I now proclaim that the "First Zaf's How It Works Contest" is open!
There will be a grand prize (trully grand...) for the person who will submit (in writting) the best explanation for how cooling machines work. By "Cooling Machines" I mean refrigerators, air conditioning, any kind of machine that "produces cold".
Here's a reason for the contest: More or less, everyone has some understanding of how you can produce heat at will, but cold? How can you produce cold? So, give it your best shot. Here are some terms you may find usefull in your research: thermodynamics, heat pump, freon, gas laws...
Submissions until the 26th of september... Submissions must be in .pdf, .doc or .rtf format. No links to ready-made explanations allowed. You must write your own. Have fun!
5 comments:
Αρχίζω να ανησυχώ, πως σου ήρθε αυτή η ιδέα; Βέβαια το γεγονός για το οποίο ανησυχώ ακόμα περισσότερο είναι ότι το σκέφτομαι σοβαρά να συμμετάσχω.
Το priZe τί θα είναι;
siga siga vlepw sta blogs sas na vgainoun oles oi anhsuxies kai ola ta erwthmata pou exei auth h parea edw kai polu polu kairo.. 8umamai kati eixa diavasei gia to 8ema otan eixe prwtoemfanistei sta matia mas.. htan prwi t'augoustou, konta sth rodaugh.. nomizw se ena party. anygay, gl hf..
ego aftin tin aporia tin eixa apo to lykeio... eixame vrei kapote to pos kai to giati... alla den ginete na vgazei krio.. pos to lene.. den ginete.. einai adinaton.. to oti doulevoun ta psigeia kai ta aircondition einai mia psevdesthisi... den ginete na paraxthei to krio... apla den ginete.... :)
etsi opws ta leei o lipis einai.. kai o Elvis zei..
As matter changes states (solid, liquid and vapor) it absorbs or emits heat. If you pour water on your skin and you blow some air on it, the water will evaporate giving you the feeling of cooling down. It is indeed actually absorbing heat from your skin to evaporate. I think that the principle of cooling is very similar; change the state of the matter (liquid or solid) to something that requires the consumption of heat, thus cooling the object in question. So instead of "generating cold" we are actually "consuming heat".
Now, if you ask me how exactly the fridge or the aircon works, then hmmmm I don't think I can answer that. Bugger, and I thought I was doing well. :-(
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