SIST EN 12239:2001

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Lüftung von Gebäuden - Luftdurchlässe - Aerodynamische Prüfung und Bewertung für Anwendung bei VerdrängungsströmungVentilation des bâtiments - Bouches d'air - Essais aérodynamiques et caractérisation pour applications déplacement d'airVentilation for buildings - Air terminal devices - Aerodynamic testing and rating for displacement flow applications91.140.30VLVWHPLVentilation and air-conditioningICS:Ta slovenski standard je istoveten z:EN 12239:2001SIST EN 12239:2001en01-december-2001SIST EN 12239:2001SLOVENSKI
STANDARD



SIST EN 12239:2001



EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12239August 2001ICS 91.140.30English versionVentilation for buildings - Air terminal devices - Aerodynamictesting and rating for displacement flow applicationsVentilation des bâtiments - Bouches d'air - Essaisaérodynamiques et caractérisation pour applicationsdéplacement d'airLüftung von Gebäuden - Luftdurchlässe - AerodynamischePrüfung und Bewertung für Anwendung beiVerdrängungsströmungThis European Standard was approved by CEN on 22 June 2001.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2001 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12239:2001 ESIST EN 12239:2001



EN 12239:2001 (E)2ContentsPageForeword.31Scope.42Normative references.43Terms, definitions and symbols.43.1Terms and definitions.43.2Symbols.74Types of air terminal devices.95Method of test.95.1Principle.95.2Test set-up.105.3Installation.115.3.1General.115.3.2Test installation D.115.3.3Test installation P.115.4Velocity instruments.115.5Test room.115.6Procedure.125.6.1General.125.6.2Measuring with tracer gas.135.6.3Measuring with the zero pressure-difference method.135.7Expression of results.155.7.1Pressure measurement for a given flow rate.155.7.2Velocity measurement.155.7.3Induction rate measurement.186Uncertainty.18SIST EN 12239:2001



EN 12239:2001 (E)3ForewordThis European Standard has been prepared by Technical Committee CEN/TC 156 "Ventilation forbuildings", the secretariat of which is held by BSI.This European Standard shall be given the status of a national standard, either by publication of anidentical text or by endorsement, at the latest by February 2002, and conflicting national standardsshall be withdrawn at the latest by February 2002.According to the CEN/CENELEC Internal Regulations, the national standards organizations of thefollowing countries are bound to implement this European Standard: Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg,Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.SIST EN 12239:2001



EN 12239:2001 (E)41 ScopeThis European Standard specifies methods for the laboratory aerodynamic testing and rating of lowvelocity air terminal devices for displacement flow applications, including the specification of suitable testfacilities and measurement techniques.The standard gives only tests for the assessment of characteristics of the air terminal devices under non-isothermal conditions.This standard applies to Class IV air terminal devices as defined in EN 12238.2 Normative referencesThis European Standard incorporates by dated or undated reference, provisions from other publications.These normative references are cited at the appropriate places in the text and the publications are listedhereafter. For dated references the subsequent amendments to or revisions of any of these publicationsapply to this European Standard only when incorporated in it by amendment or revision. For undatedreferences the latest edition of the publication referred to applies (including amendments).EN 12238, Ventilation for buildings — Air terminal devices — Aerodynamic testing and rating formixed flow applicationsprEN 13182:1998, Ventilation for buildings — Instrumentation requirements for air velocitymeasurements in ventilated spacesEN ISO 5167-1 Measurement of fluid flow by means of pressure differential devices Part 1: Orifice plates,nozzles and Venturi tubes inserted in circular cross-section conduits running full (ISO5167-1:1991)CR 12792, Ventilation for buildings — Symbols and terminologyISO 5221, Air distribution and air diffusion - Rules to methods of measuring air flow rate in an airhandling duct3 Terms, definitions and symbols3.1 Terms and definitionsFor the purposes of this European Standard, the terms and definitions given in CR 12792, together withthe following, apply.3.1.1low velocity air terminal devicean air terminal device which is designed for thermally controlled ventilation e.g. displacement flowapplications3.1.2primary air flow rate qpvolume of air entering the air terminal device in unit time from an upstream ductSIST EN 12239:2001



EN 12239:2001 (E)53.1.3internally induced air flow rate qivolume of air in unit time induced into the primary air flow inside the air terminal device3.1.4total air flow rate qtvolume of air in unit time, discharged into the room from the air terminal device3.1.5primary air temperature pair temperature of the primary air flow3.1.6induced air temperature iair temperature of the internally induced air flow3.1.7total air temperature tair temperature of the total air flow from the air terminal device3.1.8reference air temperature of the room
rthe average of at least five measurements of the air temperature at a height of 1,1 m from the floor andoutside the area directly influenced from the device3.1.9primary air temperature difference pthe algebraic difference of the primary air temperature and the reference air temperature of the occupiedzone3.1.10isovelthe loci of points of equal mean velocity3.1.11length of the specified isovel avthe maximum horizontal distance from the air terminal device (or wall) to the rectangle circumscribing thespecified isovel , independent of the distance from the floor as shown in Figure 43.1.12width of the specified isovel bvthe maximum width of the rectangle circumscribing the specified isovel perpendicular to av, independentof the distance from the floor as shown in Figure 43.1.13height of the specified isovel hvthe maximum height above floor of the specified isovel as shown in Figure 53.1.14induction rate ithe ratio of the internally induced air flow rate and primary air flow rate
i = qi / qpSIST EN 12239:2001



EN 12239:2001 (E)63.1.15static pressure psstatic pressure relative to the atmosphere3.1.16dynamic pressure pdthe dynamic pressure corresponding to the mean velocity in the connecting duct. For plenum connectionwithout duct, the dynamic pressure is equal to zero3.1.17total pressure ptthe sum of the static and dynamic pressures3.1.18equivalent diameter Dethe equivalent diameter of the nominal size of the ductSIST EN 12239:2001



EN 12239:2001 (E)73.2 SymbolsThe nomenclature shown in Table 1 is used throughout this European Standard.Table 1 — Symbols used in the testing of air terminal devicesSymbolQuantitySI unitAAream2AdArea corresponding to the cross section of the nominal size of the duct towhich the device is fitted (neck area)m2avLength of isovelmbRWidth of test room or installationmbvWidth of isovelmCiConcentration measured in the internally induced air flow-CpConcentration measured in the primary air flow-CtConcentration measured in the total air flow of theair terminal device-DeEquivalent diameter
A d2mDhHydraulic diameter
perimeter4AdmdDiametermhvHeight of isovelmhRHeight of test room or installationmiInduction rate-lRLength of test room or installationmpsaAbsolute static pressurePapaAtmospheric pressurePapsStatic pressure or static gauge pressure (psa - pa)PaptaStagnation (or absolute total) pressurePaSIST EN 12239:2001



EN 12239:2001 (E)8Table 1 — Symbols used in the testing of air terminal devices (concluded)SymbolQuantitySI unitptTotal pressure (pta - pa)Papt1,2Total pressure corresponding to a density of 1,2 kgm-3PaptDTotal pressure requirement of the
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