Compressor Abnormality Determination Using Multi-Period Data Analysis
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Solution Overview
Problem
In typical refrigeration cycle apparatuses, determining compressor deterioration requires a special operation to ensure the refrigerant conditions at initial installation match those after a predetermined period, disrupting normal cooling operations.
Innovation Solution
An abnormality determination device calculates a deviation degree of the compressor from a normal state using data from both a first period and a second period, allowing for abnormality determination or estimation of abnormality occurrence time without a special operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a special operation is performed to determine compressor deterioration by comparing operation state amounts under predetermined refrigeration conditions, then the determination accuracy is improved, but normal cooling operation is disrupted
Solution Approach 1:
The system performs preliminary recording of operation state amounts during normal cooling operations before deterioration determination is needed. By accumulating data during regular operation and storing it for later analysis, the system eliminates the need to interrupt cooling for special measurement operations, thus maintaining productivity while enabling accurate deterioration assessment through preliminary data collection
Solution Approach 2:
The system enables continuous cooling operation by performing deterioration determination through analysis of previously recorded data rather than requiring interruption for measurement. The useful action of cooling continues uninterrupted while the determination process operates on stored historical data, ensuring both productivity maintenance and measurement capability
2Reliability
If refrigerant conditions at initial installation must match those after a predetermined period for deterioration determination, then the reliability of determination is improved, but operation time is increased due to special operation requirements
Solution Approach 1:
The system records operation state amounts during normal operations before deterioration determination is required, storing this data for future comparison. This preliminary data collection during standard operation eliminates the need for time-consuming special operations later, maintaining determination reliability through consistent data collection while minimizing time loss
Solution Approach 2:
The system creates a copy of the initial operation state amount data and stores it for later comparison with current operation state amounts. By using data copying and storage rather than requiring repeated measurements under identical conditions, the system maintains determination reliability while significantly reducing the time required for deterioration assessment
Data Source
AI summary
An abnormality determination device (60) includes a calculator (66) calculating a deviation degree of a compressor (11) from a normal state based on data related to operation of a refrigeration apparatus (1) and a determination unit (62) determining whether the compressor (11) has an abnormality or estimating an abnormality occurrence time based on a calculation result of the calculator (66). The calculator (66) calculates a first index value from data related to operation of the refrigeration apparatus (1) in a first period and a second index value from data related to operation of the refrigeration apparatus (1) in a second period that differs in length from the first period. The calculator (66) calculates the deviation degree of the compressor (11) from the normal state based on the first index value and the second index value. The determination unit (62) determines whether the compressor (11) has an abnormality or estimates an abnormality occurrence time based on the deviation degree of the compressor (11) from the normal state.


