Crinstam Camp wrote:
I'm still confused how I can get different readings on every damn meter I use and why it dropped from 13.5 to 13.2/13.3 just from hooking it up, but it's definitely holding charge better now than when I had the 6 batteries hooked up.
Glenn Herbert wrote:Nice construction work. Is this a 4" square system? The feed tube is much too tall relative to the riser, so that it may be difficult to establish strong draft in the right direction. I think a 16" or so long feed would be better. How tall exactly is the riser? A general rule of thumb for rocket mass heater J-tubes is 1:2:4 or 1:1.5:3 for feed tube, burn tunnel and heat riser. A 16" feed would give at least a 48" riser. You are missing the burn tunnel entirely as is typical with K-style rocket stoves.
A major factor in effective combustion is to keep the fire as hot as possible until it has finished burning, and only then allow the heat out to do work. If you let the whole combustion core shed heat to the air, the fire will never get really hot, especially in a small system like this. You need plenty of insulation to keep the flame hot all the way to the exhaust.
You mention a cap on the feed tube; I hope you have put a cap on the bottom leg, cleanout or air supply or whatever you intended it to be. Too much air can dilute the heat and reduce the effectiveness of combustion.
Three "T"s of combustion: time, temperature and turbulence. The fuel gases need to stay hot enough for long enough and have enough turbulence for good mixture. Insulation will help temperature. The "V" flame path is not likely to give the gases enough time to finish burning or turbulence for thorough mixing. If flame comes out the top, you are wasting fuel. Most of the fire is in the riser, with not much to make turbulence. If you must use the sloped feed, at least connect it to the bottom leg rather than the riser so there are direction changes in the flame path to give turbulence and more length for dwell time.
Jonathan Ezell wrote:i don't know if growing peas in a shadier spot would enable podding. maybe shade plus mulch & a sunken/depression bed* for cooler soil temps, all while not creating a drainage problem. etc micro-climate methods
good luck with your vegetative crew.
*the opposite of a raised bed.