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_32_85.QXP 25.05.2007 10:11 Uhr Seite 68Examples for the pump selectionin the cold water circuitFlow rate control with straight-through valvesFlow rate control with straight-throughvalves <strong>and</strong> pump performance adjustmentThe pressure loss of the system (4.65 m) is takenas the maximum pump head from a pipeworkcalculation. Due to the main pressure loss of 3 min the individual load circuit, a pump which hasconstant pressure regulation is to be selected.65 kW6 °CM12 °CMMM37 kW125 kWDelivery head H [m]14131211 10 m10max9 8 m87 6 m65 4 m43210 52 m10min15 20 25 30 35 40 45Flow Q [m³/h]The flow is determined as follows:Formula for volume flow V˙PUQ· NV·PU =m 3 /h1.16 · ∆ϑPower consumption P1 [kW]0,90,8max0,710 m0,68 m0,56 m0,40,34 m0,22 mmin0,10 5 10 15 20 25 30 35 40 45Flow Q [m³/h]Abbreviation Description1.16 Spec. heat capacity [Wh/kgK]∆Dimensioned temperature difference[K]10-20 K for st<strong>and</strong>ard systemsQ NCalculationV·PU =2271.16 · 6V·PU = 32.61 m 3 /hHeat dem<strong>and</strong> [kW]m 3 /hOperating data specificationsFlow 32.61 m 3 /hDelivery head4.65 mPumped fluidWaterFluid temperature 6 °CDensity 0.9999 kg/dm 3Kinematic viscosity 1.474 mm 2 /sVapor pressure0.1 barHydraulic data (duty point)Flow 32.6 m 3 /hDelivery head4.65 mPower consumption P1 0.699 kW68 Subject to change without prior notice 02/2007 WILO AG
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