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2017 | OriginalPaper | Chapter

Amelioration of Energy Efficiency for Refrigeration Cycles by Means of Ejectors

Authors : Ahrendts Fabian, Thoma Werner, Köhler Jürgen

Published in: Energy and Thermal Management, Air Conditioning, Waste Heat Recovery

Publisher: Springer International Publishing

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Abstract

In this paper is explained how the efficiency of refrigeration cycles and in particular those with carbon dioxide (CO2, R744) as refrigerant can be augmented by use of an ejector. Special emphasis is put on the exposure of CO2 as a safe and environmental friendly working fluid – making it a promising candidate to replace today’s standard refrigerant in the automotive field tetrafluoroethane (R134a), which is about to be banned within the European Union for mobile applications.
The working principle of ejectors as well as their operational behaviour is described. Furthermore an approach to quantify ejector efficiency is presented. Different classes of refrigeration cycles with ejectors are introduced and an automotive application example from an ongoing research project is described in detail: It is shown how an ejector can be fruitfully put into place in charge air cooling.

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previous chapter Monitoring the Fresh-Air Flow Rate for Energy-Efficient Bus Ventilation
next chapter Performance Control of Refrigeration Cycles by Adjustment of the Composition of the Working Fluid
Literature
Bergangder, M.J.: Ejector refrigeration cycles. In: Gaspar, P.D., da Silva, P.D. (eds.) Handbook of Research on Advances and Applications in Refigeration Systems and Technologies (2015)
Elbel, S., Reichle, M., Bowers, C., Hrnjak, P.: Integration of a two-phase ejector into a compact, lightweight unitary-type air-conditioner using R744 for energy efficient operation in hot climates. In: Proceedings of 10th IIR Gustav-Lorentzen Conference (2012)
Elbel, S.: Experimental and analytical investigation of a two-phase ejector used for expansion work recovery in a transcritical R744 air-conditioning system. Ph.D. thesis, University of Illinois at Urbana-Champaign (2007)
Elbel, S.: Historical and present developments of ejector refrigeration systems with emphasis on transcritical carbon dioxide air-conditioning applications. In: International Seminar on Ejector/Jet-pump Technology and Applications, Louvain-la-Neuve, Belgium, 7–9 September 2009
Elbel, S., Hrnjak, P.: Experimental validation of a prototype ejector designed to reduce throttling losses encountered in transcritical R744 system operation. Intl. J. Refrigeration 31(3), 411–422 (2008)
Elgozali, A., Linek, V., Fialová, M., Wein, O., Zahradník, J.: Influence of viscosity and surface tension on performance of gas-liquid contactors with ejector type gas distributor. Chem. Eng. Sci. 7(15), 2987–2994 (2002)
Fiorenzano, R.: Untersuchung von Ejektor-Kälteanlagen beim Einsatz in tropischen Gebieten, Ph.D. thesis, Technische Universität Braunschweig, Germany (2011)
Gay, N.H.: Refrigerating system, U.S. Patent 1,836,318 (1931)
Köhler, J., Richter, C., Tegethoff, W., Tischendorf, C.: Experimental and theoretical study of a CO2 ejector refrigeration cycle. In: VDA Winter Meeting Saalfelden (2007)
Lucas, C., Koehler, J.: Experimental investigation of the COP improvement of a refrigeration cycle by use of an ejector. Intl. J. Refrigeration 35(6) 1595–1603 (2012)
Lucas, C.: Untersuchung der Betriebscharakteristik von zweiphasigen CO2 Ejektoren. Ph.D. thesis, Technische Universität Braunschweig, Germany (2015)
Jeong, J., Saito, K., Kawai, S.: Efficiency enhancement of vapor compression refrigerator using natural working fluids with two-phase flow ejector. In: Proceedings of 6th IIR Gustav Lorentzen Conference on Natural Working Fluids, Glasgow, United Kingdom (2004)
Tischendorf, C., Lucas, C., Koehler, J., Tegethoff, W.: Visual investigation of an ejector motive nozzle. In: Proceedings of the ASME 2010 International Mechanical Engineering Congress & Exposition, Vancouver, Canada (2010)
Metadata
Title
Amelioration of Energy Efficiency for Refrigeration Cycles by Means of Ejectors
Authors
Ahrendts Fabian
Thoma Werner
Köhler Jürgen
Copyright Year
2017
Book
Energy and Thermal Management, Air Conditioning, Waste Heat Recovery

Print ISBN: 978-3-319-47195-2

Electronic ISBN: 978-3-319-47196-9

Copyright Year: 2017

DOI
https://doi.org/10.1007/978-3-319-47196-9_13