Variable static pressure and total air volume dual control policy of VAV variable-air-volume system

A dual control, total air volume technology, applied in heating and ventilation control systems, heating and ventilation safety systems, noise suppression, etc. Slow response speed and other problems, to avoid system air volume imbalance, avoid system temperature imbalance, stable and reliable operation

Inactive Publication Date: 2017-12-29
蒋一峰
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AI Technical Summary

Problems solved by technology

The constant static pressure control method cannot scientifically determine the static pressure point and the constant static pressure value in theory, and is often replaced by the return air temperature control in practice, so it will be eliminated
However, the air supply temperature generated by the variable static pressure control method is low, which affects the comfort effect, the system response speed is slow, and the communication speed is low.

Method used

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  • Variable static pressure and total air volume dual control policy of VAV variable-air-volume system
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  • Variable static pressure and total air volume dual control policy of VAV variable-air-volume system

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Embodiment Construction

[0018] The present invention will be further explained below in conjunction with specific embodiments.

[0019] refer to figure 1 , it can be seen that the actual speed f = f 1 +Δf 2 , f 1 = f 0 +Δf 1 , to determine the actual speed f, the key lies in how to determine f 0 and Δf 1 , Δf 2 . where f 0 and Δf 1 Determined by the total air volume control method, △f 2 Determined by variable static pressure control method.

[0020] (1) Predicted speed f 0 Determination - frequency division method.

[0021] In theory f 0 The determination should be obtained from the L-f curve of the inverter air conditioner fan (that is, flow and frequency), but in actual engineering, this curve does not exist. This is especially serious in the variable air volume air conditioning system, because the air valve opening of the VAV is always changing, and the pipeline characteristic curve is also changing "disorderly and frequently". Theoretically determine its operating point.

[0022]...

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Abstract

The invention discloses a variable static pressure and total air volume dual control policy of a VAV variable-air-volume system. The prominent energy conservation of variable static pressure and the advancement and the directness of total air volume are combined; the designed rotating speed of a total air volume method is continuously corrected through a variable static pressure method to achieve the better energy saving effect; the rotating speed f1 calculated by the total air volume method is set to be the initial rotating speed to finish the primary control; and the initial rotating speed is corrected according to valve position feedbacks phi of terminal devices of all variable air volume air conditioning systems to finish secondary control. The policy can guarantee stable and reliable operation in the effective range of the equipment life, and can guarantee comfort and energy conservation.

Description

technical field [0001] The invention relates to a method for controlling air volume of a central air conditioner, in particular to a dual control strategy of variable static pressure and total air volume of a VAV variable air volume system. Background technique [0002] The air volume control method of the variable air volume system is one of the key technical links to determine whether the system can run successfully. It is considered that the more traditional methods include constant static pressure control strategy and variable static pressure control strategy. The so-called constant static pressure method is to install a static pressure sensor at an appropriate position (usually 2 / 3 away from the fan) of the air supply system pipe network. Change the air supply volume of the air conditioning system. The so-called variable static pressure method is to keep the valve at the end of each VAV between 85%-100%, even if the valve is fully opened as much as possible and the st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24F11/00F24F13/24
CPCF24F13/24F24F2013/247
Inventor 霍小平
Owner 蒋一峰
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