MODEL HEAT EXCHANGER AUTOMATION

摘要

Heat exchange is a complex process, which is having capacity and a time lag as process elements. The proposed system is a typical pipe-in pipe-type2 heat exchanger. The complexity of the system demands careful selection, proper installation and commissioning. The two accepted control strategies often used are feedback approach and other a feedforword approach. The temperature, flow, and pressure sensors play a vital role in the control performance. The final control element used is a pneumatically operated control valve. The results obtained are encouraging and revealing the fact that if the process details are known completely as far as process parameters are concerned and utilities are well stabilized then the feed forward strategy can be effectively employed and in all other situations feedback will be the only choice. After careful selection of sensors installation demands precise workmanship. The proposed set up has been implemented as an Educational Aid to give better insight in functioning of the heat exchanger and the manipulating control strategies.