版權(quán)說明:本文檔由用戶提供并上傳,收益歸屬內(nèi)容提供方,若內(nèi)容存在侵權(quán),請(qǐng)進(jìn)行舉報(bào)或認(rèn)領(lǐng)
文檔簡(jiǎn)介
HowSolarHeatingSystemWorks???Asolarwaterheatingsystemcomprisessolarcollectors,astoragetank
and
interconnectingpipework.Thesolarcollectorsareusuallymountedonroofofabuildingtocapturesolarradiation.Smalltubesrunthroughthesolarcollectorsandcarryliquid–eitherwaterorheattransferliquidwithlowboilingpoint.Theheatpipeabsorbsheatfromthesolarcollectorsandtransfersheattoincomingwater.HowSolarHeatingSystemWorks1Benefits
ofsolarwaterheating
Hotwaterthroughouttheyear:thesystemworksallyearround,thoughyou'llneedtoheatthewaterfurtherwithaboilerorimmersionheaterduringthewintermonths.Cutyourbills:sunlightisfree,soonceyou'vepaidfortheinitialinstallationyourhotwatercostswillbereduced.
Cutyourcarbonfootprint:solarhotwaterisagreen,renewableheatingsystemandcanreduceyourcarbondioxideemissionsBenefitsofsolarwaterheatin2Ingeneral,solarwaterheatingsystemsfallsinto2types:Activeand
Passive.Common
TypesofSolarWaterHeatingSystemsAnactivesystemusesanelectricpumptocirculatewaterorheattransferfluidfromstoragetanksthroughthecollector.Whereasapassivesystemreliesongravity
andthetendencyforwatertonaturallycirculateasitisheated,allowingwaterorheattransferfluidtomovethroughthesystemwithouttheuseofacirculatingpump.Ingeneral,solarwaterheatin3Activesolarwaterheatingsystems:Activesolarwaterheatingsystemsarecharacterizedaseitherdirect(alsocalled“openloop”)orindirect(alsocalledclosedloop)dependingonwhethertheincomingwaterisheateddirectlyinthecollectorsorindirectlyheatedviaaheatexchanger.Activesolarwaterheatingsys4AutomaticsolarcontrollerTemperaturesensoroncollectorTemperaturesensoronstoragetankSolarcirculationpumpColdwaterinflowHotwaterrun-offTemperaturesensorforadditionalheatingElementsofasolarheatingsystemforhotwater:DirectsolarheatingsystemPumpscirculatehouseholdwaterthroughthecollectorsandintothehome.Theyworkwellinclimateswhereitrarelyfreezes.AutomaticsolarcontrollerEl5ActiveindirectwaterheaterAlsoknownasanactiveclosed-loopsystem,asolarheaterthatcirculatesafluidotherthanwater(suchasdilutedantifreeze)throughacollector.Thecollectedheatistransferredtothehouseholdwatersupplyusingaheatexchanger.Indirectsolarwaterheatersarepopularinclimatespronetofreezingtemperatures.
ActiveindirectwaterheaterAl6Passivesolarwaterheatingsystems:Integralcollector-storagepassivesystem
ThermosyphonsystemPassivesolarwaterheatingsy7
AthermosyphonsystemAthermosyphonsystem,alsoknownasapassivesystem,doesnotrequireapumptocirculatethewaterbutinsteadreliesondensitydifferentialswherethewarmerwaterrisestothehighestpoint.Forthissystemtofunctionthetankmustbemountedabovethecollector,relativetothehorizontal.
AthermosyphonsystemAthermo8ComparisonbetweenActiveandPassiveheatingsystemsAdvantageofActiveoverPassive(Thermosyphon)AdvantageofPassive(Thermosyphon)overActiveGreatercontroloversystemSimpleSystemsetupSuperiorefficiencyMoreCostEffectiveFlexibilityinpositioningofstoragetankOperateswithoutpowerEasiertoovercomefreezingCanbeusedwithbothlowpressure
andhighpressuresystemsComparisonbetweenActiveand9TheMainFactorsthatgovernthechoiceoftypesofsystemtobeinstalledincludetheclimaticcondition,hotwaterdemand,sizeofthesystemandspaceavailabilityforplacingextracomponents,etc.Forexample,lowmaintenancedirectsystemcanbeusedinsmallerfacilitieswithlowhotwaterdemandwhereasactiveindirectsystemisusuallyinstalledinlargerfacilitieswithhigherhotwaterdemand.TheMainFactorsthatgove10
MaintenanceandExpectedLifeThemaintenancerequirementsforsolarwaterheatingsystemvarydependingonthesystemconfiguration.Ingeneral,solarthermalcollectorshavenomovingpartsandthemaintenancerequirementsareverylow.Awell-made,properlymaintainedsystemshouldlast15to20yearsormore.MaintenanceandExpectedLife11IssuestobeconsideredwheninstallingsolarwaterheatingsystemSolarCollectorsOrientationSolarcollectorsneededtobelocatedwhereplentyofsunshinestrikesitssurface.Solarcollectorscanbemountedfromhorizontaltoaninclinedangle.Tomaximizetheamountofannualsolarenergythatsolarcollectorscanreceive,theyshouldbeideallytiltedatlatitude(around37oinJinan)ofthelocationonasouth-facingroof.Itisalsonecessarytoavoidobstructionssuchasbuildingsortrees,etcthatcouldpreventsolarcollectorsfromsolarcollectorsgettingadequateexposuretosolarradiation.Issuestobeconsideredwheni12TypesofSolarCollectors:SolarCollectorsFlat-platesolarcollectorsEvacuatedtubesolarcollectorsTypesofSolarCollectors:Sola13
Flat-plateSolarCollectorsFlat-platecollectorsarethemostcommonsolarcollectorsforuseinsolarwater-heatingsystemsinhomesandinsolarspaceheating.Aflat-platecollectorconsistsbasicallyofaninsulatedmetalboxwithaglassorplasticcover(theglazing)andadark-coloredabsorbingplate.Solarradiationisabsorbedbytheabsorbingplateandtransferredtoafluidthatcirculatesthroughthecollectorintubes.
Sketchofflat-platecollectorFlat-plateSolarCollectorsFl14
DirectflowevacuatedtubecollectorsTheseconsistofagroupofglasstubesinsideeachofwhichisaflatorcurvedaluminumfinattachedtoametal(usuallycopper)orglassabsorberpipe.Thefiniscoveredwithaselectivecoatingthatabsorbssolarradiationwellbutinhibitsheatloss.Theheattransferfluidiswaterandcirculatesthroughthepipes,oneforinletfluidandtheotherforoutletfluid
Directflowevacuatedtubeco15HeatpipeevacuatedtubeCollectors.TheVacuumSolarTube
absorbsthesolarenergyandtransferintotheheatenergy,thenpassittotheheatpipe,whichtransfertheheattotheworkingmedia.Thereisnowaterinthevacuumtube,sothetubewillnotbreakinwater,itissteadyandcredibleandcanbecombinedwiththearchitectureperfectly.Itcanbecombinedwithexistingpipelineandevenoperateintheeventofoccasionaltubebreakages.HeatpipeevacuatedtubeColle16FlatplatecollectorsVS
EvacuatedtubecollectorsCheaperMoreefficientLongerservicelifeNofreezeEasyinstallationBetterperformanceincloudydaysClimatelimitationMorereliableFlatplatecollectorsareGood,EvacuatedtubecollectorsareBetter!!!FlatplatecollectorsVSEvacu17VacuumSolarTube:WhatIsSolarCollectorTubeThevacuumsolarcollectortubeisasimpleandeffectiveenergyconverter,whichabsorbsthesolarenergyandconvertsitintoheatforuseviatheselectiveabsorbingcoating.?VacuumSolarTube:WhatIsSola18
Eachevacuatedtubeconsistsoftwo
glasstubesmadefromextremelystrongborosilicateglass.Theoutertubeistransparentallowinglightraystopassthroughwithminimalreflection.Theinnertubeiscoatedwithaspecialselectivecoatingwhichfeaturesexcellentsolarradiationabsorptionandminimalreflectionproperties.Thetopofthetwotubesarefusedtogetherandtheaircontainedinthespacebetweenthetwolayersofglassispumpedoutwhileexposingthetubetohightemperatures.This"evacuation"ofthegassesformsavacuum,whichisanimportantfactorintheperformanceoftheevacuatedtubes.
Eachevacuatedtubeconsi19
Inordertomaintainthevacuumbetweenthetwoglasslayers,abariumgetterisused.Duringmanufactureoftheevacuatedtubethisgetterisexposedtohightemperaturewhichcausesthebottomoftheevacuatedtubetobecoatedwithapurelayerofbarium.ThisbariumlayeractivelyabsorbsanyCO,CO2,N2,O2,H2Ofromthetube,thushelpingtomaintainingthevacuum.Thesilvercoloredbariumlayerwillturnwhiteifthevacuumiseverlost.
Inordertomaintainthe20BasicSpecificationsofEvacuatedtube
Length(nominal)1500/1800mmOutertubediameter58mmInnertubediameter47mmTubethickness1.6mmMaterialBorosilicateGlass3.3AbsorbingcoatingGradedAl-N/AlAbsorption>92%(AM1.5)Emission<8%(80℃)VacuumP<3.0x10-3PaStagnationtemperature>230℃Heatloss<0.8W/(m2℃)Maximumstrength0.6MPaBasicSpecificationsofEvacua21All-glassevacuatedsolarcollectortubesProduction:
pull-seal(拉封)innertube&outertube
rinsing(清洗):deionizedwater
drying(烘干):140℃,30minutes
coating(鍍膜):onetarget&threetargetsealing(封口):fuse
annealing(退火):eliminatestress
evacuating(排氣):1hour,P<3.0x10-3Pa
firing(烤消):getter,extraair
packing(包裝):cartonwithfoam
inspection(質(zhì)檢)All-glassevacuatedsolarcoll22Coating(鍍膜):Coatingmethod:
磁控濺射鍍膜
One-targetcoating(單靶鍍膜)blue,red,black
Three-targetcoating(三靶鍍膜)blue,black,redCoatingtypes:
Double-target(雙靶鍍膜)Ti-tube,purple
Coatinglayers:absorptionlayer(SS-ALN)reflectionlayer(copper)anti-reflectionlayer(ALN)Coating(鍍膜):Coatingmethod:磁23IndictorsofevacuatedcollectortubesperformanceAbsorptionrateEmissionrateCoefficientofaverageheatlossVacuumqualityWatertemperatureStagnationtemperatureIndictorsofevacuatedcollect24CommonqualityDefects:Scratches:appearance
Shatteredcoatingfilm:thermalperformanceUnevencoatingcolor:appearanceBlackmirrorsurface:thermalperformanceCommonqualityDefects:Scratc25Heatpipes:
Aheatpipeisatwo-phaseheattransferdevicewithanextremelyhigheffectivethermalconductivity.Theheatpipeisevacuatedandbackfilledwithasmallquantityofaworkingfluidsuchaswater,acetone,nitrogen,methanol,ammonia,orsodium.
Heatpipes:Aheatpipeis26Heatpipes:
Aheatpipeusuallycomprisestwocoppercomponents:theshaftandthecondenser.Priortoevacuation,thecondenserisbrazedtotheshaft.Boilingpoint:30oC(86oF)Freezingpoint:0oC(32oF).Heatpipes:Aheatpipeusuall27HeatPipes
Productioncondenserheatpipepiperinsingweldingvacuumextraction
fluidinjectionpipesealingHeatPipesProductioncondense28ThankyouJuly02,2011ThankyouJuly02,201129HowSolarHeatingSystemWorks???Asolarwaterheatingsystemcomprisessolarcollectors,astoragetank
and
interconnectingpipework.Thesolarcollectorsareusuallymountedonroofofabuildingtocapturesolarradiation.Smalltubesrunthroughthesolarcollectorsandcarryliquid–eitherwaterorheattransferliquidwithlowboilingpoint.Theheatpipeabsorbsheatfromthesolarcollectorsandtransfersheattoincomingwater.HowSolarHeatingSystemWorks30Benefits
ofsolarwaterheating
Hotwaterthroughouttheyear:thesystemworksallyearround,thoughyou'llneedtoheatthewaterfurtherwithaboilerorimmersionheaterduringthewintermonths.Cutyourbills:sunlightisfree,soonceyou'vepaidfortheinitialinstallationyourhotwatercostswillbereduced.
Cutyourcarbonfootprint:solarhotwaterisagreen,renewableheatingsystemandcanreduceyourcarbondioxideemissionsBenefitsofsolarwaterheatin31Ingeneral,solarwaterheatingsystemsfallsinto2types:Activeand
Passive.Common
TypesofSolarWaterHeatingSystemsAnactivesystemusesanelectricpumptocirculatewaterorheattransferfluidfromstoragetanksthroughthecollector.Whereasapassivesystemreliesongravity
andthetendencyforwatertonaturallycirculateasitisheated,allowingwaterorheattransferfluidtomovethroughthesystemwithouttheuseofacirculatingpump.Ingeneral,solarwaterheatin32Activesolarwaterheatingsystems:Activesolarwaterheatingsystemsarecharacterizedaseitherdirect(alsocalled“openloop”)orindirect(alsocalledclosedloop)dependingonwhethertheincomingwaterisheateddirectlyinthecollectorsorindirectlyheatedviaaheatexchanger.Activesolarwaterheatingsys33AutomaticsolarcontrollerTemperaturesensoroncollectorTemperaturesensoronstoragetankSolarcirculationpumpColdwaterinflowHotwaterrun-offTemperaturesensorforadditionalheatingElementsofasolarheatingsystemforhotwater:DirectsolarheatingsystemPumpscirculatehouseholdwaterthroughthecollectorsandintothehome.Theyworkwellinclimateswhereitrarelyfreezes.AutomaticsolarcontrollerEl34ActiveindirectwaterheaterAlsoknownasanactiveclosed-loopsystem,asolarheaterthatcirculatesafluidotherthanwater(suchasdilutedantifreeze)throughacollector.Thecollectedheatistransferredtothehouseholdwatersupplyusingaheatexchanger.Indirectsolarwaterheatersarepopularinclimatespronetofreezingtemperatures.
ActiveindirectwaterheaterAl35Passivesolarwaterheatingsystems:Integralcollector-storagepassivesystem
ThermosyphonsystemPassivesolarwaterheatingsy36
AthermosyphonsystemAthermosyphonsystem,alsoknownasapassivesystem,doesnotrequireapumptocirculatethewaterbutinsteadreliesondensitydifferentialswherethewarmerwaterrisestothehighestpoint.Forthissystemtofunctionthetankmustbemountedabovethecollector,relativetothehorizontal.
AthermosyphonsystemAthermo37ComparisonbetweenActiveandPassiveheatingsystemsAdvantageofActiveoverPassive(Thermosyphon)AdvantageofPassive(Thermosyphon)overActiveGreatercontroloversystemSimpleSystemsetupSuperiorefficiencyMoreCostEffectiveFlexibilityinpositioningofstoragetankOperateswithoutpowerEasiertoovercomefreezingCanbeusedwithbothlowpressure
andhighpressuresystemsComparisonbetweenActiveand38TheMainFactorsthatgovernthechoiceoftypesofsystemtobeinstalledincludetheclimaticcondition,hotwaterdemand,sizeofthesystemandspaceavailabilityforplacingextracomponents,etc.Forexample,lowmaintenancedirectsystemcanbeusedinsmallerfacilitieswithlowhotwaterdemandwhereasactiveindirectsystemisusuallyinstalledinlargerfacilitieswithhigherhotwaterdemand.TheMainFactorsthatgove39
MaintenanceandExpectedLifeThemaintenancerequirementsforsolarwaterheatingsystemvarydependingonthesystemconfiguration.Ingeneral,solarthermalcollectorshavenomovingpartsandthemaintenancerequirementsareverylow.Awell-made,properlymaintainedsystemshouldlast15to20yearsormore.MaintenanceandExpectedLife40IssuestobeconsideredwheninstallingsolarwaterheatingsystemSolarCollectorsOrientationSolarcollectorsneededtobelocatedwhereplentyofsunshinestrikesitssurface.Solarcollectorscanbemountedfromhorizontaltoaninclinedangle.Tomaximizetheamountofannualsolarenergythatsolarcollectorscanreceive,theyshouldbeideallytiltedatlatitude(around37oinJinan)ofthelocationonasouth-facingroof.Itisalsonecessarytoavoidobstructionssuchasbuildingsortrees,etcthatcouldpreventsolarcollectorsfromsolarcollectorsgettingadequateexposuretosolarradiation.Issuestobeconsideredwheni41TypesofSolarCollectors:SolarCollectorsFlat-platesolarcollectorsEvacuatedtubesolarcollectorsTypesofSolarCollectors:Sola42
Flat-plateSolarCollectorsFlat-platecollectorsarethemostcommonsolarcollectorsforuseinsolarwater-heatingsystemsinhomesandinsolarspaceheating.Aflat-platecollectorconsistsbasicallyofaninsulatedmetalboxwithaglassorplasticcover(theglazing)andadark-coloredabsorbingplate.Solarradiationisabsorbedbytheabsorbingplateandtransferredtoafluidthatcirculatesthroughthecollectorintubes.
Sketchofflat-platecollectorFlat-plateSolarCollectorsFl43
DirectflowevacuatedtubecollectorsTheseconsistofagroupofglasstubesinsideeachofwhichisaflatorcurvedaluminumfinattachedtoametal(usuallycopper)orglassabsorberpipe.Thefiniscoveredwithaselectivecoatingthatabsorbssolarradiationwellbutinhibitsheatloss.Theheattransferfluidiswaterandcirculatesthroughthepipes,oneforinletfluidandtheotherforoutletfluid
Directflowevacuatedtubeco44HeatpipeevacuatedtubeCollectors.TheVacuumSolarTube
absorbsthesolarenergyandtransferintotheheatenergy,thenpassittotheheatpipe,whichtransfertheheattotheworkingmedia.Thereisnowaterinthevacuumtube,sothetubewillnotbreakinwater,itissteadyandcredibleandcanbecombinedwiththearchitectureperfectly.Itcanbecombinedwithexistingpipelineandevenoperateintheeventofoccasionaltubebreakages.HeatpipeevacuatedtubeColle45FlatplatecollectorsVS
EvacuatedtubecollectorsCheaperMoreefficientLongerservicelifeNofreezeEasyinstallationBetterperformanceincloudydaysClimatelimitationMorereliableFlatplatecollectorsareGood,EvacuatedtubecollectorsareBetter!!!FlatplatecollectorsVSEvacu46VacuumSolarTube:WhatIsSolarCollectorTubeThevacuumsolarcollectortubeisasimpleandeffectiveenergyconverter,whichabsorbsthesolarenergyandconvertsitintoheatforuseviatheselectiveabsorbingcoating.?VacuumSolarTube:WhatIsSola47
Eachevacuatedtubeconsistsoftwo
glasstubesmadefromextremelystrongborosilicateglass.Theoutertubeistransparentallowinglightraystopassthroughwithminimalreflection.Theinnertubeiscoatedwithaspecialselectivecoatingwhichfeaturesexcellentsolarradiationabsorptionandminimalreflectionproperties.Thetopofthetwotubesarefusedtogetherandtheaircontainedinthespacebetweenthetwolayersofglassispumpedoutwhileexposingthetubetohightemperatures.This"evacuation"ofthegassesformsavacuum,whichisanimportantfactorintheperformanceoftheevacuatedtubes.
Eachevacuatedtubeconsi48
Inordertomaintainthevacuumbetweenthetwoglasslayers,abariumgetterisused.Duringmanufactureoftheevacuatedtubethisgetterisexposedtohightemperaturewhichcausesthebottomoftheevacuatedtubetobecoatedwithapurelayerofbarium.ThisbariumlayeractivelyabsorbsanyCO,CO2,N2,O2,H2Ofromthetube,thushelpingtomaintainingthevacuum.Thesilvercoloredbariumlayerwillturnwhiteifthevacuumiseverlost.
Inordertomaintainthe49BasicSpecificationsofEvacuatedtube
Length(nominal)1500/1800mmOutertubediameter58mmInnertubediameter47mmTubethickness1.6mmMaterialBorosilicateGlass3.3Absorbingcoatin
溫馨提示
- 1. 本站所有資源如無(wú)特殊說明,都需要本地電腦安裝OFFICE2007和PDF閱讀器。圖紙軟件為CAD,CAXA,PROE,UG,SolidWorks等.壓縮文件請(qǐng)下載最新的WinRAR軟件解壓。
- 2. 本站的文檔不包含任何第三方提供的附件圖紙等,如果需要附件,請(qǐng)聯(lián)系上傳者。文件的所有權(quán)益歸上傳用戶所有。
- 3. 本站RAR壓縮包中若帶圖紙,網(wǎng)頁(yè)內(nèi)容里面會(huì)有圖紙預(yù)覽,若沒有圖紙預(yù)覽就沒有圖紙。
- 4. 未經(jīng)權(quán)益所有人同意不得將文件中的內(nèi)容挪作商業(yè)或盈利用途。
- 5. 人人文庫(kù)網(wǎng)僅提供信息存儲(chǔ)空間,僅對(duì)用戶上傳內(nèi)容的表現(xiàn)方式做保護(hù)處理,對(duì)用戶上傳分享的文檔內(nèi)容本身不做任何修改或編輯,并不能對(duì)任何下載內(nèi)容負(fù)責(zé)。
- 6. 下載文件中如有侵權(quán)或不適當(dāng)內(nèi)容,請(qǐng)與我們聯(lián)系,我們立即糾正。
- 7. 本站不保證下載資源的準(zhǔn)確性、安全性和完整性, 同時(shí)也不承擔(dān)用戶因使用這些下載資源對(duì)自己和他人造成任何形式的傷害或損失。
最新文檔
- Unit 7 Are these bears?(教學(xué)設(shè)計(jì))-2023-2024學(xué)年陜旅版(三起)英語(yǔ)三年級(jí)上冊(cè)
- 化學(xué)氣相沉積硒化鋅(CVDZNSE)晶體行業(yè)商業(yè)計(jì)劃書
- 九年級(jí)歷史下冊(cè) 第一單元 第1課《“電氣時(shí)代”的到來》教案4 華東師大版
- 八年級(jí)生物下冊(cè) 第9單元 保護(hù)人類與其他生物的公同家園 第26章 第2節(jié)《保護(hù)生物多樣性》教案5 (新版)蘇科版
- (新教材)2024-2025學(xué)年統(tǒng)編版語(yǔ)文七年級(jí)上冊(cè) 1 春 教案2
- 中小學(xué)生安全教育課中小學(xué)生安全第一課
- 廣東專用高考物理二輪復(fù)習(xí) 專題突破七 熱學(xué)和原子物理
- 2025年山東省廣饒第一中學(xué)高三練習(xí)三(全國(guó)卷I)生物試題含解析
- 2025年閩粵贛高三下學(xué)期周練一(2.15)生物試題含解析
- 七年級(jí)安全教育教案大全
- 列車車鉤緩沖裝置-列車鉤緩裝置結(jié)構(gòu)
- Part1-2 Unit6 Craftsmanship課件-【中職專用】高一英語(yǔ)精研課堂(高教版2021·基礎(chǔ)模塊2)
- 審計(jì)項(xiàng)目應(yīng)急預(yù)案及措施
- 小學(xué)四年級(jí)心理健康 我的時(shí)間我做主 課件
- 小學(xué)科學(xué)知識(shí)競(jìng)賽試題
- 鋼筆硬筆書法基本筆畫偏旁部首與間架結(jié)構(gòu)及變化課件
- 醫(yī)院布草洗滌服務(wù)方案(技術(shù)方案)
- 承諾書(標(biāo)準(zhǔn)模板)
- 氮及其氧化物高三化學(xué)一輪復(fù)習(xí)
- 11ZJ901-室外裝修及配件
- 國(guó)內(nèi)外質(zhì)量管理研究現(xiàn)狀及我國(guó)企業(yè)質(zhì)量管理策略論文
評(píng)論
0/150
提交評(píng)論