Thermodynamics: Unsteady Flow (Charging) Process

[afpskierx]

Please see the attached photo.

I am not sure how to proceed. I do not know M_i 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. :)

 

[emKhairol]

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.

 

[afpskierx]

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).

 

[emKhairol]

can you PM me your e-mail address? I'll send to you slides for your reference. Thanks :)