Greetings from the North Cascades.
I have three questions regarding people's rocket mass heaters:
Have anyone designed one that uses outside combustion air?
Is 6 inches is a good minimum diameter for your exhaust stack?
Is 2 inches clearance between the top of the riser and the barrel covering it a good dimension?
Has anyone built a hybrid that works with a water jacket?
Lolly K wrote:Has anyone tried using an old vehicle radiator as a water jacket?
Ruwenzori McCoy wrote:Dear Len,
Thank you for your input. Have you used a 4 inch diameter chimney?
Does CSA stand for "cross-sectional area?"
Am I correct in understanding the the CSA of the vertical wood feed should be 1/3 to 1/4 of the CSA of the insulated chimney, and that the exhaust pipe leaving the riser can be 1/2 of the insulated chimney?
Finally do you have guidance on ratios of the diameter of the chimney to the diameter of the riser?
Ruwenzori McCoy wrote:
Are you calculating the riser CSA by subtracting the CSA of the insulated chimney from the CSA computed with the internal diameter of the riser?
Are you exhausting your RMH inside or outside of the house?
Are you aware of any materials that would serve as a good thermal mass, but are lighter and more appropriate for a mobile RMH.
allen lumley wrote: Kia Tikaboo : you can look into Glaubers salts, (try Wikipedia ) its a steep learning curve but the stuff is so cheap they use it as filler in laundry soap. properly set up it could be a remove-able part of your thermal mass. lift a self contained amount of it out of your bench and take it with you to be a personal heater at a separate location !
allen lumley wrote:Len : if you know a good source for cheap tin,go for it, your system would need to be fume-proof but other wise close to ideal You may already be aware of the use of molten tin in the manufacture of float glass where they keep the tin bath in a nitrogen atmosphere under positive pressure to deal with Tin Oxides ! I can not see a reason why a thermo-syphoning, system would be impossible, and I don't think there is much change in volume with phase change ! My answer was for Kia Tikaboo who will never get an ideal material for use in a thermal mass that will make a portable Rocket Mass Heater, but a R.S.M.Heater, can make use of a phase changing material for portable heat ! Some where i have basic BTU per # info, it will take me a while to find ! Pyro-Al
allen lumley wrote: Len Ovens : - thinking off of the top of my head there all many types of insulation that protected from abrasion can be effective in thin layers, With a small rocket stove co-located with the boats propulsive system for safety, weight distribution C.of G. common intake/ separate exhaust, your thermal battery would be an almost ideal material for a weighted keel !?!!
As an exersize, or flight of fancy this might appeal to Ernie Wisner who is a Steward in these pages ! Pyro-Al
Richard Gurry wrote:Maybe you could contact these people to find out what kind of phase change material they use.
Closer to the same temperature, glad I remembered the kickstarter project.
Andor Horvath wrote:Hi, the phase change material referenced above is probably sodium acetate; inexpensive food grade is the ingredient in re-usable hand warmers etc. see wikipedia