Jeremy Stewart

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since Jan 08, 2014
Hillsboro, Alabama
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Recent posts by Jeremy Stewart

I think we are on the same page, yes. I could not view the video on the post you linked below, but judging by the descriptions I think so. There would be minor differences as far as usage. Meaning I simply need the water to transfer the heat from one location to another where it can then be delivered via radiator. I work with large gas fired boiler systems at my job, but we use pumps to move the water. My main concern with this setup is...too efficient? It's hard to turn a fire OFF. The greater the temperature difference between the hot and cold sides, the stronger the siphon. Too great you'll get thermal shock, maybe stall the system. Too little, the water temp would equalize, also stalling the system, but leaving a very hot radiator in my little rooms. That might also create some overheating of the system and cause boil off.

I thought that running the water coil through a significant amount of mass surrounding the riser would heat it enough, and long enough. I'm not so sure it's the most efficient way of getting heat where I need it but the other options won't work so well. Can't have an open flame, no room for a thermal mass or an indoor stove of any kind. I don't want to resort to propane heat when I know there should be an alternative. Just have to work out the kinks.
6 years ago
Ok, great.

So I'd thought to have just a beefy poured refractory, what I see you guys calling a core. Having never used one of these I'm not sure how long the stone with hold its heat. I'm picturing a 30" square, with about 5' or 6' tall poured riser. That would have a 10" inside pipe with no secondary. I'm not sure how long that would take to heat up, but I'd guess it would hold a fair amount if heat for several hours.
6 years ago
Yes, I understand the fast burn. I see quite a few designs with a relatively short "wood storage" chute, about a foot. This J- tube has a vertical wood feed. So if it were taller. Could I use longer slats of wood to create a self feeding burn that would last longer? I didn't mean to smolder it, just didn't want to choke it out with too long of an intake full of wood.
6 years ago
Good afternoon everyone.
I'm new to the site, but there seems to be quite a bit of knowledgeable people here. I was hoping to get some pointers on a project I'm working on.
I have a small, two room cabin that I am trying to heat. I built this out of 8' landscaping timbers to give you an idea of the scale. There are two 8' square cabins connected by an 8' dog trot. I have a couple of heater cores like you'd get out of a central unit on your house. I thought about running hot water through these using s thermosiphon system ran off a j-style, poured "concrete" rocket heater that I saw online.
The design was simple enough, but since its a solid pour, I need to hammer out all the details before hand. I have a few sections of 10" stove pipe I thought to use as a stack. I figure I can wrap 1/2" or so copper tubing around the stack before I pour so it will be set in place. The burn chamber I figured I could construct a square framework. I think the mass of the "concrete" will hold heat to give me a nice warm fireplace, and also heat the tubes enough to get a strong supply of hot water to my radiators.
Here's where my questions come in. I've never done ANY of these things. I understand the concepts of all of it, but are there any certain EXACT ratios that need to be followed?
For instance, I'd like the capability of a long burn so you could start it before bed and it would stay going, or at least warm until morning. So can the "j" portion, for wood feed, be taller to accept longer kindling and it not effect efficiency? With a 10" exhaust stack, is there a particilar size that the burn chamber needs to be? I fired 10" all the way through but I honestly don't know.
On the water heating part. I know that hot water will rise and create a flow, but if the entire system is basically a loop of 1/2" copper tube, appox. 30' long...will that circulate? I worry that the radiators won't draw enough heat and the water temp will equalize in the tube. This would be fine as far as a heating stand point, but if it gets too hot and turns to steam...I just worry lol.
Anyway, I could go on all day. I hope my ramblings aren't TOO confusing. Thanks in advance for any help you all can provide.
6 years ago