Evaporator for ORC cycle  with recirculating heat carring water – computational model

Tomasz Kujawa; Władysław Nowak

doi:10.30464/jmee.2018.2.4.301

Tomasz Kujawa Department of Heat Engineering, Faculty of Mechanical Engineering and Mechatronics, West Pomeranian University of Technology, Szczecin, Poland https://orcid.org/0000-0001-8168-1167
Władysław Nowak Department of Heat Engineering, Faculty of Mechanical Engineering and Mechatronics, West Pomeranian University of Technology, Szczecin, Poland

DOI: https://doi.org/10.30464/jmee.2018.2.4.301

Keywords: Evaporator, Recirculation, Average specific heat, ORC power plant, Mathematical modeling

Abstract

The following paper presents an ORC installation including an evaporator with recirculation (heat carrying water exiting the evaporator is redirected to its inlet). It covers the calculations of inlet/outlet temperature of the evaporator taking into account a variant recirculation coefficient. Formulas for heat transfer between heat carrying water and working fluid inside evaporator are also included in this paper. The calculations are based on properly defined average specific heat. The analysis shows that the system performance depends on heat carrying water inlet temperature, on heat carrying water flow rate and the recirculation coefficient.

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Author Biographies

Tomasz Kujawa, Department of Heat Engineering, Faculty of Mechanical Engineering and Mechatronics, West Pomeranian University of Technology, Szczecin, Poland

Tomasz Kujawa received his M.Sc. degree in Mechanical Engineering (specialization: Thermal Energy Systems) from Mechanical Faculty and next Ph.D (with honors) degree in Construction from Faculty of Civil Engineering and Architecture, Technical University of Szczecin, in 1993 and 2003, respectively. Since 1993 he has been a researcher in Department of Heat Engineering, Faculty of Mechanical Engineering and Mechatronics, West Pomeranian University of Technology, Szczecin (earlier Technical University of Szczecin). He currently works as a lecturer. His scientific interests focus on problems of obtaining geothermal energy (ground heat exchangers) and ORC installations. He has participated in over 8 national research projects, presenting results of his work at international and national conferences, published more than 80 scientific papers in international and national journals, book chapters, as well as conference proceedings. He is also the co-author of2 monographs.

Władysław Nowak, Department of Heat Engineering, Faculty of Mechanical Engineering and Mechatronics, West Pomeranian University of Technology, Szczecin, Poland

Władysław Nowak received his M.Sc. degree in specialization of Shipbuilding and next Ph.D as well as D.Sc. degree from Gdańsk University of Technology, in 1959, 1965 and 1971, respectively. From 1978 he was as an associated professor, from 1991 to the position of full professor. From 1957 until his retirement, he worked continuously at the Faculty of Mechanical Engineering at the Szczecin University of Technology. In his professional life he performed many functions, among others vice-dean and dean of the Faculty of Mechanical Engineering and rector of the Szczecin University of Technology. In the years 1978-2003 he was the head of the Department of Heat Engineering. Scientific and research interests include: renewable energy sources (with ORC), geothermal heat plants, heat management, ventilation and air conditioning, heat exchange and heat exchangers. His specialty is thermal technology, especially heat transfer, has a significant scientific output, including authorship or co-authorship of 5 monographs, 6 didactic scripts, 5 patents, 3 patent applications and over 450 original scientific publications in major national and international scientific journals. and conference materials. He promoted 11 doctors, 4 of whom received a postdoctoral degree and 3 are titular professors. He is a reviewer of 17 habilitation dissertations and 27 doctoral dissertations from Poland and abroad. He made 10 opinions for awarding the title of professor and a dozen for the position of full professor. Promoter of over 250 diploma theses. Organizer and co-organizer of national and international symposia and conferences, including: Heat Transfer and Renewable Sources of Energy. From January 1, 2003, Professor Władysław Nowak is retired, still working actively in the field of science and playing an important role in the activity and development of the parent unit, which is the Department of Heat Engineering.