CN-122020259-A - Operation and maintenance data management method and system for central air conditioning equipment

CN122020259ACN 122020259 ACN122020259 ACN 122020259ACN-122020259-A

Abstract

The application provides a method and a system for managing operation and maintenance data of central air-conditioning equipment, which are applied to the technical field of operation and maintenance data management of air-conditioning equipment, and combining the environmental state parameters of the position of the sensor, calculating a theoretical reference value by using a thermodynamic equilibrium model of the equipment, and judging whether the sensor has measurement drift according to whether the deviation value and the environmental state parameters meet preset conditions. And once the measurement drift is determined, replacing the second operation parameter by the theoretical reference value to serve as an equipment state evaluation basis, and outputting equipment fault early warning information. Therefore, the application has the advantages of effectively identifying the measurement drift of the sensor, avoiding misjudgment and misoperation and ensuring the stable operation of the equipment.

Inventors

Die Yaoming
DENG YIHAI
LI SENCAI

Assignees

广东汉维科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260410

Claims (10)

1. A method for managing operation and maintenance data of a central air conditioning device, the method comprising the steps of: S1, acquiring a first operation parameter set of central air conditioning equipment and acquiring a second operation parameter to be checked, which is measured by a sensor, wherein the first operation parameter set comprises a plurality of operation variables with thermodynamic association relation with the second operation parameter; S2, acquiring environmental state parameters of the position of the sensor; S3, calculating by using a preset equipment thermodynamic equilibrium model based on the first operation parameter set to obtain a theoretical reference value corresponding to the second operation parameter, and calculating a deviation value of the second operation parameter and the theoretical reference value; s4, judging whether the deviation value meets a preset deviation characteristic condition or not, and judging whether the environmental state parameter meets a preset environmental overrun condition or not; S5, if the deviation value meets the deviation characteristic condition and the environmental state parameter meets the environmental overrun condition, judging that the sensor has measurement drift; and S6, under the condition that the sensor is judged to have measurement drift, replacing the second operation parameter by using the theoretical reference value as a central air conditioning equipment state evaluation basis, and outputting equipment fault early warning information according to a comparison result of the theoretical reference value and a preset operation threshold value.
2. The method according to claim 1, wherein in step S1, the first operation parameter set includes a chilled water inlet and outlet water temperature, a cooling water inlet and outlet water temperature, a water pump flow rate, and a compressor power, and the second operation parameter is a refrigerant pressure.
3. The method for managing operation and maintenance data of a central air conditioning unit according to claim 2, wherein step S2 comprises: S21, acquiring local environment temperature data of the position of the sensor through an environment monitoring unit or acquiring operation temperature data of heat source equipment adjacent to the sensor through an external control interface, wherein the environment state parameter is the local environment temperature data or the operation temperature data.
4. The method for managing operation and maintenance data of a central air conditioning unit according to claim 2, wherein step S3 comprises: s31, calculating the heat exchange quantity of the condenser according to the water flow rate of the cooling water and the water temperature difference of the cooling water inlet and outlet; s32, deducing theoretical saturation temperature of the refrigerant based on the heat exchange amount of the condenser and the power of the compressor by combining a thermodynamic equilibrium principle; S33, determining the theoretical reference value corresponding to the refrigerant pressure according to the theoretical saturation temperature, and calculating the deviation value of the refrigerant pressure and the theoretical reference value.
5. The method for managing operation and maintenance data of a central air conditioner according to claim 1, wherein in step S4, the preset deviation feature condition includes that the deviation value continuously exceeds a preset deviation threshold value, and the variation trend of the deviation value and the variation trend of the environmental state parameter satisfy a positive correlation, the environmental overrun condition includes that the environmental state parameter exceeds a preset environmental temperature threshold value, and step S4 includes: S41, judging that the deviation characteristic condition is met when the deviation values are all larger than the deviation threshold value within a preset duration and the change rate of the deviation values with time is the same as the change rate sign of the environmental state parameters with time; And S42, when the environmental state parameter is larger than the environmental temperature threshold value, judging that the environmental overrun condition is met.
6. The method according to claim 1, wherein in step S6, when it is determined that the sensor has measurement drift, replacing the second operation parameter with the theoretical reference value is used as a basis for evaluating the state of the central air conditioning equipment, and the method comprises the steps of: and S61, when the sensor is judged to have measurement drift, shielding real-time reading of the sensor, replacing the second operation parameter with the theoretical reference value, and carrying out fault diagnosis based on fault diagnosis rules.
7. The method for managing operation and maintenance data of a central air conditioner according to claim 1, wherein in step S6, outputting equipment failure warning information according to a comparison result of the theoretical reference value and a preset operation threshold value comprises the steps of: and S62, outputting early warning information of insufficient refrigerant and outputting prompt information of unreliable sensor reading when the theoretical reference value is lower than the preset operation threshold value.
8. The method for managing operation and maintenance data of a central air conditioning unit according to claim 1, wherein before step S3, the method further comprises the steps of: S301, acquiring a load fluctuation characteristic value of the central air conditioning equipment, wherein the load fluctuation characteristic value is used for representing the stability of the thermodynamic state of the central air conditioning equipment; s302, judging whether the load fluctuation characteristic value is in a preset steady-state operation interval or not; S303, if the load fluctuation characteristic value is in the steady-state operation interval, executing a step S3; And S304, if the load fluctuation characteristic value is not in the steady-state operation interval, amplifying and compensating the deviation threshold value in the deviation characteristic condition according to the load fluctuation characteristic value, or executing the step S3 after prolonging the preset duration in the deviation characteristic condition.
9. The method for managing operation and maintenance data of a central air conditioner according to claim 8, wherein step S302 comprises: S3021, extracting time domain distribution characteristics of each operation variable in the first operation parameter set in a preset time window, and obtaining a frequency instruction change rate of a compressor in the central air conditioning equipment; s3022, when the parameter variance in the time domain distribution characteristic is smaller than a preset steady state variance threshold and the frequency instruction change rate is smaller than a preset variable frequency steady state threshold, judging that the load fluctuation characteristic value is in the steady state operation interval, otherwise, judging that the load fluctuation characteristic value is not in the steady state operation interval; Wherein the parameter variance comprises a chilled water inlet and outlet water temperature difference variance and a cooling water inlet and outlet water temperature difference variance.
10. A central air conditioning plant operation and maintenance data management system for implementing the steps of the method according to any of the previous claims 1 to 9, said system comprising: The parameter acquisition module is used for acquiring a first operation parameter set of the central air conditioning equipment and acquiring a second operation parameter to be checked, which is measured by a sensor, wherein the first operation parameter set comprises a plurality of operation variables with thermodynamic association relation with the second operation parameter; the environment monitoring module is used for acquiring environment state parameters of the position of the sensor; The theoretical calculation module is used for calculating by utilizing a preset equipment thermodynamic equilibrium model based on the first operation parameter set to obtain a theoretical reference value corresponding to the second operation parameter, and calculating a deviation value of the second operation parameter and the theoretical reference value; the condition judging module judges whether the deviation value meets a preset deviation characteristic condition or not and judges whether the environmental state parameter meets a preset environmental overrun condition or not; The drift judging module is used for judging that the sensor has measurement drift if the deviation value meets the deviation characteristic condition and the environmental state parameter meets the environmental overrun condition; And the early warning output module is used for replacing the second operation parameter by the theoretical reference value to serve as a central air conditioning equipment state evaluation basis under the condition that the sensor is judged to have measurement drift, and outputting equipment fault early warning information according to a comparison result of the theoretical reference value and a preset operation threshold value.

Description

Operation and maintenance data management method and system for central air conditioning equipment Technical Field The application relates to the technical field of air conditioner operation and maintenance data management, in particular to a method and a system for managing operation and maintenance data of central air conditioning equipment. Background In an industrial production environment, central air conditioning equipment needs to accurately control temperature and humidity and ensure stable operation of the equipment, an operation data management method is generally deployed, and monitoring, early warning and energy efficiency optimization are realized by collecting data such as refrigerant pressure, temperature, compressor current and the like in real time. However, in a high temperature reaction place, if the pressure sensor is close to a heat source, when the local ambient temperature continuously rises and exceeds the design range of the sensor, the physical characteristics of the sensitive element in the sensor change, and systematic measurement deviation is generated, namely, the output pressure continuously exceeds an actual value, and the deviation increases with the rise of the temperature. The existing data cleaning logic mainly aims at anomalies such as random noise, transient peaks and the like, can not identify the slow and stable deviations, and considers the deviations as normal data to be included in analysis. The fault diagnosis rule base frequently misjudges that the refrigerant charge is too high based on the high data, and the like, gives false early warning and causes the alarming fatigue of operation and maintenance personnel. Inexperienced persons may accordingly draw refrigerant away by mistake, resulting in an actual refrigerant shortage in the system. Because the output of the sensor is still higher, the actual pressure drop is covered, the system displays that the pressure is normal, and any early warning is not triggered. Meanwhile, the refrigerating efficiency is reduced due to insufficient refrigerant, the compressor runs under high load for a long time, abrasion and overheat risks are increased, the compressor possibly fails in advance, the operation and data management method always fails to identify the real fault, and the equipment is in a sub-health state and has no effective alarm. In view of the above, there is a need in the art for improvements. Disclosure of Invention In view of the defects of the prior art, the application provides the operation and maintenance data management method and system for the central air conditioning equipment, which have the advantages of effectively identifying the measurement drift of the sensor, avoiding misjudgment and misoperation and ensuring the stable operation of the equipment. In a first aspect, a method for managing operation and maintenance data of a central air conditioning device, the method comprising the steps of: S1, acquiring a first operation parameter set of central air conditioning equipment and acquiring a second operation parameter to be checked, which is measured by a sensor, wherein the first operation parameter set comprises a plurality of operation variables with thermodynamic association relation with the second operation parameter; S2, acquiring environmental state parameters of the position of the sensor; S3, calculating by using a preset equipment thermodynamic equilibrium model based on the first operation parameter set to obtain a theoretical reference value corresponding to the second operation parameter, and calculating a deviation value of the second operation parameter and the theoretical reference value; s4, judging whether the deviation value meets a preset deviation characteristic condition or not, and judging whether the environmental state parameter meets a preset environmental overrun condition or not; S5, if the deviation value meets the deviation characteristic condition and the environmental state parameter meets the environmental overrun condition, judging that the sensor has measurement drift; and S6, under the condition that the sensor is judged to have measurement drift, replacing the second operation parameter by using the theoretical reference value as a central air conditioning equipment state evaluation basis, and outputting equipment fault early warning information according to a comparison result of the theoretical reference value and a preset operation threshold value. Further, in step S1, the first operation parameter set includes a chilled water inlet and outlet water temperature, a cooling water inlet and outlet water temperature, a water pump flow rate, and a compressor power, and the second operation parameter is a refrigerant pressure. Further, step S2 includes: S21, acquiring local environment temperature data of the position of the sensor through an environment monitoring unit or acquiring operation temperature data of heat source equipment adjacent to the sensor throu