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Unit Conversions
Angelique Luedeker, ITEP
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Unit Conversions and TEISS
TEISS does some of the math for you
Emission Factor (EF) x Activity Data = Emissions
TEISS provides EFYou provide activity data
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Emission Factors
EF is basically a conversion factor
ExamplesLbs of PM10 emitted/ton of wood burned
Lbs of PM2.5 emitted/vehicle mile traveled
Lbs of mercury emitted/ton of coal burnedExample0.5 lbs CO x 10,000 tons coal = 5,000 lbs CO
1 ton coal
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Unit Converter in TEISSTEISS has unit conversion tool
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TEISS Unit Conversion Tool
Area is selected, shows list of area units
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TEISS Unit Conversion Tool
Mass is selected, shows list of mass units
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TEISS Unit Conversion
See handout and practice using Unit Conversion Tool
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Energy Unit Conversion
Converting energy units often requires knowing energy density of a given material
Energy density can vary within material
TEISS Unit Conversion Tool cannot convert energy to other unit categories, such as volume
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Energy Density
ExamplesNatural gas from different sources provides differing amounts of energy
High-heating value gas has 1027 BTUs/ft3
Low-heating value gas has 930 BTUs/ft3
Most gas is somewhere in-betweenDifferent kinds of wood provide different amounts of heat when burned
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Energy Density Defaults
What if you don’t know energy density of your reservation’s natural gas or wood?– Use defaults
• For natural gas, EPA’s AP-42 gives 1020 BTUs/ft3
• For wood, TEISS provides a converter within the wood-burning calculators– Allows you to enter volume of wood (cords) and
specify wood type– Then it calculates tons of wood per cord
required to do calculation
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Energy Unit Exercise
• See handout and work through 2 questions related to energy density