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Thread: Air Conditioning

  1. #1 Air Conditioning 
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    Can somebody explain- In layman terms how air conditioning systems work?
    A special emphasis on where the air is drawn from.

    Thank you.


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  3. #2  
    Moderator Moderator Janus's Avatar
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    It depends on the air conditioner. Some, like the room air conditioners you put in a window just recirculate the room in the Air, they draw in room air, cool it and then blow it back into the room.
    A car air conditioner (and some window models) allow you to choose whether it recycles air or brings in outside air.

    Huge HVAC( Heating, Ventilation, and Air Conditioning) systems which you will find in large buildings can use outside air, recycled air, or a mixture of both. Sensors decide which is best depending on conditions. Louvered vents open and close to control this.

    The basic operation for an air conditioner works like this: Refrigerant is run through a compressor which condenses it, this also raises its temp. Condensed refrigerant is passed though a coil exposed to outside air. The outside air carries away some the heat (this is usually aided by a fan.) the cooled refrigerant is then passed to another coil which is on the room air side of the system and where it is allowed to expand again, cooling even further. Room air is drawn in, passed by the coil by a fan, and being warmer than the coil, gives up some of its heat to the refrigerant, cools in the process, and this cool air is returned to the room. The refrigerant is returned to the condenser to repeat the process. The trick is that the condensing and expansion of the refrigerant allows the outside coils be warmer than the outside air, and the inside coils to be cooler than the inside air, which allows the system to move interior building heat to outside of the building.


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  4. #3  
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    It stands to reason that air conditioning systems need air to work in the first place?
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  5. #4  
    Bullshit Intolerant PhDemon's Avatar
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    ^

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  6. #5  
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    Quote Originally Posted by PhDemon View Post
    ^

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    No comment.
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  7. #6  
    exchemist
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    Quote Originally Posted by Aeronaut View Post
    It stands to reason that air conditioning systems need air to work in the first place?
    But only the air in the room. Air conditioning cools the air by refrigeration. The heat extracted from the air has to be rejected into the environment outside.

    In a space capsule (yes, we know where you are going with these questions), you don't need refrigeration because space itself is cold (in the shade). All you need is a radiator on the outside and a circuit pumping coolant between the radiator and a heat exchanger inside the spacecraft. More here: https://www.nasa.gov/content/cooling...afe-productive

    So, no, you cannot say that "air conditioning can't work in space"! Try again.
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