Evolution of the regulation of HVAC systems

Heating project pipe network design standard
2019-09-25
Shijiazhuang Warm Sun Heating Service Co., Ltd. visited Hebei Tongli Company
2019-09-29
The most fundamental goal of HVAC systems is to achieve environmental temperature control to meet people's environmental comfort and some process requirements. In the early HVAC systems, 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, such as adjusting the air volume of the fan coil and adjusting the air volume through variable air volume by using a three-speed switch. The box 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. With the demand for environmental comfort and the increasing awareness of energy conservation, this adjustment has not been able to meet the requirements. 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. It can also be connected with the building control system to form a central control system with decentralized control and centralized management, thus greatly improving the system. The ability to regulate the temperature of the environment.
However, in some variable flow systems with large system load fluctuations, 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 resistance of the electric regulating valve itself The interference capability is relatively poor, which causes the entire system to be unstable, the ability to regulate the ambient temperature to decrease, and the adjustment accuracy to decrease.
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 comprehensive balance of hydraulic systems is also being adopted by more and more large variable flow water systems due to its efficiency, stability and energy saving.

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