Re: OT--Stack temps in outdoor wood furnace

Posted by BillyinStoughton on October 05, 2006 at 13:20:42 from (69.214.162.13):

In Reply to: OT--Stack temps in outdoor wood furnace posted by wisc dave on October 05, 2006 at 12:40:00:

You are talking about two entirely separate pieces of equipment I'm afraid Dave. A gas fired furnace like what is typical in Wisconsin is going to be of the 90% efficiency type and vented in Schedule 40 PVC. Stack temperatures on a 90% piece of equipment are only going to be in the 110-115 degree range (since they have both a primary and secondary heat exchanger). There are also 80% efficient furnaces in the area (though they are becoming less common). An 80% furnace with a power ventor is gonna have a stack temperature in the neighborhood of 180-190 degrees (you don't want an 80% to vent much cooler than that since it could possibly cause condensate in the metal venting and promote corrosion).

Now down to your outdoor wood boiler. The first thing to note is that the stack temperatures are going to be dictated by the return water temerature. The cooler the temperature coming back, the more temperature differential you have, the more heat transfer is possible. That being said, most solid fuel boilers / furnaces (depending on the type of wood being burned)...you are going to get you in the 600 to 750 degrees range.

Billy

Replies:

• Re: OT--Stack temps in outdoor wood furnace wisc dave 19:44:12 10/05/06 (0)
• Re: OT--Stack temps in outdoor wood furnace wisc dave 19:44:01 10/05/06 (0)

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