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A pistoncylinder assembly contains ammonia, initially at a
Chapter 3, Problem 3.67(choose chapter or problem)
A piston–cylinder assembly contains ammonia, initially at a temperature of \(-20^{\circ} \mathrm{C}\) and a quality of 50%. The ammonia is slowly heated to a final state where the pressure is 6 bar and the temperature is \(180^{\circ} \mathrm{C}\). While the ammonia is heated, its pressure varies linearly with specific volume. Show the process of the ammonia on a sketch of the p–v diagram. For the ammonia, determine the work and heat transfer, each in kJ/kg.
Questions & Answers
QUESTION:
A piston–cylinder assembly contains ammonia, initially at a temperature of \(-20^{\circ} \mathrm{C}\) and a quality of 50%. The ammonia is slowly heated to a final state where the pressure is 6 bar and the temperature is \(180^{\circ} \mathrm{C}\). While the ammonia is heated, its pressure varies linearly with specific volume. Show the process of the ammonia on a sketch of the p–v diagram. For the ammonia, determine the work and heat transfer, each in kJ/kg.
ANSWER:Step 1 of 4
Given data:
The initial temperature of the ammonia is \({T_1} = - 20\;{\rm{^\circ C}}\).
The final pressure of the ammonia is \({p_2} = 6\;{\rm{bar}} = 600\;{\rm{kPa}}\).
The final temperature of the ammonia is \({T_2} = 180\;{\rm{^\circ C}}\).
The p-v diagram for the process is given below,
