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Indoor unit fault detector for a multi-split VRF system in heating mode |
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| Affiliation: | 1. Department of Mechanical Engineering, Sejong University, 98 Gunja-dong Gwangjin-gu, Seoul 143-747, Republic of Korea;2. Center for Urban Energy System Research, Korea Institute of Science and Technology, 39-1 Wolgok-2dong, Seongbuk-gu, Seoul 136-791, Republic of Korea;1. University of Alberta, Canada;2. University of Waterloo, Canada;1. Building Technology & Urban Systems Department, Lawrence Berkeley National Laboratory, One Cyclotron Road, 94720 Berkeley, CA, United States;2. Energy Analysis and Environmental Impacts Department, Lawrence Berkeley National Laboratory, One Cyclotron Road, 94720 Berkeley, CA, United States;1. Department of Refrigeration & Cryogenics, Huazhong University of Science and Technology, Wuhan, China;2. School of Mechanical Science & Engineering, Huazhong University of Science and Technology, Wuhan, China |
| 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 steady-state 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. |
| Keywords: | FDD (fault detection and diagnosis) Heat exchanger fouling State observer Multi-split VRF (variable refrigerant flow) Heat pump Détection de défaut et diagnostic Encrassage des échangeurs de chaleur Observateur d'état Multi-split Débit variable de frigorigène Pompe à chaleur |
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