Application of Balance Valve in Air Conditioning System
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April 14 15:07:29, 2023
Balance valve in the air conditioning system Variable flow system is in the end equipment (such as fan coil, combination air conditioner, air handler, etc.) to add electric control valve, the indoor temperature controller to adjust the opening of the electric valve from The main regulator through the coil of the flow, thus ensuring the indoor temperature fluctuations within the allowable range. The change of the system flow is realized by adding the frequency converter on the pump to adjust the speed. At the same time, we must note that the valve opening changes, and can not guarantee the flow of change in accordance with the requirements of the allocation, so there must be appropriate control equipment to make the system more efficient operation. In variable flow operation of the system, the control device to solve three problems. 1. Balance the system cold source side of the loop; so that the water flow through the chiller unit is fixed. 2. Balance the system side of the transmission ring; to ensure that all load cases, control valves and end devices to meet the actual requirements of the design flow. 3. Balance control loop; ensure that the control valve is operating under good working conditions. In order to improve the control accuracy of the system, to achieve stable operation of the system. Must meet the following requirements: 1. All control devices have Kvs values ​​calculated by the system designer. 2. All pumps should provide accurate pump head. 3. The pressure drop across all end devices meets the designer's requirements. In practical applications, only control valves such as control valves, water pumps and end devices can be selected in the standard models. Kvs values ​​of most manufacturers' control valves are about 60% higher than the previous gear, making it not likely to be selected Just for the Kvs value required. Pump: Depending on the model, the flow rate of the pump for selection may differ from the requirement by 10 to 40%. In order to ensure adequate flow, the pump is usually selected to use 10% higher than the sometimes up to 25%. Fan Coil and Other End Devices: These devices are also available only for market availability. In fact, no one is going to choose a smaller fan coil and end device because of the risk of under-flow. In short, in order to avoid excessive traffic, improve system stability. The application of self-operated pressure control valve can easily limit the maximum flow to achieve the design flow. HVAC - AIR CONDITIONING - Online At the end, electric control valves are used, although after careful calculation, you will find that the required control valve for Kvs is not available in the market. As a result, most control valves are oversized. In many cases, the control valve should be fully open. For example: in the start-up process; a major fluctuations; heating supply water temperature is too low (refrigeration supply water temperature is too high); temperature control device is the maximum or minimum; or fan coil is too small. Under these conditions, overcurrent will occur in some circuits and undercurrent in other circuits when there is no balance in equipment control. Fluid circulation heating or cooling systems control the flow of the system through rigorous and precise control of balancing valves to provide adequate heating or cooling capacity to all sections of the building with optimal efficiency. And reduce energy consumption, so that the entire building to get a comfortable uniform temperature, creating a comfortable indoor environment. Balance valve in the air-conditioning system plays a balance of the resistance of the loop, constant and regulate the flow of the role, which promotes the system to run at the most economical flow to ensure that air-conditioning terminal equipment to obtain satisfactory output.