On Aug 9, 10:20*pm, Adam Aglionby wrote:
On Aug 9, 12:11*am, Grimly Curmudgeon
wrote:



We were somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember Adam Aglionby
saying something like:

Was hoping that there was some numbers in BTU or whatever on output of
a single open hearth fire with old style back boiler so could do rough
comparison with typical size of gas boiler that would be employed to
heat a 3 bedroom house.

Better late than never, here's an installation leaflet for a Grant back
boiler - pay particular attention to the bottom of page 4 for the info
you seek.

http://www.freeimagehosting.net/uploads/009a695789.jpg

http://www.freeimagehosting.net/uploads/c47d273fb0.jpg

http://www.freeimagehosting.net/uploads/5502af56d8.jpg

http://www.freeimagehosting.net/uploads/f28d531a4e.jpg
--
Dave
GS850x2 XS650 SE6a

"It's a moron working with power tools.
*How much more suspenseful can you get?"
*- House

Much appreciated Dave , thanks.

Suprising numbers your kindly provided data giving 10kW of heat at
just over 2Kg burn per hour of coal.

Using whole house boiler guestimator at:

http://www.energysavingtrust.org.uk/...lculators/boil...

Gives 10kW as about right size for 3 bed semi. Darn, dosen`t tally
with experience but can see how it was sold to Housing Asosciation as
viable plan.

Thanks again.
Adam

Thought there was something optimistic in the numbers.
The Queen Star fire must be approaching 100% efficiency doing much
better than a coal fired pwer station with fluidised bed furnaces,
according to that bastion of accuracy Wikipedia:

http://en.wikipedia.org/wiki/Coal

he energy density of coal is 6.67 kW·h/kg Of the 6.67 kW·h of energy
per kilogram of coal, about 30% of that can successfully be turned
into electricity—the rest is waste heat. Coal power plants obtain
approximately 2.0 kW·h per kg of burned coal.

Even as a water boiler/air heater the Queen Star claims 11.9kW/H at
2.12Kg/h of coal , should have a line of Queen Stars at Drax :-)

Hmmm, so can see how the numbers could have been made to seem
convincing though like CFL output they never quite measure up.
Cheers.
Adam