Destiny Hagest wrote:I'm not sure which videos or books you've read on the subject, but there are a lot of great learning resources out there that you can just soak in to help you get through this project - I find the more I understand something, the easier time I have working on it.
Ernie and Erica just released their Rocket Mass Heater Builder's Guide, and Paul's brand new DVD set, Better Wood Heat: DIY Rocket Mass Heaters is also now available for preorder. That one's kind of nice, because it shows you both a cob and pebble style, and also goes into the inner workings of the core of the RMH a bit more.
Rob Sigg wrote:I recently built a small scale trompe, here are the specs:
Closed system using a bucket of water being pumped to the top of the inlet and then returning to the bucket. Im doing this only to test out the dynamics of it, this will be used on a natural water way.
3/4 inch inlet with one straw for air introduction, this is about 8 feet tall
transition to 1 1/2 transfer pipe then to a vertical 3" air entrapment with 1/4 air compression gauge and valve. The air chamber is about 2 feet tall.
The outlet part of the transfer pipe then goes to 1 ". The outlet pipe is about 5 feet tall. I experimented with a one way valve to try and create back pressure. Youtube Mr. Teslonians Trompe Hammer for the gist of this.
No matter what I do I cannot seem to generate more than 1 PSI and of course once the pressure is releases the water level comes up and spills out of the top. I want to test this on actual falling water because I think it has to do with the volume of water going into the inlet pipe, it doesn't seem to be enough since im pumping through a 1/2 tube into a 3/4 inlet pipe.
If anyone has any further ideas/thoughts I would appreciate it and I can post more details if desired. I tried to contact Mr. Telonian but I can't find his contact info anywhere, he would certainly know the answer.
Glenn Herbert wrote:Looking good so far! You will get even better draw if you make the heat riser taller, ideally 3 to 4 times the height of the feed tube from the burn tunnel floor. Laying the riser bricks up on edge will get you more height while reducing the mass that has to heat up before the draft gets to its best.