Use bone dry fuel, moist will take up an enormous amount of power. In general, a level above 25% moisture will take up around 40% of the potential energy. All that water need to be evaporated before the temperature of the fire can significantly rise above 100 ºC, boiling point of water. In order to get to boiling point one would need a lot of energy. Once it is evaporated, a little energy will keep it in that state. See the example of a kettle of water on a gas burner: a quite substantial amount of time to get it to the boil at high fire, to keep it on the boil just turn the burner to low.
I opened the hole up in the steel plate for the primary air this morning. I figured the heater wasn't operating efficiently and maybe it was because it wasn't breathing properly. I started a fire with the same damp construction scraps I have used before.
Yes, Peter you are right. Dry wood makes a large difference and I am using a lot of the woods' potential energy just drying itself to keep the fire burning. The fires I have been recording have only been for heating and not cooking, but still, I'm wasting energy drying the fire wood in the fire box. If it were a month earlier, I would have plenty of really dry wood. Unfortunately, it's rained nearly daily for the last month drenching my supply of dry wood. I have been so busy with this and other projects I have neglected my wood storage. I do have some cherry scraps in the workshop I can fill the fire box the next fire I start. Those should be about as dry as wood can get if it was air dried. I can then compare damp soft wood and dry hard wood temperatures.
As I write this, I looked at the front of the heater and saw water dripping from the bottom of one of the panels. I opened the oven door to be met by steam to fog my glasses and just a little smoke smell (smell only, no visible smoke). This is a good sign! Previously, when I opened the door, smoke billowed out to fill the air. Opening the primary air up to nearly twice what I thought would suffice (coming from a traditional wood stove) has allowed the heater to take in enough air to burn hotter. Hot enough to burn much cleaner than before, even with damp wood. I looked at the chimney to see steam vanishing into the air instead of smoke drifting away to the neighbors.
Tonight, I look forward to burning the dry cherry to see what temperatures may exist in (and on the exterior surface) our heater.
Too warm tonight for a hot fire. It's 45*F (7*C) outside and still 70*F inside from this mornings' fire. I'm lighting a small fire to keep the heater warm though the night without getting too warm. We are really liking this mass heater stuff. I'll get the cook surface to where we can use it, I just have to tweak the heater or perhaps add a little rocket for meal time use. Maybe adding heat sinks to the underside of the cook top or add insulating trivets that can be removed for cook top access. I'll continue working on it and posting progress...or regress.
martinm: any one here with info \ experience with heat (from a mass heater) distribution with ducts throughout two storey house ?
Sept 8, 2018 22:58:52 GMT -8
padica: Good morning, this is a wonderful subject, please someone can help me with the theme of double and triple combustion, how it is achieved, theory and design, thank you
Sept 15, 2018 7:13:40 GMT -8
wiscojames: I'm afraid you won't get a response to such a vague question - I suggest reading through some of the threads related to your questions before asking for an explanation. People will be very generous with their knowledge if your question is more specific.
Sept 18, 2018 4:48:00 GMT -8
daniel: in my experience as I am working now on something of that nature, I have thought of making a heat exchanger and distributing the heat through vents using a slower fan. Now after a few years I realize that mass heaters give out primarily radiant heat, for
Nov 30, 2018 12:48:38 GMT -8
coastalrocketeer: Anyone posting in this shout box... if you have something you want people to see and respond to, create a thread in the appropriate forum section... this is not the place...
Dec 16, 2018 18:10:49 GMT -8
vesuvius: High Temperature Glass options,
Jan 4, 2019 16:28:17 GMT -8
vesuvius: Do any of you have experience with using the glass from home oven doors on a rocket stove? I'd like to have a viewing port on my stove but don't want to fork out for new ceramic glass. Any thought as to whether it would take the heat of a rocket stove?
Jan 4, 2019 16:30:40 GMT -8
yaya: you dont need the blowair for that temp..
Jan 13, 2019 16:43:57 GMT -8
flybywire: Glass window from an old washing machine is designed to take high temps. Cheap solution to your need.
Jan 27, 2019 0:10:58 GMT -8
coastalrocketeer: Anyone posting in this shout box... if you have something you want people to see and respond to, create a thread in the appropriate forum section... this is not the place to have a discussion... it is for short announcements
Feb 7, 2019 0:11:23 GMT -8
coastalrocketeer: you won’t likely get replies to questions here, and it is not a spot that makes holding an ongoing discussion possible...
Feb 7, 2019 0:12:22 GMT -8
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