Notices
Results 1 to 3 of 3

Thread: The problem of air conditioners heating up Earth

  1. #1 The problem of air conditioners heating up Earth 
    Forum Freshman
    Join Date
    Aug 2005
    Posts
    7
    In India, the number of air conditioners are expected to grow exponentially. 2/3 of electricity in India is produced by coal and gas. So the air conditioners exponentially warm up Earth both from the electricity production and by directly heating the air outside. The air conditioner turns electricity into heat and moves heat from inside to outside. Inside the house there are other heat sources such as computers etc.

    Let's say hypothetically that the electricity production is dealt by moving into nuclear power. Thus carbon dioxide emission is reduced. How about the air conditioner problem heat exhaust problem. How can that be fixed? Is this mathematically possible or impossible (I want to understand thermodynamics better):

    By clever usage of compressors and decompressors, the AC would boil up water. The water vapor would roll a turbine which would store electricity into a battery. This battery would be connected to home electricity. The water vapor would be cooled down and condesed again, yet to be boiled up again. As a result, the AC would emit less heat outside and instead turn that heat into energy, storing it in the battery. The compressor/decompressor part would use electricty (and add heat) but that electricity would be taken from nuclear power.

    Will that be efficient and viable?


    Reply With Quote  
     

  2.  
     

  3. #2  
    Forum Cosmic Wizard
    Join Date
    Aug 2013
    Location
    San Diego
    Posts
    2,144
    Quote Originally Posted by jimhoyle View Post
    Let's say hypothetically that the electricity production is dealt by moving into nuclear power. Thus carbon dioxide emission is reduced. How about the air conditioner problem heat exhaust problem. How can that be fixed?
    1) More efficient air conditioners
    2) Non-AC heat mitigation (albedo changes mainly)
    By clever usage of compressors and decompressors, the AC would boil up water. The water vapor would roll a turbine which would store electricity into a battery. This battery would be connected to home electricity. The water vapor would be cooled down and condesed again, yet to be boiled up again. As a result, the AC would emit less heat outside and instead turn that heat into energy, storing it in the battery.
    That would violate the laws of thermodynamics, so it won't work.


    Reply With Quote  
     

  4. #3  
    Forum Masters Degree
    Join Date
    Jul 2010
    Location
    Australia
    Posts
    735
    Waste heat - total heat generated directly by fuel burning and indirectly from the heat from the end uses - has been estimated at about 1% of anthropogenic warming forcing, ie accumulated heat due to Greenhouse Gases is about 100 times the heat from waste heat.

    This study by Flanner, M. G. (2009) "Integrating anthropogenic heat flux with global climate models" estimated that waste heat accounted for a global average 0.028 Watts per square metre versus 2.9 Watts per m2 for greenhouse warming.

    If the energy is coming from zero emissions sources then more energy use is possible whilst still decreasing the overall contributions to global warming - although if overall energy use grows to 100x current use, entirely from zero emissions sources (and I suppose 10 billion people aspiring to the extravagantly wasteful prosperity of developed industrialised nations will push it in that direction) then we could still have a global warming problem, based on waste heat. Still a lot less of a global warming problem than with global growth based on unrestrained growth of the use of fossil fuels.
    Reply With Quote  
     

Similar Threads

  1. Replies: 3
    Last Post: June 14th, 2017, 10:01 AM
  2. Mars vs Earth air speed,
    By MrScabs in forum Physics
    Replies: 9
    Last Post: January 24th, 2014, 12:00 AM
  3. air pressure release problem
    By megamoo in forum Mechanical, Structural and Chemical Engineering
    Replies: 6
    Last Post: September 16th, 2010, 05:35 AM
  4. Earth from the air
    By marnixR in forum Links
    Replies: 0
    Last Post: July 7th, 2007, 04:20 PM
  5. Replies: 2
    Last Post: May 20th, 2007, 11:19 PM
Tags for this Thread

View Tag Cloud

Bookmarks
Bookmarks
Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •