Method and device for determining characteristic curve of pipe network

Abstract

The invention discloses a method and device for determining a characteristic curve of a pipe network. A present combination type of circulation equipment in a pipe network water system and a correspondence table between the combination types of the circulation equipment and characteristic parameters of the pipeline are obtained; according to the present combination type of the circulation equipment, a target pipe network characteristic parameter corresponding to the present combination type of the circulation equipment is obtained from the correspondence table; and according to the target pipe network characteristic parameter and a pipe network equation corresponding to the pipe network water system, the pipe network characteristic curve of the pipe network water system is obtained. Thus, a new ideal for determining the pipe network characteristic curve is provided from the aspect of the combination type of the circulation equipment, the target pipe network characteristic parameter corresponding to the present combination type of the circulation equipment can be obtained rapidly and accurately according to the correspondence table, and thus, the pipe network characteristic curve can be determined more efficiently and more accurately.

Description

technical field [0001] The invention relates to the technical field of water pump working condition operation control, in particular to a method and device for determining a characteristic curve of a pipe network. Background technique [0002] Theoretically speaking, the hydraulic working point can be obtained by calculating the point where the working point of the water pump intersects the characteristic curve of the pipe network. However, in the HVAC system, the real-time change of the load will often require the adjustment of the resistance device in the pipeline, and the result of the adjustment will cause the characteristic curve of the entire pipeline network to change. Because the law of this change is very complicated, it is impossible to calculate the characteristic curve of the pipe network in detail, so the hydraulic operating point cannot be calculated, which makes it possible to maintain the pressure difference or increase the lift as much as possible during hyd...

AI Technical Summary

Problems solved by technology

However, in the HVAC system, real-time load changes will often require the adjustment of resistance devices in the pipeline, and the result of the adjustment will change the characteristic curve of the entire pipeline network

Because the law of this change is very complicated, it is impossible to calculate the characteristic curve of the pipe network in detail, so the hydraulic operating point cannot be calculated, which makes it possible to maintain the pressure difference or increase the lift as much as possible during hydraulic adjustment, resulting in energy consumption of the transportation system Remaining high, very unfavorable to the requirements for energy saving

[0003] At present, in order to calculate the hydraulic operating point, usually the characteristic curve of the pipe network is kept unchanged, and a simple proportional law is used for calculation; or it is easier to increase the output of the water pump by adjusting the pressure difference, which will cause a vicious circle

Moreover, for existing open systems and systems with back pressure, the proportional law is completely inapplicable and cannot be simply applied

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