Norbert Stulgies
Technical University Braunschweig, Institut für Thermodynamik, Germany
Manuel Gräber
Technical University Braunschweig, Institut für Thermodynamik, Germany
Wilhelm Tegethoff
Technical University Braunschweig, Institut für Thermodynamik, Germany
Sven Försterling
TLK Thermo GmbH, 38106 Braunschweig, Germany
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http://dx.doi.org/10.3384/ecp09430035Ingår i: Proceedings of the 7th International Modelica Conference; Como; Italy; 20-22 September 2009
Linköping Electronic Conference Proceedings 43:32, s. 299-303
Publicerad: 2009-12-29
ISBN: 978-91-7393-513-5
ISSN: 1650-3686 (tryckt), 1650-3740 (online)
Due to the development of high efficiency R744 air conditioning systems; the main aim of this paper is the investigation of a control concept for swash plate compressors.
This paper presents three different control concepts for a swash plate compressor using a built-in control valve. Therefore a model for a one-phase R744 expansion valve was developed and adapted to detailed measurement data. To achieve high reliability in the simulation; the entire R744 refrigerant cycle was validated using analyses of measurement data from an IfT test bench. The simulation of the refrigeration cycle components was realised using TIL (TLK-IfT-Library). The main focus was set as the description of the compressor with its internal and external mass flow rates. The internal mass flow; which is directed through the crankcase; directly affects the crankcase pressure. It is also called the control mass flow. As a result of the crankcase pressure an adjustable mechanism regulates the displacement as shown in figure 1. The greater the displacement; the greater is the inclination angle. This is caused by different load incidence points on the swash plate e.g. by springs; pistons and pressure states. A comparison of different control concepts shows the characteristic and control behaviour of each of them relating to control time and control mass flow rate. Whenever a control mass flow occurs; it implicates throttle losses. The dissipated energy can be minimised using another control concept.
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