The flow rate of the hot water
is treated as disturbance variable. The hot water inlet
temperature is maintained constant with a + 0.5oC
variation using an inbuilt digital PID controller. The
cold water is supplied at the room temperature. The
inlet flow of the cold water can be varied in the range
of 0-350 LPH and that of hot water between 0-250
LPH. All the sensor and actuators are interfaced with
a 16 bit data acquisition system (Advantech ADAM
5000 series hardware). The module consists of 8
analog inputs and 4 analog output channels.
Communication standard used is RS232. The
specifications of the heat-exchanger are tabulated in
Table 1.