Fundamentals of Thermodynamics 7th Edition By Sonntag, Borgnakke Chapter 4: 4.29

Question

Fundamentals of Thermodynamics 7th Edition By Sonntag, Borgnakke
Chapter 4: 4.29
http://www.cramster.com/solution/solution/809885

"As the inlet and exit valves are closed, there is no change in the volume of the fluid. So, the process is a constant volume [constant mass] process."

For this assumption to be right, you would have to choose the radiator as the control volume.. how do you know to do this?? My initial thought was to choose the working fluid (saturated water vapor) as the CV; but as the water condenses, the volume or specific volume would decrease correct? Please explain the best way to decide in these type of situations.. thanks.

Explanation / Answer

First of all clear the concept of CV. CV means there will be no change in the volume Let suppose we have a control volume system, it means that neither a substance can enter nor go out of the system. So if we let the both inlet and outlet valve of radiator closed, then this will be CV. HOW?? in radiator, the water circulates, when the water gets boiled, it changes its phase from liquid to vapors, but will remain in the coils can't come outside the coils and then after losing heat the water again comes back into its initial phase while remain in the coils, so we can consider it CV Hope it helps

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