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Applying the Energy BalanceA piston-cylinder
Chapter 3, Problem 81P(choose chapter or problem)
A piston-cylinder assembly contains ammonia, initially at 0.8 bar and \(-10^{\circ} \mathrm{C}\). The ammonia is compressed to a pressure of 5.5 bar. During the process, the pressure and specific volume are related by p v = constant. For \(20 \mathrm{~kg}\) of ammonia, determine the work and heat transfer, each in kJ.
Questions & Answers
QUESTION:
A piston-cylinder assembly contains ammonia, initially at 0.8 bar and \(-10^{\circ} \mathrm{C}\). The ammonia is compressed to a pressure of 5.5 bar. During the process, the pressure and specific volume are related by p v = constant. For \(20 \mathrm{~kg}\) of ammonia, determine the work and heat transfer, each in kJ.
ANSWER:Solution
Step 1
Consider a piston cylinder assembly contains ammonia initially at pressure and temperature is compressed to a pressure .
We need to find out the work and the heat transfer.