Variable air volume air-conditioner control system with variable frequency fan and digital air valve for adjusting tail end air volume and implementation method

Abstract

The invention discloses a variable air volume air-conditioner control system with a variable frequency fan and a digital air valve for adjusting tail end air volume and an implementation method, belonging to the technical field of the control of a variable air volume air-conditioner system. The variable air volume air-conditioner control system structurally comprises a master station DDC (direct digital control) controller, a tail end temperature controller, a filed bus, a tail end variable air volume box (VAV-BOX) and an air valve driver, comprises mater station DDC control and tail end temperature controller control in control types, and adopts a strategy of collective processing at first and decentralized control later. Through a method for adjusting the tail end air volume by the variable frequency fan and the digital air valve, the variable air volume air-conditioner system eliminates throttle energy loss of the air valve without a device for measuring the air volume, has simple control type and no influence on the operation of the whole variable air volume system, and has the advantages of good system stability and obvious energy-saving effect; and the fault on the variable air volume tail end device of certain node has no influence on the normal operation of other variable air volume tail end devices.

Description

Technical field [0001] The invention relates to a variable air volume air conditioner control system, in particular to a variable air volume air conditioner control system with a variable air volume terminal device, a variable frequency fan and a digital air valve to adjust the terminal air volume, and a realization method thereof. The utility model belongs to the field of the variable air volume air conditioning system and is used in the variable air volume air conditioning system of building automatic control. Background technique [0002] Since the energy consumption of central air-conditioning occupies a significant proportion in building energy consumption, people pay more and more attention to energy-saving technology of air-conditioning. As an energy-saving and efficient air conditioning system, the variable air volume air conditioning system (VAV) uses the variable air volume terminal device to adjust the air volume sent into the room or the mixing ratio of fresh ret...

AI Technical Summary

Problems solved by technology

However, the total air volume control increases the degree of coupling between terminals, and the VAV control system and operation management are more complicated. When the control fails, it will lead to unstable system operation, poor air conditioning quality, and insignificant energy saving effects. The popularization has brought serious obstacles, and even many VAV systems have to operate in the form of a constant air volume system during actual operation, resulting in a great waste of initial investment and operating costs

Due to technical and economical reasons, the popularization and application of control systems currently used in variable air volume air conditioners is limited

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