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『Calculation formula for flow rate of circulating pump』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)
1. Small flow metering pump
2. How to choose a circulating pump for a heat exchange station
The core of choosing a circulating pump is to match the system flow and head, while ensuring efficient and energy-saving operation The selection of core parameters for circulating pumps must be based on hydraulic calculations, mainly determining two key parameters: • Flow rate (m ³/h): calculated based on heating area and heat load. The formula is G=0.86 * Q/Δ t, where Q is the total heat load (kW) and Δ t is the temperature difference between the supply and return water (usually taken as 8-10 ° C). For example, for a 100000 square meter residential building (with a thermal index of 50W/㎡), when the temperature difference is 10 ° C, the flow rate is approximately 0.86 * (100000 * 50/1000)/10=430 m ³/h. Head (m): Overcoming the total resistance of the heat exchanger, pipeline, valve, and user system requires detailed calculation. The resistance inside the station is generally 8-15m, while the resistance of the external network and user systems needs to be calculated based on the length, diameter, and local resistance coefficient of the pipeline network. The total head is usually 20-40m
2. The Q-H performance curve of the selected pump at the front line and working point of the water pump performance curve should be flatter, and the operating efficiency should be the highest near the system design flow point (it should be in the high-efficiency zone of the water pump, usually requiring an operating efficiency of not less than 90% of the maximum efficiency of the water pump). It is necessary to draw a system characteristic curve, and the intersection point with the Q-H curve of the water pump is the working p
4. Configuration plan • One in use and one backup: the most common configuration to ensure reliability. Dual use and one backup: used for large or important systems, with high operational flexibility. -Adopting frequency conversion control: Currently, the mainstream solution is to adjust the water pump speed through a frequency converter to adapt to load changes, with significant energy-saving effects, which can save 30% -50% of electricity. Brand and quality key points - choose well-known brands (such as Grundfos, Weile, Kaiquan, Southern Pump Industry, etc.) to ensure efficiency and reliability. -Pay attention to the NPSHr, which must be less than the NPSHa of the device to prevent cavitation. -The material of the pump body (such as cast iron, stainless steel) must meet the requirements of water quality and temperature. -The motor protection level shall not be lower than IP54, and the insulation level shall be F.
What size of heating pipeline circulation pump is needed for a building area of 3.360 square meters?
For a building area of 360 square meters, it is recommended to choose a heating pipeline circulation pump with a power of 180W-540W and a flow rate and head calculated according to