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Application of dual-mode switching control to vapor compression refrigeration systems.

Number: pap. ID: 115

Author(s) : OLIVEIRA V., TROFINO NETO A., HERMES C. J. L.

Summary

This paper explores a novel control strategy for small-capacity (< 1 kW) vapor compression refrigeration systems that is aimed to keep the system running at the optimum performance condition by acting concurrently on the compressor speed and on the expansion valve opening. The controller was designed based on switching control rules obtained using a multiple Lyapunov function approach that guarantees an asymptotic convergence of the system states to a desired point of equilibrium. Tailored experiments for the system identification and controller evaluation exercises (reference tracking, disturbance rejection and energy performance) were carried out using a breadboard refrigeration facility comprised of a variable-speed compressor (VCC), an electric expansion valve (EEV), and two secondary flow rate and temperature controlled brine loops. The switching controller showed to be able to drive the system towards the reference and also to reject the imposed disturbances satisfactorily. Energy performance comparisons considering the proposed controller and a classical dual-SISO approach are also discussed.

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Pages: 8 p.

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Details

  • Original title: Application of dual-mode switching control to vapor compression refrigeration systems.
  • Record ID : 30001559
  • Languages: English
  • Source: Proceedings of the 23rd IIR International Congress of Refrigeration: Prague, Czech Republic, August 21-26, 2011. Overarching theme: Refrigeration for Sustainable Development.
  • Publication date: 2011/08/21

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