Tests of the Anthratube Page: 1
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At the request of several Federal agencies, tests were conducted on a
relatively recent type of anthracite-burning equipment named the Anthratube.
This device, rated at 130,000 B.t.u. per hour, was designed to burn Pea-size
anthracite automatically for steam or hot-water house heating and for domes-
tic hot-water supply.
The helpful cooperation of the Anthracite Institute and the manufac-
turers of the equipment, Axeman-Anderson Co., Williamsport, Pa., is grate-
SUMMARY AND CONCLUSIONS
An Anthratube was installed in a nine-room, three-story house and tested
for supplying hot water for house heating and for domestic use under regular
house-service operating conditions for both winter and summer. The equipment
operated under complete automatic control, the coal being fed from a storage
bin and the ashes deposited into a container.
Although the equipment was designed to burn Pea-size anthracite, it was
tested not only for Pea-size but also for Buckwheat- (No. 1) size anthracite.
To burn Buckwheat size satisfactorily, it was found necessary to admit
more air over the fire by means of an air opening drilled in the cover of
the fuel-bed inspection tube.
The exact B.t.u. -per-hour capacity of the Anthratube depends not only
upon the size and characteristics, particularly the volatile and the ash
content of the coal used, but also upon the fan speed and the grate setting
chosen. An approximate method of determination, with the fan speed and grate
setting used for winter operation, showed a B.t.u.-per-hour production of
useful heat of 123,000 with Pea coal and about 113,000 with Buckwheat coal.
However, this could have been increased or decreased substantially to values
above or below the 130,000 B.t.u. as rated by the manufacturer by varying
the fan speed. The values also give the heat per hour that could be put
into domestic hot water with no heat for house heating. The coal-burning
rates were about 11.5 pounds per hour for Pea and about 10.6 pounds per
hour for Buckwheat.
The efficiency of the Anthratube - or its ability to make the heat in
the fuel useful - when continuously running was found to be about 81.6 per-
cent for Pea coal and about 84.0 percent for Buckwheat. If the heat radiated
from the boiler and connecting piping is useful, these efficiencies would
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Barkley, J. F.; Burdick, L. R. & Morgan, R. E. Tests of the Anthratube, report, January 1953; [Pittsburgh, Philadelphia]. (digital.library.unt.edu/ark:/67531/metadc38592/m1/7/: accessed January 22, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.