Indoor unit fault detector for a multi-split VRF system in heating mode

Title
Indoor unit fault detector for a multi-split VRF system in heating mode
Authors
신영기강상우김서영
Keywords
FDD (fault detection and diagnosis); Heat exchanger fouling; State observer; Multi-split; VRF (variable refrigerant flow); Heat pump
Issue Date
2014-04
Publisher
International journal of refrigeration
Citation
VOL 40, 152-160
Abstract
A multi-split VRF system operates unsteadily most of time due to the constantly varying refrigerant flow rates of associated indoor units. VRF systems require a different approach from conventional techniques to detect faults, which have developed based on steadystate operations. In this paper, two fault detection techniques are proposed. Their advantage is that they do not require the test data to be preprocessed to obtain steady-state data. The first technique is applied to detect heat exchanger fouling by a state observer, and the other technique is used to detect valve sticking by temperature variance. These techniques were not chosen haphazardly but were derived from physical reasoning. Their validity was confirmed by test data. The methodology developed in this study can be applied similarly to other HVAC equipment that operates mostly in transient states.
URI
http://pubs.kist.re.kr/handle/201004/47509
ISSN
01407007
Appears in Collections:
KIST Publication > Article
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