Summary SECTION
7.1 RESIDENTIAL
WOOD COMBUSTION (This
page last updated on October 12, 2015) Emission Inventory Source Category: Miscellaneous Processes / Residential Fuel Consumption / Residential Wood Combustion
Method Summary: This methodology is used to estimate criteria
pollutant emissions from fireplaces and wood stoves (which includes fireplace
inserts and pellet stoves). The calculation method utilizes firewood
consumption estimates from local and national surveys and updated emission
factors from the U.S. EPA National Emission Inventory and other studies. Changes in Methodology: The 1997 version of this methodology estimated
emissions from burning cord wood in fireplaces and wood stoves based on
1993 activity data for SJV and 1991 for the remainder of the state. This
revised methodology provides emission estimates for cord wood, bundle wood,
artificial/manufactured wax/sawdust logs, compressed sawdust logs, and pellets,
based on 2005 activity data for all regions in the state. In addition, the
types of devices now include fireplaces, wood stoves, fireplace inserts, and
pellet stoves. Activity Data Source: Firewood
consumption estimates by county were developed using one of two approaches. The preferred
method, which relies on local surveys of firewood usage, was used primarily
for areas in Northern and Central California where residential wood combustion
is more prevalent. An alternative method, which uses U.S. Census Bureau
data, was employed for areas where local survey data was not available. Emission Factor Source: Default values for emission factors
were updated to reflect data used by U.S. EPA to develop the 2002 National
Emission Inventory and information from other wood combustion studies. Temporal Data: ARB staff developed a default temporal
profile that assumes that most residential wood burning occurs during the cold
season (from early fall to mid-spring).
However, several districts have submitted temporal profiles for their
region that differ from the ARB default. Growth Parameter: Default growth parameters for fireplace and
woodstove emissions are based on historical residential wood combustion survey
data and residential wood burning forecasts from the U.S. Energy Information
Agency. However, some districts
have submitted alternative growth data based on local information and updated
rules that limit growth of wood-burning appliances. Date of Last Update: July 2011 2005 Statewide Emissions
Summary
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