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How do I make hot air, become cold air?

  • I live in Texas, it gets hot in my un air-conditioned garage so, I wanna make it cooler, but not just with a fan. My creative juices are flowing, so I want to build a home-made thermodynamic heat transfer cooling system. Aka an airconditioner. I have seen plans online for just wrapping some copper pipe behind a fan and running it through some cold water with a pump and Ice, but I want to take it a step further. I want to use two chambers possibly three if I cant make it a sealed system. I have a small air-mover and want to create a cold box with the airmover blowing through it and copper coils internally, this will be sitting on a pan of some kind to catch condensation. I have the idea to use a small ice chest with a no lid as the cool point. running copper pipe in an s configuration in the water with both ends coming out the top. I will freeze the water and copper together, ice chest and all, in a reach in freezer. I will use a fish tank pump to move some sort of refrigerant through the lines. I will have one pipe of the ice chest connected to one pipe of the cool-box and the other two connected through the fish-tank pump in a sealed system. The next part of the equation is the heat transfer medium aka refrigerant. That is were I need help. I have been doing some reading and I know that I need something with good thermodynamic properties but remains in liquid form. The only really good thermodynamic product easily is ammonia. It is cost effective, but I am not 100% sure its what I want. Also I have heard that ammonia is caustic and may damage rubber and plastic parts of the pump. I need suggestions. Also if you think my design thoughts are flawed or have better Ideas, I am open.

  • Answer:

    for heat transfer you will be much better off using automotive antifreeze rather than ammonia. I think ammonia and copper don't get along well, I know for sure that ammonia damages brass (a copper alloy)

John B at Yahoo! Answers Visit the source

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for heat transfer you will be much better off using automotive antifreeze rather than ammonia. I think ammonia and copper don't get along well, I know for sure that ammonia damages brass (a copper alloy)

tinkerta...

There's probably hundred ways to tackle your problem. However, from practical/money sake, the easiest way to get your cooling is just get a window/portable air conditioner. I mean face it, for $50 on craigslist, your can buy a used air conditioner to cool your garage. Coming up with your own heat transfer cooling system, the parts alone from home depot will well run you over couple of hundreds of dollar not to mention the pain and agony of putting it together to make it work. In my opinion it's not worth it. I'd probably put more money in to solar panel and try to come up with ways to run self sustaining HVAC. In asian countries, they actually run 12V split system which is very efficient and can be adpoted with solar panel - battery feed.

IKNOWALL

There's probably hundred ways to tackle your problem. However, from practical/money sake, the easiest way to get your cooling is just get a window/portable air conditioner. I mean face it, for $50 on craigslist, your can buy a used air conditioner to cool your garage. Coming up with your own heat transfer cooling system, the parts alone from home depot will well run you over couple of hundreds of dollar not to mention the pain and agony of putting it together to make it work. In my opinion it's not worth it. I'd probably put more money in to solar panel and try to come up with ways to run self sustaining HVAC. In asian countries, they actually run 12V split system which is very efficient and can be adpoted with solar panel - battery feed.

IKNOWALL

i think it would be easier to drill holes at the top of your room's wall and let the hot air out, since hot air rises up on heating. Then switch on the fan to cool your room down. Put some kind of net or window screen to keep out the insects. Always worked for me :)

In Christ alone

All of your answers so far are wrong. Hot air does indeed rise. Why does this happen? Well, its because the pressure in the atmosphere falls as you gain altitude (because there is less atmosphere over your head pushing down); the hot air is less dense than that around it, so this pressure gradient gives rise to a net force pushing up on the hot air. But as the hot air rises it experiences that lower pressure. And so it expands. From the gas laws you will know that if a constant mass of gas expands without any energy input it cools down. Utlimately it will cool down enough that it no longer rises. What this means is that air is naturally cooler the higher you go. The atmosphere is in a stable equilibrium when the change in temperature as you rise is exactly what is necessary to stop pocket of hot air rising. This is called the adiabatic lapse rate, and it is about 0.65 C per 100m. So if you go up a 1000m mountain the top is 6.5C cooler than the bottom. If you go up to 10,000m in a plane it is 65 C cooler (the outside of a plane is typically around -50C).

Karen

i think it would be easier to drill holes at the top of your room's wall and let the hot air out, since hot air rises up on heating. Then switch on the fan to cool your room down. Put some kind of net or window screen to keep out the insects. Always worked for me :)

In Christ alone

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