Department Seminar by Dr. Gökmen Demirkaya

Cogeneration of Power and Cooling: The Promise and the Challenges

Dr. Gökmen Demirkaya, GAMA Power Systems

Wednesday, October 09, 2013
Time: 13:40
Place: EA 409

Combined power and refrigeration cycles have been explored for improving their overall energy conversion efficiency and decreasing the cost of energy produced. Bottoming cycles can be used to recover the waste heat or exhaust heat of gas turbines and conventional steam Rankine cycles and convert it to work and/or refrigeration. In most applications, refrigeration is the more expensive product than power because it requires refrigeration equipment as well as power to produce conventional refrigeration. Therefore, the additional output of refrigeration by the combined cycle provides greater benefit than conventional power systems. This seminar will introduce a binary-mixture combined power and cooling cycle which combines the Rankine and absorption refrigeration cycles. In addition, a brief outlook of solar energy potential in Turkey will be presented.

About the Speaker:

Dr. Gökmen Demirkaya earned his B.Sc. and MSc. in Mechanical Engineering from Middle East Technical University and PhD. in Mechanical Engineering from University of South Florida. He is currently holding the Performance Engineer position at Gama Power Systems, working on design of combined and thermal power plants, performance and cost optimization of proposals. Over the past 10 years, he has gained experience on computational and experimental techniques in heat transfer and fluid mechanics, concentrated solar and photovoltaic power plants, utilization of low grade and waste heat by alternative generation systems. He has published 9 technical articles in Peer-Reviewed journals on his interest areas, primarily on low heat utilization, combined power and cooling cycles. He is also currently teaching a 4th year technical course on ‘Energy Engineering’ at Başkent University as a part-time instructor. Gökmen can be reached at

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