water example solution instructor水示例解决方案.pdf

a

XistWorkshop

Water-WaterExampleSolution

Instructor’sNotes

Objective

•Practicerunningacaseinsimulationmode,andinterprettheresults

CaseDescriptionandBackground

Thiscase(WaterWaterExample.htri)containsresultsforatypicalcomponentcoolingwaterservicefora

nuclearpowerplant.Thedesignmeetstheprocessspecificationswithservicewateronthetubeside

withtwopasses.Componentcoolingwaterisontheshellsideasthehotfluid.

Thefunctionofthisheateristoremovedecayheatofthereactorfollowingshutdown.The

dominantthermalresistanceisfoulingwhichistypicalforthisservice.Akeyrequirementforthisservice

isthatthecomponentcoolingwatertemperaturebereducedbelowacertainvalue24hoursafter

shutdown.Itipectedthattheerwillremovemorethanthedesigndutywhentheunitisnot

fouledtoitslimit.

Solution(Instructor)

•LoadWaterWaterExample.htri

oNotethepercentagethermalresistanceduetofouling(60%)

•Torunasimulationmodeundercleanconditions:

oRemovetheduty

oRemovethefoulingfactors

oSelectsimulationmode

•Runthecase

oXistwillcalculatetheumdutywhichcanberemovedunderthespecifiedinlet

temperatureconditions

•Warningmessages

oAninternaltemperaturecross

•PLOT:bulktemperaturesasafunctionoflength

oShowsthecross

•ResultsareshowninWaterWaterExample_1.htri

oDuty:5.02MW

•Thedesiredresultisadesignwhichavoidsthetemperaturecross.

•Oneposs