R744 (= CO2) is an environmental friendly natural refrigerant. Besides this aspect also the benefits of an R744 climate control system particularly the high cooling performance are now widely recognized. It is shown that caused by the physical properties of R744, especially the low critical temperature, the development of appropriate control strategies are necessary, e.g. to avoid unacceptable high pressures after switch-on of the A/C-system or at rapidly changes of speed (acceleration of the car). On the other hand the basic control concept is shown to optimize the efficiency of the system by controlling the high pressure in the supercritical operating range. The evaporator temperature control with externally controlled variable displacement compressors which is today in Europe very common is not so different to R134a systems. Depending on the control device of the compressor different control concepts have to be adjusted. Basically the R744 A/C-system is ready for series development. An SOP could be in the second half of the decade, depending on decisions of car manufacturers.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Control technologies to optimize operating performance of R744 climate control systems


    Weitere Titelangaben:

    Regelungstechniken zur Optimierung der Betriebseigenschaften von R744-Klimaregelsystemen


    Beteiligte:
    Kampf, H. (Autor:in) / Sickelmann, M. (Autor:in) / Taxis-Reischl, B. (Autor:in) / Baruschke, W. (Autor:in) / Feuerecker, G. (Autor:in) / Raiser, H. (Autor:in)


    Erscheinungsdatum :

    2003


    Format / Umfang :

    22 Seiten, 14 Bilder, 2 Tabellen, 15 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Control technologies to optimize operating performance of R744 climate control systems

    Kampf,H. / Sickelmann,M. / Taxis-Reischl,B. et al. | Kraftfahrwesen | 2003


    Control technologies to optimize operating performance of R744 climate control systems

    Kampf, H. / Sickelmann, M. / Taxis-Reischl, B. et al. | British Library Conference Proceedings | 2003


    R744 Parallel Compression Cycle for Automotive Climate Control

    Johnston, Bill / Dhar, Debasish / He, Jing et al. | SAE Technical Papers | 2017


    R744 Parallel Compression Cycle for Automotive Climate Control

    He, Jing / Johnston, Bill / Dhar, Debasish et al. | British Library Conference Proceedings | 2017


    Control Strategies for Transcritical R744 Systems

    McEnaney, R. P. / Hrnjak, P. S. / Society of Automotive Engineers | British Library Conference Proceedings | 2000