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Lazy Al deadcarp--another question
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CAH    Posted 02-18-2004 at 10:24:12       [Reply]  [No Email]
Thanks for your past input, as you can tell I have a lot going through my head. I would like to hear from anyone with input on this.

Al- would your hot water heater create enough hot water for a water-air exchanger on your furnace? I noticed your regular furnace is next to your wood burner.

deadcarp- what type of heat exchanger do you use? What water (fluid) temp does your system run? I followed a link on your picture for a company selling exchanger but they did not have the water-air. Most boiler and outdoor furnace companies have them so I should be able to get one.

My thought is if I could run a water-air exchanger off my wood burner (I have one like Als') I would get more out of the unit. I could then send the hot air off the wood furnace to the top floor and heat the house more effeciently.

Al    Posted 02-18-2004 at 16:47:10       [Reply]  [No Email]
Your trying to do something different than what I'm doing . So your guess is as good as mine .
I put two 18" pipes connected with a 3" nip and it over heated the forty gal hot water heater that I'm feeding for domestic water. So I took out the 18" ones and put in 10' pipes and now it doesn't keep up but I like that better . I run out of hot water on that tank if We take a couple baths and do dishes .
I like what Deadcarp is doing but he has a different set up too .
To answer your question I don't think my set up would put alot of heat in a radiator in you duct work . You would need more pipe in the wood furnace .Then your asking for trouble on a closed system .Maybe like he has run it in an open tank and take it from there you could run a pump with an aquastat so when the water got hot enough it would circulate in the radiator and have the fan come on at the same time .
Just be safe

deadcarp    Posted 02-18-2004 at 11:04:44       [Reply]  [No Email]
i don't really use an exchanger unless you call a big copper coil that. then of course my domestic hot water tank is another 30 gals of insulated hot water in the loop. the little radiators are nice - my cousin has one in his forced air plenum and it heats his house from an outdoor boiler. starting your own system you have a coupla handy choices - yep you could use a radiator to collect heat from air.(they're at fleet supply places starting about $150)

or let's say your stove has a flat top. if that's the case, you could take the insulation off, lay like a 60-foot 3/4" copper coil on the stovetop, plumb it in (with a popoff valve or overflow - you don't ever want even the least bit of trapped steam - that stuff's nasty & relentless) throw an insulating blanket over that and you'd eliminate a few concerns.
first you'd have bigger pipes so less chance of blockage, secondly you'd have thicker pipes so less chance of leaks, third you'd have more than twice the surface of a radiator to absorb the heat. and the whole object here is to gather heat from the stove's air, move it and use it elsewhere.

(forgive my enthusiasm i like inventions :) anyway, i had long radiators leftover from teardown so re-installed them here. generally the stove keeps the water around 120-150 f but in cold weather or on a cold evening i try to top out about 180 f. keeps it warmer overnite and lets me sleep in. another 100 gals of hot water would give me 2-3 extra hours of sleep too. :)

deadcarp-oops    Posted 02-18-2004 at 11:19:29       [Reply]  [No Email]
meant to mention - one of your biggest headaches will probably be to tap heat from your stove without overheating the water & boiling the pipes over. in an open pipe, it'll just gurgle and spritz. but if the system's closed or plugged or something's shut, it'll build steam pressure in an awful hurry so keep it open. what i'd suggest is to consider your options, then add the unit to the stove and just leave the pipe ends open for the first firing. (maybe circulate the hot water thru a barrel so the heat has someplace to hide without scaring you to death) anyway, slap together some zero-pressure system with an open pipe even if it just goes outside - then if it gets too hot, you have access and lotsa time to add cold water, close drafts and cool it down while it harmlessly steams up the neighborhood.

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