|
Post by coastalrocketeer on Feb 19, 2019 23:27:36 GMT -8
If you can insulate around that clay chimney pipe with rock wool or fiberglass, it would almost certainly perform better As far as length, I have not ever researched that at all, as it is not commonly used, or available in my area.
|
|
|
Post by DCish on Feb 20, 2019 7:03:13 GMT -8
adding just a few feet of height to a cooler-running chimney produces far more draft than a very high-temperature, short chimney. Consensus has been for some time that a well-insulated chimney at the end of a system with enough heat left over to run it (140-180F, I think the low-end number is) is the source of draft to rely on. makes sense, but a longer chimney requires more heat to stay warm so less heat harvest. Yes, that's why I specified "well-insulated chimney" I don't have experience with clay chimneys, so I can't say for sure. My guess would be that a good rule of thumb for an uninsulated chimney would be to assume it is absorbing heat all along the way in the same way any other masonry surface would be. Thus, if you calculate the ISA of your masonry chimney and reduce the size of your heat harvest by that amount, you would probably have a functioning chimney. Seems pretty wasteful, though, and a good arguement for insulating the chimney if all possible.
|
|