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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