Variable static pressure control method and system for variable air-conditioning system

Abstract

The invention discloses a static-pressure variable control method of wind-variable air conditioning system, which comprises several wind-variable terminal with valve feedback parallel connected on one wind tube of air conditioner which has a fan frequency changer and a wind tube static pressure sensor on the wind tube, while the sensor is connected with one input of controller. The output of controller is connected to the fan frequency changer. The wind-variable terminal is connected to another input of controller. Or the air conditioner has several wind tubes while each tube is arranged with a wind tube static pressure sensor. The invention can adjust the fan frequency via the static pressure of wind tube, to realize stable and reliable control, while it can reduce the static pressure via the valve signal of wind-variable terminal at local load, to save energy.

Description

technical field [0001] The invention relates to the field of air conditioning and ventilation, in particular to a variable static pressure control method and system of a variable air volume air conditioning system. Background technique [0002] The variable air volume air conditioning system is an all-air air conditioning system that meets the indoor load changes by changing the air supply volume. The system has good energy saving and comfort, meets users' good requirements for indoor air quality, and is widely used in various buildings such as office buildings, hospitals, libraries and gymnasiums. [0003] When the air-conditioning load changes in the variable air volume air conditioning system, the variable air volume terminal device adjusts the opening of the valve to change the air supply volume of the air conditioner to meet the indoor load change, and the change of the valve opening of the variable air volume terminal device causes a change in the static pressure on th...

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Problems solved by technology

[0005] These two control methods have their advantages and disadvantages. The constant static pressure control method and the system have clear control objectives, so the control method is simple and reliable. When the air-conditioning load is small, the valve of the variable air volume terminal device is at a small opening, so the throttling loss of the air valve of the system is large, and the operation is not energy-saving; the variable static pressure control method and the system keep the variable air volume terminal device at a relatively high temperature regardless of the air-conditioning load. Large opening and lower static pressure of the air supply pipe are beneficial to energy saving, but as long as one valve position signal error in the system may cause the entire system to collapse, and the real-time changes of each valve position in the system cause system shock and instability, so the system control complex, less stable

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