Development of GHG Emission Factor for Passenger Vehicles by Fuel Type and Size Class Using Statistical Analysis Method
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ght © 2020 KSAE/ 11722 pISSN 12299138/ eISSN 19763832
DEVELOPMENT OF GHG EMISSION FACTOR FOR PASSENGER VEHICLES BY FUEL TYPE AND SIZE CLASS USING STATISTICAL ANALYSIS METHOD Dojeung Ryu1, 2), Charyung Kim2) and Shibok Lee1)* School of Mechanical Engineering, Busan National University, Busan 46241, Korea Office of EFV Research, Korea Automobile Testing & Research Institute, 200 Samjon-ro, Hwaseong-si, Gyeonggi 18247, Korea 1)
2)
(Received 30 September 2019; Revised 11 October 2019; Accepted 11 October 2019) ABSTRACTIn order to build and efficiently implement a policy to reduce greenhouse gas (GHG) emissions, a Tier-3 level emission factor is necessary. The GHG emission factor for the passenger vehicle segment was developed by the Korean Ministry of Environment up to 2009, after which the Korean Ministry of Land, Infrastructure and Transport has been conducting the task. This study aims to develop a Tier-3 level GHG emission factor reflecting the emission trends of passenger vehicles by fuel type and size class from 2010 to 2018. To secure the reliability of the newly developed Tier-3 GHG emission factor, all testing results were obtained through statistical analysis, and the final regression model was selected through a comparison of a coefficient of determination (R2). A review of the measurement uncertainty was conducted in order to examine the accuracy of the test results. The new Tier-3 emission factor developed through this study will be used for calculating national GHG emissions as well as establishing policies for the issue. KEY WORDS : Green house gas, Emission factor, Chassis dynamometer, Driving cycle, Uncertainty
1. INTRODUCTION
sector was set at 25.9 million tons which is a 24.6 percent reduction from BAU. However, in the revised roadmap for the national GHG reduction in 2018, the reduction volume for the transportation sector increased to 30.8 million tons (29.3 percent reduction from BAU) (Ministry of Environment, 2018a). Thus, a response system is required to handle the GHG reduction in the transportation sector. Approximately 95 percent of GHG emissions in the transportation sector is released by automobiles on roads. This means that a Tier-3 level GHG emission factor for roads which reflects the domestic attributes and circumstances must be developed in order to establish and efficiently implement a sustainable policy for transportation and logistics such as setting up GHG reduction goals or researching and evaluating sustainability (Ministry of Environment, 2018b). The GHG emission factor of vehicles on domestic roads is annually determined through the national institute of environmental research (NIER) mode which embodies the driving conditions of low, medium and high speeds as well as the highway. Past studies have shown that the emission of CO2 in particular while driving on the road fluctuates significantly according to the amount of traffic, fuel type, idling and time spent waiting on traffic signals among other factors (Jung et al., 2017; Myung et al., 2014; Lee et al., 2019). Meanwhi
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