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 11:02 Uhr Seite 29Pump intakePump sumpA pump sump is required when there is irregularintake <strong>and</strong> pumping off of the delivered fluid.The size of the sump depends on the pump flow<strong>and</strong> the permissible switching frequency of theelectromotor. The useful volume of the pumpsump is calculated with :Q m =V N = Q zu ·Q e + Q a2Q m - Q zuQm · ZAbbreviation DescriptionZmaximum permissible number of switches per hourQ zu Delivery in m 3 /hQ e Flow at the switching-on point in m 3 /hQ a Flow at the switching-off point in m 3 /hV N Useful volume of the pump sump in m 3Any backflow volume is to be added to this,if necessary.If contaminated fluids are used, it must beavoided that solid matter gets deposited onthe floor. This can be avoided with inclinedwalls of at least 45°, or better 60°.Suction tankd E0.5 d ESuction pipeTo avoid turbulence <strong>and</strong> the formation of shearingforces due to irregular intake, an impact surfacein the pump sump is recommendable.45 to 60°Pump sump with impact surfaceImpact surfaceWilo Planning Guide - <strong>Refrigeration</strong>, <strong>air</strong>-<strong>conditioning</strong> <strong>and</strong> <strong>cooling</strong> <strong>technology</strong> 02/2007 29
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