AnInsideLookatANSI/ASHRAE/IESNA

Standard90.1-2019

MickSchwedler,PE

Manager

TraneApplicationsEngineering

Chair,SSPC90.1EnergyStandardforBuildingsExcept

Low-RiseResidentialBuildingsAnInsideLookatANSI/ASHRAE/AnInsideLookatANSI/ASHRAE/Helpyougaina

workingknowledgeof

ASHRAEStandard90.1Helpyougaina

workingknowleHelpyougaina

workingknowleASHRAEStandard90.1-2019

TopicsforToday’sDiscussionBriefhistoryImplementationCodesU.S.militaryrequirementsLEED?greenbuildingratingprogramContentsTitle,purpose,scopeAspectsofbuildingaddressedbyprovisionsASHRAEStandard90.1-2019

TopiASHRAEStandard90.1-2019

TopiASHRAEStandard90.1-2019Briefhistory?Milestones?Planforreprints?Scopeof2019revisionASHRAEStandard90.1-2019BriefASHRAEStandard90.1-2019BriefHistoricalTimeline90.1-2019

minor

revisions90.1-2019

updates,

reorganization90.1-2019

majorrewrite90.1-1989

updated90.1-1975

firstissued90.1-1980

updated1990200020191970198090.1-2019UpdatesHistoricalTimeline90.1-2019

mHistoricalTimeline90.1-2019

mASHRAEStandard90.1

PublicationPlanLastpublishedinlate2019Futurereprintsat3-yearintervalsCoordinatedwithmodelbuildingcodesPreviousversionplusallpublishedaddendasincelastreprint90.1-2019plannedforBODapproval

inJune2019ASHRAEStandard90.1

PublicatiASHRAEStandard90.1

PublicatiASHRAEStandard90.1

2019Changesfrom2019Incorporates42addendapublishedsince90.1-2019wasreleasedASHRAEStandard90.1

2019ChanASHRAEStandard90.1

2019ChanASHRAEStandard90.1

Scopeof2019Updatenewin

2019

90.1Marksanoteworthychangefrom90.1-2019applicationTIPMarksanapplicationtip,

notastandardrequirementASHRAEStandard90.1

ScopeofASHRAEStandard90.1

ScopeofASHRAEStandard90.1-2019Implementation?Modelcodes?U.S.government?OutsideU.S.?LEED?programASHRAEStandard90.1-2019ImpleASHRAEStandard90.1-2019ImpleASHRAEStandard90.1and

ModelCodesASHRAEStandard90.1isadoptedby:AmericanNationalStandardsInstitute

(90.1-2019)NationalFireProtectionAssociationInternationalCodeCouncil

(InternationalEnergyConservationCode)ASHRAEStandard90.1and

ModelASHRAEStandard90.1and

ModelASHRAEStandard90.1and

EnergyCodesIECC–Chapter8adopts90.1-2019byreferenceIECC–Chapter7describesanalternatepathforcomplianceIncludesmanyprovisionsof90.1-2019ASHRAEisproposingcodechangestoincreasestringencyInternationalEnergyConservationCode

(IECC)ASHRAEStandard90.1and

EnergASHRAEStandard90.1and

EnergASHRAEStandard90.1and

StateEnergyCodesAskedDOEforextensionMeetorexceed90.1-2019,2019,or201990.1beingconsidered(state

bldgs)(state

bldgs)(voluntary)(state

bldgs)(July1,2019)(state

bldgs)(optional)ASHRAEStandard90.1and

StateASHRAEStandard90.1and

StateASHRAEStandard90.1adoptionby

U.S.DepartmentofDefense“2-1MANDATORYENERGYANDWATERCONSERVATIONCRITERIA.Familyhousing(residential)shallbedesignedandconstructedinaccordancewiththelatestEnergyStarstandards,perotherappropriateservice-specificcriteriaandguidance.OtherfacilitiesshallbedesignedandconstructedinaccordancewiththelatesteditionofASHRAEStandard90.1.”—ExcerptfromUnifiedFacilitiesCriteria/techinfo/ufc/

081602_UFC3-400-01.pdfASHRAEStandard90.1adoptionASHRAEStandard90.1adoptionASHRAEStandard90.1adoption

OutsidetheU.S.UnitedStates

ASHRAEStandard

90.1-2019Thailand

Majorchanges

basedonbuilding

envelopestudiesCanada

Similarorhigher

efficiencylevelsBrazil

Law10295(2019),

EnergyEfficiency

StandardsChina

Modifyingfor

highlocalambient

wetbulbsASHRAEStandard90.1adoption

ASHRAEStandard90.1adoption

ASHRAEStandard90.1and

LEED?-NCVersion2.2EAp2:MinimumenergyperformanceMandatoryprovisionsof90.1-2019andPrescriptiverequirementsor14%betterthan90.1-2019EAc1:OptimizeenergyperformanceAwardspointsforimprovingperformanceratingofthedesignbuildingvs.baselinebuildingatleast14%betterthan90.1-2019ASHRAEStandard90.1and

LEED?ASHRAEStandard90.1and

LEED?LEEDNC2009:EAp2

MinimumenergyperformanceOption1:performancecompliancepathMandatoryprovision(5.4,6.4,7.4,8.4,9.4,and10.4)BaselinebuildingcomplieswithAppendixGBuildingPRM10%betterthan90.1-2019fornewconstruction,5%betterforexistingbuildingOption2:prescriptivecompliancepathASHRAEAEDGsmallofficebuildings2019smallretailbuildings2019smallwarehousesandself-storagebuildings2019Option3:prescriptivecompliancepathAdvancedBuildingsCorePerformanceGuide

LEEDNC2009:EAp2

MinimumenLEEDNC2009:EAp2

MinimumenEAC1–Modeling

Upto19pointsNewBuildingsExistingBuildingRenovationsPoints12%8%114%10%216%12%318%14%420%16%522%18%624%20%726%22%828%24%930%26%1032%28%1134%30%1236%32%1338%34%1440%36%1542%38%1644%40%1746%42%1848%44%19EAC1–Modeling

Upto19pointEAC1–Modeling

Upto19pointASHRAEStandard90.1-2019Contents?Purpose?Scope?AspectsofbuildingaddressedbyprovisionsASHRAEStandard90.1-2019ConteASHRAEStandard90.1-2019ConteASHRAEStandard90.1-2019

Purpose“…Provideminimumrequirementsfortheenergy-efficientdesignofbuildingsexceptlow-riseresidentialbuildings”ASHRAEStandard90.1-2019

PurpASHRAEStandard90.1-2019

PurpASHRAEStandard90.1-2019

ScopeNewbuildingsandtheirsystemsNewportionsofbuildings

andtheirsystemsNewsystemsandequipmentinexistingbuildingsASHRAEStandard90.1-2019

ScopASHRAEStandard90.1-2019

ScopASHRAEStandard90.1-2019

ExclusionsLow-riseresidentialbuildingsASHRAEStandard90.2coverslow-rise

(3storiesorless),one-family,andtwo-familyresidentialbuildingsBuildingsthatdonotuseelectricityorfossilfuelEquipmentandportionsofbuildingsystemsthatuseenergytosupportindustrial,manufacturing,orcommercialprocessesASHRAEStandard90.1-2019

ExclASHRAEStandard90.1-2019

ExclASHRAEStandard90.1

SectionsSection1:PurposeSection2:ScopeSection3:Definitions,Abbreviations,andAcronymsSection4:AdministrationandEnforcementSection5:BuildingEnvelopeSection6:HVACSection7:ServiceWaterHeatingSection8:PowerSection9:LightingSection10:ElectricMotorsSection11:EnergyCostBudget(ECB)MethodSection12:NormativeReferencesAppendicesASHRAEStandard90.1

SectionsSASHRAEStandard90.1

SectionsSASHRAEStandard90.1Section5:

BuildingEnvelopeASHRAEStandard90.1Section5:ASHRAEStandard90.1Section5:section5:buildingenvelope

BasisofRequirementsClimatezoneSpaceconditioningcategoryNonresidentialconditionedResidentialconditionedSemiheatedConstructionclass?2019

AmericanStandardAllrightsreservedsection5:buildingenvelope

Bsection5:buildingenvelope

BLookupclimate

zonesbylocation…Miami,SanJuan=1ASeattle =4CReykjavik =7A

moistC

marineB

dryGroupsclimatesinto8zonesSubcategorizeszones

byhumiditylevelappendixB:buildingenvelope

ClimateCriteria1

very

hot8

subartic7

very

cold6

cold5

cool4

mixed3

warm2

hotLookupclimate

zonesbylocatLookupclimate

zonesbylocatU.S.ClimateClassifications

(Briggsetal.,2019)U.S.ClimateClassifications

(U.S.ClimateClassifications

(ASHRAEStandard90.1

MoreInternationalDataForSouthAmerica…Ascuncion Montivideo

Belem PortoAlegre

Brasilia PuntaArenas

BuenosAries Recife/Curado

Caracas RiodeJaneiro

Concepcion SanJuan

Cordoba deMarcona

Fortaleza Santiago

LaPaz SaoPaulo

Lima TalaraASHRAEStandard90.1

MoreInteASHRAEStandard90.1

MoreInteASHRAEStandard90.1

MoreInternationalDataForPuertoRico…AllZone1AExcept,Barranquitas2SSW -2BCayey1E -2BASHRAEStandard90.1

MoreInteASHRAEStandard90.1

MoreInteASHRAEStandard90.1

CompliancePaths:Envelopeproposed

buildingdesign90.1-compliant

buildinggeneral&

mandatory

provisionsPrescriptive

BuildingEnvelope

Option(§5.5)BuildingEnvelope

Trade-OffOption

(§5.6,performance)EnergyCost

BudgetMethod

(ECB,§11)ASHRAEStandard90.1

CompliancASHRAEStandard90.1

CompliancMandatoryProvisionsLabelingofinsulationR-valueRatingofdoorsandfenestrationAirleakageBuildingenvelopeFenestrationanddoorsLoadingdocksVestibules(withexceptions)MandatoryProvisionsLabelingMandatoryProvisionsLabelingsection5:buildingenvelope

TypicalAssembliesOnesummaryofrequirementsforeachclimatezonePrecalculatedheattransfervaluessimplifyapplication?2019

AmericanStandardAllrightsreservedsection5:buildingenvelope

Tsection5:buildingenvelope

Tsection5:buildingenvelope

DemonstratingComplianceOpaqueelementsMaximumU-factorforentireassembly,orMinimumratedR-valuesofinsulationFenestration…MaximumU-factorMaximumsolarheat

gaincoefficient(SHGC) …basedonorientation

andpercentagesection5:buildingenvelope

Dsection5:buildingenvelope

Dprescriptivecompliance

EnvelopeFenestrationSkylightareaaspercentage

ofgrossroofareaVerticalfenestrationglazing

areaaspercentageofgrosswallareaU-factordependsonconstructiontypeSolarheatgaincoefficient(SHGC)dependsonorientationprescriptivecompliance

Enveloprescriptivecompliance

Enveloprescriptivecompliance

OpaqueEnvelopeElementsNocalculationsrequired…Either:SpecifyinsulationR-valueorLookupcommonU-factorsprescriptivecompliance

Opaqueprescriptivecompliance

OpaqueoverallU-factors

RoofConstructionClassesInsulationentirely

abovedeckMetalbuildingroofsAtticandotherroofsoverallU-factors

RoofConstruoverallU-factors

RoofConstruoverallU-factors

Above-GradeWallsMasswallsMetalbuildingwallsMetal-framedwallsWood-framedandotherwallsoverallU-factors

Above-GradeoverallU-factors

Above-GradeEnvelopeAddendaas:Modifiesopaqueenveloperequirementsat:Modifiesfenestration(glass)requirements90.1

2019

ChangeEnvelopeAddendaas:ModifiesoEnvelopeAddendaas:Modifiesoexample*ExcerptfromTable5.5-2,BuildingEnvelopeRequirementsforClimateZone2(A,B),ofASHRAEStandard90.1-2019Exampleof§5.5’scompliancecriteriaforroofs,basedonclimatezoneandconstructiontypeBuildingEnvelopeRequirements*?2019

AmericanStandardAllrightsreservedexample*ExcerptfromTable5.5example*ExcerptfromTable5.5example*ExcerptfromTable5.5-5,BuildingEnvelopeRequirementsforClimateZone5ofASHRAEStandard90.1-2019Exampleof§5.5’scompliancecriteriaforroofs,basedonclimatezoneandconstructiontypeBuildingEnvelopeRequirements*?2019

AmericanStandardAllrightsreservedexample*ExcerptfromTable5.5example*ExcerptfromTable5.5example*ExcerptfromTable5.5-1,BuildingEnvelopeRequirementsforClimateZone1(A,B),ofASHRAEStandard90.1-2019Exampleof§5.5’scompliancecriteriaforroofs,basedonclimatezoneandconstructiontypeBuildingEnvelopeRequirements*?2019

AmericanStandardAllrightsreservedexample*ExcerptfromTable5.5example*ExcerptfromTable5.5section5:buildingenvelope

DemonstratingComplianceInlieuofprescriptiveoptions….BuildingEnvelopeTrade-OffOption,orEnergyCostBudgetmethodStillinconjunctionwithmandatoryrequirementsBuildingEnvelopeTrade-OffOption—

EnvStd5.0software

automatesEnvelope

PerformanceFactor

calculationssection5:buildingenvelope

Dsection5:buildingenvelope

Dsection5:buildingenvelope

SummaryCriteriabasedonspacetypeOnetablesummarizesenvelope

requirementsperclimatezonePrecalculatedU-factorsfor

commonconstructiontypesComputerized“building

envelopetrade-off”procedure?2019

AmericanStandardAllrightsreservedsection5:buildingenvelope

Ssection5:buildingenvelope

SASHRAEStandard90.1Section6:

HVACSection7:

ServiceWaterHeatingASHRAEStandard90.1Section6:ASHRAEStandard90.1Section6:Simplified

Approach

Option(§6.3)ASHRAEStandard90.1

CompliancePaths:HVACproposed

HVACdesign90.1-compliant

HVACsystemprescriptive

requirements

(§6.5)Simplified

Approach

Option(§6.3)EnergyCost

BudgetMethod

(ECB,§11)(smallbuildingsonly)mandatory

provisions

(§6.4)Simplified

Approach

Option(§Simplified

Approach

Option(§HVACcompliancewithStd90.1

SimplifiedApproachMinimaleffortEquallystringentrequirementsFitsontwopagesLimitedto…Buildingswith1or2storiesBuildingslessthan25,000squarefeetSingle-zonesystemsAir-cooledorevaporativelycooledHVACcompliancewithStd90.1

HVACcompliancewithStd90.1

HVACcompliancewithStd90.1SimplifiedApproachEconomizerasnecessaryHeat:Heatpump,fuel-firedfurnace,electricresistance,orbaseboardsystemwithboilerOutdoorair:≤3,000cfm,<70%ofSA,unlessenergyrecoveryisusedManual-changeoverordual-setpointthermostatControlsforheatpumpswithauxiliaryheatNoreheatforhumiditycontrolcontinuedHVACcompliancewithStd90.1HVACcompliancewithStd90.1HVACcompliancewithStd90.1

SimplifiedApproachNightsetbackcontrols

(excepthotel/motelguestrooms)InsulationforpipingandductworkBalancingofductedsystemsInterlockedthermostatsforseparateheatingandcoolingequipmentExhaust>300cfm:GravityormotorizeddampersSystem>10,000cfm:OptimumstartconcludedHVACcompliancewithStd90.1

HVACcompliancewithStd90.1

section6:HVAC

MandatoryProvisionsSimplified

Approach

Option(§6.3)proposed

HVACdesign90.1-compliant

HVACsystemprescriptive

requirements

(§6.5)Simplified

Approach

Option(§6.3)EnergyCost

BudgetMethod

(ECB,§11)(smallbuildingsonly)mandatory

provisions

(§6.4)section6:HVAC

MandatoryProvsection6:HVAC

MandatoryProvsection6:HVAC

MandatoryProvisionsEquipmentefficienciesLoadcalculationsControlsConstructionandinsulationCompletionrequirements Drawings,manuals,balancing,and

commissioningsection6:HVAC

MandatoryProvsection6:HVAC

MandatoryProvAirconditionersand

condensingunitsHeatpumpsChillersPTACsFurnacesBoilersHeat-rejectionequipmentmandatoryHVACprovisions

EquipmentEfficienciesAirconditionersand

condensinAirconditionersand

condensinsection6:HVAC

EquipmentEfficienciesraisedan:Boilerefficiencies

18trillionBtuofgasoroilannuallyasstockturnsF:Three-phaseair-cooledACandheatpumps

2.3quadsby2035g:Air-cooledACandheatpumps

1.05quadsby203590.1

2019

Changesection6:HVAC

EquipmentEffisection6:HVAC

EquipmentEffiexamplesof

EquipmentEfficiencies§:“…Wheremultipleratingconditions

orperformancerequirementsareprovided,theequipmentshallsatisfyallstatedrequirements…”Equipmenttype

MinimumefficiencySelf-contained,water-cooled 11.0EER

w/electricresistanceheat 10.3IPLV

(20–100tons)Water-sourceheatpump 12.0EER(cooling)

(1.5–5.25tons) 4.2COP(heating)Centrifugalchiller, 6.10COP 0.576kW/ton

water-cooled(300tons) 6.40IPLV 0.549IPLV

(atARIratingconditions)examplesof

EquipmentEfficienexamplesof

EquipmentEfficienmandatoryHVACprovisions

LoadCalculationsMustcalculateheatingandcoolingsystemdesignloadsMustbasecalculationsongenerallyacceptedengineeringstandardsandhandbooks?2019

AmericanStandardAllrightsreservedmandatoryHVACprovisions

LoadmandatoryHVACprovisions

LoadmandatoryHVACprovisions

ZoneThermostaticControlsRequiredforeachzone

Perimetercanbetreateddifferently≥5oFdeadband

Dualsetpointordeadband

(canbesoftwareforDDC)mandatoryHVACprovisions

ZonemandatoryHVACprovisions

Zonezonethermostaticcontrols

PerimeterZones60ftbuildingplanview:thermalzoningexample<50ftCoreandeach

longexposure

mustbezoned

separatelyZ1Z5Z2Z3Z4Treatingthese

exposuresasa

singlezoneis

okayzonethermostaticcontrols

Perzonethermostaticcontrols

PerOff-hourControlsExceptionwasdeletedforHVACsystemsservinghotel/motelguestrooms90.1

2019

ChangeOff-hourControlsExceptionwasOff-hourControlsExceptionwasmandatoryforsystems≥

15,000Btu/h

AutomaticShutdownAutomatic7-day/weektimeclock

with10-hourbatterybackupException:2-day/weekthermostatforresidentialapplicationsOccupancysensorManuallyoperatedtimer

(maximumduration:2hours)Securitysysteminterlockmandatoryforsystems≥

15,00mandatoryforsystems≥

15,00mandatoryforsystems

≥15,000Btu/h

SetbackControlsClimatezones2-8:

Lowerheatingsetpointto55°ForlessClimatezones1b,2b,3b(hot/dry):

Automaticallyrestart,temporarilyoperateRaisecoolingsetpointto90°Forhigher OrPreventhighspacehumiditylevelsmandatoryforsystems

≥15,00mandatoryforsystems

≥15,00mandatoryHVACprovisions

OtherOff-HourControlsProvideoptimumstartifsystemsupply-aircapacity>10,000cfmZoneisolation:25,000ft2maximumzonesizeononefloorIsolationdevicestoshutoffoutdoorandexhaustairflowCentralsystemscapableofstableoperationmandatoryHVACprovisions

OthemandatoryHVACprovisions

OtheZoneIsolation

ExamplecentralVAVfansystemroof“normally-closed”

VAVboxesVAVboxeswith

DDCcontrolsreturnair(typical)motorizeddampercombinationfire/smokedampersupplyducttozones(typical)?2019

AmericanStandardAllrightsreservedZoneIsolation

ExamplecentralZoneIsolation

ExamplecentralASHRAE62.1ReferenceChangedfrom62.1-2019to62.1-2019VentilationrateschangedNowbasedonsummationofratesperpersonandperarea90.1

2019

ChangeASHRAE62.1ReferenceChangedfASHRAE62.1ReferenceChangedfmandatoryHVACprovisions

VentilationSystemControlsProvidemotorizeddampers:InstairandelevatorshaftsOngravityhoods,vents,andventilators Exceptions:Buildings<3storieshigh Or,anybuildinginclimatezones1,2,3

(hotclimates)VentilationsystemsservingunconditionedspacesmandatoryHVACprovisions

VentmandatoryHVACprovisions

VentmandatoryHVACprovisions

VentilationSystemControlsProvideshutoff-dampercontrolfor

outdoor-airsupplyandexhaustsystemsAutomaticallyshutwhensystemsorspacesarenotinuseAutomaticallyshutduringbuildingwarm-up,cool-down,andsetbackExceptions:Buildings<3storieshigh,oranybuildinginclimatezones1,2,3Outdoor-airintakeorexhaust<300cfmmandatoryHVACprovisions

VentmandatoryHVACprovisions

VentmandatoryHVACprovisions

DamperLeakageRate* Dampers<24inchesineitherdimension

mayhaveleakageof40cfm/ft2Maximumleakageat1.0in.wg,

cfm/ft2ofdamperareaClimatezone Motorized Non-motorized1,2,6,7,8 4cfm/ft2 NotallowedAllothers 10cfm/ft2 20cfm/ft2*mandatoryHVACprovisions

DampmandatoryHVACprovisions

DampmandatoryHVACprovisions

Ventilation:HighOccupancyDemandControlVentilation(DCV)requiredforSpaces>500ft2anddesignoccupancy

>40people/1000ft2:90.1

2019

Change(was3000cfmand

100people/1000ft2)mandatoryHVACprovisions

VentmandatoryHVACprovisions

VentmandatoryHVACprovisions

HeatPumps:AuxiliaryHeatForheatpumpswithinternalelectricheaters,controlsmustlockoutelectricheatwhenloadcanbemetbyheatpumpaloneException:

HeatpumpsregulatedbyNAECAifHSPFratingmeetsTable6.8.1BandincludeselectricresistanceheatingmandatoryHVACprovisions

HeatmandatoryHVACprovisions

HeatmandatoryHVACprovisions

HumidificationControlsHumidifierpreheat

ShutoffhumidifierpreheatwhenhumidificationisnotrequiredHumidificationanddehumidification

Preventsimultaneousoperation Exception:

Spacesthatrequirespecifichumiditylevels(computerrooms,museums,hospitals)ifapprovedbyauthorityhavingjurisdictionmandatoryHVACprovisions

HumimandatoryHVACprovisions

HumimandatoryHVACprovisions

Ventilation:HighOccupancyIfoutdoorair>3,000cfmand

designoccupancy>100people/1000ft2:AutomaticallyreduceoutdoorairintakebelowdesignrequirementswhenspacesarepartiallyoccupiedExceptions:Systemswithexhaust-airenergyrecoverycomplyingwithSectionSystemswith<1,200cfmoutdoorairmandatoryHVACprovisions

VentmandatoryHVACprovisions

Vent?2019

AmericanStandardAllrightsreservedComplyingwiththemandatoryHVACprovisionsinASHRAEStandard90.1-2019requiresunit-andsystem-levelcontrols?2019AmericanStandardAll?2019AmericanStandardAllmandatoryHVACprovisions

Construction&InsulationInsulationmustbesuitedtoenvironmentDuct,plenuminsulationClimatezoneLocationPipinginsulationHeating,domestichotwater,orcoolingTemperaturePipesizemandatoryHVACprovisions

ConsmandatoryHVACprovisions

ConsDuct

Insulation

Example?2019

AmericanStandardAllrightsreservedFigure6-Gfrom

90.1User’sManualDuct

Insulation

Example?2019Duct

Insulation

Example?2019ConstructionandInsulationMustleak-testductwork

ifdesignstaticpressure

>3in.wgConstructionandInsulationMusConstructionandInsulationMusmandatoryHVACprovisions

CompletionRequirementsDocumentationwithin90daysofsystemacceptance:DrawingsofactualinstallationSubmittaldataOperationandmaintenancemanualsServiceagencyinformationControlsequencesandschematicsmandatoryHVACprovisions

CompmandatoryHVACprovisions

CompmandatoryHVACprovisions

CompletionRequirementsSystembalancingWrittenreportconditionedspaces>5000ft2Forairsidesystemfanpower>1hpandhydronicpumps>10hp:

1. Minimizethrottlinglosses

2. TrimimpelleroradjustdesignspeedcontinuedmandatoryHVACprovisions

CompmandatoryHVACprovisions

CompmandatoryHVACprovisions

CompletionRequirementsCommissioning(AppendixE)Controlelementscalibrated,adjusted,and

inworkingorderDesignermustprovidedetailedinstructions(perAppendixE)forprojects>50,000ft2 Exceptions:

Warehouses,semi-heatedspacesconcludedmandatoryHVACprovisions

CompmandatoryHVACprovisions

Compsection6:HVAC

MandatoryProvisionsRecapMustbemetwhetherusingprescriptiveorperformance(ECBmethod)pathMandatesinclude:EquipmentefficiencyControlsConstructionandinsulationCompletionrequirements(drawings,manuals)Balancingandcommissioningsection6:HVAC

MandatoryProvsection6:HVAC

MandatoryProvsection6:HVAC

PrescriptiveRequirementsSimplified

Approach

Option(§6.3)proposed

HVACdesign90.1-compliant

HVACsystemprescriptive

requirements

(§6.5)Simplified

Approach

Option(§6.3)EnergyCost

BudgetMethod

(ECB,§11)(smallbuildingsonly)mandatory

provisions

(§6.4)section6:HVAC

PrescriptiveRsection6:HVAC

PrescriptiveRsection6:HVAC

PrescriptiveRequirementsEconomizersSimultaneousheatingandcoolingAirsystemdesign

andcontrolHydronicsystem

designandcontrolHeatrejectionequipmentEnergyrecoveryExhausthoodsRadiantheatingHotgasbypasslimitationsection6:HVAC

PrescriptiveRsection6:HVAC

PrescriptiveRprescriptiveHVACrequirements

EconomizersClimateandsystemsizedetermineneedforaneconomizerMaybeeitherairsideorwatersideNumerous(9)exceptions,includinganefficiencytradeoffControlmustbeintegratedwithmechanicalcoolingOperationmustnotincreaseheatingenergyconsumptionprescriptiveHVACrequirementsprescriptiveHVACrequirementsCoolingcapacityforwhich

aneconomizerisrequiredclimateandsystemsizedeterminants

EconomizersClimatezone1a,1b,2a,3a,4a Economizerunnecessary

(PuertoRico,Miami,St.Louis,Charlotte)2b,5a,6a,7,8 ≥135,000Btu/h

(Yuma,Chicago,Edmonton)3b,3c,4b,4c,5b,5c,6b ≥65,000Btu/h

(Denver,Lubbock,Vancouver)Coolingcapacityforwhich

anCoolingcapacityforwhich

anprescriptiveHVACrequirements

AirEconomizersProhibitedcontroltypesFixedenthalpyinclimatezones

1b,2b,3b,3c,4b,4c,5b,5c,6b,7,8Differentialdrybulbinclimatezones

1a,2a,3a,4aHigh-limitshutoffcontrolsettingsAbletorelieveexcessoutdoorairprescriptiveHVACrequirementsprescriptiveHVACrequirementsprescriptiveHVACrequirements

WaterEconomizersCapacity:100%ofsystemcoolingloadat

50°FDB/45°FWB(45°FDB/40°FWB

fordehumidification)Maximumpressuredrop<15ft

(orbypassed)whennotinuseFigure6-Ofrom

90.1User’sManualwaterside

economizerprescriptiveHVACrequirementsprescriptiveHVACrequirementsprescriptiveHVACrequirements

SimultaneousHeating–CoolingZonecontrolsNoreheatingNorecoolingNomixingorsimultaneouslysupplyingmechanically(oreconomizer)cooledandmechanicallyheatedairExceptionsbasedonzoneairflowprescriptiveHVACrequirementsprescriptiveHVACrequirementssimultaneousheating–cooling

Zone-ControlExceptionsZoneairflowdoesnotexceedwhichever

islargest:ASHRAEStandard62’szone

requirementsforoutdoorair0.4cfm/ft230%ofsupplyair300cfmASHRAEStandard62’s

multiple-spacerequirementssimultaneousheating–cooling

Zsimultaneousheating–cooling

Zsimultaneousheating–cooling

Zone-ControlExceptionsZoneswithspecialpressurizationrequirementsZoneswithcode-requiredminimumcirculationratesSite-recoveredorsite-solarenergyprovides≥75%ofreheatenergyconcludedsimultaneousheating–cooling

Zsimultaneousheating–cooling

ZprescriptiveHVACrequirements

SimultaneousHeating–CoolingHydronicsystemcontrolsThree-pipe:NotallowedTwo-pipechangeover:Controlsmustpreventchangeoverunless…Outdoordrybulbchangesby≥15°FSystemoperatesinonemodeatleast

4hoursDifferencebetweencoolingandheatingtemperaturesis≤30°FprescriptiveHVACrequirementsprescriptiveHVACrequirementsprescriptiveHVACrequirements

SimultaneousHeating–CoolingHydronic(waterloop)heatpumpsystemsDeadband≥20°F

(Exception:Optimizedloopcontrol)Climatezones3-8:Bypassforclosed-circuitfluidcoolerIsolateopentowersfromheat-pumploopprescriptiveHVACrequirementsprescriptiveHVACrequirementsprescriptiveHVACrequirements

SimultaneousHeating–CoolingDehumidificationPrevent:ReheatingMixingofhotandcoldairstreamsHeatingandcoolingthesameairstreamprescriptiveHVACrequirementsprescriptiveHVACrequirementssimultaneousheating–cooling

DehumidificationExceptionsReducingsupplyairflowto50%,orminimumventilationrateSystems<6.67tonsthatcanunload

atleast50%Systemssmallerthan3.3tonsSystemswithspecifichumidityrequirements(museums,surgicalsuites)75%ofreheat/recoolenergyissite-recoveredorsite-solarsimultaneousheating–cooling

Dsimultaneousheating–cooling

Dsidestreamchillerarrangement

WatersideHeatRecoveryproduction

(supply)distribut