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Expansion Devices for R-744 MAC Units
Technical Paper
2005-01-2041
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
In mobile R-744 A/C units mechanical expansion devices (e.g. orifice tubes) or electronic valves (e.g. PWM-valves) can be used. Besides the costs, aspects like coefficient of performance (COP), cooling capacity or control behavior - especially for extreme conditions - influence the choice of the valve type. This paper will present a comparison between an ideal electronic valve and a two stage mechanical orifice tube under full load and part load conditions. The influence of the expansion valve on COP and cooling capacity in different ambient conditions can be sufficiently described with steady-state simulations. The simulation tools used for this work are based on Modelica/Dymola. The simulation results show that for European climate conditions the use of two-stage orifices might increase fuel consumption.
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Authors
Citation
Lemke, N., Tegethoff, W., Köhler, J., and Horstmann, P., "Expansion Devices for R-744 MAC Units," SAE Technical Paper 2005-01-2041, 2005, https://doi.org/10.4271/2005-01-2041.Also In
References
- Wertenbach, Juergen Energy Analysis of Refrigerant Cycles VDA Winter Meeting 2004 Saalfelden
- Haffner, A. et al. Life Cycle Climate Performance (LCCP) of Mobile Air-Conditioning Systems with HFC-134a, HFC-152a and R-744 Earth Technologies Forum 2004 Washington
- Tegethoff, Wilhelm Eine objektorientierte Simulationsplattform für Kälte-, Klima- und Wärme-pumpensysteme Technische Universität Braunschweig, Düsseldorf: VDI- Verlag 1999
- www.dynasim.se 2004
- Tegethoff, W. Lemke, N. Köhler, J. Component modelling and specification using a new approach for transient simulation VDA Winter Meeting 2004 Saalfelden