CIE49 Proceedings, October 18-21, 2019, Beihang University AN IMPROVED EXACT SOLUTION FOR THE POLLUTION ROUTING PROBLEM WITH PROPULSION AND REFRIGERATION ENERGY CONSIDERATION Lamis E. Amer 1 , Noha A. Mostafa 2, , Amr B. Eltawil 3 1 Department of Industrial Engineering and Systems Management Egypt-Japan University of Science and Technology, New Borg Elarab, Egypt Lamis.essam@ejust.edu.eg mailto:14581264@sun.ac.za 2 Department of Industrial Engineering Zagazig University, Zagazig, Egypt namostafa@eng.zu.edu.eg 3 Department of Industrial Engineering and Systems Management Egypt-Japan University of Science and Technology, New Borg Elarab, Egypt eltawil@ejust.edu.eg ABSTRACT The pollution routing problem is a ‘Green logistics’ practice that extends the classical vehicle routing problem to consider sustainable logistics issues. To do so, wider objectives are included; which naturally leads to more complex combinatorial optimization problems. This paper introduces a new mathematical model to solve the routing problem of a fleet of reefers that extends the typical model by considering the energy consumption of the refrigeration unit. The results illustrate that considering the effect of refrigeration as a new variant of the routing problem can achieve between 3.8% to 11.1% energy saving. Keywords: Transportation logistics, Supply Logistics, Control and optimization of supply chains, Sustainability, Pollution routing problem, Cold supply chains    Corresponding author   1