Maximizing Efficiency: Uncovering the Truth About Heat Engines

In summary, the conversation discusses the concept of heat engine efficiency and how it relates to the reversible engine. The participants suggest showing it experimentally, algebraically, or logically, with references to the Carnot engine and the second law. The statement from the book is also mentioned, with a request for clarification.
  • #1
cheez
26
0
Show that no heat engine can be more efficient than a reversable engine.

I really don't have any idea. Can someone shows me any direction of doing it?
 
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  • #2
Show it experimentally? good luck! see you in about 10 years ...

Algebraically? starting with WHAT as your given statements?

Logically? Most textbooks show that if some heat engine WAS more efficient
than a reversible one, then the reversible one run backwards hooked up to the "super-efficient" one, would do mechanical Work endlessly.
See "Carnot" in your index ...
 
  • #3
I have read "the carnot engine" and "2nd law" a lot of times, but I still can't figure out how to prove it!


From the book:
"If the more efficient engine is used to drive the Carnot engine as refrigerator, the net result would be transfer of heat from the cold to the hot reservoir."

I don't understand this statement.

please help!
 
  • #4
can anyone explain the statement?
urgent! please help
 

FAQ: Maximizing Efficiency: Uncovering the Truth About Heat Engines

What is a heat engine?

A heat engine is a device that converts thermal energy into mechanical energy, which can then be used to perform work.

How does a heat engine work?

A heat engine works by taking in heat energy from a high temperature source, such as burning fuel, and using it to create motion or mechanical energy. This energy is then converted into useful work, such as powering a car or generating electricity.

What are the different types of heat engines?

There are several types of heat engines, including internal combustion engines (used in cars), steam engines (used in trains), and gas turbines (used in power plants). Each type uses different mechanisms to convert heat into mechanical energy.

How efficient are heat engines?

Heat engines are not 100% efficient, meaning they do not convert all of the input heat energy into mechanical energy. The efficiency of a heat engine depends on various factors such as the type of engine, the fuel being used, and the operating conditions. However, most modern heat engines have efficiency rates between 20-40%.

How can we improve the efficiency of heat engines?

There are several ways to improve the efficiency of heat engines, such as using better insulation to reduce heat loss, increasing the temperature difference between the hot and cold reservoirs, and using more efficient fuels. Ongoing research and advancements in technology are also helping to improve the efficiency of heat engines.

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