Thermodynamics: Unsteady Flow (Charging) Process

AI Thread Summary
The discussion revolves around determining thermodynamic properties during an unsteady flow process, specifically the charging of a system. Participants express uncertainty about calculating parameters like Mi and M2, and the temperature at point two when the valve is closed. One user suggests interpolating to find u_2, arriving at a value of 3047.35 kJ/kg, while another clarifies the mass of vapor in a saturated mixture. The conversation highlights the assumption that at state 2, the system is in a superheated vapor state due to the high temperature compared to the saturated temperature. Overall, the thread emphasizes collaboration and sharing resources to solve the thermodynamic problem.
afpskierx
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Please see the attached photo.

I am not sure how to proceed. I do not know Mi or M2, nor do I have enough information to determine the temperature at point two (when the valve is closed). Any help getting me going along will be much appreciated. :)
 

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Hi afpskierx,

Have you find the u_2 by doing interpolation? I got the answer for u_2 = 3047.35 kJ/kg

At state 1, I don't quite understand with the question which stated that that mass of saturated mixture of water is 12kg.

So, I assume the quality, x = mass of vapour / total mass. You will get 7.2kg for your mass of vapour.

At state 2 (which is the P_2 = 400kPa and T_2 = 450 C) I assume it SUPERHEATED VAPOUR seems the T_2 larger than saturated temperature.

I just can help for what I wrote above. Otherwise, I'll try come out for the full solution later.
 
What did you use to look up u2? The only thing we know about it is that its quality is one (it is a saturated vapor).
 
can you PM me your e-mail address? I'll send to you slides for your reference. Thanks :)
 

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