2016 MHA Annual Meeting
Combustion Testing Workshop
MHA Technical Committee,
with special thanks to Carsten Homstead and Boris Kukolj
to Wildacres 2016 Photo Report
Skip to Test Results
is a single
bell, with wraparound heated bench that joins at the remote rear
chimney. There is a bench bypass for cold starts.
is at the bottom of the photo. Heater was a one-off design by Carsten
to provide heated seating for the pizza party, and to demonstrate a low
bell with an Austrian spec eco-labelled firebox.
sits on top of a cast iron bypass damper to bypass the bench for cold
heater did prove a little slow to start when it was fresh. It was very
hard to get a temperature reading much above ambient in the
with the bypass closed. Even at full burn, you could put your hand on
single wall chimney connector pipe.
shows spacer strip with ceramic paper corner gasket. This creates a gap
for the air supply to the horizontal air slots
the firebox. The gasket is an expansion joint, used at the inside
downdraft heat exchange section behind the firebox. The interior bricks
in this "bell" provide extra heat exchange surface.
the cardboard expansion joint at the corner, between the firebrick
heater core and the clay brick facing.
heater needed to go up fast, to get ready for testing. MHA's has some
very seasoned production brick masons
that are ready when needed.
baffle will be just beneath the firebox ceiling. Gases from the firebox
exit towards the front (top of photo).
is designed to be cappable with regular 9" firebricks.
Helicke tools his joints. The mortar is Goldart fireclay and sand.
wrap for heater core.
the firebrick tile ceiling slabs.
the brick section of chimney.
airframe for firebox door.
curing the heater, there was a very large temperature drop in less than
30" of downdraft, on the order of 150 degrees F.
difference became less as the bricks got saturated with heat.
up the brick facing. 1:45 PM
transition to single wall 6" connector pipe.
Alberene Soapstone donated
several large soapstone slabs that were cut up for bench tops and
install into the airframe.
1, 10:00 PM - Lighting the curing fire.
3, 8:00 AM.
has been burning all night. Note some of the lightened mortar joints,
where the bricks are starting to get dry on the outside.
bit more drying can be seen.
on the curing fire.
after the start, the plume from the stack is mostly steam.
very faint residue is visible after the steam evaporates.
out the soapstone slabs for the bench tops and heater cap.
the soapstone bench tops.
drying is evident.
test run. Heater was still warm (390F firebox temperature) from the
overnight curing fire.
first run was very good, considering it was a partially cured heater.
the second run, the combustion air had been left closed overnight,
which allowed moisture to migrate back inwards.
was lots of water in the stack, and the stack temperature was 40
degrees lower. As a result, PM was fairly high for an eco-firebox.
three was good, with extremely low CO, PM under 1 g/kg, and overall
efficiency over 80%. In pellet stove testing Condar efficiency
generally been 1% - 3% lower than calculated B-415 efficiency.
flue gas temp @ heater exit @ peak of burn (lowest O2 point) : 238F
temp : 227F
exit temp @ peak : 178F
morning, a couple of hours after the finish of the pizza party.
was still hot, which makes for a difficult demo later in the morning.
2006 Photo Report
2004 Photo Report
2003 Photo Report
2002 Photo Report
2001 Photo Report
2000 Photo Report
1999 Photo Report
1998 Photo Report
1997 Photo Report
page was last updated on June 6, 2018
This page was created on April 22, 2016