Regarding efficiency of heat engines

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Homework Help Overview

The discussion revolves around the calculation of the efficiency of heat engines, specifically focusing on the Carnot engine. Participants are exploring different formulas for efficiency and the discrepancies that arise between them.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants attempt to calculate efficiency using two different formulas: one based on net work done and heat absorbed, and the other based on temperature ratios. They question why the results from these methods differ.

Discussion Status

The discussion is ongoing, with participants expressing confusion over the differing results from the two methods of calculating efficiency. There is a call for more complete information to facilitate better assistance.

Contextual Notes

There is a noted lack of complete problem statements and calculations from participants, which may hinder the discussion and resolution of the discrepancies in efficiency calculations.

Nitin Gupta
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I tried to calculate the efficiency of a engine using the formula :
Efficiency = (Net Work Done) / (Heat absorbed)

And then I tried to calculate the efficiency of respective Carnot engine by two ways :
1) Efficiency = (Net Work Done) / (Heat absorbed)
2) Efficiency = 1 - (Temperature Lowest / Temperature Highest)

But the efficiency I am getting by the two methods different.How is this possible?
 
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Nitin Gupta said:
I tried to calculate the efficiency of a engine using the formula :
Efficiency = (Net Work Done) / (Heat absorbed)

And then I tried to calculate the efficiency of respective Carnot engine by two ways :
1) Efficiency = (Net Work Done) / (Heat absorbed)
2) Efficiency = 1 - (Temperature Lowest / Temperature Highest)

But the efficiency I am getting by the two methods different.How is this possible?

Beats me.

This is exactly why the PF Rules state that the Homework Template should be filled out completely, so that HW helpers don't have to extract information piece by piece from users.

Please use the HW template and post the complete problem statement you are working on along with your work which has led to an irreconcilable result.
 
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SteamKing said:
Beats me.

This is exactly why the PF Rules state that the Homework Template should be filled out completely, so that HW helpers don't have to extract information piece by piece from users.

Please use the HW template and post the complete problem statement you are working on along with your work which has led to an irreconcilable result.

Sorry for the extremely late reply...check this out...here is what I attempted...
 
Sorry, it looks like your work didn't make it into your post. :frown:
 

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