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Forum: Chat Room
Thread: FREE COOLING |
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Thread Status: Active Total posts in this thread: 13
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Jack007
Master Cruncher CANADA Joined: Feb 25, 2005 Post Count: 1604 Status: Offline Project Badges: 
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OK,
----------------------------------------I'm wondering if any of you can explain in simple English (yes I've searched the web answers weren't simple) why can't we take the energy in the hot air at the top of a room, which would result in cooling and the now cooler air would sink to the bottom of the room, and make a bit of electricity (NOT THAT I CARE ABOUT THE PITIFUL AMOUNT OF ELECTRICITY, IT'S JUST THE FREE AC I CARE ABOUT) My caps are for the brainiacs in the science thread I was reading about talking about how in super best case scenario a machine could make 20 pounds in a year so it's not efficient..... The brainiacs were missing the point. The point is to provide free cooling. Who cares where the energy gained goes to (it would be miniscule to the amount of energy used to power AC units). All serious answered appreciated, and if you have to quote science that is GREAT, but please explain after as you would to a child, I'd appreciate that   |
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
The temperature differences between the top and the bottom of a room are so small that energy contained in the difference isn't enough for some one to make a commercially feasible device.
A heat pipe could be used to take heat out of the room, but the temperature difference they make isn't that large either. By "MAKING ELECTRICITY" I assume you are implying the use of -thermocouples. To work at all, the union of a thermocouple has to be warmer than the other ends. They aren't very efficient in changing heat into electricity and would require you to keep the lead ends cooler than the unions, which will cost energy in itself. It's cheaper to vent the heat out passively while that air flow draws in cooler air from say a buried tubing that goes for a ways under ground and to an air intake. Technically thermocouple cooling a house is possible, but the present technology is too inefficient and prohibitively expensive... |
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KLiK
Master Cruncher Croatia Joined: Nov 13, 2006 Post Count: 3108 Status: Offline Project Badges:
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just love it when someone watches a show & has an idea...but lacks knowledge in thermodynamics to make it happen...& really lacks a effort to do something about it, like: learns thermodynamics! it's not that difficult, you know?!
----------------------------------------anyway...for a room with a height of up to 4m, you don't have enough diversity in temp to make an efficient device which would transfer some thermal (thermo-coupling) or kinetic (wind-power) to a good use! it could be done if you have a nice big tower with a lot of heat build up in it... ;) though, I've designed one system that could cool of about 1-4MJ of heat from computers by fluid...& it did (on paper) work on that idea...but you still need a: - room to put it - fluid pump to pump that fluid around the cases & computers (electric power) - fluid to decide which to put in a system ('cause best fluids for that are bad for human exposure...& I'm a lot of time in my computer room!) - probable leaks in a fluid system so I just gave up from the idea! B) |
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enels
Senior Cruncher Joined: Apr 25, 2008 Post Count: 286 Status: Offline Project Badges:
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Aye. The laws of thermodynamics be a harsh master. I doubt you could generate enough electricity for a fan to circulate the heat out of the room (getting cool air from outside presumably). Much less power a pump to blow cold air in.
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
There is NOTHING wrong with the question. No one is knowledgeable, much less expert in all subjects.
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
The "heat Pipes" used on computers are simply tubes with water in them. Refrigeration heat pipes contain a wick and have conduct heat much better. Using a combination of refrigerant and vacuum, you can vary the temperature that the heat pipe starts conducting heat at.
http://www.aavid.com/product-group/heatpipe/operate Just think one multiple of these with fins like a heat sink to boost their performance. They only move heat in one direction though. |
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Jack007
Master Cruncher CANADA Joined: Feb 25, 2005 Post Count: 1604 Status: Offline Project Badges:
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just love it when someone watches a show & has an idea...B) Actually I didn't watch a show, it just came as an idea that if molecules are excited (thinking water here for example) and we can slow them down to make ice if we could do something to air without having to pipe it all over the place it should cool and would then naturally just fall... Thank you all for your responses, I'm going to check the links and do more research, I'm 99+% certain if it could be done it would have been done. I live in a 4 story townhome, and the air in the bottom level is quite a bit cooler than the master bedroom, we use a portable AC in the summer, but if I could pipe it up could probably go a couple months without AC... but then the piping would be not allowed by my wife :D for good reasons. So I'm off to start trying to learn P.S. I've had sleep apnea since forever so my brain works, but not the memory portion I can't learn advanced math cuz I keep forgetting the beginning. It sux, cuz I would have loved to be a scientist. |
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
To bad you don't have an attic fan on the top floor...
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enels
Senior Cruncher Joined: Apr 25, 2008 Post Count: 286 Status: Offline Project Badges:
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Or a 'whole house fan'. You are a scientist Jack007, by asking interesting questions. You probably have a lot of time to think walking between floors.
----------------------------------------[Edit 1 times, last edit by enels at May 1, 2016 11:08:06 PM] |
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cjslman
Master Cruncher Mexico Joined: Nov 23, 2004 Post Count: 2082 Status: Offline Project Badges: 
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just love it when someone watches a show & has an idea...but lacks knowledge in thermodynamics to make it happen...& really lacks a effort to do something about it, like: learns thermodynamics! it's not that difficult, you know?! I just don't love it when somebody puts somebody down for asking a question and then shows off they know the answer... & really lacks the niceness to do something about it, like: answer politely! it's not that difficult, you know?!CJSL Crunching for a better world... |
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