1、BRITISH STANDARD BS EN 14240:2004 Ventilation for buildings Chilled ceilings Testing and rating The European Standard EN 14240:2004 has the status of a British Standard ICS 91.140.30 BS EN 14240:2004 This British Standard was published under the authority of the Standards Policy and Strategy Committ
2、ee on 29 January 2004 BSI 29 January 2004 ISBN 0 580 43362 9 National foreword This British Standard is the official English language version of EN 14240:2004. The UK participation in its preparation was entrusted to Technical Committee RHE/2, Air distribution and air diffusion, which has the respon
3、sibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “Int
4、ernational Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a
5、British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related internationa
6、l and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 18, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last
7、issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN14240 January2004 ICS91.140.30 Englishversion VentilationforbuildingsChilledceilingsTestingandrating VentilationdebtimentsPlafondsrefroidisEssaiset valuation LftungvonGebudenKhldeckenPr
8、fungund Bewertung ThisEuropeanStandardwasapprovedbyCENon3November2003. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnat
9、ional standardsmaybeobtainedonapplicationtotheCentralSecretariatortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheCentralSecretariathasthesamestat
10、usast heofficial versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,Cyprus,CzechRepublic,Denmark,Estonia,Finland,France, Germany,Greece,Hungary,Iceland,Ireland,Italy,Latvia,Lithuania,Luxembourg,Malta,Netherlands,Norway,Poland,Portugal, Slovakia, Slovenia,Spain,Sweden,SwitzerlandandUn
11、itedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2004CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN14240:2004:EEN14240:2004(E) 2 Contents page F
12、oreword.3 1 Scope .4 2 Normativereferences .4 3 Terms,definitionsandsymbols 4 3.1 Termsanddefinitions . .4 3.2 Symbolsandunits. .6 4 Testmethod . .7 4.1 Principle.7 4.2 Testroom. 7 4.3 Instrumentation.8 4.4 Testprocedure 8 5 Uncertainty 11 5.1 Measurement.11 5.2 Testroomconfiguration . .11 6 Testrep
13、ort . 11 AnnexA (informative) GuidanceontheeffectsofActiveAreaRatio18EN14240:2004(E) 3 Foreword Thisdocument(EN14240:2004)hasbeenpreparedbyTechnicalCommitteeCEN/TC156“Ventilation forbuildings“,thesecretariatofwhichisheldbyBSI. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypubl
14、icationofan identicaltextorbyendorsement,atthelatestbyJuly2004,andconflictingnationalstandardsshallbe withdrawnatthelatestbyJuly2004. AnnexAisinformative. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsofthe followingcountriesareboundtoimplementthisEuropeanStandard:Aus
15、tria,Belgium,Cyprus,Czech Republic,Denmark,Estonia,Finland,France,Germany,Greece,Hungary,Iceland,Ireland,Italy,Latvia, Lithuania,Luxembourg,Malta,Netherlands,Norway,Poland,Portugal,Slovakia,Slovenia,Spain, Sweden,SwitzerlandandUnitedKingdom.EN14240:2004(E) 4 1Scope ThisEuropeanStandardspecifiestestc
16、onditionsandmethodsforthedeterminationofthecooling capacityofchilledceilingsandotherextendedchilledsurfaces. Thepurposeofthestandardistogivecomparableandrepeatableproductdata. Thetestmethodappliestoalltypesofsurfacecoolingsystemsusinganymediumasenergytransport medium. NOTE Theresultisvalidonlyforthe
17、specifiedtestsetup.Forotherconditions(i.e.differentpositionsofheat loads,forcedflowaroundthetestobject,variationsinsurfacearea)theproducershouldgiveguidancebasedonfull scaletests. Thisstandardreferstowaterasthecoolingmediumthroughout,howeverwhereverwaterisspecifiedany othercoolingmediumcanalsobeused
18、inthetest.Whereairisthetransportmediumthisairmaynotbe dischargedintothetestroom.Inaddition,thisstandardreferstochilledsurfacesandwhere“surfaces” arespecifiedthisshouldbetakentoincludeceiling,wallorfloorasappropriate. 2 Normativereferences ThisEuropeanStandardincorporates,bydatedorundatedreference,pr
19、ovisionsfromotherpublications. Thesenormativereferencesarecitedattheappropriateplacesinthetext,andthepublicationsarelisted hereafter.Fordatedreferences,subsequentamendmenttoorrevisionsofanyofthesepublicationsapplyto thisEuropeanStandardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferenc
20、esthe latesteditionofthepublicationreferredtoapplies(includingamendments). EN12792, VentilationforbuildingsSymbols,terminologyandgraphicalsymbols. 3 Terms,definitionsandsymbols 3.1 Termsanddefinitions ForthepurposesofthisEuropeanStandard,thetermsanddefinitionsinEN12792togetherwiththe followingapply.
21、 3.1.1 chilledsurfaces surfacesthatarepartoftheroomperiphery(suchasceiling,wallsandfloor)andcooledwithwater 3.1.2 testroom roominwhichthetestobjectismounted 3.1.3 roomairtemperature( qq a ) airtemperaturemeasuredwithradiationshieldedsensor 3.1.4 globetemperature( qq g ) dryresultanttemperatureofther
22、oom,measuredwithatemperaturesensorplacedinthecentreofthe globeasin4.3EN14240:2004(E) 5 3.1.5 referenceroomtemperature( qq r ) averageofthemeasuredglobetemperature,measuredinthemiddleoftheroomataheightof1,1m abovethefloor,duringthetestperiod 3.1.6 coolingwaterflowrate( q w ) averageofthemeasuredwater
23、flowrateduringthetestperiod 3.1.7 coolingwaterinlettemperature( qq w1 ) averageofthemeasuredwatertemperatureintothetestobjectduringthetestperiod 3.1.8 coolingwateroutlettemperature( qq w2 ) averageofthemeasuredwatertemperatureoutofthetestobjectduringthetestperiod 3.1.9 meancoolingwatertemperature( q
24、q w ) themeanvalueofthesumofthecoolingwaterinletandoutlettemperatures 3.1.10 temperaturedifference( D qq ) differencebetweenreferenceroomtemperatureandmeancoolingwatertemperature Dq =q r q w 3.1.11 specificheatcapacity( c p ) heatrequiredtoraisethetemperatureofaunitmassofthecoolingmediumby1K NOTE cp
25、 forwater=4,187kJkg 1 K 1 at15C. 3.1.12 testroomarea( A t ) areaofthetestroomsurface(ceiling,wallorfloor)onwhichthetestobjectislocated(seeFigure1). 3.1.13 installationarea( A i ) projectionofthetotaltestobjectontotheroomsurface,includingallintermediatesurfacechannel supportsandairgaps,associatedwith
26、normalpanelinstallation(seeFigure1) 3.1.14 panelarea( A p ) projectionofthepanelsontotheroomsurface,excludingintermediatesurfacechannelsupportsandair gapsassociatedwithnormalpanelinstallation(seeFigure1) 3.1.15 activearea( A a ) referenceareatocalculatethespecificcoolingcapacityofthetestobject(seeFi
27、gure2) 3.1.16 coolingcapacity( P) totalcoolingcapacityofthetestobjectcalculatedfromthemeasuredcoolingwaterflowrateandthe coolingwatertemperaturerise 3.1.17 specificcoolingcapacityofachilledsurface( P a ) coolingcapacitydividedbytheactiveareaofthechilledsurface 3.1.18 nominaltemperaturedifference( D
28、qq N ) temperaturedifferencebetweenthereferenceroomtemperatureandthemeancoolingwatertemperatureEN14240:2004(E) 6 3.1.19 nominalcoolingwaterflowrate( q wN ) flowratethatgivesacoolingwatertemperatureriseof(20,2)Katthenominaltemperaturedifference of8K 3.1.20 nominalcoolingcapacity( P N ) coolingcapacit
29、ycalculatedfromthecurveofbestfitforthenominalcoolingwaterflowrateatthenominal temperaturedifference( D q N ) 3.2 Symbolsandunits ForthepurposesofthisEuropeanStandard,thesymbolsinCR12792togetherwiththosegiveninTable1 apply. Table1Symbolsandunits Symbol Quantity Unit A a Activearea m 2 A i Projectiona
30、reaofthetotaltestobjectontotheroomsurface m 2 A p Projectionareaofthepanelsontotheroomsurface m 2 A t Areaoftestroomsurface m 2 c p h Specificheatcapacity Heightfromfloortoundersideoffalseceiling h = h r h v KJkg 1 K 1 m h r Insideroomheightincludingvoiddepth m h v Voiddepth m l r Insideroomlength m
31、 n r Numberofdummiesinonerow P Totalcoolingcapacity P =c p q m ( q w2 q w1 ) W P a P i P t Specificcoolingcapacityreactivearea P a = P/A a Specificcoolingcapacityreprojectionareaoftotaltestobject P i = P/A i Specificcoolingcapacityreareaoftestroomsurface P t = P/A t Wm 2 Wm 2 Wm 2 P B Totalthermaltr
32、ansferthroughallboundaries W P N Nominalcoolingcapacity W P(R a ) Statementofmeasuredperformancefortestedactivearea R a Forexampleexpressedas P(85) Wm 2 P s Totalheatingcapacityofthedummies W P t Specificcoolingcapacity P t = P/A t Wm 2 q m Coolingmediummassflow q m = r w .q w Kgh 1 q w Coolingmediu
33、mflowrate Lh 1 R a Activearearatio A a / A i x100 % s Thicknessofinsulation m w r Insideroomwidth m r w Densityofcoolingmediumat q w Kgl 1 q a Roomairtemperature C D q Temperaturedifference K D q N Nominaltemperaturedifference D q N = q r q w =8K K q g Globetemperature CEN14240:2004(E) 7 q r Referen
34、ceroomtemperature C q W1 Coolingwaterinlettemperature C q W2 Coolingwateroutlettemperature C q W Meancoolingwatertemperature q w =0,5(q w1 +q w2 ) C l Thermalconductivity Wm 1 K 1 4 Testmethod 4.1Principle Thecoolingcapacityofthetestobjectshallbedeterminedfrommeasurementsofthecoolingwaterflow rate,a
35、ndthecoolingwatertemperaturerise,understeadystateconditions.Thecoolingcapacityshallbe presentedasafunctionofthetemperaturedifferencebetweenthereferenceroomtemperatureandthe meancoolingwatertemperature. Themeasurementsshallbeperformedinanairtightroom,totherequirementsof4.2,withcontrolled temperatures
36、ontheinsidesurfacesandwithnegligibleheatflowthroughtheperimetersoftheroom.To balancethecoolingcapacityofthetestobject,heatingissuppliedinthetestroombymeansofanumber ofelectricheateddummiesplacedonthefloorwithinthetestroom.Inordertoobtainreproducible results,thedummiesshallbeplacedinpredeterminedposi
37、tionsasdescribedin4.4. 4.2 Testroom Thefloorareaofthetestroomshallbebetween10,0m 2 and21,0m 2 . Theratioofwidthtolengthofthetestroomshallbenotlessthan0,5andtheinsideheightshallbe between2,7mand3,0m. Therecommendedinsidedimensionsarealengthof4m,awidthof4mandaheightof3m. NOTE Thetestroomspecificatione
38、nablestheuseoftestroomsinaccordancewithEN442forthetestingof chilledsurfaces.Thedimensionsofthetestroomaregivenasarecommendation.Itispermittedforthetestroom dimensionstodeviatefromtherecommendeddimensions. Thetestroomshallbesufficientlytighttominimiseflowfromtheambientairoutsidewhichshallnot exceed0.
39、8ls 1 moftheperimetersurfaceatapressuredifferenceof50Pa(noteincludesfloorwallsand ceiling).Theairwithinthetestroomshallnotbeinfluencedbyanyforcedairflow. Theinnerwallandfloortemperaturecanbecontrolledbydifferentmethods,forinstance: a) waterpanelscoveringalltheoutsidesurfaceswithcirculatingtemperatur
40、econtrolledwater; b) forcedairflowcirculation,temperaturecontrolledwithelectricheaters,inanexternalroom. Thewalls,floorandceilingofthetestroomshallbeinsulatedinsuchaway,thatduringthetestthe averageheatflowthroughthesesurfacesislessthan0,40Wm .Thisheatflowshallbedeterminedby meansofpreliminarycalibra
41、tiontestsoftheroom,orbycalculation. Theradiationemissionrateoftheinnersurfacesoftheroomshallbeatleast0,9. Itisrecommendedthatfixedtemperaturesensorsshouldbeinstalledatleastinthecentreofeachroom surface. NOTE Itisassumedthattheinsulationisplacedinside,howeverifplacedoutside,thepositionofthe temperatu
42、resensorshouldbeintheoutersurfaceoftheinsulatinglayerandcoveredlocallywithrequiredinsulation toensureaccuratemeasurementofthesurfacetemperature.EN14240:2004(E) 8 4.3Instrumentation Theheatingofthetestroomisprovidedbymeansofanumberofelectricallyheateddummies(see Figure5)placedonthefloorinsidethetestr
43、oom. Thepowertoeachdummyshallnotexceed180Wandshallbecontinuouslyadjustable,forinstancewith avariablevoltagetransformerorwiththyristor. Thenumberofdummiesshallbeevenandchosensothateachdummycoversanaveragefloorareaof 0,9m 2 to1,35m 2 (i.e.themaximumheatloadis200Wm 2 ). Thecasingofthedummiesconsistsoflacqueredsteelsheet.Theemissionrateoftheinnerandouter surfaceshouldbeatleast0,9.Therealelectricpowertothedummiesshallbemeasuredwitha wattmeterofqualityclass1,0%orbetter
