HW_2++Solutions

HW_2++Solutions - ECE4001 HW#2 Solutions Problem 1. Fall...

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Unformatted text preview: ECE4001 HW#2 Solutions Problem 1. Fall 2009 The average American generates 20 metric tons [1] of carbon dioxide (CO2) every year from personal transportation, home energy use and from the energy used to produce all the of the products and services we consume. One can use an online carbon footprint calculator to get a gist of how much CO2 they are producing annually for their specific lifestyle. Some suggested carbon footprint calculators are listed below. http://www.carbonify.com/carbon‐calculator.htm http://www.epa.gov/climatechange/emissions/ind_calculator.html http://www.bp.com/productlanding.do?categoryId=6928&contentId=7045314 Problem 2. The average CO2 generation annually for the following transportation sources: Auto1,2 – 6.6 tons of CO2 emissions annually Public transportation – “an individual switches a 20‐mile round‐trip commute to public transportation his or her annual CO2 emissions will fall by 4,800 pounds per year, equal to a 10 percent reduction in a two‐car household’s carbon footprint [3].” Air travel3,4 – 6.1 tons of CO2 emissions annually Problem 3. There are a number of sources that provide alternative CO2 emissions which include, but are not limited to: ‐ Your diet can be a major source of CO2 production. This is attributed to the resources needed to produce and transport the food you consume. Refuse/garbage from individuals. This can amount to 1010 lbs of CO2 emissions per person annually. ‐ Problem 4. 1. Assuming average/medium car with 21 mpg fuel economy. 2. Assuming the average car drives 12,000 miles annually or 1,000 miles per month. 3. Air travel emissions based on Boeing 747 at average USA capacity and calculated per person. 4. The average American is assumed to travel 1055 miles/year in an airplane. The carbon footprint calculator on www.carbonify.com assumes that “5 trees should be planted to ensure that at least one lives to 40 years or that their combined sequestration equals 1 ton.” Thus, for a total annual CO2 emissions of 6.6 tons, (6.6 tons)(5 trees/1 ton of CO2) = 33 trees are needed annually to offset 6.6 tons of CO2 emissions. Problem 5. Besides planting trees, CO2 emissions can be neutralized by a variety of ways. These include but are not limited to: 1. Carbon sequestering technologies show great promise to neutralize CO2 emissions. 2. CO2 can be absorbed in the world’s oceans. 3. Reducing activities that lead to the production of CO2 of carbon emissions, such as eating less meat and dairy products which have been linked to high CO2 levels. Another example includes the riding public transportation or car pooling to reduce CO2 emissions. References [1] Massachusetts Institute of Technology (2008, April 29). Carbon Footprint Of Best Conserving Americans Is Still Double Global Average. ScienceDaily. Retrieved February 16, 2009, from http://www.sciencedaily.com/releases/2008/04/080428120658.htm [2] http://www.carbonify.com/carbon‐calculator.htm [3] http://www.apta.com/media/facts.cfm 1. Assuming average/medium car with 21 mpg fuel economy. 2. Assuming the average car drives 12,000 miles annually or 1,000 miles per month. 3. Air travel emissions based on Boeing 747 at average USA capacity and calculated per person. 4. The average American is assumed to travel 1055 miles/year in an airplane. ...
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This note was uploaded on 02/08/2011 for the course ECE 4001 taught by Professor Frazier during the Fall '09 term at Georgia Tech.

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