Refrigeration, air-conditioning and cooling technology - 2007.pdf
Refrigeration, air-conditioning and cooling technology - 2007.pdf
Refrigeration, air-conditioning and cooling technology - 2007.pdf
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PLH_KKK_U2_31.QXP 25.05.2007 11:01 Uhr Seite 16FUNDAMENTALSInstructions for preliminary pump selectionwith the specifications of the delivery head,rate of flow <strong>and</strong> the viscosity conditions.When the desired flowrate <strong>and</strong> delivery head forthe fluid, as well as the viscosity <strong>and</strong> relativedensity are given at a certain pump temperature,the following equations are used to find out anapproximately equivalent power with water <strong>and</strong>to estimate the drive power of the pump for viscousfluids. Please observe that the results areless exact when you begin with the viscous conditionsinstead of with a known water performancefor determining the required water performance,except when this is involves repetitions.Step 1Calculate parameter B with the specified metricunits Q vis in m 3 /h, H vis in m <strong>and</strong> V vis in cSt withthe help of equation:B = 280 ·(V vis ) 0.50(Q vis ) 0.25 · (H vis ) 0.125If 1.0
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