Heat energy removed

  • Thread starter bwd111
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  • #1
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Main Question or Discussion Point

What is the heat energy removed from a liquid when vapor is no longer present. This has been bugging me all day. I was thinking latent heat of sublimation cause ice seems to just melt in a ice machine due to door opening and closing and heat from air . Next guess was latent heat of fusion
 

Answers and Replies

  • #2
mathman
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You need to better describe the scenario you are thinking about. In general if something is warmer than its surroundings it will lose heat.
 
  • #3
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True so It would be subcooling . Sublimation is the process of ice becoming water vapor without first going through a liquid stage.

Subcooling is reducing the temperature of a liquid below its boiling point. If you have water sitting in a pan on the stove in your house, it is subcooled liquid water. It is below 212°F.
Subcooling...latent heat of fusion relates to melting/freezing point, condensing/boiling relate to latent heat of vaporization and sublimation is a direct change of state from solid to vapor.
 
  • #4
256bits
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What is the heat energy removed from a liquid when vapor is no longer present.
As mathman has asked, what condition do you have where there is no vapour present and only liquid.
For example, water in a pipe has no vapor present, and heat would be exchanged through the pipe walls via conduction, and perhaps convection, to the surroundings.
 
  • #5
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As mathman has asked, what condition do you have where there is no vapour present and only liquid.
For example, water in a pipe has no vapor present, and heat would be exchanged through the pipe walls via conduction, and perhaps convection, to the surroundings.
In an ac system condenser
 

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