Overheat fault diagnostic detecting method and device for room with ground source heat pump central air-conditioning system

Abstract

The invention discloses overheat fault diagnostic detecting method and device for a room with a ground source heat pump central air-conditioning system. Firstly, storage standard parameters are input into a testing system according to the climatic index of a use region; then, overheat fault diagnostic detecting is carried out according to the fault tree of the overheat fault diagnostic function. The invention has the advantages of great logicality, simplicity, clarity and strong man-machine communication capability, as well as can rapidly and accurately find out the cause of the fault, greatly shorten the time of fault recovery, and predict the fault to a certain extent.

Description

Technical field [0001] The invention relates to a method for fault diagnosis of a ground-source heat pump central air-conditioning system, in particular to a device with an "overheating" fault diagnosis function for an air-conditioned room and a diagnosis method thereof. Background technique [0002] With the development of society, people's living standards continue to improve, and people have higher and higher requirements for thermal comfort. As the creator of the indoor thermal comfort environment, the central air-conditioning system is taking on more and more heavier tasks. Therefore, the air-conditioning system has become extremely complex and faults emerge in an endless stream, which brings severe challenges to fault diagnosis. When investigating office buildings in a certain city, the author found that there are still split air conditioners and electric fans in air-conditioned rooms that use central air-conditioning. This phenomenon is not uncommon, indicating that the "o...

AI Technical Summary

Problems solved by technology

[0008] 1. A fault history database (including fault manifestations and fault causes) is required, which is not applicable to systems without a fault history database;

[0009] 2. Faults only analyze the intermediate events and bottom events that may lead to fault events caused by hardware errors and operation errors; there are many types of faults, and hardware errors and operation errors are only part of them. For soft faults, this method loses its function;

[0010] 3. The fault tree established by this method is a binary tree. There are many causes of faults, and the binary tree is difficult to completely include. Once the tree is incomplete, the fault search will fail;

[0011] 4. The object of diagnosis is communication electronic equipment, and there is nothing that can be done about the failure of the central air-conditioning system

Although this method establishes a set of fault diagnosis methods for central air-conditioning systems, the conclusion can only be obtained after offline analysis in university laboratories. The time from fault discovery to troubleshooting will inevitably increase, and the efficiency of fault diagnosis is not high, which affects normal use.

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