By

S.Kaviyarasan

The system is designed to be controlling the O/P water temperature of a missing value fed by two reservoir

output temperature is measured by thermistor voltage of Thermistor is utilized as analog input to data acquaintance cards.

Value controlled by 0 to 5 volt – O/P.

PID control system with feedbackcontroller for shell and tube heat exchanger.

Principle:

The systems temperature is maintained by manipulating the flow of hot water in the stream of cold water.

Control valve capacity 1.6kg/sec Exchanger response to vapor 50’C/(kg/sec)Control valve time constant 3sec Process time constant 30 secsensor temperature50-150Drive current range 4-0 mA

Sensor time constant 10 sec Drive pressure range 3-15psig