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Tutorial 4

Tutorial 4. Travelling Light. TMA 4. Sources and impacts of CO 2 , SO 2 & No x Environmental impacts of steel production Cars Kinetic energy Effect of design on fuel consumption Report on travel ( 60% of marks). Finding Information. Use course glossary / index Be selective. Exercise.

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Tutorial 4

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  1. Tutorial 4 Travelling Light

  2. TMA 4 • Sources and impacts of CO2, SO2 & Nox • Environmental impacts of steel production • Cars • Kinetic energy • Effect of design on fuel consumption • Report on travel (60% of marks)

  3. Finding Information • Use course glossary / index • Be selective

  4. Exercise • What are the environmental impacts of road transport?

  5. Spray Diagram CO2 NOx CO Noise Emissions VOCs Energy Environmental Aspects of Road transport Particulates Ozone Tyres (Rubber) Land use Resources Wastes Manufacture Use Oil Car (Scrap) Oil Rubber Plastic Steel Water / land pollution Other chemicals Other metals

  6. Life Cycle Assessment Use Manufacture Disposal Examines environmental impacts which occur “from cradle to grave”

  7. Life Cycle Assessment - Petrol Extraction of oil Transport of oil Refining Transport Use

  8. Calculation • A car weighs 1600 kg. The driver weighs 80 kg. What is its kinetic energy when driven at 90 km hr –1?

  9. Answer • Kinetic energy = 0.5 m v2 • Where • m = mass (kg) and • v = velocity (m/s) • First convert velocity in km/hr to m/s • Divide by no. of seconds in 1 hour (3600) • Multiply by no. of metres in a km (1000) • So 90 km/hr = 90 x 1000 = 25 m/s 3600

  10. Answer (continued) • Total mass = 1600 kg + 80 kg = 1680 kg • So kinetic energy = 0.5 x 1680 x 25 2 = 525000 J = 5.25 x 105 J, or = 525 kJ

  11. Exercise • I traveled to Chester (80 mile round trip) five times by car. • How much energy did I use? • How much CO2 did I generate?

  12. Answer – Q1 • Total distance travelled was 400 miles • 400 miles = 400 miles x 1.6 km mile-1 =640 km • From Table 3.4 in Theme 2 • Average car consumes 3.5 MJ km-1 • Energy consumed = 640 km x 3.5 MJ km-1 = 2240 MJ

  13. Answer – Q2 • Total distance travelled was 400 miles • 400 miles = 400 miles x 1.6 km mile-1 =640 km • From Table 4.2 in Theme 2 • Average figure for petrol car is 385 gm CO2 km-1 • Energy consumed = 640 km x 385 gm CO2 km-1 = 246400 gm = 246.4 kg (note that this is equivalent to 0.25 tonnes!)

  14. Minimising Our Impact on the Environment • Prevention • Technical measures • Administrative measures

  15. Exercise • What measures can we consider to reduce the environmental impacts of road travel?

  16. Report of Travel • Analyse your travel 14 marks • Assess information collected 8 marks • Develop 5 year plan to reduce your CO2 emissions 25 marks • Discuss the viability of your plan 10 marks 3 marks forpresentation (Total of 60 marks)

  17. Report Writing • See guidance (on web site)

  18. Some tips • Stage 1 • Use table to present data • For energy use see Table 3.4 in Theme 2 • Stage 2 • Identify and explain • Stage 3 • Should be based on your own travel • Option b available if your road travel is minimal

  19. Some tips (continued) • Stage 4 • Pros and cons • Strengths and weaknesses • Who needs to do what

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