A data-driven and model-based refrigerant leak detection method for refrigeration systems
A refrigeration system, data-driven technology, applied in the direction of fluid tightness testing, machine/structural component testing, measuring devices, etc., can solve the problem of inapplicable refrigeration systems, difficult measurement of refrigerant liquid level, and inability to establish refrigerant quality calculations And other issues
Active Publication Date: 2021-05-07
SHANGHAI JIAOTONG UNIV
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Problems solved by technology
If the refrigeration system contains a flasher or a liquid storage tank, such as an intermediate supplementary air heat pump system, a large-scale commercial refrigeration system, etc., the refrigerant in such components exists in two phases, and the liquid level of the refrigerant is difficult to measure and cannot be established. An accurate theoretical model for the calculation of the refrigerant mass in the component
Therefore, the leak detection method based only on theoretical models is not suitable for this type of refrigeration system
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[0074] The following describes several preferred embodiments of the present invention with reference to the accompanying drawings, so as to make the technical content clearer and easier to understand. The present invention can be embodied in many different forms of embodiments, and the protection scope of the present invention is not limited to the embodiments mentioned herein.
[0075] Such as figure 1 As shown, the specific steps of the method are:
[0076] (1) Arrange temperature measuring points in the refrigeration system and read the existing experimental data;
[0077] (2) Establish a theoretical model of refrigerant quality in heat exchanger zones based on temperature signals, a theoretical model of refrigerant quality in compressors and connecting pipelines based on theoretical and explicit expressions;
[0078] (3) When a flasher is included in the refrigeration system, a locally weighted linear regression model based on data-driven flasher refrigerant mass calcula...
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The invention discloses a data-driven and model-based refrigerant leakage detection method for a refrigeration system, which relates to the field of refrigerant leakage detection and includes the following steps: (1) setting temperature measuring points in the refrigeration system; (2) establishing heat exchange (3) When the refrigeration system includes a flasher, establish a local weighted linear regression model for calculating the refrigerant quality of the flasher; (4) Obtain temperature measurement points The data is input into the heat exchanger partition, the theoretical model of the refrigerant quality of the compressor and the connecting pipeline, and the local weighted linear regression model for the calculation of the refrigerant quality of the flasher, and the refrigerant quality of the system is accumulated; (5) According to the description of the refrigeration system The refrigerant mass is compared to the initial charge of the refrigeration system. The method can save the amount of data required for leak detection, accurately determine whether the refrigeration system leaks and calculate the amount of leakage.
Description
technical field [0001] The invention relates to the field of refrigerant leakage detection, in particular to a data-driven and model-based refrigerant leakage detection method for a refrigeration system. Background technique [0002] Refrigeration system As the service life of the product increases, the refrigerant in the system may leak. Refrigerant leaks 10%, product performance can drop up to 27%. The performance degradation of the refrigeration system caused by the leakage of the refrigerant will increase the operating temperature of the cooled environment or equipment, which will eventually lead to increased power consumption of the cooled equipment, which may cause serious consequences such as system shutdown. Therefore, in order to avoid system failures caused by refrigerant leakage, it is of great significance to establish an accurate refrigerant leakage detection method for refrigeration systems for fault monitoring and fault isolation. The existing detection meth...
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IPC IPC(8): G01M3/00
Inventor 胡海涛孙浩然李浩吴成云王旭阳吕中原
Owner SHANGHAI JIAOTONG UNIV