Are BTU figures mainly a bunch of lies?

Re: Are BTU figures mainly a bunch of lies?

PostBy: mdrelyea On: Mon Nov 19, 2012 9:21 pm

franco b wrote:You also need commensurate heat exchange surface which these stoves don't have


You know, that's been on my mind lately. What about fins to increase the surface area? Are there stoves out there that have fins? For example, on my Alaska, the top of the firebox is right at the bottom of the plenum. It's just flat metal. What if it were covered in some sort of fins like an air cooled engine or a heatsink on a computer's processor? That would greatly increase the heat exchange surface area. While we're covering the outside, let's not forget about inside the firebox too.

Am I all wet? Has this idea been thought of before?

Mike
mdrelyea
 
Hot Air Coal Stoker Furnace: Alaska 140 Auger
Hand Fed Coal Stove: Russo #2
Coal Size/Type: Anthracite Rice/Nut

Re: Are BTU figures mainly a bunch of lies?

PostBy: franco b On: Mon Nov 19, 2012 9:35 pm

Anything to increase the surface area is effective. When finned copper was used in tankless coils it was 3 times as effective over smooth.

Most modern boilers have narrow flue passages with either fins or studs cast in. Rough cast iron has greater surface area than smooth and is a more effective heat exchanger.

There was a post where aluminum fins were used on the sides of a stove with good results.
franco b
 
Hand Fed Coal Stove: V ermont Castings 2310, Franco Belge 262
Baseburners & Antiques: Glenwood Modern Oak 114
Coal Size/Type: nut and pea

Re: Are BTU figures mainly a bunch of lies?

PostBy: gizmo On: Mon Nov 19, 2012 9:38 pm

The one thing I learned about btu,s is,If you don't have enough,you
will be cold.
gizmo
 
Stoker Coal Boiler: AA-130
Coal Size/Type: Anthracite/Pea
Other Heating: NONE

Visit Lehigh Anthracite

Re: Are BTU figures mainly a bunch of lies?

PostBy: franco b On: Mon Nov 19, 2012 9:52 pm

Flyer5 wrote:
franco b wrote:
As for boilers, if it does not have an IBR rating I would not trust it.



Why?

Years ago the problem was recognized that it was impossible to design a heating system unless boiler output figures could be relied on. The trade set up the Institute of Boiler and Radiator Manufacturers (IBR) to make standards for ratings. Now everybody could work to the same standard.

If there were standards for coal stoves you would not have such absurdities as a Vogelsang pot belly rated at 200,000 BtU.
franco b
 
Hand Fed Coal Stove: V ermont Castings 2310, Franco Belge 262
Baseburners & Antiques: Glenwood Modern Oak 114
Coal Size/Type: nut and pea

Re: Are BTU figures mainly a bunch of lies?

PostBy: steamup On: Tue Nov 20, 2012 11:38 am

Understand hand fired equipment is usually rated at peak fire. You cannot maintain peak fire in a hand fired piece of equipment without babysitting it. When you load it, the output is dimished until the fuel catches fire and then as the pile burns down, the output goes down.

Generally you have to oversize the hand fired equipment to compensate for the output curve. 15 to 20 percent minimum up to 35% oversizing is not uncommon.

Stoker equipment can maintain a more constant fire on demand.

The IBR system rates only liquid and gaseus fuel boilers.
steamup
 
Stoker Coal Boiler: Axeman-Anderson AA-130, Keystoker K-6
Hand Fed Coal Boiler: HS Tarm 502 Wood/Coal/Oil
Coal Size/Type: pea, buck, rice

Re: Are BTU figures mainly a bunch of lies?

PostBy: Flyer5 On: Tue Nov 20, 2012 11:42 am

gizmo wrote:The one thing I learned about btu,s is,If you don't have enough,you
will be cold.



ROFLMAO. Thanks :D
Flyer5
 
Stoker Coal Boiler: Leisure Line WL110
Hot Air Coal Stoker Stove: Leisure Line Pioneer

Visit Lehigh Anthracite