I know that there’s the things in the attic that blow the air but what about the things outside the house with the large fans?
In: Technology
When the doctor gives you a shot, or sometimes they rub rubbing alcohol on your arm.
Rubbing alcohol has a low evaporation point, this means that it dries quickly and turns to gas. Because of this low evaporation point, it also feels cold.
Liquids tend to try and absorb heat. By absorbing heat they can make something cool. If you get your shirt wet, it will feel cold because it’s absorbing heat from your body. Eventually the shirt will dry on it’s own, even if the water doesn’t boil. Water takes longer to dry than rubbing alcohol because it has a high evaporation point, and it also doesn’t feel as cold.
A/C uses a special material with a super low evaporation point. In the attic this liquid is pumped through metal tubes and it makes the tubes cool. Once the liquid heats up though, it’s no longer a liquid and it boils and turns to a gas.
This gas goes through a pipe to the box outside. The box outside does two three things:
1. It squeezes the gas so hard that the gas turns back into a liquid. When you squeeze a gas to make it a liquid it becomes even warmer, so now this warm gas is a hot liquid.
2. There’s a fan that blows air through the pipes that carry the hot liquid, and the hot liquid turns into normal temperature liquid.
3. The normal temperature liquid is pumped to the attic.
In the attic, the cycle repeats. The normal temperature liquid goes through a zig-zag pipe where it makes the pipe cold. In the process, the regular temperature liquid dries up and turns into a warm gas where it goes back to the outside box. There’s a fan in the attic that blows air against the cold pipes and that air then becomes cold from touching the cold pipes.
The pipes between the box outside and the box in the attic aren’t cold because they’re wrapped in a blanket. In the attic there’s no blanket so that pipe becomes cold.
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