Control technologies to optimize operating performance of R744 climate control systems
Control technologies to optimize operating performance of R744 climate control systems
- New search for: Kampf, H.
- New search for: Sickelmann, M.
- New search for: Taxis-Reischl, B.
- New search for: Baruschke, W.
- New search for: Feuerecker, G.
- New search for: Raiser, H.
- New search for: Kampf, H.
- New search for: Sickelmann, M.
- New search for: Taxis-Reischl, B.
- New search for: Baruschke, W.
- New search for: Feuerecker, G.
- New search for: Raiser, H.
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.
Document information
Control technologies to optimize operating performance of R744 climate control systems
Regelungstechniken zur Optimierung der Betriebseigenschaften von R744-Klimaregelsystemen
2003
22 Seiten, 14 Bilder, 2 Tabellen, 15 Quellen
Conference paper
English
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