澳大利亚热泵市场-英_第1页
澳大利亚热泵市场-英_第2页
澳大利亚热泵市场-英_第3页
澳大利亚热泵市场-英_第4页
澳大利亚热泵市场-英_第5页
已阅读5页,还剩53页未读 继续免费阅读

下载本文档

版权说明:本文档由用户提供并上传,收益归属内容提供方,若内容存在侵权,请进行举报或认领

文档简介

Heat

pumps

Emergingtrends

in

the

AustralianmarketSEPTEMBER

2023Heatpumps

–EmergingtrendsintheAustralian

marketThispublicationhasbeenfunded

bythe

DepartmentofClimateChange,Energy,the

EnvironmentandWater.PreparedbyPeterBrodribb,MichaelMcCann,

Jelena

Franjićand

GraemeDewerson.ExpertGroupSuite12,

2-8StAndrewsStreet,Brighton,

Victoria3186Telephone+61

395929111Web.au©Commonwealthof

Australia2023OwnershipofintellectualpropertyrightsUnlessotherwisenoted,

copyright(andanyotherintellectual

propertyrights)

inthispublicationisownedbytheCommonwealthof

Australia

(referredtoasthe

Commonwealth).CreativeCommonslicenceAllmaterialinthispublicationis

licensedundera

CreativeCommonsAttribution4.0

InternationalLicence

exceptcontentsuppliedbythirdparties,logosandtheCommonwealthCoatofArms.Inquiriesaboutthe

licenceandanyuseof

thisdocumentshould

beemailed

to

copyright@.au.CataloguingdataThispublication(andany

materialsourcedfromit)should

beattributed

as:Heat

pumps

EmergingtrendsintheAustralianmarket,PeterBrodribb,MichaelMcCann,Jelena

Franjicand

GraemeDewerson,reportpreparedfortheDepartmentof

Climate

Change,Energy,the

EnvironmentandWater,Canberra.CCBY4.0.Thispublicationisavailableat

.au/environment/protection/ozone/publications.Departmentof

Climate

Change,Energy,the

EnvironmentandWaterGPOBox

3090

CanberraACT2601Telephone1800900090Web.auDisclaimerThe

viewsandopinionsexpressed

in

thispublicationdonotnecessarilyrepresenttheviews

of

the

AustralianGovernment

orthe

portfolioministersfortheDepartmentofClimate

Change,Energy,the

EnvironmentandWater.The

AustralianGovernmentactingthroughthe

DepartmentofClimate

Change,Energy,the

EnvironmentandWaterhasexercisedduecare

and

skillinpreparingandcompilingtheinformationanddatainthispublication.Notwithstanding,the

Departmentof

Climate

Change,Energy,the

Environmentand

Water,itsemployeesandadvisersdisclaimallliability,includingliabilityfornegligenceandforanyloss,damage,

injury,expenseorcostincurredbyanypersonasaresultofaccessing,

usingorrelyingonanyofthe

informationordatainthispublicationto

the

maximumextentpermittedby

law.AcknowledgementofCountryWeacknowledge

the

TraditionalCustodiansofAustralia

and

theircontinuingconnectionto

land

and

sea,waters,environment

andcommunity.Wepay

ourrespectsto

the

TraditionalCustodiansof

thelands

weliveand

work

on,theirculture,andtheirElders

pastandpresent.DepartmentofClimateChange,Energy,theEnvironmentandWater2Heatpumps

–EmergingtrendsintheAustralian

marketCONTENTS12EXECUTIVESUMMARY..................................................................................................................5INTRODUCTION

..........................................................................................................................72.1

DESCRIPTIONOFTECHNOLOGY..............................................................................................................

72.2

INTERNATIONALOVERVIEW,

THE

KEYDRIVERS,

ANDEMERGINGTECHNOLOGIES.............................................

72.3

TRENDSANDOBSERVATIONSBYREFRIGERANTTYPE................................................................................

102.4

OVERVIEWOFGOVERNMENTINITIATIVESDRIVINGHEATPUMPINSTALLATIONS

...........................................

113OVERVIEWOFHEATPUMPTECHNOLOGIES

......................................................................................

183.1

HEATPUMPCLOTHESDRYERS

.............................................................................................................

183.2

DOMESTIC

HOT

WATER

HEATPUMPS

...................................................................................................

213.3

SWIMMINGPOOLHEATPUMPS...........................................................................................................

263.4

REVERSECYCLEAIRCONDITIONING

......................................................................................................

303.5

COMMERCIALHEATPUMPS

................................................................................................................

363.6

OTHERHEATPUMPTECHNOLOGIES......................................................................................................

424THERISKSOFEMERGINGHEATPUMPS

...........................................................................................

444.1

POTENTIALIMPACTSONTHE

HFC

PHASEDOWN

....................................................................................

444.2

POTENTIALIMPACTONEND-OF-LIFEEMISSIONS.....................................................................................

474.3

PREMATUREPRODUCTFAILUREANDWAVEOFWARRANTIES

....................................................................

48BIBLIOGRAPHY...........................................................................................................................

51APPENDIXA

...............................................................................................................................

56PART1

TAXONOMYOFTECHNOLOGY

.........................................................................................................

56PART2

TECHNICALCHARACTERISTICSBYPRODUCTCATEGORY

........................................................................

58TABLESTable1:Summaryof

technologyopportunitiesfor

newheatpumpequipmentbyGWPthreshold................................................................................................................................................................................................11Table2:Energyefficiency

andrenewableenergyschemesthatareprovidingtangible

incentivesthataredrivingheatpumpactivities......................................................................................................................14Table3:Installationsofhotwaterheatpumps

that

receivedsmall-scaletechnology

certificatesundertheRenewableEnergyTarget

schemein2022.....................................................................................17Table4:Risks

ofdirectemissionsfrom

end-of-life

heatpumps.................................................................48Table5:Air

conditioningandheatpumptaxonomyoftechnology...........................................................57FIGURESFigure1:Salesandprojectionsfordomesticheatpumpclothesdryersfrom

2015to2036.........19Figure2:New

salesmixprojectionbyunitsfordomesticheatpumpclothesdryersfrom

2022to2036......................................................................................................................................................................................20Figure3:Refrigerantbankofheatpumpclothesdryersfrom

2022to2036intonnes....................21Figure4:SalesProjectionbyunitsoftheAustralianhotwater

marketandhotwaterheatpumpsfrom2021to2036..........................................................................................................................................................23DepartmentofClimateChange,Energy,theEnvironmentandWater3Heatpumps

–EmergingtrendsintheAustralian

marketFigure5:New

salesmixprojectionbyunitsfordomestichotwater

heatpumps

from

2022to2036......................................................................................................................................................................................25Figure6:Refrigerantbankofhotwater

heatpumps

from

2022to

2036

intonnes...........................25Figure7:SalesProjectionbyunitsof

swimmingpoolheatpumpsfrom

2021to

2036....................28Figure8:New

salesmixprojectionbyunitsforswimming

poolheatpumpsfrom

2022to2036................................................................................................................................................................................................29Figure9:Refrigerantbankofswimmingpool

heat

pumpsfrom

2022to2036intonnes...............29Figure10:Salesofsingle

split

systemsfrom

2012to2022,and

salesprojectionto2036..............32Figure11:Newsalesmixprojectionbyunitsforsmallair

conditioning(singlesplit:

non-ducted)heatpumpsfrom

2022to

2036

................................................................................................................................33Figure12:Newsalesmixprojectionbyunitsformediumair

conditioning(splitsystem:ducted)heatpumpsfrom

2022to

2036

................................................................................................................................34Figure13:Refrigerantbankofsmallair

conditionernon-ductedsplitsystemsfrom

2022to2036intonnes

.............................................................................................................................................................................35Figure14:Refrigerantbankofmediumair

conditionerfrom2022to2036in

tonnes.....................36Figure

15:Newsalesmixprojectionbyunitsforcommercialheatpumpsfrom2022

to2036...................................................................................................................................................................

41Figure16:Refrigerantbankofcommercialheatpumpsfrom

2022to

2036

intonnes....................42Figure17:HFCPhasedownstepsandrefrigerantusagefrom

2022to2036inMtCO

e................462DepartmentofClimateChange,Energy,theEnvironmentandWater4Heatpumps

–EmergingtrendsintheAustralian

market1

ExecutivesummaryInrecentyears

heatpumpshavebeenrecognisedas

anintegraltechnology

intheglobal

efforttoimproveenergyefficiencyaspartofdecarbonisation.GovernmentsofthelargestandmostadvancedeconomiesinEurope,the

US,Japan,ChinaandAustraliaare

deployingpoliciesandincentiveswhicharedriving

dramaticgrowth

inthetechnologicaladvancement,manufacture,andsalesof

heatpumptechnologiesacrossarange

ofapplications.InAustralia,Governmentsarecontinuingtorollout

programsandincentivesaimedatacceleratingenergyefficiencyimprovements.

Consequently,heatpumpsareplayinganincreasinglylargerroleintheseeffortsacrossbothcommercialandresidential

sectorsinapplicationsincludingspaceheatingandcooling,hotwaterheating,clothesdryersand

swimmingpool

heating.Despitethewelldocumentedadvantagesof

thetechnologyandresultingpositivecontributionstowardsdecarbonisationonagloballevel,heatpumpsdeployedaroundtheworldinincreasingnumbersareprimarilychargedwithhydrofluorocarbon(HFC)refrigerantsthathavehighglobalwarmingpotentials(GWP).TheseHFCs

are

subject

toaninternationalagreementtosignificantlyphasedownproductionandbulkimportsundertheKigaliAmendmenttotheMontrealProtocolonSubstancesthatDepletetheOzoneLayer.Under

theagreement,participating

countries,includingAustralia,arerestrictedbyadiminishingquotasystem

whichlimitsbulkimportsofHFCs.AlthoughHFCs

usedinpre-chargedequipmentareaccountedfor

inthecountryofmanufacture,ongoingservicing,andendof

lifemanagementofthis

growing

technologyrequiresconsideration.Therefore,

thisstudywas

designedto

assessthedemandsonfuturerefrigerantusageto2036withanexpected

increaseinheatpumpdeployment.Asummaryof

keymessagesfrom

thereportareasfollows:•••Australiais

experiencingasurgeof

heatpump

salesthatis

expectedto

continueatleastintothemid-2030sasheatpumpscontinuetoreplacegas

appliancesinbothexistingandnewbuildings.TheadditionalHFCusage

fromthe

surgeinheatpumpsisestimatedtoadd

upto0.071

milliontonnesof

carbondioxideequivalent(MtCO

e),equatingto

around4.4%of2theMontrealProtocollimitof1.622MtCO

e

in2036.2Thelargestemissionrisk

fromthis

equipment–hermeticallysealedheatpumpsandsplit

systemairconditioners

–willbeatendoflife.Thereis

nonationallegislativeapproachtothe

end-of-lifedisposalandrecyclingof

heatpumps,air

conditioningequipmentandrefrigerationequipment.•Todatethere

havebeenfewrestrictionsontheGWPofrefrigerantsin

heatpumpequipmenthoweverthisis

changingwithinternationalandAustralianregulations

andincentivesexpectedto

influence

manufacturers’choice

ofrefrigerantinproductssold

inAustralia,particularly:ooFrom1July2024theAustralianGovernmentwillbantheimportandmanufactureof

smallairconditionersusingrefrigerantwithaGWPover

750.Theamendmentstothe

EuropeanRegulationNo517/2014(the

F-gasregulations).DepartmentofClimateChange,Energy,theEnvironmentandWater5Heatpumps

–EmergingtrendsintheAustralian

marketoThe

VictorianEnergyUpgradesprogram

proposedthathotwaterheatpumpswithrefrigerantswith

aGWPgreaterthan700will

notbeeligibleundertheVictorianEnergyUpgradesprogram

after1July2024(DEWLP2022).DepartmentofClimateChange,Energy,theEnvironmentandWater6Heatpumps

–EmergingtrendsintheAustralian

market2

Introduction2.1

Descriptionof

technologyHeatpumpsusevapourcompressionheattransfertechnologysimilartothatfoundinarefrigerator.Heatpumpsuseelectricityandrefrigeranttoextractheatfromasource,suchas

thesurroundingair,wateror

groundandtransferheat

froma

coolspacetoawarm

space,

makingthecoolspace

coolerand

thewarm

spacewarmer.

Asmostofthe

heatis

transferredratherthangenerated,heatpumpsarefarmoreefficientthanconventionalheating

technologiessuchasboilers,gasheatersorelectric

resistanceheaters,andcanbelessexpensiveto

run.The

mostcommontypeofheatpumpis

theair-to-airheatpumpcommonlyreferredtoas

areverse

cycleair

conditionerorair

sourceheatpump,whichtransfersheat

between

theoutsideairandyour

houseorabuilding.Air-to-waterheatpumpsareanemergingapplication,whenconnectedtoawatertank,thistypeofheatpumpcantransferheatfrom

theoutsideairtoawaterstoragetankwhichsupplieshotwaterforresidentialandcommercialsettings.Examplesofequipmentthatusearefrigerationcyclethat

are

notheatpumps

includedomesticandcommercialrefrigerators;mobileair

conditioners

(exceptin

electricvehicles

whichmayhaveaheatpump);andcommercial

chillers,(exceptfor

multi-function

chillersthat

haveaheatingfunction).InAustraliarecentsales

datashowsthathotwaterheatpumpsarereplacinggasandelectricresistivehotwaterservices,air-to-airheatpumpsarereplacinggas

ducted

heatersandroomspaceheaters,andlargermulti-functionchillerscapableofbothheating

and

coolinghavepotentialtoreplacegasboilersin

commercialapplications.2.2

International

overview,

the

key

drivers,

and

emergingtechnologiesGlobalinitiativestoreduce

greenhouse

gas

(GHG)emissions,byreplacinggasheatingandinefficientelectricaltechnologieswith

heatpumps,

areleadingtoarapiduptakeofavarietyofheatpumptechnologiesaroundtheworld.2.2.1

EuropeHeatpumpsarewidely

seenasoneofthe

most

importanttechnologiesforenergysecurityanddecarbonisingheatinginEurope.SinceRussia’sinvasionofUkraine,the

resultingenergycrisisandrelatedpolicyintervention,manyEuropeanstatesare

continuingtoprioritisearapidtransitionfrom

fossil

fuelstorenewableenergyandelectrification

(RosenowandGibb2023).Insmallandmediumscaleheating

applicationsthatshift

isdriving

demandfor

heatpumps.Arecord3

million

heatpumpsweresoldacrossEuropein2022,a34%increaseon2021andasignificantincreaseonthepreviousaverageannual

growthofapproximately

10%perannumthroughout

mostofthelastdecade(Rosenowand

Gibb2023).TheEuropeanCommissionhasrecentlyopened

its

callforevidenceonits

proposedheatpumpactionplantoacceleratedeploymentofthetechnologyintheEuropeanUnion(EU)withtheDepartmentofClimateChange,Energy,theEnvironmentandWater7Heatpumps

–EmergingtrendsintheAustralian

marketobjectiveof

installingatleast10

million

additionalheatpumpsby2027(Cooling

Post2023d)inlinewithitsREPowerEUplan.TheEuropeanCommissionputforwardtheREPowerEUplan

inMay2022.

Theplanbuildsontheimplementationofthe‘Fitfor55’proposals,whichsupporttheambitiousEUgoalofachievingareductionofatleast55%netgreenhousegasemissionsby2030andclimateneutralityby2050,inline

withtheEuropeanGreen

Deal.Amongthemeasuressupportedbytheplanaredecarbonisingindustry,acceleratingthe

deploymentofrenewablesandboostingenergyefficiencythrough

theuptakeof

heatpumps(Councilof

theEU

2023b).Simultaneousto,andatoddswiththeseplans

foracceleratedheatpumproll

out,

inarecentvoteonamendmentstotheEuropeanRegulationNo517/2014(theF-gasregulations)revisionproposals,theEuropean

Parliament’senvironment

committeevotedtofast-trackthephasedownofhydrofluorocarbon(HFC)refrigerantsinanumberofapplications,includingheatpumps.TherevisedF-gas

regulations,if

implemented,wouldmeanabanonuseofHFCs

from

as

earlyas2026for

someheatpump

types.ThevotepresentsachallengetoEU’sdecarbonisationandenergysecurityambitions,aswellas

theREPowerEUplan,asHFC

refrigerantsareinstrumentaltothefunctioningofheatpumpsandtheproposed

regulationswouldaffectalmost30thousanddifferentmodelsofequipmentcurrentlypresentin

theEuropeanmarket

(APPLia2023).Atthetimeofwriting,negotiationsareongoingbetweenthe

EU

Counciland

EUCommission,howeverfollowingindustryconsultationtherevisedF-GasRegulationincludessome

easing

ofbans

thatseemmoreachievableforindustry.Inaddition,atransitionfrom

HFCs

tolow

globalwarmingpotential(GWP)alternatives,suchashydrocarbons(HC-290)andHFOs,

involvesconsiderationoftrainingof

installers,safety,energyefficiencyand

productaffordability

(CoolingPost2023a,CoolingPost2023b,CoolingPost2023c).Monobloctechnologyis

oneofthe

more

significant

air-to-waterheatpumptechnologies

that

ismakinginroadsintothecolderUKandEuropean

markets.Monoblocrefersto

a‘singleblock’system,whereall

ofthe

components,apartfrom

thehotwater

cylinder,arefittedintoa

heatpumpunitplacedoutside

thebuilding

(HVP2020).

These

self-containedsystemsdonotrequirerefrigerantpipingandcan

beeasily

mountedtotheexteriorof

abuilding

withthehotwaterstorage

cylinderlocatedinsidethe

building

andconnectedbyonlythewater

piping

(Electronics2022).The

monoblocdesignofferssignificantopportunitiesforrefrigerantswithGWPoflessthan

150,suchas

purepropane,HC-290(GWPof3),andHFC/HFOblendR454C(GWPof

148).Althoughthisisagoodtechnology

optionforEuropeandcolderclimatesthatpredominantlyrequireheating,

itdoesn’tnecessarilyprovideagreatopportunityforwarmer

climatessuchas

Australiawherecoolingisthedominantcomfortrequirement,andhydronicheatingsystemsrepresentaverysmallportionofthe

market.From2019to2023,theEU

fundedthe

TRI-HPproject(tri-generationsystems

–heating,coolingandelectricity-basedon

heatpumpswithnaturalrefrigerantsandmultiplerenewableenergysources)aimedatofferingtailoredsolutionsforEuropeanmulti-familybuildingsusingtrigenerationtechnology.

Thisprogram

has

a

goalof

reducingcostsbyupto15%incomparisonwiththeexistinghydronicheatpumptechnologiesanddecreasinggreenhousegasemissionsfromgasboilersandairchillersby75%.Tri-generationsystemsare

typicallybasedonnaturalDepartmentofClimateChange,Energy,theEnvironmentandWater8Heatpumps

–EmergingtrendsintheAustralian

marketrefrigerantheatpumps

coupledwithrenewable

electricity

generators(e.g.,solarphotovoltaic),usingcoldstorage(suchas

aniceslurry),heatandelectricitystoragestoprovideheating,coolingand

electricity.

Theytypicallyutilisethreeenergysources,solar,

groundsourceandambientair,and

includeadvancedcontrols,managing

electricity,

heatandcooling

inawaythatoptimisestheperformanceofthe

system

(European

Commission2019).Althoughanumberof

unique

solutionsforvariousapplicationshavebeendevelopedinEurope,tri-generation

systemsaremostsuitableforbespokeprojectsusinghydronicheating,withlimitedapplicationpotentialinAustralia.

ThisEU

effortis

alreadygeneratingnovelsolutionsanddrivinginnovationin

developmentanddemonstrationoftri-generationapplications.Awatchingbriefshouldbemaintainedlooking

fortechnologiessuitedto

Australianapplicationsincommercial,

industrial,healthandhotelsectors.2.2.2

UnitedStatesofAmericaThe

UnitedStatesofAmerica(US)

isalsotaking

proactivemeasuresto

encourageafastershifttoheatpumptechnology.In

2021the

US

Department

ofEnergylaunchedtheresidential

ColdClimateHeatPumpTechnology

Challengetoacceleratethedeploymentofcoldclimate

heatpumptechnologies

(U.S.DepartmentofEnergy2021).ManufacturersincludingRheem,

Carrier,Daikin,JohnsonControls,

Lennox

andMitsubishiElectricacceptedthe

challengeaimedatreducingthecarbonfootprintofcoldclimateheatingsolutionsbyimprovingefficiencyandaffordability(CoolingPost2023f).The

UnitedStatesDepartmentofDefenserecently

announced

$250million,fundedthroughtheInflationReductionAct,toincreasedomesticproductionof

heatpumps

usingtheDefenseProductionAct(DPA)authoritiesinvokedbyPresidentBidenin2022.TheDPAdeterminationsarepartoftheUS

plantolowerenergycosts,strengthennational

security,andachieveenergyindependencebyreducingdemandfornaturalresources

(U.S.Departmentof

Energy2023).The2022InflationReductionActis

thelargest

step

thatcongresshastakentoaddressclimatechange.Itaims

toreduceAmericans’energy

costs,

create

goodjobsandtransformUS

effortstoaddresstheclimatecrisis.NotonlydoestheInflationReductionActincentiviseindustry,butitalsoprovidesdirect

incentivesforAmericanfamiliesto

decarbonisetheir

homesthroughtheconversionto

cleanerenergy,includingheatpumps

(Barbanell2022).Of

the

US$394billioncommitted,the

InflationReductionActprovidesnearlyUS$9billionfor

home

energyrebateprogramstoelectrifyappliances,

introduce

solarandbatterystorageandretrofitpropertiestomakethemmoreenergyefficient.Qualifying

home

improvementsareeligible

fora

taxcreditofupto30%of

thetotalcost,cappedat

US$1,200annually.Forheatpumps,thecredit

is

capped

atUS$2,000peryear(AEC2023).HeatpumptechnologieslistedaseligibleforrebatesundertheHomeElectrificationProjectQualifiedTechnologiesincludeenergy

starwaterheaters(up

toUSD$1,750),

spaceheating

andcooling(upto

USD$8,000)and

clothesdryers(uptoUSD$840)(U.S.Departmentof

Energyn.d.).2.2.3

ChinaChina

hasbeenworkingto

reduceits

relianceoncoalfordomesticheatingtoimproveindoorandoutdoorairquality,while

movingtowardsheat

pumpsaspartofdecarbonisationplans(China

Daily2022).In2013theChinese

governmentintroducedthe‘AirPollutionPreventionandControlActionPlan’

whichacceleratedtheuseofcentralisedanddistrict

heatingDepartmentofClimateChange,Energy,theEnvironmentandWater9Heatpumps

–EmergingtrendsintheAustralian

marketencouragingaswitchto

cleanerfuels.

Thispolicywasfollowedbythe2017‘CleanWinterHeatingPlan’forNorthernChinaaimedatimproving

urbanairqualityandreducingoverallenergyconsumption,as

wellasreducing

waterand

heatloss

(Universityof

Birmingham

2023).Despitea

slowdown

insalesgrowththereweremoreheatpumps

soldinChinathananyothercountryin2022.Chinaalsohasthe

largestworkforceinthesectorgloballyandoperatesa40%shareoftheworld’sheat

pump

manufacturingcapacity,

makingitthe

world’slargestproducerandexporterofheatpumptechnology,withmostexportsgoing

toEurope.In

NorthernChina,district

heatingdominatesasthemost

commonheatingsolution

incitiesalthoughmanyhouseholdshaveheatpumps

installedfor

spacecooling

andperiodicheating.InSouthernChina,wheretheclimateis

warmerduring

winter,airsourcereversibleunitsarea

widespreadsolutionforspaceheating.Morethan1

millionairsourcedheatpumps

weresoldthroughoutChina

in2022(IEA2022,Monschaueretal.2023).2.3

TrendsandobservationsbyrefrigeranttypeTable1

illustratesthestateoftechnologyreadiness(green,amberandred)forthemainheatpumpequipmentclassestotransitiontolowerGWP

HFCs

oralternativerefrigerants.

Thisframework,

combinedwith

interviewswithtechnicalexpertsfromglobal

equipment

suppliers,formsthebasisforpredictingnewequipmentsalesmixprojectionsto2036,

whichinturninformtheprojectionsof

thefuturecompositionof

the

refrigerantbank.Thesectionsthatfollowprovide

someexamplesto

supportthetechnology

readinessassessmentandalternati

温馨提示

  • 1. 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。图纸软件为CAD,CAXA,PROE,UG,SolidWorks等.压缩文件请下载最新的WinRAR软件解压。
  • 2. 本站的文档不包含任何第三方提供的附件图纸等,如果需要附件,请联系上传者。文件的所有权益归上传用户所有。
  • 3. 本站RAR压缩包中若带图纸,网页内容里面会有图纸预览,若没有图纸预览就没有图纸。
  • 4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
  • 5. 人人文库网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对用户上传分享的文档内容本身不做任何修改或编辑,并不能对任何下载内容负责。
  • 6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
  • 7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。

评论

0/150

提交评论