Refrigeration and Heat Pumps 101: Master the Basics

Dr. Metkel Yebiyo is a Senior Researcher and Technical Expert in Energy Systems at RISE Research Institutes of Sweden. His work centres on heat pumps, industrial waste heat recovery, district heating networks, energy system resilience and security of supply. He coordinates RISE's participation in the IEA Heat Pumping Technologies Technology Collaboration Programme (HPT TCP), holds editorial roles including the HPT Magazine, and leads or contributes to European research collaborations under CETPartnership, IEA DHC and Horizon Europe. Before joining RISE, Dr. Yebiyo spent several years at London South Bank University, first as a Postdoctoral Research Fellow and then as Senior Lecturer in Sustainable Energy Systems and Course Director of Building Services Engineering. He supervised six PhD students and many MSc students, and was a sabbatical researcher at KTH Royal Institute of Technology in Stockholm before moving to RISE. He completed his PhD on the optimisation of control strategies for ground source heat pumps. His research interests include high-efficiency heat pumps, refrigeration and air conditioning, heat transfer, waste heat recovery, renewable and low-carbon technologies, and refrigerant leakage and carbon emissions. He has more than 35 publications in peer-reviewed journals and conferences, and is the author of two books. Dr. Yebiyo has taught a wide range of building services and energy subjects, including Refrigeration, Air Conditioning and Heat Pump Engineering, Heat and Mass Transfer Applications, Energy Management and Controls, Heating and Ventilation Systems, Integrated Building Design, Internal Environment and Comfort, Lighting and Electrical Systems, Passive Building Design, and Construction Practice (Revit and AutoCAD). His courses turn these university lectures into clear, practical lessons with worked examples for students and practising engineers.