A method and system for constructing a phase equilibrium database for a three-stage auto-cascade refrigeration

By collecting and optimizing the operating parameters of the multi-component non-azeotropic working fluid in the field of the three-stage self-cascade refrigeration unit, a phase equilibrium database adapted to the complex operating conditions of the biobank was constructed, solving the problem of insufficient adaptability of the existing database and realizing the stable and efficient operation of the unit.

CN122111982APending Publication Date: 2026-05-29SHANDONG KAIXIN REFRIGERATION ENG CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANDONG KAIXIN REFRIGERATION ENG CO LTD
Filing Date
2026-02-27
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

The existing phase balance database of the three-stage self-cascade refrigeration unit is unable to adapt to the complex operating conditions at the biobank site, resulting in the separation of working fluid components, crystallization blockage in the low-temperature section pipeline, and inability to match dynamic load and environmental conditions, thus affecting the stable operation of the unit.

Method used

Raw operating parameters of multi-component non-azeotropic working fluids are collected on-site at the biobank. An initial phase equilibrium data set is constructed by using a multimodal sensor array, sliding time window noise reduction, and outlier correction. Combined with spatial state vectors and dynamic correction factors, operating condition adaptive optimization is performed, and finally a dedicated database is built.

Benefits of technology

It improves the on-site adaptability and calculation accuracy of phase balance data, avoids unit operation failures, ensures the long-term stable and efficient operation of the three-stage self-cascade refrigeration unit, and meets the needs of deep cryogenic storage of biological samples.

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Abstract

The application provides a kind of three-stage self-recovery cascade refrigeration phase equilibrium database construction method and system, it is related to refrigeration engineering technical field, the method includes: in the actual operation process of three-stage self-recovery cascade refrigeration unit in biological sample library field, the original operating parameter of multicomponent non-azeotropic mixed working medium is collected;According to the original operating parameter, by rejecting noise and correcting abnormal value, obtain the working medium operating data set after pre-processing;Based on the working medium operating data set after pre-processing, calculate and establish the gas-liquid phase equilibrium and solid-liquid phase equilibrium parameter relationship of mixed working medium under the operating condition of unit, to obtain initial phase equilibrium data set;Based on initial phase equilibrium data set, at the key node of unit operating loop, select multiple fixed space reference points and collect state parameters to form space state vector.The application realizes the field collection, dynamic correction and operating condition adaptation optimization of phase equilibrium data.
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