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 50-year 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 50-year 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

- statistics - Burning fuels in power plants or motor vehicles emit carbon dioxide...
- Science - What factors might cause my contribution of carbon dioxide emissions ...
- Climate Change - In a Business 'As usual senario,' global CO2 emissions reach 64...
- chem help - the primary visible emissions from mercury are 404.7 nm and 435.8 nm...
- Chemistry - Stelco has been recently legislated to reduce total SO2 emissions ...
- statistics - The makers of the MAGNETIZER Engine Energizer System (EES) claim ...
- chemistry - you are hired as an environmental consultant at Stelco Inc., one of ...
- statistics - Miller (2008) examined the energy drink consumption of college ...
- ECONOMICS PLEASE PLEASE HELP!! - Lots of folks these days believe that CO2 ...
- Econ - help please - demand for sulfur dioxide by coal-fired electricity ...