An effective and energy saving heating system needs many control devices, such as flow controllers and differentialpressure controllers.
每一个有效节能的供热系统都配有相应的调节控制设备，如自力式流量控制阀、压差控制阀等。
2
The PCOP of the chilled water loop using constant differentialpressurecontrol strategy is discussed and an example is given in the end.
此外还讨论了利用定压差控制的集中空调水系统的PCOP值，并给出一个分析算例。
3
Constant orifice differentialpressure is the premise for high accuracy hydraulic measuring, so thorough analyse of orifice differentialpressurecontrol technology has been taken.