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 74Examples for the pump selectionin the vaporiser circuitVaporiser circuit with constant volume flowThe circuit of a load system is specified witha pressure loss of 13.1 m. The pressure for thevaporiser (5 m) is to be added. The pump mustachieve a delivery head of at least 18.1 m.Distribution connection in the vaporiser circuitin front of the loadsCapacitorsThe circulated volume is determined as follows:Formula for volume flow V˙PUV·PU =Abbreviation Description1.16 Spec. heat capacity [Wh/kgK]∆Dimensioned temperature difference[K]2-12 K for st<strong>and</strong>ard systemsQ NV·PU =VaporiserCalculationQ· N1.16 · ∆ϑ2001.16 · 6V·PU = 28.74 m 3 /hm 3 /hHeat dem<strong>and</strong> [kW]m 3 /hM M MA pump with a flow rate of Q = 28.74 m 3 /h <strong>and</strong>H = 18.1 m is to be selected.The selected pump is the Wilo-CronoLine-IL 50/260-3/4.Cavitation can be ruled out since this is a closedcircuit. For protection, the vaporiser circuit shouldhave its own safety valve <strong>and</strong> be equipped withits own diaphragm extension vessel for a volumeexpansion of 5 to 7 %.Delivery head H [m]302520151050 51Ø 25510 15 20 25 30 35 40 45Flow Q [m³/h]Operating data specificationsFlow 28.74 m 3 /hDelivery headPumped fluid18.1 mWaterFluid temperature 16 °CDensity 0.9989 kg/dm 3Kinematic viscosity 1.11 mm 2 /sVapor pressureHydraulic data (duty point)0.1 barFlow 29 m 3 /hDelivery headShaft power P2SpeedNPSHImpeller diameter18.4 m2.66 kW1450 rpm2.56 m255 mm74 Subject to change without prior notice 02/2007 WILO AG
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