<div class="csl-bib-body">
<div class="csl-entry">Poks, A., Fallmann, M., Fink, L. F., Rinnofner, L., & Kozek, M. (2023). Fault detection and isolation for a secondary loop refrigeration system. <i>Applied Thermal Engineering</i>, <i>227</i>, Article 120277. https://doi.org/10.1016/j.applthermaleng.2023.120277</div>
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dc.identifier.issn
1359-4311
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/175786
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dc.description.abstract
Secondary loop refrigeration systems offer advantages over conventional system architectures: refrigerant charge reduction, maintenance simplification, and reduced safety hazards. Currently, no model-based fault detection for a secondary loop system has been reported. This article presents a fault detection and isolation scheme for a secondary loop refrigeration system where parametric faults (dirt/ice-buildup and secondary loop pump failure) and sensor faults (four temperature sensors in the secondary loop) are detected and isolated. The fault detection and isolation system is based on unknown input observers and on extended Kalman filters. The models are obtained through physical relations combined with experimental parameter determination (gray-box model) and are cross-validated against measurement data. The complete fault detection and isolation architecture is experimentally validated on a secondary loop refrigeration system mounted on a cooling box inside a climate chamber. Experimental results show that important parametric faults can be reliably detected and isolated, and the fault detection and isolation of sensor faults are effective.
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dc.description.sponsorship
FFG - Österr. Forschungsförderungs- gesellschaft mbH; Productbloks GmbH
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dc.language.iso
en
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dc.publisher
Elsevier
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dc.relation.ispartof
Applied Thermal Engineering
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dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
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dc.subject
Fault detection
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dc.subject
Fault isolation
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dc.subject
Secondary loop refrigeration
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dc.subject
Model-based method
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dc.subject
Extended Kalman filter
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dc.subject
Unknown input observer
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dc.subject
Experimental validation
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dc.title
Fault detection and isolation for a secondary loop refrigeration system