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What are the flow regulation methods for metering pumps?
2. Calculation formula and steps for pipeline flow rate
Calculation formula and operation process for pipeline flow rate: For pressurized pipe flow: Calculate the pipeline specific resistance S: For old cast iron refractory limb pipes or old steel pipes, the Chevrolev formula s=0.001736/d ^ 5.3 or s=10.3n2/d ^ 5.33 can be used for calculation, or relevant tables can be consulted for information.. Determine the hydraulic head difference H: H=P/(ρ g), where P is the pressure difference at both ends of the pipeline, ρ is the fluid density, and g is the gravitational acceleration. Calculate flow rate Q: Use the formula Q=(H/sL) ^ (1/2), where L is the length of the pipeline. Calculate flow velocity V: Use formula V=4Q/(3.1416d ^ 2). For short pipelines (where local resistance and flow head cannot be ignored): The calculation formula for flow rate Q is Q=[(π/4) d ^ 2 √ (1+λ L/d+Zeta)] √ (2gH). Parameter description: π is pi; D is the inner diameter of the tube; L is the length of the pipeline; Changshi g is the acceleration due to gravity; H is the head difference at both ends of the pipeline; λ is the resistance coefficient along the pipeline; Zeta is the local resistance coefficient of the pipeline (to be accumulated). Pay attention to specific factors: In practical applications, appropriate formulas should be selected for calculation based on the specific situation. The parameters in the formula need to be determined according to the actual situation to ensure the accuracy of the calculation. For different types of pipelines and fluids, other factors such as fluid viscosity, pipeline material, and roughness may need to be considered for more
3. How to calculate the flow rate of heating pipes
Calculation formula: G=0.86 * Q/Δ t, where
1. G: flow unit L/h, Q: heat load unit W, Δ t: supply and return water temperature difference unit ℃, 0.86: can be regarded as a constant.
.2、 Calculation key for heat load: Q=heating area (㎡) * unit area heat index (W/㎡) Example:
1. 430kw=0.43MW, converted to heat: 368571 kcal, rounded to 370000 kcal;
2、 The circulating water volume is 370000 kcal/10 degrees=37000 kg/hour (flow rate);
4、 The economic flow rate of heating pipes is about 2.5 meters per second;
5、 Calculation of pipeline diameter: a. Flow rate=pipeline cross-sectional area X water velocity X 3600 seconds=area X 2.5 meters/second X 3600 seconds X 1 ton/cubic meter=37 tons/hour;
6、 Area=0.0041 square meters; The diameter of the pipeline is 0.072 meters, which is 72 millimeters. It can be rounded to DN80 and can be used with a diameter of Φ 89 Additional information:
1. Calculation of actual heating area heat index:
1. In order to make the actual heating area heat index comparable to the planned area index, the actual heating area heat index at different outdoor temperatures needs to be corrected to the same conditions as the planned area index, that is, to meet the users indoor temperature of 18 ℃ at an average outdoor temperature of -12 ℃.
2、 Actual heating area heat index: qf actual=qf/Φ
3. In the equation, qf is actually the actual heating area heat index of the building, W/m2； QF is the heat index of the heating area of a building, W/m2； 2. Heating flow rate is calculated based on heating area and temperature difference example:
1. Heating pipe