Kitty's Guide to Heat Engines, Refrigerators, & Air Conditioners

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Discussion Overview

The discussion revolves around the functioning of heat engines, refrigerators, and air conditioners, focusing on the processes involved and the thermodynamic cycles they operate within. Participants explore concepts such as adiabatic expansion and heat exchange, while seeking clarification on the nature of these processes.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant expresses confusion about the workings of heat engines, refrigerators, and air conditioners, specifically questioning whether their processes are isothermic, isovolumetric, or adiabatic.
  • Another participant explains that the refrigeration cycle relies on a working fluid that cools down during adiabatic expansion and describes the sequence of operations involving heat exchangers and compression.
  • A participant confirms the cyclical nature of the refrigeration process, outlining the steps of expansion, heat exchange, compression, and subsequent cooling.

Areas of Agreement / Disagreement

The discussion does not present a consensus, as participants are still exploring the concepts and processes involved without resolving the initial confusion expressed.

Contextual Notes

Participants have not fully addressed the specific thermodynamic classifications (isothermic, isovolumetric, adiabatic) related to the processes of heat engines and refrigerators, leaving these aspects unresolved.

misskitty
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Could someone explain to me how heat engines and refrigerators and air conditioners work. I'm very confused about the process and if they are isothermic, isovolumetric, or adiabatic.

~Kitty
 
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The key to a refrigeration cycle is a working fluid with just the right properties that it cools down to a useful temperature when undergoing adiabatic expansion. Then, after going through a heat exchanger in gaseous form (dispensing its "coldness" to whatever use you have for it), warming it up, it is compressed into a much hotter liquid, and run through another heat exchanger, cooling that liquid down.

http://home.howstuffworks.com/refrigerator4.htm
 
This just keeps doing that over and over right?

~Kitty
 
Yep: Expand (and cool)-> Pass through heat exchanger (and warm) -> compress (and warm more) -> Pass through second heat exchanger (and cool) -> Repeat.
 

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