Posted by Raven on Monday, August 2, 2010 at 3:40am.
(a) CO2 emissions C from a nation’s energy system can be expressed as:
C = Population x Energy consumption per person x CO2 emissions per unit of energy consumption.
Initially, total emissions are 600 million tonnes of CO2 per year. If, over a 50year period, population doubles, energy consumption per person is reduced by 30% by means of energy efficiency and CO2 emissions per unit of energy consumption are reduced by 20% by renewable energy, what is C at the end of the 50year period?
[Hint: If you try to guess the answer, you will be wrong. It may help to write out the equation in algebraic symbols.]
(b) (i) Jim and Jane’s house has a rooftop solar photovoltaic system with conversion efficiency 20% and surface area of collectors equal to 16 m2. It generates its rated power of 2 kW at noon on a clear day in summer. A neighbour decides to install a photovoltaic system with the same power generation. However, the neighbour chooses a cheaper system with conversion efficiency only 10%. Assuming that both roofs face the same direction, what surface area of collectors will the neighbour need?
(ii) Over a period of 12 months, Jim and Jane’s PV system generates 2.628 MWh of electricity. What is its capacity factor for the year?

Physics  bobpursley, Monday, August 2, 2010 at 9:29am
a) Consider per person C consumption.
C=K (.7)(.8) so a .56 factor per person
But population doubles, so 1.12 increase, or a 12 percent increase in emissions.
b. Let I be the energy density coming in.
Jim has .2I to generate 2Kwatts
Neighbor gets .1I, to get 2Kw her will need 2*16m^2
Answer This Question
Related Questions
 college algebra  Are total emissions or percapita emissions a better gauge ...
 statistics  Burning fuels in power plants or motor vehicles emit carbon dioxide...
 college algebra  Country CO2 Emissions (tons of carbon dioxide) 2012 population...
 Climate Change  In a Business 'As usual senario,' global CO2 emissions reach 64...
 Science  What factors might cause my contribution of carbon dioxide emissions ...
 Chemistry  Stelco has been recently legislated to reduce total SO2 emissions ...
 statistics  The makers of the MAGNETIZER Engine Energizer System (EES) claim ...
 chem help  the primary visible emissions from mercury are 404.7 nm and 435.8 nm...
 science  A sedentary person requires about 6 million J of energy per day. This ...
 ECONOMICS PLEASE PLEASE HELP!!  Lots of folks these days believe that CO2 ...
More Related Questions