Yunus Çengel is a Professor Emeritus at the University of Nevada, Reno, USA. He received his Ph.D. in Mechanical Engineering from North Carolina State University and served as a faculty member at the University of Nevada, Reno since 1984. He was the Director of the Industrial Assessment Center and served as a consultant in the areas of energy efficiency, renewable energy, and energy policies. Professor Çengel is the author or coauthor of several widely adopted engineering textbooks such as Thermodynamics: An Engineering Approach, Heat and Mass Transfer: Fundamentals and Applications, and Fluid Mechanics: Fundamentals and Applications, all published by McGraw-Hill.
Energy and Exergy Efficiencies of Geothermal Power Plants
The way to get more from the same resource is to increase efficiency. For this, the current state of efficiency needs to be known. There are many different definitions of efficiency. In general terms, efficiency or performance is defined as the ratio of the ‘desired output’ to ‘required input’. In this presentation, all indices related to energy and exergy efficiency in geothermal power plants are examined and different efficiencies used are systematically defined. This makes it possible to determine the performance of a geothermal power plant from different perspectives. Also, the relationships between different energy and exergy efficiencies are clarified. These efficiency definitions provide a consistent basis for performance improvement studies in geothermal power plants. The efficiency definitions given can be extended to different energy fields.
Professor Emeritus of Mechanical Engineering
University of Nevada, Reno, NV, USA
Yunus Çengel is a Professor Emeritus at the University of Nevada, Reno, USA, and the founding dean of the Faculty of Engineering at Adnan Menderes University in Aydin, Turkey. He received his Ph. D. in Mechanical Engineering from North Carolina State University in the USA. Before joining ADU in 2012, he held the position of the Dean of the Faculty of Mechanical Engineering at Yildiz Technical University and as Advisor to the President of the Scientific and Technological Research Council (TUBITAK) on international cooperation. Professor Cengel served as the assistant director and director of the Industrial Assessment Center at UNR for eight years. He also served as the advisor to several government organizations and private companies on energy efficiency, energy policies, and education reform.
Professor Çengel is the author or co-author of the widely adopted textbooks Thermodynamics: An Engineering Approach, Fundamentals of Thermal-Fluid Sciences, Heat and Mass Transfer: Fundamentals and Applications, Fluid Mechanics: Fundamentals and Applications, Differential Equations for Scientists and Engineers, Fundamentals and Applications of Renewable Energy, and Energy Efficiency and Management for Engineers, all published by McGraw-Hill. Some of his textbooks have been translated into Chinese, Japanese, Korean, Thai, Spanish, Portuguese, Turkish, Italian, Greek, and French.
Dr. Çengel has delivered several keynote and invited lectures at technical conferences and academic institutions. He is the recipient of several outstanding teacher awards, and he has received the ASEE Meriam/Wiley Distinguished Author Award for excellence in authorship twice. In 2022, he was inducted into the Hall of Fame in Mechanical Engineering at North Carolina State University.