• Support PF! Buy your school textbooks, materials and every day products Here!

Carnot engine problem

  • Thread starter shar_p
  • Start date
  • #1
14
0

Homework Statement


The exhaust temperature of a Carnot heat engine is 401◦ C.
What is the intake temperature if the efficiency of the engine is 40.2 %?
Answer in units of ◦ C.


Homework Equations



e = 1 - Tc/Th (all in Kelvin)


The Attempt at a Solution


0.402 = 1 - Tc/ (401+273) = 1 - Tc/674
Tc = 0.598 * 674 = 403.052
Tc in C = 403.052-273 = 130.052

But somehow this answer seems to be wrong on the quest. This is my last problem ..please help? What am I doing wrong? Am I missing something?
 

Answers and Replies

  • #2
rock.freak667
Homework Helper
6,230
31
You were given Tc to get Th, not the other way around like you did.
 
  • #3
14
0
Thanks .. that worked.
 

Related Threads for: Carnot engine problem

  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
3
Views
2K
  • Last Post
Replies
2
Views
5K
  • Last Post
Replies
7
Views
5K
  • Last Post
Replies
3
Views
3K
  • Last Post
Replies
3
Views
3K
Replies
2
Views
17K
Top