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Why is the flow meter on the air conditioning pipeline smaller than the main pipeline? The diameter of the flow meter on the air conditioning pipeline is smaller than that of the main pipeline, mainly to adapt to the flow measurement principle, optimize system efficiency, and reduce costs. It is a common and reasonable configuration in engineering design.
1. Core Logic of Flow Meter Selection and Pipeline Adaptation 1 The principle of flow measurement limits the use of vortex flowmeters, turbine flowmeters, etc. in most air conditioning systems, and their optimal measurement accuracy needs to meet the requirement that the fluid inside the pipeline is in a state of "fully developed turbulence" (Reynolds number Re ≥ 4000). If the diameter of the flowmeter is consistent with the main pipeline, when the system is under low load (such as at night or when some rooms are closed), the fluid flow velocity will significantly decrease (possibly below 0.5m/s), resulting in a sharp increase in measurement error (even undetectable). Reducing the diameter of the flow meter can increase local flow velocity (for example, if the main pipeline diameter is 100mm and the flow meter is 80mm, the flow velocity can be increased by about 50%), ensuring that turbulent conditions are met under most working conditions and measurement accuracy is guaranteed. 2. The total resistance of the air conditioning water system should be controlled within a reasonable range (usually requiring a total resistance of ≤ 50kPa) to balance system pressure loss. If the diameter of the flowmeter is too large, it will cause the flow velocity to be too low due to the large flow area, and instead increase the resistance along the way (the flow velocity is pro
2. Practical considerations for engineering design 1 The cost and installation convenience of flow meters increase exponentially with the increase of pipe diameter (for example, the price of DN150 vortex flow meters is 2-3 times that of DN80). Choosing a flow meter with a smaller diameter can significantly reduce equipment costs, and small-sized flow meters are more convenient to install in computer rooms with dense pipelines. The flow range covers the demand for air conditioning systems, and the flow variation range is usually large (such as the flow rate at full load being the rated value, and may drop below 30% at low load). Small diameter flow meters can expand the effective measurement range (for example, the range of DN80 flow meters is 10-100m ³/h, while the range of DN100 flow meters is 20-200m ³/h), which is more suitable for the variable flow operation requirements of the system.
III. Precautions for Installation and Debugging 1 Regardless of whether the pipe diameter is the same, sufficient straight pipe sections (usually 10D in the front and 5D in the back, where D is the diameter of the flow meter) should be reserved before and after the flowmeter to avoid flow field disturbances caused by pipe bends, valves, etc. affecting the measurement. If the diameter of the pipe is reduced, a smooth transition should be made through a variable diameter joint (to avoid sudden shrinkage/expansion), othe