About Browse this Partner. What Descriptive information to help identify this report. Source Other Information: Portions are illegible in microfiche products. Language English. Item Type Report. Identifier Unique identifying numbers for this report in the Digital Library or other systems.
Other : DE Report No. Collections This report is part of the following collection of related materials. About Browse this Collection. Digital Files 39 image files available in multiple sizes 1 file. When Dates and time periods associated with this report. Dates This report's creation, acceptance, or submission date is unknown. Description Last Updated Feb. Usage Statistics When was this report last used? Yesterday: 0. Past 30 days: Total Uses: In summary, we designed and constructed a calorimeter room in a building located on the campus of Northern Kentucky University.
We equipped this room with a woodburning stove and a metal chimney extending through the roof. We designed and constructed the appropriate instrumentation for monitoring the heat output of the stove. We observed and recorded the operating characteristics of this stove over a period of several days. We then equipped the stove with a barometric damper and repeated the experiment. We are now in the process of equipping the stove with a catalytic converter. Similar records in OSTI. The bypass valve should also be built to seal tightly.
Any smoke that leaks around it will miss the catalyst and reduce efficiency. If all stoves were the same, we could tell you exactly how to build a bypass valve for yours. As it is, though, there are a lot of differences among existing designs.
That fact demands some ingenuity on the part of retrofit-minded stove owners. First, the stove was run for approximately hours with the package in place. During that time, about pounds of air-dried oak was consumed at a variety of burn rates. Subsequently, the catalysts were removed from their steel jacket, and the heater was operated under the same conditions equal burn rates, time, and wood poundage with the bypass valve closed to move smoke through the empty converter chamber.
By leaving that casing in place, we hoped to find out how much heat the catalyst itself contributed, rather than the sum of the catalyst input and the heat exchange effect produced by its metal jacket. The stove was set in a small, well-insulated room that was equipped with blowers to extract air and a generous inlet to admit air at the ambient temperature in the building.
Our testing methods were quite basic and somewhat limited in scope and accuracy when compared with the sophisticated calorimeter rooms used by some laboratories. Averaging the figures recorded during ten burn cycles which included from one to four fuel loadings each with the catalyst and ten without, we witnessed an efficiency increase of For example, a Because we knew that there would be experimental inaccuracies, we made every effort to err on the conservative side.
While we were recording the efficiency measurements, we also ran a creosote accumulation test. At the beginning of each phase of the study, we installed a new, lower stovepipe connector that had been weighed.
After the phase was completed, we removed the connector and reweighed it to judge the amount of creosote that had built up. This figure is higher than those developed by some stack-mounted catalysts, but is a little lower than those achieved by some well-designed catalyst stoves. Of course, a converter is still no substitute for regular chimney inspection and maintenance.
Once you get the hang of it, operating a stove equipped with catalytic converters is only a little more difficult than managing a heater without them. As soon as the burn is established to the point where you would normally shut down the draft control to get the output you desire, the bypass can be closed slowly. Approximately five minutes after the bypass is closed, depending on the specific stove and the intensity of the blaze inside, the heater can be damped down to achieve the burn rate you need.
Throughout the tests we used a stack temperature thermostat and recommend it highly. The automatic control markedly smooths the temperature curve of the catalysts, eliminating many of the sharp rises and drops in temperature that normally occur in a converter. As a result, catalyst life should be extended when the thermostat is used. During the hours immediately after loading, the catalyst will be very active, handling the volatile hydrocarbons being released from the wood. Later, when the bulk of the burnable combustion waste is carbon monoxide, temperatures will drop, but the catalyst will still be doing its job for almost as long as coals remain in the firebox.
After the charge of wood burns down — but not out — you can open the bypass, add more fuel, and then close the bypass immediately.
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