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Air in a piston/cylinder is at 1800 K, 7 MPa and expands
Chapter 3, Problem 152HP(choose chapter or problem)
Problem 152HP
Air in a piston/cylinder is at 1800 K, 7 MPa and expands in a polytropic process with n = 1.5 to a volume eight times larger. Find the specific work and specific heat transfer in the process and draw the P–v diagram. Use constant specific heats to solve the problem.
Questions & Answers
QUESTION:
Problem 152HP
Air in a piston/cylinder is at 1800 K, 7 MPa and expands in a polytropic process with n = 1.5 to a volume eight times larger. Find the specific work and specific heat transfer in the process and draw the P–v diagram. Use constant specific heats to solve the problem.
ANSWER:
Solution 152 HP
Step 1 of 4
We have to find the specific work and specific heat transfer in the process using specific heat and also draw the diagram.
The specific work done in a polytropic process with ( with )can be found using the expression.
Where,
gas constant for air
= 0.287 kJ/kgK
= 1.5
K
final temperature in K