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1、RelatedCommercialResourcesCHAPTER46DESIGNANDAPPLICATIONOFCONTROLSSystemTypes.............................................................................46.1WaterHeating........................................................................46.20HeatingSystem
2、s........................................................................46.1SpecialApplications...............................................................46.20CoolingSystems........................................................................46.4Desig
3、nConsiderationsandPrinciples...................................46.21AirSystems...............................................................................46.7ControlPrinciplesforEnergyConservation.........................46.22UTOMATICcontrolofHVACsystemsan
4、dequipmentusuallyinclude(1)minimumwaterflowthroughboilers,(2)protectingboil-Aincludescontroloftemperature,humidity,pressure,andflowersfromtemperatureshockandcondensationintheflue,and(3)coilratesofairandwater.Automaticcontrolscansequenceequipmentlow-temperatur
5、edetection.Ifmultipleoralternativeheatingsourcesoperationtomeetloadrequirementsandtoprovidesafeequipment(e.g.,condenserheatrecovery,solarstorage)areused,thecontroloperationusingpneumatic,mechanical,electrical,electronic,strategymustalsoincludeawaytosequenceho
6、t-watersourcesorand/ordirectdigitalcontrol(DDC)devices.selectthemosteconomicalsource.ThischapteraddressescontroloftypicalHVACsystems,designFigure1showsasystemforloadcontrolofagasoroil-firedofcontrolsforsystemcoordinationandforenergyconservation,andboiler.Boil
7、ersafetycontrolsusuallyincludeflame-failure,high-controlsystemcommissioning.Chapter15ofthe2005ASHRAEtemperature,andothercutouts.Field-installedoperatingcontrolsHandbook—Fundamentalscoversdetailsofcomponenthardwaremustallowsafetycontrolstofunctioninallmodesofo
8、peration.andthebasicsofcontrol.Intermittentburnerfiringusuallycontrolscapacity,althoughburnermodulationiscommoninlargersystems.Inmostcases,theboilerisSYSTEMTYPEScontrolledtomaintainaconst
