Fire case for HC water mixtures
Fire case for HC water mixtures
(OP)
I am calculating relief cases for a system with a water HC mixture. My question is does anyone have a good idée how to calculate the heat of vaporisation for the mixture?
If I take the enthalpy of the mixture in vapour phase (at due point) minus enthalpy of the mixture in liquid phase (at bubble point) I will get some kind of average of the required heat input to evaporate the mixture (and rise the temperature). But the actual heat of vaporisation can change a lot from start to the end.
If I take the enthalpy of the mixture in vapour phase (at due point) minus enthalpy of the mixture in liquid phase (at bubble point) I will get some kind of average of the required heat input to evaporate the mixture (and rise the temperature). But the actual heat of vaporisation can change a lot from start to the end.





RE: Fire case for HC water mixtures
one can get any and all answers based on the physical property set used.
I once tried many different combination using PROII simulator. Never obtained consistency.
Be very skeptical of anyone who claims there is a right method.
My current strategy is to calculate two cases.
One case 100% hydrocarbon.
One case 100% water.
Make sure the safety valve will handle both cases.
RE: Fire case for HC water mixtures