Analysis of the balance of the application of pneumatic valve in air conditioning and heating system

content introduction: hvac refrigeration and heating, air conditioning system of energy saving is a very important part of building energy efficiency. And balance the pneumatic valve is one of the key to energy saving of heating, refrigeration system equipment.

it is a key equipment of function mainly reflects in the following aspects:

. Implement key components of hydraulic balance in the cold, hot water system.
　　
　　. Thousands of project practice also proved that the effect of balanced pneumatic valve is air conditioning, heating system energy efficiency, reducing energy consumption, reduce the project cost to ensure safe and reliable operation, the user satisfaction of one of the indispensable important equipment in the system.
　　
　　. Balanced pneumatic valve is air conditioning metering heating system is one of the indispensable important equipment.

balance type pneumatic valve performance description:

in the air conditioning and heating system, as the energy distribution of the water cycle system of hydraulic balance is very important. A balance of hydraulic system is to meet user requirements, the basis of energy saving. In the air conditioning and heating system, cold ( HTM by closed pipeline system distribution to each user. For a well-designed piping systems, each user in the end of the pneumatic control valve ( Electric pneumatic valve, pneumatic control valve opening for % should be to get the design of water, and at the end of each user control of pneumatic valve opening change when can get the required flow and mutual interference. The water system is a hydraulic balance system, otherwise it is unbalanced hydraulic system, hydraulic imbalance is also called the hydraulic imbalance.

hydraulic disorder generally divided into two kinds of static imbalance and dynamic disorder. The so-called static disorder is also known as steady disorder. The system, each user under design condition, actual traffic does not accord with the design discharge. This kind of hydraulic imbalance is fundamental, if not solved, always there. For constant flow system, the disorder can use static balance pneumatic valve or pneumatic valve to solve dynamic balance, the difference is that the former need adjusted instrument, while the latter does not need to. Dynamic disorder is also known as stability disorder. The system, the change of chilled water when some users ( Closed or adjustment, will cause the resistance distribution of system changes, resulting in the flow of other users with the change. The hydraulic imbalance is random and dynamic change. The disorder phenomenon of static balance pneumatic valve can not solve, can only be used to solve the dynamic balance of pneumatic valve. For example, a building of six storeys, such as the dynamic flow balance of pneumatic valve not installed, the water system in the actual operation of dynamic imbalance. In air conditioning cooling season, 1 ~ 2 room is too cold, 3 ~ 4 layers just reached design comfortable room temperature, 5 ~ 6 layer room is too hot. On the other hand, during the heating season, the first to second floor room will be too hot, 3 ~ 4 layers just reached design comfortable room temperature, 5 ~ 6 layer room is too cold. Dynamic flow balance after pneumatic valve installation, whether using a ~ 6 layer room all or only part in air conditioning room, all rooms can meet the design temperature.

balance the application of pneumatic valve on the air conditioning system:

variable flow system is in the terminal equipment ( Box combination such as fan coil, air conditioning, air processor such as adding electric regulating pneumatic valve, by indoor temperature controller to adjust the electric pneumatic valve opening, to independently regulate by the flow rate of the coil to ensure indoor temperature fluctuations within the scope of the permit. Change in the flow system by adding on the water pump frequency converter speed. At the same time, we must pay attention to the change of the pneumatic valve opening, there is no guarantee that changes in the flow are allocated in accordance with the requirements, so must have the corresponding control equipment, can make the system work efficiently.

in the variable flow operation of the system, the control equipment is mainly to solve three problems. Balance system of cold source side loop; Through the chiller water flow for the fixed value. Balancing system distribution side loop; Ensure any load cases all control of pneumatic valve and terminal device can meet the actual requirements of the design flow. Balance control circuit; Ensure control the operation of pneumatic valve is in good working condition.