# Unit Conversions

1.  Using the energy consumption values from the two "greenhouse gas
    emissions and energy consumption" tables (from Part I and Part II of
    the "Getting Started" lesson) and the two worksheets provided,
    calculate the total energy use of the house in common units
    (millions of BTUs/year) for the results in Parts I and Part II.
    Calculate total carbon dioxide (CO2) emissions from the house for
    the results in Parts I and II. Show how the units should be
    cancelled in the formulas.

2.  Based on your results from the Worksheets in the previous question,
    do the carbon dioxide emissions found in Parts I and II decline from
    the results by the same percentage as the total energy use? If not,
    why would this be?

3.  Do the emissions calculated on the worksheets agree with those on
    from the Home Energy Saver? (Yes/No). If not, why might this be?

**Energy Unit Conversions Worksheet: [A]{.underline}**

Complete this worksheet with the information found in **Part I** (base
home), showing how the units cancel to yield the proper final units.
[Note]{.underline}: The home you are modeling will probably not have all
four types of energy shown below! Just skip the ones that are not
relevant.

1\. Convert raw energy to common units (millions of BTUs, MBTU):

a\. \_\_\_\_\_\_\_\_\_kWh x 3413 BTU/kWh x 1 MBTU/1,000,000 BTU\
\
= \_\_\_\_\_\_\_\_\_\_\_\_\_\_\<fill in value and units\> of electricity

b\. \_\_\_\_\_\_\_\_\_Therms x 100,000 BTU/therm x 1 MBTU/1,000,000 BTU\
\
= \_\_\_\_\_\_\_\_\_\_\_\_\_\_\<fill in value and units\> of natural gas

c\. \_\_\_\_\_\_\_\_\_Gallons Oil x 138,095 BTU/gallon x 1
MBTU/1,000,000 BTU\
\
= \_\_\_\_\_\_\_\_\_\_\_\_\_\_\<fill in value and units\> of heating oil

d\. \_\_\_\_\_\_\_\_\_ Gallons LPG x 95,500 BTUs/gallon x 1
MBTU/1,000,000 BTU\
\
= \_\_\_\_\_\_\_\_\_\_\_\_\_\_\<fill in value and units\> of heating oil

e \_\_\_\_\_\_\_\_\_ combine the preceding results to get total energy
from all sources

2\. Convert MBTU of energy to greenhouse-gas emissions (pounds of carbon
dioxide, CO2)

a\. 1.2 lbs CO2/kWh x 1 kWh/0.003413 MBTU x \_\_\_\_\_\_ MBTU of
electricity\
\
= \_\_\_\_\_\_\_\_\_\_ \<fill in value and units\> CO~2~ from
electricity

b\. 12 lbs CO2/therm x 1 therm/0.1 MBTU x \_\_\_\_\_\_ MBTU of natural
gas\
\
= \_\_\_\_\_\_\_\_\_\_ \<fill in value and units\> CO~2~from natural gas

c\. 22.384 lbs CO2/gallon oil x 1 gallon/0.138095 MBTU x \_\_\_\_\_\_
MBTU of heating oil\
\
= \_\_\_\_\_\_\_\_\_\_ \<fill in value and units\> CO~2~from heating oil

d\. 12.805 lbs CO2/gallon LPG x 1 gallon/0.0955 MBTU x \_\_\_\_\_\_ MBTU
of LPG\
\
= \_\_\_\_\_\_\_\_\_\_ \<fill in value and units\> CO~2~from LPG\
\
e. \_\_\_\_\_\_\_\_\_\_\_\_\_ Combine the preceding results to get total
CO2 from all sources of energy

**Energy Unit Conversions Worksheet: [B]{.underline}**

Complete this worksheet with the information found in **Part II**
(efficient home). Show how the units cancel to yield the proper final
results. [Note]{.underline}: The home you are modeling will probably not
have all four types of energy shown below! Just skip the ones that are
not relevant.

1\. Convert raw energy to common units (millions of BTUs, MBTU):

a\. \_\_\_\_\_\_\_\_\_kWh x 3413 BTU/kWh x 1 MBTU/1,000,000 BTU\
\
= \_\_\_\_\_\_\_\_\_\_\_\_\_\_\<fill in value and units\> of electricity

b\. \_\_\_\_\_\_\_\_\_Therms x 100,000 BTU/therm x 1 MBTU/1,000,000 BTU\
\
= \_\_\_\_\_\_\_\_\_\_\_\_\_\_\<fill in value and units\> of natural gas

c\. \_\_\_\_\_\_\_\_\_Gallons Oil x 138,095 BTU/gallon x 1
MBTU/1,000,000 BTU\
\
= \_\_\_\_\_\_\_\_\_\_\_\_\_\_\<fill in value and units\> of heating oil

d\. \_\_\_\_\_\_\_\_\_ Gallons LPG x 95,500 BTUs/gallon x 1
MBTU/1,000,000 BTU\
\
= \_\_\_\_\_\_\_\_\_\_\_\_\_\_\<fill in value and units\> of heating oil

e \_\_\_\_\_\_\_\_\_ combine the preceding results to get total energy
from all sources

2\. Convert MBTU of energy to greenhouse-gas emissions (pounds of carbon
dioxide, CO2)

a\. 1.2 lbs CO2/kWh x 1 kWh/0.003413 MBTU x \_\_\_\_\_\_ MBTU of
electricity\
\
= \_\_\_\_\_\_\_\_\_\_ \<fill in value and units\> CO~2~ from
electricity

b\. 12 lbs CO2/therm x 1 therm/0.1 MBTU x \_\_\_\_\_\_ MBTU of natural
gas\
\
= \_\_\_\_\_\_\_\_\_\_ \<fill in value and units\> CO~2~from natural gas

c\. 22.384 lbs CO2/gallon oil x 1 gallon/0.138095 MBTU x \_\_\_\_\_\_
MBTU of heating oil\
\
= \_\_\_\_\_\_\_\_\_\_ \<fill in value and units\> CO~2~from heating oil

d\. 12.805 lbs CO2/gallon LPG x 1 gallon/0.0955 MBTU x \_\_\_\_\_\_ MBTU
of LPG\
\
= \_\_\_\_\_\_\_\_\_\_ \<fill in value and units\> CO~2~from LPG\
\
e. \_\_\_\_\_\_\_\_\_\_\_\_\_ Combine the preceding results to get total
CO2 from all sources of energy