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Scheduled Feedforward Control of Superheat Through Hardware-in-the-Loop Load Emulation

[+] Author Affiliations
Richard Otten, Andrew G. Alleyne

University of Illinois at Urbana-Champaign, Urbana, IL

Paper No. DSCC2010-4095, pp. 445-452; 8 pages
doi:10.1115/DSCC2010-4095
From:
  • ASME 2010 Dynamic Systems and Control Conference
  • ASME 2010 Dynamic Systems and Control Conference, Volume 2
  • Cambridge, Massachusetts, USA, September 12–15, 2010
  • Conference Sponsors: Dynamic Systems and Control Division
  • ISBN: 978-0-7918-4418-2 | eISBN: 978-0-7918-3884-6
  • Copyright © 2010 by ASME

abstract

Variable speed refrigeration systems have the potential for improved energy savings compared to conventional on-off systems. A single-input-single-output (SISO) control structure does not adequately regulate control parameters due to strong coupling inherent to the vapor compression cycle (VCC). With the use of an electronic expansion valve (EEV) a feedforward control configuration may be implemented to remove the effects of compressor speed changes on evaporator superheat, thus allowing better regulation during transients. Due to the nonlinearity of the VCC a scheduled feedforward compensator is proposed to effectively reject a compressor disturbance over the wide range of operating conditions typically experienced by variable speed systems. The proposed control structure allows superheat regulation at a low level without risking compressor damage, therefore helping maximize system efficiency. This paper presents experimental results obtained through load emulation. This is a novel approach which performs a task similar to the automotive dynamometer, where various size loads and environmental conditions may be placed on a VCC through an on-line experimental simulation.

Copyright © 2010 by ASME

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