Heat Engine - Maximum Efficiency

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Homework Help Overview

The discussion revolves around a heat engine operating between two thermal reservoirs at different temperatures, specifically 25 degrees Celsius and 375 degrees Celsius. Participants are exploring the concept of maximum efficiency for this engine.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants discuss the equation for efficiency and whether it requires specific units. There is mention of the Carnot cycle as a relevant concept and suggestions to check textbooks for alternative efficiency equations involving absolute temperatures.

Discussion Status

The discussion is ongoing, with participants providing hints and references to relevant concepts without reaching a consensus. Some guidance has been offered regarding the Carnot cycle and the need for absolute temperature considerations.

Contextual Notes

There is a noted confusion regarding the appropriate equation for efficiency, with some participants questioning the use of energy ratios versus heat flow terms.

science.girl
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Homework Statement


A heat engine operates between a reservoir at 25 degrees Celsius and one at 375 degrees Celsius. What is the maximum efficiency possible for this engine?


Homework Equations



e = \frac{Q<sub>c</sub>}{Q<sub>h</sub>}


The Attempt at a Solution



I'm afraid that the equation above requires units in Joules to calculate thermal efficiency. Is there an equation adapted for this situation? Or does this require more figuring?
 
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Just a little more figuring ;) think of the Carnot cycle ;)
 
Check your textbook for another efficiency equation, one involving absolute temperatures rather than Q's.
 
science.girl said:

Homework Statement


A heat engine operates between a reservoir at 25 degrees Celsius and one at 375 degrees Celsius. What is the maximum efficiency possible for this engine?

Homework Equations



e = \frac{Q<sub>c</sub>}{Q<sub>h</sub>}
Efficiency is the ratio of Energy (work) out to Energy (heat flow) in. This is not Qc/Qh

AM
 

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