Variable flow system is in the terminal equipment ( Such as fan coil, combined air conditioning box, air processor, etc. ) Adding electric control valve, the indoor temperature controller to adjust electric 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 valve opening, there is no guarantee that the flow of change are allocated in accordance with the requirements, so must have the corresponding control equipment, can make the system work efficiently. In a 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 valve and terminal device can meet the actual requirements of the design flow. Balance control circuit; Ensure control valve operation in good working condition. In order to improve the control precision of the system, to achieve the stable operation of the system. All control equipment are calculated by the system designer Kvs values. All pumps should provide accurate pump head. All equipment at the end of the pressure drop to accord with the requirement of the designer. In the actual application can only be in the standard model selection control valve, water pump and terminal device, etc. Control Industrial Valves control valve: most manufacturer Kvs values, each Kvs value is about 60% higher than the previous one, and therefore is unlikely to choose to fit for requirement of Kvs values. Water pump: due to the model, for the selection of pump flow may differ with required 10 ~ 40%. In order to ensure sufficient flow rate, pump usually choose 25% 10% higher than required sometimes. Fan coil units and other terminal equipment, these devices can only be selected according to the market supply, in fact, no one can choose smaller models of fan coil units and terminal equipment, because of the risk of low flow. In short, in order to avoid traffic and improve the stability of the system. Application of self-help type differential pressure control valve can easily be limited in order to achieve maximum flow rate in the design flow. In the end the use of electric control Industrial Valves, although after careful calculation, you will find the required Kvs value of control valve can not be found in the market, the results are most of the control valve is too large. In many cases, the control valve is fully open. For example: in the boot process; The drastic fluctuations; In the heating water temperature is too low, In the cooling water temperature is too high) ; Temperature control device for maximum or minimum; Or fan coil is too small, etc. In these cases, when there is no balance equipment control, will appear in some loop flow, while in other circuits in less flow would happen. Fluid circulation heating or cooling system is through the balance Industrial Valves according to the requirements of strict precision, the control system of changing flow, to building the parts with the optimal efficiency of adequate supplies of heating or cooling capacity. And reduce energy consumption, make get comfortable uniform temperature throughout the building, to create comfortable indoor environment. Balancing valve in air conditioning system and balance the loop resistance, a constant and the role of traffic regulation, which promote the system in the most economic flow rate of the operation, to guarantee satisfactory output air terminal devices. It is, therefore, can improve the transmission efficiency of energy-saving air conditioning water system components. Balancing valve's primary role is to ensure that the system is run according to the technical parameters, and the designer's intent. Balance in the process of debugging, can find and eliminate some threat to the system function, including the implementation of the incorrect balance calculation, and the sheer installation errors, such as the wrong check valve or filter blocked, pump head is too big, and so on. Hvac online in the process of balance can be immediately found the problem, find the root cause and take corrective measures, such as far as possible at the lowest energy costs, ensure system to provide the best comfort.
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