4-30. a building has a heat loss of 100 mbtu/hr at design
conditions at the geographical location where you re-
side. calculate fuel consumed over the heating season
at the geographical location where you reside. base
your analysis on the following fuels and efficiencies:
a. natural gas (80% efficiency)
b. natural gas (92% efficiency)
c. liquid petroleum gas/propane (80% efficiency)
d. fuel oil number 2 (78% efficiency)
e. electricity, resistance heating (100% efficiency)
f. wood (pine) (50% efficiency)
a
g. coal (60% efficiency)
di 90