多场耦合作用下无补偿大口径直埋热力管网的特性研究

多场耦合作用下无补偿大口径直埋热力管网的特性研究摘要：随着城市化进程的不断推进，热力管网的建设已经成为城市基础设施建设的重要方面，而直埋热力管网由于其便于施工和维护的特点，已经成为了热力管网建设的主要形式之一。然而，由于直埋热力管网受到多种耦合作用的影响，如地下水流、土壤温度和负荷变化等，其传热特性和稳定性方面存在着一定的问题和难题。因此，本文通过理论模型和实验研究的方法，对多场耦合作用下无补偿大口径直埋热力管网的特性进行了研究。

研究结果表明，多场耦合作用下无补偿大口径直埋热力管网传热特性受到土壤温度的影响较大，且传热系数与管道埋深、管道直径、热力管网排布方式等因素密切相关。在稳定性方面，热力管网负荷变化对系统稳定性具有较大的影响。通过对热力管网解决方案的探讨和优化，可以有效提高热力管网的传热和稳定性能，为直埋热力管网的应用和推广提供了一定的理论依据和实践指导。

关键词：直埋热力管网、多场耦合作用、传热特性、稳定性、解决方案

Abstract:Withthecontinuousprogressofurbanization,theconstructionofthermalpipenetworkhasbecomeanimportantaspectofurbaninfrastructureconstruction,andthedirect-buriedthermalpipenetworkhasbecomeoneofthemainformsofthermalpipenetworkconstructionduetoitsconvenientconstructionandmaintenance.However,duetotheinfluenceofvariouscouplingeffectssuchasgroundwaterflow,soiltemperatureandloadchanges,thedirect-buriedthermalpipenetworkhassomeproblemsanddifficultiesintermsofheattransfercharacteristicsandstability.Therefore,inthispaper,thecharacteristicsofuncompensatedlarge-diameterdirect-buriedthermalpipenetworkundermulti-fieldcouplingarestudiedbytheoreticalmodelandexperimentalresearch.

Theresearchresultsshowthattheheattransfercharacteristicsofthedirect-buriedthermalpipenetworkundermulti-fieldcouplingaregreatlyinfluencedbysoiltemperature,andtheheattransfercoefficientiscloselyrelatedtofactorssuchaspipelineburialdepth,pipelinediameter,andthermalpipenetworklayout.Intermsofstability,theloadchangesofthethermalpipenetworkhaveagreaterimpactonsystemstability.Throughthediscussionandoptimizationofthesolutionofthethermalpipenetwork,theheattransferandstabilityperformanceofthethermalpipenetworkcanbeeffectivelyimproved,providingacertaintheoreticalbasisandpracticalguidancefortheapplicationandpromotionofdirect-buriedthermalpipenetwork.

Keywords:Direct-buriedthermalpipenetwork,multi-fieldcoupling,heattransfercharacteristics,stability,solutionDirect-buriedthermalpipenetworksystemsarewidelyusedindistrictheatingandcoolingsystemsduetotheirhighenergyefficiencyandlowenvironmentalimpact.However,themulti-fieldcouplingeffectinthesystem,includingheattransfer,fluidflowandmechanicaldeformation,maycauseinstabilityandaffectthesystemoperation.

Toovercomethesechallenges,theheattransfercharacteristicsofthethermalpipenetworkshouldbethoroughlyanalyzedandoptimized.Theheattransfercoefficientandtemperaturedistributionshouldbeinvestigatedunderdifferentoperatingconditionstoensureefficientheattransferandminimizeheatloss.Theimpactofthethermalinsulationlayerontheheattransferperformanceshouldalsobeconsidered.

Furthermore,thestabilityofthethermalpipenetworkshouldbeevaluatedtoavoidpossiblefailuresorleaks.Themechanicaldeformationcausedbythetemperaturechangesandwaterpressureshouldbecarefullymonitoredandcontrolled.Theinteractionbetweenthesoilandtheburiedpipesshouldalsobetakenintoaccounttopreventstructuraldamages.

Tosolvetheseproblems,numericalsimulationandoptimizationtechniquescanbeappliedtoinvestigatethemulti-fieldcouplingeffectinthesystem.TheFiniteElementMethod(FEM)andComputationalFluidDynamics(CFD)canbeusedtomodeltheheattransfer,fluidflow,andmechanicaldeformation.Theoptimizationtechniquescanthenbeappliedtoimprovethesystemperformancebasedonthesimulationresults.

Insummary,thestabilityandheattransferperformanceofdirect-buriedthermalpipenetworksystemscanbeeffectivelyimprovedthroughcarefulanalysisandoptimizationbasedonmulti-fieldcouplingsimulation.Thesefindingsprovidepracticalguidanceforthedesignandoperationofdistrictheatingandcoolingsystems,andpromotetheapplicationanddevelopmentofdirect-buriedthermalpipenetworkinthefutureInadditiontotheimprovementsmentionedabove,therearesomeotherwaystoenhancetheperformanceofdirect-buriedthermalpipenetworksystems.

Firstly,theuseofadvancedinsulationmaterialscangreatlyreduceheatlossandimproveefficiency.High-performanceinsulationmaterialssuchasexpandedgraphite,vacuuminsulationpanels,andaerogelshaveexcellentthermalinsulationproperties,whichcansignificantlyreduceheatlossandimprovethethermalefficiencyofdirect-buriedthermalpipenetworks.

Secondly,theadoptionofenergy-savingcontrolstrategiesisalsoaneffectivewaytooptimizetheperformanceofthesystem.Inthedistrictheatingandcoolingsystem,thecontrolstrategymainlyincludesthetemperaturecontrolstrategyandtheflowcontrolstrategy.Throughtheintelligentcontrolofparameterssuchasflowrate,temperatureandpressure,thesystemcanoperateatoptimalconditionstomaximizetheenergyefficiencyandminimizetheenergyloss.

Lastbutnotleast,theimprovementofsystemmaintenanceandmanagementisalsocrucialfortheperformanceofthedirect-buriedthermalpipenetwork.Regularinspectionsandmaintenanceofthethermalpipenetworkcanhelpidentifyandcorrectpotentialproblemsinatimelymanner,whichcanpreventenergywasteandsystemfailures.Inaddition,theestablishmentofacomprehensivemanagementsystemcaneffectivelymonitorandmanagethesystemoperationandmaintenance,ensuringthenormalandefficientoperationofthesystem.

Inconclusion,theapplicationanddevelopmentofdirect-buriedthermalpipenetworksystemshavesignificanteconomicandenvironmentalbenefits.Byoptimizingthedesign,insulation,controlstrategies,andmaintenance,theperformanceofthesystemcanbeeffectivelyimproved,anditslong-termstableandefficientoperationcanbeguaranteed.Itisbelievedthatwiththecontinuousimprovementoftechnologyandthewidespreadadoptionofthedirect-buriedthermalpipenetworksystem,thefutureofdistrictheatingandcoolingwillbecomemoreenergy-efficient,sustainable,andeconomicallyviableFurthermore,thedirect-buriedthermalpipenetworksystemalsohasseveralenvironmentalbenefits.First,itpromotestheuseofrenewableenergysourcessuchasgeothermalandwasteheat.Thisreducesthedependenceonfossilfuelsand,therefore,helpstomitigateclimatechange.Second,ithelpstoreducegreenhousegasemissionsthatresultfromheatingandcoolingbuildings.Bycentrallyproducingheatandcold,thesystemcanoptimizetheuseofenergyandreduceemissions.Third,thesystemhasalowerenvironmentalimpactcomparedtotraditionalheatingandcoolingsystems.Thisisbecauseitrequiresfewerpipelinesandequipment,whichreducestheneedforlanduseandreducesdisruptiontotheenvironment.

Additionally,thedirect-buriedthermalpipenetworksystemcanalsoleadtoeconomicbenefits.First,itcanreduceenergycostsforboththeend-usersandtheoperatorsofthesystem.Byutilizingrenewableenergysourcesandoptimizingtheenergyuse,thesystemcanprovideaffordableheatingandcoolingservicestoend-users.Second,itcancreatenewbusinessopportunitiesandjobsintherenewableenergyandenergyefficiencysectors.Third,itcanincreasethevalueofrealestatepropertiesconnectedtothesystemduetothereliableandefficientprovisionofheatingandcoolingservices.

Inconclusion,thedirect-buriedthermalpipenetworksystemisapromisingtechnologyfordistrictheatingandcooling.Ithasseveraladvantagessuchasenergyefficiency,sustainability,andenvironmentalbenefits.Furthermore,itcanalsoleadtoeconomicbenefitssuchasreducedenergycostsandthecreationofnewjobs.However,tofullyrealizethepotentialofthesystem,itisessentialtooptimizethedesign,insulation,controlstrategies,andmaintenancet