Essam Eldin Khalil Hassan Khalil is an Egyptian Mechanical Engineer. Khalil is a professor in the mechanical power department at Cairo University. He is the author and co-author of several international researches in HVAC field. He has many years of experience in delivering courses in air-conditioning to University, college students, to building managers and maintenance staff in both the industrial and commercial sectors in Egypt, the Arabian countries and worldwide. He has been selected by various universities and international organisations to lecture to graduate and post graduate level engineers, managers, supervisors and operating personnel on the subjects of HVAC design and optimisation, HVAC system management, energy utilization, waste heat recovery, plant management and other related subjects.