EN 14277:2006

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Ventilation for buildings - Air terminal devices - Method for airflow measurement by calibrated sensors in or close to ATD/plenum boxesSystemes de ventilation pour les bâtiments - Bouches d'air - Méthode de mesure du débit d'air a l'aide de capteurs étalonnés dans ou a proximité des boîtes type bouche/plénumLüftung von Gebäuden - Luftdurchlässe - Verfahren zur Messung des Luftstroms durch kalibrierte Fühler in oder in der Nähe von Luftdurchlässen/ÜberdruckkammernTa slovenski standard je istoveten z:EN 14277:2006SIST EN 14277:2007en91.140.30VLVWHPLVentilation and air-conditioningICS:SLOVENSKI
STANDARDSIST EN 14277:200701-februar-2007

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 14277September 2006ICS 91.140.30 English VersionVentilation for buildings - Air terminal devices - Method forairflow measurement by calibrated sensors in or close toATD/plenum boxesSystèmes de ventilation pour les bâtiments - Bouches d'air- Méthode de mesure du débit d'air à l'aide de capteursétalonnés dans ou à proximité des boîtes typebouche/plénumLüftung von Gebäuden - Luftdurchlässe - Verfahren zurMessung des Luftstroms durch kalibrierte Fühler in oder inder Nähe von Luftdurchlässen/ÜberdruckkammernThis European Standard was approved by CEN on 7 July 2006.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 Central Secretariat 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 Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2006 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14277:2006: E

Zero-pressure difference method - Principle.26

1 Scope This European Standard specifies methods for the laboratory aerodynamic testing and rating of the air flow rate measurement accuracy of fixed air flow rate measurement devices, including supply and exhaust air terminal devices (ATD) and in-duct measurement stations (IMS) and the sensitivity of such devices to flow disturbance. A general overview of different test configurations is shown in Figure 1. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 12238, Ventilation for buildings — Air terminal devices — Aerodynamic testing and rating for mixed flow application EN 12792:2003, Ventilation for buildings — Symbols, terminology and graphical symbols EN ISO 5167-1, Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full — Part 1: General principles and requirements (ISO 5167-1:2003) EN ISO 5167-2, Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full — Part 2: Orifice plates (ISO 5167-2:2003) EN ISO 5167-3, Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full — Part 3: Nozzles and Venturi nozzles (ISO 5167-3:2003) EN ISO 5167-4, Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full — Part 4: Venturi tubes (ISO 5167-4:2003) ISO 5221, Air distribution and air diffusion — Rules to methods of measuring air flow rate in an air-handling duct

In duct measuring stations
Air terminal devices
IMS
ATD
ABC132404070506111312090810 Key A Undisturbed situation 1 Supply air
04 See Figure 4 09 See Figure 9 B 90 ° bend 2 Return air
05 See Figure 5 10 See Figure 10 C T - piece 3 Supply air
06 See Figure 6 11 See Figure 11
4 Return air
07 See Figure 7 12 See Figure 12
08 See Figure 8 13 See Figure 13 Figure 1 — Test configurations indicating test devices and test situations

3 Terms, definitions and symbols 3.1 Terms and definitions For the purposes of this document, the terms and definitions given in EN 12792:2003
and the following apply. 3.1.1 air terminal device [ATD] component of an installation which is designed for the purpose of achieving the predetermined movement of air into or from a treated space 3.1.2 in-duct measurement station [IMS] measurement device installed in the ductwork between two pieces of duct 3.1.3 characteristic length definitive dimension referring to the diameter of a circular duct or to the dimensions Lc1 or Lc2 of a rectangular duct (see Figures 2 and 3) 3.1.4 5 % calibration length [L5 ] distance from the device under test in a disturbed situation, within which the measurement error stays within 5 % compared to the calibration curve. This length [L5] depends on the type of the disturbance and is specified as a function of the characteristic length for all designated types of disturbances defined for each consecutive case 3.1.5 10% calibration length [L10 ] distance from the device under test in a disturbed situation, within which the measurement error stays within 10 % compared to the calibration curve. This length [L10] depends on the type of the disturbance and is specified as a function of the characteristic length for all designated types of disturbances defined for each consecutive case 3.1.6 zero-pressure difference method method to compensate for the effect of the air flow measurement apparatus when measuring air flow rate of induction air or supply/exhaust air NOTE The method is normally used when it is difficult to measure the air flow rate with sufficient accuracy by other methods due for example to low duct velocity. The method is described in Annex A.

Figure 2 — Rectangular duct disturbances with the characteristic length LC1 Lc2Lc2Lc2
Figure 3 — Rectangular duct disturbances with the characteristic length LC2

3.2 Symbols For the purposes of this document, the symbols and the suffixes given in Table 1 apply. Table 1 — Symbols Symbol Quantity Unit A Area m2 AD Cross sectional area of the ATD m2 APC Cross sectional area of the pressure chamber m2 De Equivalent diameter m E Relative error % k Coefficient - L Length m Lc1 Characteristic length of a rectangular duct m Lc2 Characteristic length of a rectangular duct m n Exponent - pa Atmospheric pressure Pa ps Static gauge pressure Pa ps1 Static pressure upstream of the device under test Pa ps2 Static pressure downstream of the device under test Pa psa Absolute static pressure Pa ∆p Pressure difference Pa ∆pM Measurement pressure difference Pa ∆ps Static pressure drop over the device under test Pa qv Measured air flow rate l·s-1 vx Air velocity in main duct upstream of T-piece m·s-1 vy Air velocity in side branch of T-piece m·s-1 vz Air velocity in main duct downstream of T-piece m·s-1 β Output signal - ρM Air density during measurement kg·m-3 4 Instrumentation 4.1 Air flow rate measurement 4.1.1 The air flow rate shall be measured using instruments in accordance with EN ISO 5167
parts 1 to 4, ISO 5221 or other instruments which will have equivalent calibrated performance.

EN ISO 5167 parts 1 to 4 as appropriate. 4.2 Pressure measurement 4.2.1 Pressure in the duct shall be measured by means of a liquid filled, calibrated manometer or any other device conforming to 4.2.2 4.2.2 The resolution shall not be greater than the characteristics listed for the accompanying range of manometers, given in Table 2. Table 2 — Resolution for the ranges of manometers Range Resolution Pa Pa Up to and including 50 0,1 From 50 to 250 1 From 250 to 500 5,0 Above 500 25,0
4.2.3 The measured value of differential pressure should be greater than 10 % of the range of the measurement device used. NOTE Example: with a micromanometer in the range 0…1 000 Pa the minimum differential pressure to be measured is 100 Pa. 4.2.4 The uncertainty of calibration standards shall be: a) for instruments with the range up to 100 Pa, equal or better than ± 0,5 Pa; b) for instruments with the range over 100 Pa, equal or better than ± 0,5 % of reading. 4.3 Temperature measurement 4.3.1 Measurement of temperature shall be, for example, by means of mercury-in-glass thermometers, resistance thermometers or thermo-couples. Instruments shall have a resolution better than 0,5 K and be calibrated to an accuracy of ± 0,25 K.
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