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Old 04-23-2014, 11:19 AM   #1751 (permalink)
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Technically the answer is to make the rate of gas expansion slow enough that the thermal transfer can keep it at a constant temperature.

You can either slow the expansion rate of the gas, preferably without significant frictional, or you can increase the heat transfer rate to the gas. On balance, the easiest thing is a tank heater, in my opinion.

However, you're getting that energy from SOMEWHERE to begin with. Heat is the easiest thing in the world to get to, though. Your cell phone battery has a comparable amount of energy to a 68/45, but is much smaller and lighter. Liquid hydrocarbons have that much energy in about an eyedropper (1.2mL)
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Old 04-23-2014, 11:30 AM   #1752 (permalink)
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I just started my 400 level class on heat transfer and I'm really geeking out. I can't help but think about making a heat exchanger for a paintball gun. Probably not practical at all but still . . .
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Old 04-23-2014, 12:43 PM   #1753 (permalink)
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So, never?
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Old 04-23-2014, 01:00 PM   #1754 (permalink)
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Deleted post cause it was unnecessary.

Also lurker, no... Easily and soon enough. Over 60 isn't that tough.
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Old 04-23-2014, 01:23 PM   #1755 (permalink)
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Technically the answer is to make the rate of gas expansion slow enough that the thermal transfer can keep it at a constant temperature.

You can either slow the expansion rate of the gas, preferably without significant frictional, or you can increase the heat transfer rate to the gas. On balance, the easiest thing is a tank heater, in my opinion.
So we use in-grip bucket changer and make the grips out of peltier plates. This will also help Keep your hands cool.
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Old 04-23-2014, 02:39 PM   #1756 (permalink)
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made the second design up so that i could use a light helper spring. i will post my results.



no port holes yet. but it is already threaded and ready if needed. also added an o ring to the valve nut.
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Old 04-23-2014, 02:42 PM   #1757 (permalink)
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Old 04-23-2014, 02:47 PM   #1758 (permalink)
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yea. bored out the front and pressed in a plug. way easier than using a grooving tool.
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Old 04-23-2014, 06:00 PM   #1759 (permalink)
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Is the sail closer to the valve hole on this one? That could cut into volume...
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Old 04-23-2014, 07:00 PM   #1760 (permalink)
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Quote:
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I just started my 400 level class on heat transfer and I'm really geeking out. I can't help but think about making a heat exchanger for a paintball gun. Probably not practical at all but still . . .


Kind of a funky time of year to start a class, isn't it?

While you are in the neighborhood, see if you can find a temperature-entropy diagram for CO2. It's actually more thermo than heat transfer, but it can give you real heat values and you can compare them to adiabatic and isothermal values. It will tell you the total energy load for dumping a shot, but it will not tell you exactly where that energy will go, just somewhere between the 12gram and the end of the barrel (or a little beyond). We associate snow with poor efficiency, but cold muzzle blast shows that the CO2 is still picking up heat at that point.

There are good places to pick up heat transfer, and aluminum isn't far off from copper (that you will see in class). Check out stainless too, and you will see why stock automags do not perform as well as other designs for CO2. Hopefully they still cover Heilser charts; reg shape is the other sadness of the original mag and heat transfer.
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