Refrigeration, air-conditioning and cooling technology - 2007.pdf

PLH_KKK_32_85.QXP 25.05.2007 10:11 Uhr Seite 77EXAMPLES FOR THE PUMP SELECTION IN THE VAPORISER CIRCUITStep 4Wilo-Stratos 80/1-12 in ice storage modeat 100 kWStep 5C η = 3.49 -(0.0547 · 3.490.69) = 0.85Delivery head H [m]Power consumption P1 [kW]141312 12 m max111098710 m8 m6546 m4 m3min2 2 m10 5 10 15 20 25 30 35 40 45 50 55 60 65 701,81,61,41,210,80,60,40,212 m10 m8 m6 m4 m2 mminFlow Q [m³/h]maxη vis = 0.85 · 0.66 = 0.56Step 633.48 · 9.22 · 1.053P vis = = 1.58 kW367 · 0.56The selected Wilo-Stratos 80/1-12 is dimensionedat its capacity limit. It isn't possible to reducethe operating temperature to under -4°C. Operationat -3°C at otherwise the same original datais better.Cavitation can be ruled out since this is a closedcircuit. For protection, the vaporiser circuit shouldhave its own safety valve and be equipped withits own diaphragm extension vessel for a volumeexpansion of 5 to 7 %.0 510 15 20 25 30 35 40 45 50 55 60 65 70Flow Q [m³/h]Operating data specificationsFlow 33.48 m 3 /hDelivery head9.22 mPumped fluidWaterFluid temperature 20 °CDensity 0.9982 kg/dm 3Kinematic viscosity 1.001 mm 2 /sVapor pressure0.1 barHydraulic data (duty point)Flow 33.5 m 3 /hDelivery head9.22 mPower consumption P1 1.34 kWVapor pressure0.1 barMotor DataNominal power P2 1.3 kWPower consumption P1 1.57 kWRated motor speed 3300 rpmNominal voltage11.34 kW ~ 230 V, 50 HzMax. current consumption 6.8 AProtection class IP 44Permitted voltage tolerance +/- 10Wilo Planning Guide - Refrigeration, air-conditioning and cooling technology 02/2007 77