new videos
hot off the press!  
    more about rocket
mass heaters here.

more videos from
the PDC here.
  • Post Reply Bookmark Topic Watch Topic
  • New Topic

RMH black goop exhaust  RSS feed

 
shadrick wilsons
Posts: 19
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Greetings. I'm still in the process of adding more mass to my bench but my rocket seems to be working perfectly. The only concern I have is in my first inspection I noticed a black goop accumulating at the clean out at the vertical exhaust. I also put my hand in the final exhaust cap above my roof and there was some black soot accumulating. What could this be? Signs of a serious incomplete burn? The exhaust comes out warm but not hot. The exhaust is also dripping hard. Thanks!
20151109_105904.jpg
[Thumbnail for 20151109_105904.jpg]
 
shadrick wilsons
Posts: 19
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Another pic showing goop
20151109_105840.jpg
[Thumbnail for 20151109_105840.jpg]
 
Glenn Herbert
gardener
Posts: 2180
Location: Upstate NY, zone 5
74
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Any kind of goop accumulating in the exhaust of an RMH is bad news. Obviously you have some kind of problem with incomplete combustion, but we need many more details of your system to begin diagnosing the cause. What is the character of the burn in your feed? Pictures and full description with dimensions please...
 
Satamax Antone
gardener
Posts: 2280
Location: Southern alps, on the French side of the french /italian border 5000ft high Southern alpine climate.
55
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
To me, that looks a lot like fly ash mixed with condensed moisture!
 
shadrick wilsons
Posts: 19
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
What is fly ash? Also realized I forgot to add the spacer like I planned! Gap was 5 inches. Put spacer in to make it 2.5 inches. Just put it together and works even better! Yay! Dimensions otherwise are 8 inch system 7x7 burn chamber 7.5 highx7. 35 feet of pipe after accounting for 3 elbows. I guess I'll let this run some more and see if I get buildup.
20151109_143653.jpg
[Thumbnail for 20151109_143653.jpg]
20151109_140951.jpg
[Thumbnail for 20151109_140951.jpg]
 
thomas rubino
Posts: 828
Location: latitude 47 N.W. montana zone 6A
41
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Fly ash is the superfine ash left over after a burn. When your mass is finished and completely dry your dripping will stop (mine took almost 6 weeks) Now that you have reduced your top gap , you will see higher temps & that in turn will help your mass dry out. Your chimney top temps should be in the 130 F. range when you get everything warm and dry. Remember that the vertical rise after the mass does not count against your 50' limit on an 8" system.
 
Ron Helwig
Posts: 130
Location: New Hampshire
10
forest garden hugelkultur tiny house
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
This sounds a lot like my experience last winter. In my case the exhaust exits the building horizontally and immediately Ts to a chimney. Due to a slight miscalculation the exhaust tilts downward for the last 10 or so feet of the horizontal part, and I got a large stalagmite of ice under the T. The system didn't "rocket" as much as I thought it should and often needed some help from a fan. But this year (so far at least) since I added more mass around the burn and feed area as well as using dryer wood, it has been acting much better. I am hopeful that much of the moisture I saw last year will be gone as more of the mass has dried and I'll be putting less into it in the form of green wood.
 
I agree. Here's the link: http://richsoil.com/wood-heat.jsp
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!