# Heat Engine - Maximum Efficiency

science.girl

## 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 = $$\frac{Qc}{Qh}$$

## 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?

Thaakisfox
Just a little more figuring ;) think of the Carnot cycle ;)

Staff Emeritus
Homework Helper
Check your textbook for another efficiency equation, one involving absolute temperatures rather than Q's.

Homework Helper

## 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 = $$\frac{Qc}{Qh}$$
Efficiency is the ratio of Energy (work) out to Energy (heat flow) in. This is not Qc/Qh

AM