简介：

暖通空调是具有采暖、通风和空气调节功能的空调器。由于暖通空调的主要功能包括：采暖、通风和空气调节这三个方面，缩写HVAC(Heating,Ventilating and Air Conditioning)，取这三个功能的综合简称，即为暖通空调。

在现代的建筑中，上述机能（包括其控制系统，及系统的设计及安装）会整合在一个或多个的暖通空调系统中。针对小型的建筑，承包商会直接依需求选择暖通空调系统及设备。若是大型的建筑，会由建筑设计者及机械、结构等工程师共同分析、设计并选定暖通空调系统，再由专业的机械承包商来安装。

暖通空调系统根本的目标是实现对环境温度的调控，以满足人们对环境舒适度以及一些工艺性的要求。

在早期的暖通空调系统中，一般采用定流量水力系统，通过对末端设备风量的分档控制来实现对目标区域环境温度的调节，如采用三速开关调节风机盘管风量以及通过变风量空调箱进行风量调节等。这种调节是简单、粗略以及分散式的，且在系统初调试合格后不需再对水力系统进行调节。

随着人们对环境舒适度的要求以及节能意识的不断提高，这种调节已经不能满足要求。于是人们开始采用变流量水力系统以及变风量系统，通过电动调节阀或风阀执行器对系统的水量或风量进行连续调节来实现对环境温度的精确控制。

电动调节阀既可以通过与各种传感器、变送器以及控制器相连组成分散式的控制系统，也可以与楼宇控制系统相连组成分散控制、集中管理的中央控制系统，从而大大地提高了系统对环境温度调控的能力。

但是在一些系统负荷波动较大的变流量系统中，由于多台电动调节阀同时工作，任何一台电动调节阀工作状态的改变都会对其它的电动调节阀产生影响，而电动调节阀本身的抗干扰能力又比较差，从而造成了整个系统不稳定，对环境温度的调控能力下降，调节精度降低。

因此在目前的一些大型变流量中央空调水系统中，一种具有较强抗干扰能力的新型调节阀—动态平衡电动阀得到越来越广泛的应用。

同时，一种全新的全面平衡水力系统，也因其高效、稳定和节能而被越来越多的大型变流量水系统所采用。

HVAC is an air conditioner with heating, ventilation and air conditioning. Since the main functions of HVAC include: heating, ventilation and air conditioning, the abbreviation HVAC (Heating, Ventilating and Air Conditioning), the comprehensive abbreviation of these three functions, namely HVAC.

In modern buildings, these functions (including their control systems and system design and installation) are integrated into one or more HVAC systems. For small buildings, the contractor will select the HVAC system and equipment directly according to the needs. In the case of large-scale buildings, the architects and engineers, mechanical and structural engineers will analyze, design and select the HVAC system, which will be installed by professional mechanical contractors.

The most fundamental goal of HVAC systems is to achieve environmental temperature control to meet environmental comfort and some process requirements.

In the early HVAC system, a constant-flow hydraulic system was generally used to adjust the ambient temperature of the target area by controlling the air volume of the end equipment. For example, a three-speed switch was used to adjust the fan coil air volume and pass The variable air volume air conditioner performs air volume adjustment and the like. This adjustment is simple, coarse and decentralized, and there is no need to adjust the hydraulic system after the initial commissioning of the system.

As people's demands for environmental comfort and awareness of energy conservation continue to increase, this adjustment is no longer sufficient. Therefore, people began to use variable flow hydraulic system and variable air volume system, through the electric control valve or damper actuator to continuously adjust the water volume or air volume of the system to achieve precise control of the ambient temperature.

The electric control valve can be connected to various sensors, transmitters and controllers to form a decentralized control system, or it can be connected with the building control system to form a central control system with decentralized control and centralized management, thus greatly improving The ability of the system to regulate the ambient temperature.

But in some variable flow systems with large fluctuations in system load, since multiple electric regulating valves work at the same time, the change of working state of any one electric regulating valve will affect other electric regulating valves, and the electric regulating valve The anti-interference ability of the system itself is relatively poor, which causes the whole system to be unstable, the ability to regulate the ambient temperature is lowered, and the adjustment precision is lowered.

Therefore, in some large-scale variable-flow central air-conditioning water systems, a new type of regulating valve with strong anti-interference ability-dynamic balancing electric valve has been widely used.

At the same time, a new fully balanced hydraulic system is also being adopted by more and more large variable flow water systems due to its efficiency, stability and energy efficiency.

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