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  1. #1
    Join Date
    Aug 2012
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    6

    Without a compressor will coil cool slightly?

    I was wondering in theory if there was no compressor in an ac system when it is hotter by the condesor coil would the evap coil cool the room at all since heat will still transfer through the pipes.

  2. #2
    Join Date
    Oct 2011
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    Chicagoland Area
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    Heat wont transfer if there is no temperature difference. The refrigerant will take on the temperature of the ambient. If the temp in the house is 80* the refrigerant will be 80*
    Officially, Down for the count

    YOU HAVE TO GET OFF YOUR ASS TO GET ON YOUR FEET

    I know enough to know, I don't know enough
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  3. #3
    Join Date
    Dec 2011
    Location
    New Zealand
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    2,268
    If the system could thremo-syphon it would heat the room.
    Energy travels from more to less.

  4. #4
    Join Date
    Nov 2012
    Location
    NYC
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    19
    Gh

  5. #5
    Join Date
    Aug 2012
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    6
    I made a mistake. If it is colder outside than inside and there is no compressor would the heat transfer through the pipes outside.

    in another scenario if the outside coil was 100 times the size of the inside coil would the inside space be cooled even if it was hotter outside.

  6. #6
    Join Date
    Dec 2011
    Location
    New Zealand
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    Quote Originally Posted by ari View Post
    I made a mistake. If it is colder outside than inside and there is no compressor would the heat transfer through the pipes outside.

    in another scenario if the outside coil was 100 times the size of the inside coil would the inside space be cooled even if it was hotter outside.
    Question one, yes is possible and can be designed to achieve this, Star Refrigeration, Scotland, designed a valve and system to achieve this in the industrial refrigeration field. You could also look up heat pipes, (like you see in some solar systems) as also used in air cooling. Quite common in remote telecommunication transmission stations

    Question 2

    No

  7. #7
    Join Date
    Dec 2005
    Location
    Cincinnati, Oh
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    5,184
    Quote Originally Posted by ari View Post
    I made a mistake. If it is colder outside than inside and there is no compressor would the heat transfer through the pipes outside.

    in another scenario if the outside coil was 100 times the size of the inside coil would the inside space be cooled even if it was hotter outside.
    the ammount of transfer would be so small, it would take us days to figure out just how small.
    "Better tell the sandman to stay away, because we're gonna be workin on this one all night."

    "Dude, you need more than 2 wires to a condenser to run a 2 stage heatpump."

    "Just get it done son."

    Dad adjusted

  8. #8
    Join Date
    Jun 2001
    Location
    Moore, Oklahoma, United States
    Posts
    4,441
    You would need to have some type of circulator to move the fluid. I suppose it could work w/o an expansion device and a small circulator in place of the compressor. Don't know why anybody would want to do this though...

  9. #9
    Join Date
    Nov 2007
    Location
    Mississippi
    Posts
    1,394
    If its colder outside than inside, why not just open a window? Or an economizer?

  10. #10
    Join Date
    Dec 2005
    Location
    Cincinnati, Oh
    Posts
    5,184
    I think he feels his unit is still cooling, even though the compressors shot.

    Most likely because the fan is running, and making him FEEL cooler.
    "Better tell the sandman to stay away, because we're gonna be workin on this one all night."

    "Dude, you need more than 2 wires to a condenser to run a 2 stage heatpump."

    "Just get it done son."

    Dad adjusted

  11. #11
    Join Date
    Jan 2005
    Location
    steeler nation
    Posts
    2,107
    you dont need a compressor. just something to raise the refrigerant pressure before the condensor.
    IV IV IX

    use your head for something other than a hat rack.......Gerry

  12. #12
    Join Date
    Sep 2008
    Location
    Western PA
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    It isn't really possible to break the laws of thermodynamics.

    The one in play here is that heat moves from an area of high content to an area of low content.

    So, if it is warm outside and cool inside, the direction of natural heat flow is from outside to inside. A compressor is required to operate the refrigerating machine that moves the heat opposite normal flow.

    A heat pipe or thermosyphon, as mentioned earlier can be setup to move heat, but isn't exactly practical, IMO, nor is it likely to happen naturally in a beneficial manner for you.

  13. #13
    Join Date
    Jun 2001
    Location
    Moore, Oklahoma, United States
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    4,441
    Quote Originally Posted by hvacvegas View Post
    I think he feels his unit is still cooling, even though the compressors shot.

    Most likely because the fan is running, and making him FEEL cooler.
    Or it cold be cold where he lives and it's pulling cold air through leaks in ductwork from unconditioned space.

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