HTRI_2019年成都年会-板式换热器培训班资料Xphe3ppt课件

1、Module 3 Heat Transfer Research, Inc. All rights reserved. Confidential: For HTRI member use only.lObjectiveslDescribe HTRI methods to specify fluid propertieslgrid propertieslcomponent-by-component lGive practical guidelines to best specify fluid propertieslDevelop grid properties for ammonia conde

2、nser Heat Transfer Research, Inc. All rights reserved. Confidential: For HTRI member use only.lDensitylViscositylPressure droplSpecific heat lSingle-phase heat releaseltemperature profilelThermal conductivitylHeat transfer coefficientkhDe Nu Heat Transfer Research, Inc. All rights reserved. Confiden

3、tial: For HTRI member use only.lTemperature/enthalpy/weight fraction vapor datalSpecific heat for single-phaselVapor-liquid equilibrium model for two-phaselTemperature profilelMean temperature difference Heat Transfer Research, Inc. All rights reserved. Confidential: For HTRI member use only.lMixtur

4、e properties via gridlUser-specified heat release only lProperty generator button Heat Transfer Research, Inc. All rights reserved. Confidential: For HTRI member use only.lT&PlReference pressures (1 minimum, 12 maximum)lReference temperatures for each pressure (3 minimum, 30 maximum) Heat Transfer R

5、esearch, Inc. All rights reserved. Confidential: For HTRI member use only.lHeat ReleaselEnthalpy for each reference pressure and temperaturelWeight fraction vapor for two phase Heat Transfer Research, Inc. All rights reserved. Confidential: For HTRI member use only.lProperty GridlRequired properties

6、 are identifiedDo not leave blanks even if case runs Heat Transfer Research, Inc. All rights reserved. Confidential: For HTRI member use only.lProperty Monitor shows grid established for caselThis example shows 2 pressures and 10 temperatures Heat Transfer Research, Inc. All rights reserved. Confide

7、ntial: For HTRI member use only.Xphe interpolates temperature and pressure to get properties at any required temperature and pressure Heat Transfer Research, Inc. All rights reserved. Confidential: For HTRI member use only.lInterpolation MethodslQuadratic fit between reference temperatureslLinear fi

8、t between reference pressures Heat Transfer Research, Inc. All rights reserved. Confidential: For HTRI member use only.lVMGThermolXchanger Suite 4.0lPPDSlDiscount available at MarketinghtrilREFPROP/srd/nist23.htmlHYSYSlAspenTechlPRO/IIlSimulation Sciences Heat Transfer Research, Inc. All ri

9、ghts reserved. Confidential: For HTRI member use only.lComponent by componentlThree heat release optionsSuitable when data are insufficient foraccurate grid Heat Transfer Research, Inc. All rights reserved. Confidential: For HTRI member use only.lUser-specifiedlThree or more enthalpies for each refe

10、rence pressurelSame as grid heat release method Heat Transfer Research, Inc. All rights reserved. Confidential: For HTRI member use only.lSpecified dew/bubble pointlDew point at outlet pressurelBubble point at inlet pressureTwo-point heat release option Heat Transfer Research, Inc. All rights reserv

11、ed. Confidential: For HTRI member use only.lProgram-calculatedlGrid generated at 12 pressures and 30 temperatureslPure componentslHTRI databanklDIPPRlIdeal mixtureslUser-defined components Heat Transfer Research, Inc. All rights reserved. Confidential: For HTRI member use only.lLiquid and/or vapor p

12、ropertieslTwo temperaturesllinear grid created for r, k, cp llogarithmic grid created for mlOne temperaturelconstant properties Heat Transfer Research, Inc. All rights reserved. Confidential: For HTRI member use only.lConstants subpanellAverage latent heat required for user-defined two-phase fluidsl

13、Liquid critical pressure required for user-defined boiling fluidlWith hydrocarbon option, vapor/liquid properties not required Heat Transfer Research, Inc. All rights reserved. Confidential: For HTRI member use only.lVLE subpanellActivity coefficients(K-value data) required for mixtureslUser-specifi

14、ed vapor pressure datalAntoine constants calculated by Xchanger Suite Heat Transfer Research, Inc. All rights reserved. Confidential: For HTRI member use only.lComponent and grid propertieslUser-specified heat release onlylGrid properties used where specified Heat Transfer Research, Inc. All rights

15、reserved. Confidential: For HTRI member use only.GridAvailable?GridAdequate?yesMixture properties via gridyesSingle-PhaseTwo-PhasenonoHTRIDatabank OK?Heat releasedata provided?nonoyesyesComponent by component User-specified heat releaseComponent by component Program-calculated heat releaseUser defin

16、ed componentComponent by component Program-calculated heat releaseHTRI databank component(s) Heat Transfer Research, Inc. All rights reserved. Confidential: For HTRI member use only.lData provided by process grouplData calculated by Property GeneratorlComposition knownlMixture model identifiedlFlash

17、 type (integral versus differential)Grid includes all required heat release and fluid property data Heat Transfer Research, Inc. All rights reserved. Confidential: For HTRI member use only.lDo pressure and temperature ranges cover operating conditions?lSubcooled and superheated regimeslPiping and co

18、lumn conditions for thermosiphonslMore than two reference pressures for low pressure thermosiphons Heat Transfer Research, Inc. All rights reserved. Confidential: For HTRI member use only.lAre data identified for all temperature and pressure points?lAre variations in data smooth?lHeat release data m

19、ust be monotonic with temperature Grid is adequate if answers to these questions are yes Heat Transfer Research, Inc. All rights reserved. Confidential: For HTRI member use only.lPure substanceslWithin temperature and pressure range lDIPPR can be usedlVLE subpanel can be used for more accurate MTDlI

20、deal mixtureslSingle-phase gas-gas mixtureslOne condensing/boiling component with inerts Heat Transfer Research, Inc. All rights reserved. Confidential: For HTRI member use only.Displays fluid physical properties for each fluid at inlet and outlet conditions Heat Transfer Research, Inc. All rights r

21、eserved. Confidential: For HTRI member use only.lOpen Example3.htrilCondensing NH3lCooling waterlSpecified input temperature modifiedlInlet pressure respected Heat Transfer Research, Inc. All rights reserved. Confidential: For HTRI member use only.lProperty MonitorlHTRI databankl12 pressures, 10 tem

22、peratures Heat Transfer Research, Inc. All rights reserved. Confidential: For HTRI member use only.lCreate grid of properties using VMGThermolRun caselWhich results are more accurate? Heat Transfer Research, Inc. All rights reserved. Confidential: For HTRI member use only.lReopen Example3.htrilRemove hot fluid temperatureslSpecif hot inlet pressure of 190 psia lRun caselCompare results with VMG Heat Transfer Research, Inc. All righ