Hi this is my reaction to this thread donkey32.proboards.com/thread/954/approx-btu-output-rocket-systems .So yesterday i have try to compare those two systems 20cm/8in J tube and 15cm/6in batch box.Both of them are in my house.For this test i have used really dry pine wood,one year in wood shed and 3days ontop of mý stove. Im calculating 4Kw per 1 kilo of wood at 100 percent combustion.So at 80 percent combustion¨/whitch is only a guess i use/its 3,2Kw per 1kg of wood. So i have wormed up the batch box by burning half of full load in it.At 12pm i loaded the batch box full, whitch took 4.5kg of wood.At 12.25pm i was able to add /but the batch box wasnt fully empty yet/another 4kg of wood.At 13pm/one hour from start/there was pile of red ambers.So the 15cm/6in batch box is capable to burn 8.5kg of dry wood in 1hour whitch would be 8.5kg x 3.2Kw is 27.2Kw/h. I have to add i try to add as much of the wood as i could within this 1 hour run.Normaly i wouldnt run the stove like this. The J tube 20cm/8in was warm as well when i start the test,and the pine wood was same as in the batch box.So at 18pm i filled the fire chamber with 2.5kg of wood,at 18.30pm i added 1kg and at 18.40pm 1kg more.At 19pm huge pile of ambers.So the 20cm J tube was able to burn 4.5kg of wood in 1 hour. 4.5kg x 3.2Kw is 14.4Kw/h but again in normal conditions i wouldnt run the stove like this.Donkey if you think it does not belong to this section please move it,i just wasnt sure.
The combustion efficiency of a rocket is pretty close to 100%. However the total efficiency of a heating system will be always lower, as a part of the released heat will went through the chimney. A system as described in the rocket bible is extremely efficient due to very low exhaust temperatures. 50% or more of the wood mass is water. The amount of chemicaly bond water exceeds the moisture by far. Several kilo of water steam will take a lot energy out of the house if the exhaust temperatures stay above 100 C°.
TexasGonzo: Sooooo glad I found this site! Its always rewarding to find such a super group of folks! To any and all, feel free to PM me anytime. Thanks for having me!
Mar 11, 2019 18:56:41 GMT -8
jlmtech: GADGET: CONSIDER USING A JET PUMP INSTEAD OF A BLOWER FAN TO INDUCE DRAFT; NO CLOGGING.
Mar 26, 2019 8:19:28 GMT -8
michaelegan: i am unable to open the sketchup files on my mac. I used sketchup a few years back but apparently the company now requires a subscription. does anyone have any advice/instructions on how to use the program or how to view pictures without spending money?
Aug 20, 2019 18:41:48 GMT -8
mannytheseacow: michaelegan: download AutoCAD student version for free... import .SKP
Aug 23, 2019 13:33:44 GMT -8
topbaza: hi everyone, been searching all over net and this is were i need to be i think!!
Sept 28, 2019 6:16:25 GMT -8
anounaki: Hi, why I cant upload photos when I make new tread to this forum?
Feb 28, 2020 2:09:40 GMT -8
ahansen: photos under 1 mb not possible?
Jun 4, 2020 0:09:21 GMT -8
belgiangulch: Photo's are possible. They must be downloaded elsewhere and the image url (adress) is copyied.
Sept 14, 2020 7:26:15 GMT -8
belgiangulch: While creating a thread click on the small picture in the banner above the reply. A box pops up, paste the image url in the box. Pay no attention to the huge list of numbers and such.When you finish and hit reply your post with pictures will come up.
Sept 14, 2020 7:29:27 GMT -8
deadstarsstillburn: Hi there. I was directed this way by folks on the Permies.com website and am hoping I can get some information on how a total newbie can get started designing, siting, building, and not-dying-in-a-horrible-house-fire with a new RMH in a 160-year old home
Oct 21, 2020 6:52:10 GMT -8
deadstarsstillburn: The people over there recommended either a 6" batchbox or an 8" J-tube. I don't know what those are but am going to try to figure that out. What I need is a blueprint that I can scale to fit the need for my house. I have something likne 5000 square feet
Oct 21, 2020 6:53:00 GMT -8
deadstarsstillburn: but I do not need to heat all of it by any means. probably only need to heat half of that, maybe less.
Oct 21, 2020 6:53:15 GMT -8
deadstarsstillburn: moreover, the house has 3 storeys (large attic) so I assume if I get very efficient heating on the ground floor, that will go a long way toward heating the upstairs as well, no?
Oct 21, 2020 6:53:59 GMT -8
BenAlexanderT: Happy new year everybody. I wish you the best
Dec 31, 2020 15:06:14 GMT -8
Solomon: Anybody in Southern Oregon, in Jackson or Josephine counties?
Jan 16, 2021 21:54:43 GMT -8
gnomedome: i realsie this is from 2009
Apr 14, 2021 8:30:44 GMT -8
gnomedome: i realize this is from 2009 id love to see the photos from this ..as im looking to build a sauna soon similar to this .... if anyody sees this post firstname.lastname@example.org..... the photos in this post did not show up
Apr 14, 2021 8:32:00 GMT -8
dcoyte: I am planning to use a cast iron heat exchanger out of a hydronic boiler set on top of my rocket stove, flue out the top. There will be a pump moving the water through the heat exchanger into an unpressurized 2000 gal tank. Any thoughts?
Dec 31, 2021 6:45:55 GMT -8