Hello,
I am looking for some advise. I have a plan and I don't know if it has any merit, so I would love some feedback from more experienced rocket builders.
I have a 1.2m diameter aluminium tank which I've cut in half. One half is a cold plunge pool. The other half I want to turn into a hot tub.
I tried making a rocket fire already which had the flames running over a copper coil... but the heat transfer was so slow that I would have had to wait for half a day just to heat up the water. I also made it from old benchtop offcuts which began disintegrating under the extreme temperature. So it eventually destroyed itself anyway.
I figured that direct heating would work better. So I thought why not run the burn tunnel in direct contact with the base of the tank. You can't really get more direct heat transfer than that.
My question is whether the dimensions (see attached images) will allow me to run this properly. As I said I'm not very experienced at this stuff so I would love someone else who is to let me know whether what I'm proposing is feasible.
It seems that burn tunnel is longer than recommendations that I've seen before. What happens when the burn tunnel is longer? And what effect does the width of the burn tunnel have too?
The burn tunnel is currently 300mm wide. This means that the burn tunnel has to be a minimum of 1068mm long (see attached image) plus the space required for the chimney and feed. I could make the burn tunnel narrower which would mean the chord length across the edge of the tub is a shorter distance to cover. But I'm also not sure whether this is important and what impact it would have reducing the width of the burn tunnel. It seems there's some competing variables in this equation.
Would love to hear your feedback! Thankyou