A fault tolerant superheat control strategy for supermarket refrigeration systems

Kasper Vinther, Roozbeh Izadi-Zamanabadi, Henrik Rasmussen, Jakob Stoustrup

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

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Abstract

In this paper, a fault tolerant control (FTC) strategy is proposed for evaporator superheat control in supermarket refrigeration systems. Conventional control uses a pressure and temperature sensor for this purpose, however, the pressure sensor can fail to function. A contingency control strategy, based on a maximum slope-seeking control method and only a single temperature sensor, is developed to drive the evaporator outlet temperature to a level that gives a suitable superheat of the refrigerant. The FTC strategy requires no a priori system knowledge or additional hardware and functions in a plug & play fashion. The strategy is outlined by means of procedural steps as well as a flow chart that also illustrates the process of automatic tuning of the maximum slope-seeking controller. Test results are furthermore presented for a display case in a full scale CO2 supermarket refrigeration system.
Original languageEnglish
Title of host publicationProceedings of the 2nd International Conference on Control and Fault Tolerant Systems
PublisherIEEE Press
Publication date2013
ISBN (Print)978-1-4799-2855-2
DOIs
Publication statusPublished - 2013
Event2nd International Conference on Control and Fault Tolerant Systems - Nice, France
Duration: 9 Oct 201311 Oct 2013
Conference number: 2

Conference

Conference2nd International Conference on Control and Fault Tolerant Systems
Number2
Country/TerritoryFrance
CityNice
Period09/10/201311/10/2013

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