How to calculate heat flow in a Heat Exchanger when condensing? 1

[7wgh]

Hi Everyone,

I have a question regarding calculating heat flow in a heat exchanger when condensing is happens. I'm aware that the equation is Q = mHvap, however, my question is, how do I calculate Hvap?

Example:

Shell (Produced Gas) and Tube (Boiler Feed Water) where the BFW is being heated by the PG. The PG begins to condense.

I have all the process parameters i.e. inlet/outlet temperature & pressures. As well as the flow of PG.

The only unko=nown is the Hvap of PG, how do I obtain this value?

I appreciate any comments or thoughts.

Thanks,

Wil

 

[SeanB]

Simulate the gas in Hysys.

 

[PaoloPemi]

if the gas is a pure fluid then it should be simple to calculate latent heat, you may find data in several books, in NIST site etc.
If it's a multicomponent mixture then things are more difficult, a procedure can utilize a EOS to calculate enthalpy departures from ideal gas, then latent heat is calculated as
Enthalpy Vapor - Enthalpy Liquid
You may find several tools in the net, I use Refprop (NIST.gov) and Properties (Prode.com) for both of these free versions are available.