A method for providing a diagnostic assessment of a chiller
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Solution Overview
Problem
Current methods for evaluating chiller performance over time lack precision and effectiveness, making it difficult to determine when a chiller needs replacement based on changing performance parameters like Energy Efficiency Ratio (EER) and Coefficient of Performance (COP).
Innovation Solution
A diagnostic assessment method and system that measure and map performance parameters such as EER, COP, and other metrics based on load and temperature conditions, using sensors and a control unit to calculate and extrapolate diagnostic values across a defined input space, allowing for continuous evaluation and upgrading of performance trends over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional performance evaluation methods are used for chillers, then the evaluation process is simple, but the precision and effectiveness of performance assessment deteriorates
Solution Approach 1:
The performance assessment is segmented into multiple diagnostic parameters (COP, EER, temperature differences, pressures) measured at different operating conditions. Each parameter is evaluated separately and then integrated to form a comprehensive performance map, allowing precise assessment without requiring a single complex measurement system
Solution Approach 2:
The invention transitions from single-point performance measurements to a multi-dimensional performance map by evaluating diagnostic parameters across various operating conditions (different temperatures, pressures, loads). This dimensional expansion enables precise performance tracking over time and across different chiller states
2Reliability
If performance parameters are monitored at single operating points, then the measurement process is simple, but the ability to evaluate performance trends over time deteriorates
Solution Approach 1:
Performance maps are created in advance by collecting diagnostic data across the full range of expected operating conditions. This preliminary mapping allows rapid assessment of current performance by comparing real-time measurements against the pre-established maps, eliminating the need for time-consuming comprehensive evaluations each time performance is checked
Solution Approach 2:
The system continuously compares current diagnostic parameters against the stored performance maps to provide feedback on chiller health and performance degradation. This feedback mechanism enables reliable trend evaluation over time by highlighting deviations from expected performance patterns
3Measurement precision
If diagnostic parameters are measured at multiple operating conditions, then performance assessment precision is improved, but the complexity of data collection and analysis increases
Solution Approach 1:
The performance map serves multiple functions: it stores diagnostic data, provides baseline for comparison, identifies performance degradation, and guides maintenance decisions. This universal structure handles the complexity of multi-condition data through a unified mapping approach that can be applied across different chiller types and operating scenarios
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Provides a precise and effective evaluation of chiller performance, enabling timely identification of performance degradation and optimizing maintenance schedules, thereby improving energy efficiency and operational reliability.
Implementation Method 1
The condenser is configured for providing heat exchange between the refrigerant fluid and an external fluid (for example external air or water). In particular, in the condenser the refrigerant fluid releases heat to said external fluid, resulting in condensation of the refrigerant fluid.
Implementation Method 2
The evaporator is configured for providing heat exchange between the refrigerant fluid and a fluid to be cooled (for example, room air to be cooled or water to be cooled). In particular, in the evaporator, the refrigerant fluid absorbs heat from said fluid to be cooled, resulting in evaporation of the refrigerant fluid.
Data Source
Figure 1~2
Figure 3
AI summary
A method for providing a diagnostic assessment of a chiller (1), the chiller (1) being provided with a plurality of components including a condenser (3), an evaporator (4), an expansion valve (5) and a refrigerant fluid, comprises the following steps: providing a diagnostic parameter (9), representative of a performance of the chiller (1) or of one of its components; providing a first input parameter (7) and a second input parameter (8), the first and the second input parameter (7, 8) being representative of a working condition of the chiller (1) or of one of its components; memorizing a plurality of values for the diagnostic parameter (9), each value being measured at a respective couple of values of the first and second input parameter (7, 8), whereby providing a mapping (10) of the diagnostic parameter (9) in an input space defined by the first and second input parameters (7, 8), so that each couple of values of the first and second input parameter (7, 8) defines a corresponding point in the input space (10).