**Meet the editor**

Dr. Orhan Ekren is an associate professor at Ege University. He received his MSc degree from the Department of Energy Engineering and PhD degree from the Department of Mechanical Engineering (Thermodynamics). He studied as a postdoc researcher in the Southern Illinois University, USA. His main research interests are energy efficiency, energy saving, capacity modulation

on refrigeration and HVAC&R systems, renewable heating and cooling, magnetic cooling, integration of renewable energy systems into buildings, optimum sizing of hybrid renewable energy sources (wind/solar, etc.), and also sustainability in energy and buildings. Dr. Ekren has authored and coauthored many international journal papers, international conference papers, and also books and book chapters. He is currently involved in several research projects funded by national research council (TUBITAK) and EC-FP7 project (EcoShopping).
