10.05.2012: Please help keep our AC alive.

posted Oct 5, 2012, 2:07 PM by Kevin Chow   [ updated Oct 5, 2012, 2:15 PM ]
Please close your classroom doors when your air condition system is on. Do you know how AC works? Basically, it’s on the natural phenomenon whereby a liquid that changes into a gas loses a lot of heat. In any AC unit, a liquid that is normally a gas is compressed until its molecules are squeezed together into liquid form. That liquid is then run through a series of narrow copper coils where a big fan cools down the liquid. After the coils, the liquid shoots into a very spacious copper tube where *poof* the liquid suddenly reverts back to its uncompressed gaseous form, losing a lot of heat. Because it’s already been cooled by the fans through the narrow copper coil trip, this further drop in heat results in a very cold temperature. Fans blow that cold air into your room, and you get AC. 

If you leave your door open, the compressor will keep on furiously pumping, the gas will keep running through the coils going hot-cold-hot-cold-hot-cold, lots of electricity will be used, the fan will have to keep spinning at its top RPM, and eventually the system will just give up and conk out. Fan bearings wear out, compressors spring leaks… and you know how long it takes for AC to get fixed. 

So – please forgive me if I politely ask you to close your room’s door when I walk by and notice your AC on. Not only will you keep our AC alive, but you will be saving lots of electricity.