Project_Data_DEFRA_Model_for_Car_Emissions

Project_Data_DEFRA_Model_for_Car_Emissions - Explanation

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Explanation This is the Official DEFRA Interactive Model Factors developed by AEA and agreed with Department for Transport These other outputs are available in the Factors sheet Two versions of the model are available using SMMT car Categories or Engine Size Categories Inputs and Main Results are in 'Fleet Assessment' These factors are estimated average values for the UK car fleet in 2009 travelling on average trips in the UK. They are calculated based on  data from SMMT on new car CO2 emissions from 1998 to 2010 combined with factors from TRL as functions of average speed of vehicle  derived from test data under real world testing cycles and an uplift of 15% agreed with DfT to take into account further real-world driving effects  on emissions relative to test-cycle based data.  Further work is ongoing to understand this uplift in more detail and revise it if necessary in the  future. Real world effects not covered in regular test cycles include use of accessories (air conditioning, lights, heaters, etc), vehicle payload (only  driver +25kg is considered in tests, no passengers or further luggage), poor maintenance (tyre under inflation, maladjusted tracking, etc),  gradients (tests effectively assume a level road), weather, harsher driving style, etc. More accurate calculation of emissions can be made using the actual fuel consumed, where available.  Alternatively if a figure for a specific  car's fuel consumption (e.g. in miles per gallon, mpg) is known, then the CO2 can be calculated from the total mileage. The main output shown under Fleet Assessment is the total metric tonnes of direct CO2 equivalent i.e. including other gases that convert to 
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This note was uploaded on 10/24/2011 for the course ECONOMICS 30112 taught by Professor Ahfdka during the Spring '11 term at Coventry.

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Project_Data_DEFRA_Model_for_Car_Emissions - Explanation

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