ASHRAE Handbook98.R32 INSULATION SYSTEMS FOR REFRIGERANT PIPING

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1、CHAPTER32INSULATIONSYSTEMSFORREFRIGERANTPIPINGInsulationPropertiesatBelow-AmbientTemperatures...............................................................32.1TheInsulationSystem............................................................................

2、......................................32.2InstallationGuidelines.................................................................................................................32.9MaintenanceofInsulationSystems............................................

3、................................................32.10THISCHAPTERisaguidetospecifyinginsulationsystemsforWaterabsorptionistheabilityofamaterialtoabsorbandholdrefrigerationpiping,fittings,andvessels.Itdoesnotdealwithliquidwater.Waterabsorptionisimportantwhe

4、resystemsareHVACsystemsorapplicationssuchaschilledwatersystems.Referexposedtowater.ThiswatermaycomefromexternalsourcessuchtoChapters23,24,and25intheASHRAEHandbook—Fundamen-asrain,surfacecondensationorwashdownwater.Thepropertyoftalsforinformationaboutinsul

5、ationandvaporbarriersforthesewaterabsorptionisespeciallyimportantforoutdoorsystems.systems.WatervaporpermeabilityisameasureofthepropertyofaThesuccessofaninsulationsystemforcoldpipingiscontingentmaterialthatallowswatervaportopassthroughit.Thelowertheonsuch

6、factorsasthefollowing:permeability,thehigheristheresistanceofthematerialtowatervaporintrusion.Watervaporpermeabilitycanbecriticalindesign•Correctrefrigerationsystemdesignbecausewatervaporcanpenetratematerialsthatareunaffectedby•Correctspecificationofinsul

7、atingsystemwaterintheliquidform.Watervaporintrusionisaparticularcon-•Correctspecificationofinsulationthicknesscernforinsulationsubjectedtoathermalgradient.Pressurediffer-•Correctinstallationoftheinsulationandrelatedmaterialssuchasencesbetweenambientcondit

8、ionsandthecolderoperatingvaporretardersconditionsofthepipingdrivewatervaporintotheinsulation.There•Qualityoftheinstallationitmayberetainedaswatervapor,condensetoliquidwater,orcon-•Adequatemaintenanceoftheinsulatings