Intelligent cooling coil fault detection and diagnosis method and device based on Bayesian reasoning and virtual sensing

Abstract

The invention discloses an intelligent cooling coil fault detection and diagnosis method and device based on Bayesian reasoning and virtual sensing. Based on the heat transfer equation and the energyconservation equation, a target function of virtual sensing of the offset of the temperature sensor and the heat exchange performance of the cooling coil is established; a posterior distribution probability density function of sensor offset and cooling coil heat exchange performance virtual sensing is established through Bayesian reasoning, probability distribution of related parameters is obtained through a Markov chain Monte Carlo method, then the sensor offset is corrected, and the fault level of the cooling coil heat exchange performance is determined. According to the method, measured value data sets of the water side and air side temperature sensors of the cooling coil, which are obtained by real-time measurement, are input into the target function, so that correction results of allparameters are obtained. The result is input into the cooling coil control system, accurate in-situ correction of the offset of the sensor can be achieved, the heat exchange performance fault level ofthe cooling coil can be measured, then faults are removed, and energy-saving and efficient operation of the cooling coil system is achieved.

Description

technical field [0001] The invention belongs to the technical field of intelligent detection and diagnosis of cooling coil system faults, and in particular relates to a method and device for intelligent detection and diagnosis of cooling coil faults based on Bayesian reasoning and virtual sensing. Background technique [0002] In the HVAC system, the cooling coil is used as the medium for cold and heat transfer between the cold and heat source system and the air-conditioning terminal system, providing suitable temperature, humidity and air quality for the indoor environment, and then meeting people's daily life and production requirements. However, the cooling coil system often produces various faults, the fault types mainly include sensor offset and heat transfer performance faults, these faults seriously inhibit the efficient operation of the cooling coil system, thereby increasing a large amount of unnecessary energy consumption . Existing cooling coil system fault detec...

AI Technical Summary

Problems solved by technology

However, the cooling coil system often produces various faults, the fault types mainly include sensor offset and heat transfer performance faults, these faults seriously inhibit the efficient operation of the cooling coil system, thereby increasing a large amount of unnecessary energy consumption

The existing cooling coil system fault detection and diagnosis technology usually only corrects the sensor offset or detects and diagnoses the heat transfer performance fault of the cooling coil

In the actual operation process, due to the influence of factors such as improper installation and maintenance, sensor offset and cooling coil heat transfer performance failure may occur at the same time, resulting in high energy consumption of the cooling coil system

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