Simon opaski

Peter Ellis wrote:Simon, with the wet cob, you are using loads of energy to push water out of the cob. It won't act to conduct or store heat, instead it will evaporate. That evaporation takes tremendous energy.

My RMH is very new and steaming as it runs, driving water out of the cob. I expect it will be doing this for some time.

thanks, so it might take a hole winter time? i hope not... i see it steaming strongly aswell. next time im building a rocket mass heater i will not use cob, i see cob as a poor conductor and poor heat storing material, the best thing is Definately river pebbles, not because i have it in abundance but because its Quartz, and quartz crystals are very compact glassy structures, another good one would be broken pieces of lead glass, A1 for mass..!!

allen lumley wrote:
When you are not trying to actively burn wood, shut the fan off and cap the top of the Feed Tube !

i do not use a fan. the rmh is running perfectly right now as well. very rockety. satisfied with burning, and the pipes are burning hot.
does anyone know whats the efficiency compared to a masonry heater?

Hey everyone, im sorry not to reply but i had so many things to do, I have rethinked and reobserved everything about the problems, it seems that its not even the pipe.. yesterday it was a windy day, and the rocket mass heater worked like a charm, it sucked air so perfectly with strong rocket sound and everything, i even lifted the burning wood up above 15 the feed tube and the wood was burning downwards, which means good drafting, i dont know if this days atmospheric pressure caused this but it was working nicely, The wood i burn is Black locust, Black locust is in abundance here and it burns amazingly hot, even if te wood is wet..
please note that i do not have a wind cap on the chimney and tis might be the simple problem i have, because i observed that wind direction affects the rmh, as a member said 9" inch piping should help turbulence may be he was right, once the rmh is hot enough it drafts like crazy and i even have blue flames. which i know is more oxygen gets drafted. and the wood burns hotter.

One thing im not for sure is why i have to burn so much wood and the mass doesnt warm, its wet but water conducts heat better than cob. Can it be that te mass is too thick and the heat cant get through?
Question: How come i need to burn so much wood with a wet cob, may be i wasnt listening but i dont understand whats the difference between dry and wet cob when it comes to heat dissipation.

allen lumley wrote:

They Will also add to the turbulence, but I expect that they will slow done even further your drying of the Cob. with dry Cob this might be a project worth considering ! what else
have you got ! For the good of the craft! Big AL

i have looked over the forum and found that many people have blowbacks, well some of them said they had put a wind turbine cowl on the chimney and it sucked the air out even on dead calm days.
what about that?

allen lumley wrote:

Using a clay slurry will simply add more water to your system when you are trying to decrease it! If you have an idea for a liner with higher Heat energy pass
through, great but I am blocked and will probably not come up with anything better !

i have quartz river pebbles in abundance, they have a smooth surface and are more conductive than cob, this need no binding material and is dry, but because of each rock has a different shape it could slow down the flow of air yes>?

My best advice is to get an inline booster fan or make one and see if your problems go away, yes you can get in there an reduce the Wettest cob off of the far end, if you
seal the material in plastic bags you may find months from now it is still wet and waiting to be reapplied, however it would be easy for you to really damage your
Horizontal chimneys stove pipe if you are not careful ! I am sure you know how likely a late november early December break in the weather is, better than me !

i thought of something to correct the inner diameter of my tube, i drew my pipe system in 2d
, the pipe is just going in a straight line but half way there is a slight angle then goes straight again
would filling in something to reduce inner cm3 help?

image of drawing: http://kepfeltoltes.hu/view/131126/pipe_www.kepfeltoltes.hu_.png

"" Going from an 8'' system to 9'' exhaust Is a problem, as is your failure to report a strong rocket sound will your Rocket is hot ! This Is most likely the cause of all your other
problems, I expect that the only way now to determine a positive course of action would be to use an exhaust booster fan near your final exit from the building somewhere
in a vertical (?) section, First this will serve as a test, and second a way to run your system while you keep warm this winter ! ""

Spent $700 for the pipe, its expensive stuffm any other way of correcting my failure? modifying the burn chamber or something?? bit dissapointed, how an 1" can make a difference, surprising...