1/11/2024 0 Comments Volumetric flow![]() ![]() It is important to know this in order to be able to make a presetting for the hydronic balancing on the radiator. In the second example we calculate the volumetric flow rate for a radiator. Example Calculation – Calculate Volumetric Flow Rate for Radiators We can now enter the calculated results in the following formula and obtain the flow velocity. Here not the divisor 3,6 is used but 3.600, because cubic meters remain and are not converted into liters (1 hour = 3600 seconds). The flow velocity is to be calculated in m³/h. The flow velocity is to be calculated in m³/s. ![]() Flow velocityįirst, we convert the volumetric flow rate from m³/h to m³/s, since the final result of the flow velocity is to be given in m/s. The pipe cross-sectional area thus amounts to 0.0002 m². We use the following formula and use the given values: The radius resulting from is then 0.8 cm. The inside diameter is used for the calculation. The nominal diameter DN 15 therefore has an outside diameter of = 21,3 mm = 2,13 cm and an inside diameter of = 16 mm = 1,6 cm. ![]() A look at DIN EN 10255 or the nominal width tables of Wikipedia (GER) will help here. To determine the inner diameter and the resulting radius of a medium-weight pipe of DN 15, we have to look into a conversion table (or you know the values by heart). In the next step we calculate the pipe cross-sectional area, which is determined with Pi ( ) and the radius of the pipe. The volumetric flow rate thus amounts to 0.42 m³/h. ⇒ Divisor for conversion: 0.278 ⇒ x l/s / Divisor = y m³/h ⇒ Divisor for conversion: 3.6 ⇒ x m³/h / Divisor = y l/sġ liter/second = 3.6 cubic meters/hour ⇒ Divisor for conversion: 16.67 ⇒ x l/min / Divisor = y m³/hġ cubic meter/hour = 0.278 litres/second ⇒ Divisor for conversion: 0.06 ⇒ x m³/h / Divisor = y l/minġ liter/minute = 0.06 cubic meters/hour Important: The following applies to the conversion into cubic meters/hour or into liters/minute or liter/second:ġ hour = 3600 seconds ⇒ 3600 / 1000 = 3,6ġ cubic meter/hour = 16.67 liters/minute Since the volumetric flow rate is required in the unit m³/h, the result still has to be converted.
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