Solution Found!
Do the previous problem but do not use constant specific
Chapter 3, Problem 153HP(choose chapter or problem)
Problem 153HP
Do the previous problem but do not use constant specific heat.
Reference Problem:
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 drawthe
P–v diagram. Use constant specific heats to solve
the problem.
Questions & Answers
QUESTION:
Problem 153HP
Do the previous problem but do not use constant specific heat.
Reference Problem:
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 drawthe
P–v diagram. Use constant specific heats to solve
the problem.
ANSWER:
Step 1 of 4
We have to find the specific work and specific heat transfer in the process and also draw the diagram.
The specific work done in a polytropic process with ()can be found using the expression.
Where,
gas constant for air
= 0.287 kJ/kgK
= 1.5
K
final temperature in K