Thermodynamic performance of the transcritical refrigeration cycle with ejector expansion for R744, R170, and R41
| dc.contributor.author | Atmaca A.U. | |
| dc.contributor.author | Erek A. | |
| dc.contributor.author | Ekren O. | |
| dc.contributor.author | Çoban M.T. | |
| dc.date.accessioned | 2019-10-26T21:15:34Z | |
| dc.date.available | 2019-10-26T21:15:34Z | |
| dc.date.issued | 2018 | |
| dc.department | Ege Üniversitesi | en_US |
| dc.description.abstract | For more than a decade, there is a great demand for finding environmentally-friendly refrigerants obeying the global warming potential value restrictions of the tough environmental legislation. Among the candidate working fluids, R744 (carbon dioxide or CO2), R170 (ethane), and R41 (fluoromethane) are selected to be investigated parametrically in this paper. Performance comparison is made for these three working fluids individually in both transcritical (supercritical) refrigeration cycle and modification of this cycle with ejector expansion. As the first step, the effects of the gas cooler outlet temperature, evaporator temperature, and evaporator outlet superheat temperature difference on the overall performance and percentage expansion losses are investigated within a specific gas cooler pressure range. Evaporator outlet superheat temperature difference is found to be the least effective parameter on the performance; hence, secondly, the transcritical ejector expansion refrigeration cycle is analyzed considering only evaporator temperature and gas cooler outlet temperature based on the same gas cooler pressure ranges. Thermodynamic models are constructed in Matlab® and the ejector equations for the ejector expansion refrigeration cycle are established with reference to constant pressure mixing assumption. Comparisons of the performance, percentage expansion losses, and performance improvement potential through the implementation of the ejector instead of the expansion valve among these three refrigerants having low critical temperatures represent the main objective of the paper in order to make contributions to the previous researches in the literature. ©2018 TIBTD Printed in Turkey. | en_US |
| dc.description.sponsorship | 116M367 Türkiye Bilimsel ve Teknolojik Araştirma Kurumu National Research Council EC-FP7 European Association of National Metrology Institutes, EURAMET | en_US |
| dc.description.sponsorship | The authors would like to acknowledge the support of the Scientific and Technological Research Council of Turkey (TÜBİTAK) under Grant No: 116M367. -- Dr. Orhan Ekren is Assoc.Prof. in the Solar Energy Institute at Ege University. He received the M.Sc. degree from the Department of Energy Engineering, Izmir Institute of Technology, Turkey, and Ph.D. degree from the Department of Mechanical Engineering (Thermodynamics), Turkey. He has been working at Ege University with the 15 years of work experience. He studied as a Postdoc researcher in Southern Illinois University, USA as well. 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.), also sustainability in energy and buildings. Dr. Ekren has authored and co-authored 25 international journal papers, 25 international conference papers, 5 books and book chapters and also 2 utility models on efficient operation of HVAC&R systems. Therefore, system design and experimental tests and demo studies are in his research scope. He has currently involved several research project funded by national research council (TUBITAK) and EC-FP7 project (ECOSHOPPING). -- Mustafa Turhan Çoban, borned in Bolu, Seben, Turkey in 1957. He received his BSc degree from Ege University, faculty of mechanical engineering, mechanical engineering department in 1978; his M.Sc. degree in Mechanical Engineering from Michigan Technological University (USA) in 1982. He graduated from University of Utah (USA) in 1986 with a Ph.D. in Mechanical Engineering. In 1995, he received postgraduate degree in computer science from Victoria Technological University (Australia). He worked as a lecturer and researcher at University of Nebraska, Lincoln (USA), Victoria Technological University (Australia), Ballarat University (Australia), Dokuz Eylül University, Gebze Institute of Technology, Ege University. He worked at Aras compressors (Turkey), Mineral Research and Exploration Institute of Turkey, TUBITAK (Turkish Technological and Scientific Research Foundation) Institute of Energy, Imperial Chemical Industries (Australia), Ceramic Fuel Cells Limited (Australia) as an engineer/senior engineer/researcher; TUBITAK UME (National Metrology Institute of Turkey) as technical vice-chairman. -- | en_US |
| dc.identifier.endpage | 127 | en_US |
| dc.identifier.issn | 1300-3615 | |
| dc.identifier.issn | 1300-3615 | en_US |
| dc.identifier.issue | 2 | en_US |
| dc.identifier.scopusquality | Q4 | en_US |
| dc.identifier.startpage | 111 | en_US |
| dc.identifier.uri | https://hdl.handle.net/11454/16047 | |
| dc.identifier.volume | 38 | en_US |
| dc.indekslendigikaynak | Scopus | en_US |
| dc.language.iso | en | en_US |
| dc.publisher | Turk Isı Bilimi ve Teknigi Dernegi | en_US |
| dc.relation.ispartof | Isi Bilimi Ve Teknigi Dergisi/ Journal of Thermal Science and Technology | en_US |
| dc.relation.publicationcategory | Makale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı | en_US |
| dc.rights | info:eu-repo/semantics/closedAccess | en_US |
| dc.subject | Constant pressure mixing (CPM) ejector | en_US |
| dc.subject | Ejector expansion refrigeration cycle | en_US |
| dc.subject | Expansion losses | en_US |
| dc.subject | R170 (ethane) | en_US |
| dc.subject | R41 (fluoromethane) | en_US |
| dc.subject | R744 (carbon dioxide) | en_US |
| dc.title | Thermodynamic performance of the transcritical refrigeration cycle with ejector expansion for R744, R170, and R41 | en_US |
| dc.type | Article | en_US |
