Switched linear control for refrigerant superheat recovery in vapor compression systems. (December 2016)

• Record Type: Journal Article
• Authors: Pangborn, Herschel C.; Alleyne, Andrew G.
• Is Part Of: Control engineering practice. Volume 57(2016)
• Page Start: 142
• Page End: 156
• Publication Date: 2016-12
• Subjects: Vapor compression system -- Superheat recovery -- Switched linear control; Automatic control -- Periodicals; 629.89
• DOI: 10.1016/j.conengprac.2016.08.015
• Languages: English
• ISSNs: 0967-0661

Abstract

Abstract: Extended durations of liquid refrigerant ingestion by the compressor of a vapor compression system (VCS) can lead to damage or failure of this component. While this can be prevented by inserting an accumulator between the evaporator and compressor, this addition of hardware may be undesirable for applications in which the weight or size of the thermal management system is critical. As an alternative, this paper proposes a switched Linear Quadratic Gaussian (LQG) design to quickly recover the presence of a superheated phase at the exit of the evaporator using feedback control. Stability analysis of the closed-loop switched system is presented, and application of the control approach in both simulation and on an experimental VCS testbed demonstrate the success of the control design. Highlights: Develops a switched linear controller for superheat recovery. Proves stability under average dwell time switching signals. Validates the control approach with simulation and experimental results.