How to assign thermodynamic properties after splitting two phase into gas and liquid

[mad fridgie]

Firstly read the first question, there is no mention of an evaporator.

So without thinking any further than what I say next

We have an open flash economiser vessel, liquid in, liquid out vapour out. what are the properties of all. Are there any strange things happening???

[chillerman2006]

We have an open flash economiser vessel, liquid in, liquid out vapour out. what are the properties of all. Are there any strange things happening???

There is no stage of saturation

[mad fridgie]

There is no stage of saturation

????????????????????

[chillerman2006]

????????????????????

There is stage of saturation, the point of entropy, where diss order becomes order once more , the point at which you achieve full seperation ??

[chillerman2006]

The liquid entering the flash econimiser has a specific heat/energy & at the point of seperation you are transfering the heat/energy from the liquid into the vapour, in effect subcooling the liquid

[mad fridgie]

The liquid entering the flash econimiser has a specific heat/energy & at the point of seperation you are transfering the heat/energy from the liquid into the vapour, in effect subcooling the liquid

Not quite, apart from liquid head there is no sub cooling, and you are converting some liquid into vapour to keep the energy balanced. What then are actual properties of each exit stream. This is the question in hand?

[chillerman2006]

There is no stage of saturation

No there must be (surely) a point of saturation, just this is somehow minimal as you have found a way for full seperation

[mad fridgie]

No there must be (surely) a point of saturation, just this is somehow minimal as you have found a way for full seperation

Yes seperation is an issue, but not the issue in hand (it must happen in an open flash vessel anyway) We are onlt talking about internal energy, (law of conservation)

[chillerman2006]

We have an open flash economiser vessel, liquid in, liquid out vapour out. what are the properties of all. Are there any strange things happening???

Liquid in - saturated liquid

liquid out - liquid only

vapour out - vapour only

neither are superheated or subcooled

& therefore

to go back to the question from Chef - #5

They would both be plotted on a ph chart along their respective lines at the point of saturation

???????????

[mad fridgie]

Liquid in - saturated liquid

liquid out - liquid only

vapour out - vapour only

neither are superheated or subcooled

& therefore

to go back to the question from Chef - #5

They would both be plotted on a ph chart along their respective lines at the point of saturation

???????????

Yes one would think so?????, unless someone can show something else??? and this is all chef was asking