Highest possible efficiency of an engine

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SUMMARY

The highest theoretical efficiency of an engine is calculated using the formula e=(TH-TC)/TH, where TH represents the highest temperature and TC represents the lowest temperature in the cycle. In the case of a Stirling engine tested at 700 °C (TH) and 100 °C (TC), the initial calculation yields an efficiency of 85.7%. However, the expected efficiency is 61.7%, indicating that additional factors must be considered beyond the ideal calculation.

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  • Understanding of thermodynamic principles
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Homework Statement


The highest theoretical efficiency of an engine is

e=(TH-TC)/TH

where TH is the highest and TC is the lowest temperature during the circuit process. In a test car with a stirling engine the highest temperature during the circuit process is 700 °C and the lowest temperature is 100 °C. Calculate the highest possible efficiency.

Homework Equations


e=(TH-TC)/TH

The Attempt at a Solution


1 – 100/700 = 85,7%

But apparently the answer should be 61,7%. What other factors needs to be included here?
 
Last edited:
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Do you know the SI unit for temperature?
 
Ah yes. Of course. Thank you!
 

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