6 replies to this topic

[rajprocess]

how can we caluculate latent heat for a multi component mixture.....

Is there any soft ware available for getting latent heat for multi component mixture....

 

please explain in detail..

 

Thanking you inadvance ,

rajeev

[PaoloPemi]

you can calculate latent heat as

 

SUM(xi*hvi)

where xi is weight fraction of component i

and hvi is latent heat of component i

 

hvi can be found in tables or calculated for example from a specific correlation (see DIPPR)

or by differentiation of a vapor pressure correlation

 

most simulators calculate latent heat as difference

H(dew point) - H(bubble point)

 

where a EOS or equivalent model calculates departure (for H) from ideal condition,

 

for wide boiling mixtures this method returns average values

different from dQ/dw

(where dw is a small fraction of liquid which vaporizes)

to calculate dQ/dw there are different procedures,

for example you can add a little amount of heat,

solve phase equilibria and calculate dQ/dw

from difference in vapor and liquid enthalpies.

 

You may calculate these values with a simulator,

I use PRODE PROPERTIES but any equivalent

sofware can be useful.

[rajprocess]

thankyou paolo...

i will go with SUM(xi*hvi)

[abbasek23]

is hysys use DIPPR Equations

[Padmakar Katre]

how can we caluculate latent heat for a multi component mixture.....

Is there any soft ware available for getting latent heat for multi component mixture....

 

please explain in detail..

 

Thanking you inadvance ,

rajeev

Any commercial simulator will do this for you at given P,T conditions for defined composition.

[hakeemniyas]

Whether this will be applicable to both latent heat of fusion & evaporation?

[serra]

yes,

if you know the heat of fusion of individual components,

solid models such as those included in Prode Properties

adopt those values (when available).