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43 terms

EGEE 102 Exam 1

STUDY
PLAY
energy
property of matter that can be converted into work, heat or radiation; capacity to do work; can be converted into work, heat, or radiation
energy units
BTU
calories
kWh
joules
power
rate at which work is done; energy(work)/time
country with most energy consumption per capita
USA
country with most affordable energy
Iceland
county with most energy intensity of G7 countries
Canada
(US 2nd)
country with most energy intensity of G8 countries
Russia
which fossil fuel is growing the fastest & is used most to provide energy?
petroleum
which fossil fuel is used the most for electricity generation?
coal
reserves
resources that can be recovered economically with the application of extraction technology available currently or in the foreseeable future
resources
portion of energy known to exist or even suspected to exist irrespective of technical or economic viability
location with most coal reserves
far east & oceania
approx lifetime of coal (world)
270 years
location with almost all crude oil reserves
middle east
approx lifetime of petroleum (world)
40 years
US - less than 10
2 locations with largest reserves
middle east
E. Europe and FSU
approx lifetime of natural gas (world)
60 years
efficiency
USEFUL output / input
boiler components
chemical energy -> boiler -> thermal energy -> turbine -> mech. energy -> generator -> elec. energy output
calculate overall efficiency
just multiply
power units
watt, kW, MW, J/s, J/hr, BTU/s, BTU/hr
renewable energy
can be converted into electricity & heat
meets less than 10% of US energy demand
ex: solar, nuclear fusion, biomass (significantly in the US), wind, tidal
nonrenewable energy
can be converted into electricity & heat
source cannot be regenerated within a reasonable time period
ex: nuclear fission, petroleum, coal, natural gas
energy savings (annual)
annual energy consumption kWh = watts/1000 x hrs x 365=

annual operating cost = kWh x cents / 100
energy savings (month)
energy consumed in month kWh = watts/1000 x hrs x 31
what percentage of the world's energy demand is the US?
20%
incandescent light bulb
lowest energy efficiency; converts approx 5% of electricity into visible light
fossil fuel power plant energy conversion
chemical -> electrical
what has the highest energy efficiency?
generators
what is the form of energy in biomass?
chemical
1 calorie
amount of heat required to raise 1 g of water through 1 degree C
1 BTU
amount of heat required to heat 1 lb of water through 1 degree F
more energy than calorie
what natural resource is the US richest in?
coal - we have almost 25% of worlds coal reserves
over 25% of oil/petroleum products used for...?
transportation
what is the projected increase in renewable energy due to?
large hydroelectric facilities in developing countries like Asia
fuel that supports greatest proportion of primary energy in US
petroleum
which energy sources will increase worldwide?
ALL - oil, nuclear, coal
what percentage of US petroleum demand is met by imports?
50%
fastest growth in energy use -- where?
Asian nations (China, India)
what percentage do heat engines account for our energy conversion devices?
50%
carnot efficiency
maximum efficiency that can be obtained for a heat engine
energy intensity
ECONOMIC GROWTH exceeds ENERGY DEMAND in industrialized countries, and in developing countries they meet
lifetime (of a resource)
RP reserves to production ratio
= reserves / annual use