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New outside vented stove design
#11
(12-07-2017, 08:39 PM)Weight Wrote: There is a reason to use steel or iron for contact with gas flame. Aluminum can ignite.

Most cookware is aluminum. You need extreame temperature and air to ignite Aluminum.
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#12
(12-07-2017, 07:16 PM)skyl4rk Wrote: Some thoughts:

Make it so that it can be mounted vertically so it doesn't take up much room.
Or flat on the floor, strong enough to walk on.
It should be able to operate at low levels when you don't need a lot of heat.
Can it be run overnight safely?
Can it be run without a fan?
Is it too hot to touch without burning yourself?

It has to be at 45 degree to work without a fan. Not everyone has power storage to run fan all night. If you place it verticaly, you need a fan to blow thru holes. If you lay it down, the gasses will not rise and you will need long vertical exhust pipe to create suction
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#13
(12-07-2017, 10:02 PM)tx2sturgis Wrote: It's a basic design that could work but...

It definitely needs a safety screen or grill around the front and probably some insulating standoffs for the fan frame. 

And it needs a real safety valve with a thermocouple. 

It reminds me of a simple heat exchanger...just have to use the right materials and balance the sizes of the different parts to match the heat levels.

Still, you may be on to something here!

The front grill would require more manufacturing steps and safety switches would complicate everything and now, it neads power to run it.

Im trying to keep this design simple and available to anyone. I will have couple shops quote it but i will upload all CAD drawings here so you can try to build it elsewhere. 

Milling machine will be needed. Does not have to be CNC as i keep everything in straight lines for easy of machining.
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#14
(12-08-2017, 04:47 PM)planet-beaver Wrote: The front grill would require more manufacturing steps and safety switches would complicate everything and now, it neads power to run it.

Yep but off the shelf hardware cloth (metal mesh) would be super cheap and easy. And the fan is using DC power, so you would already have DC in, and the safety valve and thermocouple do not need external power, thermocouples are heat powered.

For high pressure propane, you need a regulator, but that can be at the tank, rather than at the heater.

Then also you would probably combine the safety valve with the tube and gas orifice, gotta have that. And maybe a way to regulate the air intake, for different altitudes. 

These are a few things it would really need to have...just sayin...
Never trust a camp cook with lots of shiny new pans...
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#15
I prefer simple and no electricity needed. But I don't have much floor space. Could this be mounted under a desk or bed? Or movable?

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#16
Is this device "smart" enough to vent out only the by-products of combustion and not the heat?
Someone wanted me to put this here: http://rollingsteeltent.blogspot.com/
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#17
A couple more questions: Does this use regulated propane or high pressure propane? Is it one setting only, or can it be adjusted - high, medium, low?

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#18
The flames can heat air directly, but you're using the flames to heat the metal and the metal to heat the air. That seems less efficient.
Someone wanted me to put this here: http://rollingsteeltent.blogspot.com/
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#19
On all vented, gas fired heaters, there is always a metal barrier between the combustion process and the heated air on the other side.
Never trust a camp cook with lots of shiny new pans...
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#20
> Most cookware is aluminum. You need extreme temperature and air to ignite Aluminum.

I've many times let an aluminum pot boil dry and returned to a molten puddle.
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