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EFFECTS OF BURN RATE, WOOD SPECIES, MOISTURE CONTENT AND WEIGHT OF WOOD LOADED ON WOODSTOVE EMISSIONS
Leese, K. E. AND S. M. Harkins. EFFECTS OF BURN RATE, WOOD SPECIES, MOISTURE CONTENT AND WEIGHT OF WOOD LOADED ON WOODSTOVE EMISSIONS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/2-89/025 (NTIS PB89-196828), 1989.
The report gives results of tests of four woodstove operating parameters (burn rate, wood moisture, wood load, and wood species) at two levels each using a half factorial experimental test design to determine statistically significant effects on the emission components CO, CO2, particulate matter, total extractable organics (TEOs), polycyclic aromatic hydrocarbons (PAHs), Cl-C7 hydrocarbons, metals, and the Ames plate incorporation bioassay mutagenic potential. Results showed that increasing burn rate lowered CO, particulate matter, TEO, and Cl-C7 hydrocarbon emission rates. Increasing burn rate raised emission rates of individual PAHs and several metals, and also the mutagenic potential of the emissions. All of these effects were significant at the 90% or better confidence interval. At the 90% or better confidence interval, reducing wood moisture increased the particulate emission factor, while concentrations of several PAHs in the stack gas were lowered. Changing from pine to oak increased K emissions at the 90% confidence interval. Effects just under the 90% confidence interval included reductions in emission factors for several PAHs and a decrease in mutagenic activity. Increasing the weight of the initial wood load increased particulate emissions, significant at the 90% confidence interval. A decrease in mutagenic activity was significant at just below 90%.