1 reply to this topic

[Teck Guan Wan]

How do I about to go doing heat integration that requires phase change?
It is a reboiler stream and two other streams.
How do we get CP values for reboiler? cos it doesnt exist, since it only has latent heat.

[pavanayi]

Teck,
In a reboiler, a stream takes up heat to form vapour phase. So it is a cold stream.
On your T-H composite curve, it will be a flat line parallel to enthalpy axis. (No temperature change, but only enthalpy change).

For calculation purposes, you are concerned with m.cp (mass heat capacity) values. What you should do when specifying the stream is to assume the temperature of vapour stream leaving the reboiler as 0.1°C greater than the inlet stream that goes into the reboiler.

Have you now understood how to go about your problem?