1、BSI Standards PublicationBS EN 1751:2014Ventilation for buildings Air terminal devices Aerodynamic testing ofdamper and valvesBS EN 1751:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 1751:2014. Itsupersedes BS EN 1751:1999 which is withdrawn.The UK partic
2、ipation in its preparation was entrusted to TechnicalCommittee RHE/2, Ventilation for buildings, heating and hot waterservices.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of
3、a contract. Users are responsible for its correctapplication. The British Standards Institution 2014. Published by BSI StandardsLimited 2014ISBN 978 0 580 72607 1ICS 91.140.30Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the
4、 authority of theStandards Policy and Strategy Committee on 28 February 2014.Amendments issued since publicationDate Text affectedBS EN 1751:2014EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1751 January 2014 ICS 91.140.30 Supersedes EN 1751:1998English Version Ventilation for buildings - Air
5、 terminal devices - Aerodynamic testing of damper and valves Ventilation des btiments - Bouches dair - Essais arodynamiques des registres et clapets Lftung von Gebuden - Gerte des Luftverteilungssystems - Aerodynamische Prfungen von Drossel- und Absperrelementen This European Standard was approved b
6、y CEN on 9 November 2013. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national stan
7、dards may be obtained on application to the CEN-CENELEC 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 translation under the responsibility of a CEN member into its own language and n
8、otified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary,
9、 Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC
10、Management Centre: Avenue Marnix 17, B-1000 Brussels 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1751:2014 EBS EN 1751:2014EN 1751:2014 (E) 2 Contents Page Foreword 3 1 Scope 4 2 Normative references 4 3 Terms, definitions
11、, symbols and suffixes .5 3.1 Terms and definitions .5 3.2 Symbols 5 3.3 Suffixes .6 4 Instrumentation 6 4.1 Air flow rate measurement 6 4.2 Pressure measurement .7 4.3 Temperature measurement .7 5 Leakage tests .7 5.1 General 7 5.2 Damper and valve leakage 7 5.3 Casing leakage .8 6 Flow rate and pr
12、essure tests 8 6.1 Ducted method .8 6.2 Chamber method 10 6.2.1 General . 10 6.2.2 Size relationship . 10 6.2.3 Tests . 10 6.3 Test report . 10 Annex A (informative) Mechanical testing of dampers and valves . 17 A.1 Scope . 17 A.2 Instrumentation: Torque measurement 17 A.3 Pressure test to determine
13、 limiting value for structural stability 17 A.4 Torque tests to determine the torque required to operate the damper or valve and the limiting value to avoid structural damage 18 Annex B (informative) Thermal transmittance through dampers and valves 20 B.1 Introduction . 20 B.2 Scope . 20 B.3 Thermal
14、 loss test using a substitution method . 20 Annex C (normative) Classification of a damper or valve leakage . 23 C.1 Scope . 23 C.2 Leakage through closed blade(s) 23 C.3 Casing leakage 23 Annex D (informative) Effect of Duct Configuration on Pressure Loss Coefficient 26 D.1 General . 26 D.2 Applica
15、tion of correction factor 28 Bibliography . 29 BS EN 1751:2014EN 1751:2014 (E) 3 Foreword This document (EN 1751:2014) has been prepared by Technical Committee CEN/TC 156 “Ventilation for buildings”, the secretariat of which is held by BSI. This European Standard shall be given the status of a natio
16、nal standard, either by publication of an identical text or by endorsement, at the latest by July 2014, and conflicting national standards shall be withdrawn at the latest by July 2014. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent righ
17、ts. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 1751:1998. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard:
18、 Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
19、Sweden, Switzerland, Turkey and the United Kingdom. BS EN 1751:2014EN 1751:2014 (E) 4 1 Scope This European Standard specifies methods for the testing and rating of dampers and valves used in air distribution systems with pressure differences up to 2 000 Pa. The tests incorporated in this European S
20、tandard are: a) leakage past a closed damper or valve (for classification see Annex C); b) casing leakage (for classification see Annex C); c) flow rate/pressure requirement characteristics; d) torque: (see Annex A); e) thermal transmittance: (see Annex B). The acoustic testing of dampers and valves
21、 is not included in this European Standard. The tests specified above apply to the following: f) measurement of leakage past a closed damper or valve; g) measurement of casing leakage; h) determination of flow rate and pressure requirements; i) measurement of torque characteristics (see Annex A); j)
22、 measurement of thermal transfer characteristics to determine insulation properties (see Annex B). NOTE Certain aspects of the dynamic performance of dampers or valves are dependent upon the air distribution system to which they are connected and are, therefore, difficult to measure in isolation. Su
23、ch considerations have led to the omission of these aspects of the dynamic performance measurements from this European Standard. Also, in common with other air distribution components, the results from tests carried out in accordance with this European Standard may not be directly applicable if the
24、damper or valve is situated in an area of non-uniform flow. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the la
25、test edition of the referenced document (including any amendments) applies. EN 12792, 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 - P
26、art 1: General principles and requirements (ISO 5167-1) 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) EN ISO 5167-3, Measurement of fluid flow by means of pressure diff
27、erential devices inserted in circular cross-section conduits running full - Part 3: Nozzles and Venturi nozzles (ISO 5167-3) BS EN 1751:2014EN 1751:2014 (E) 5 EN ISO 5167-4, Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full -
28、 Part 4: Venturi tubes (ISO 5167-4) 3 Terms, definitions, symbols and suffixes 3.1 Terms and definitions For the purposes of this document, the terms and definitions given in EN 12792 apply. 3.2 Symbols The symbols used in this document are given in Table 1. Table 1 Symbols Symbol Quantity Unit A In
29、ternal cross-sectional area of duct m2CDCoefficient of discharge - DeEquivalent hydraulic diameter Circular ducts: A4Square/Rectangular ducts: baab+2m p Absolute pressure Pa pa Atmospheric pressure Pa pdVelocity pressure 1/2 v2Pa ptStagnation or absolute total pressure Pa psStatic gauge pressure (p
30、- pa) Pa psPressure difference across the damper or valve under test Pa p Flow meter differential pressure Pa ptConventional total pressure difference for an air density of 1,2 kgm3at the inlet to the damper or valve under test Pa qvVolume rate of air flow at the flow meter ls1qvLLeakage volume rate
31、 of air flow ls1qvLBAClosed blade air leakage factor, volume rate of air flow per unit duct cross sectional area ls1m2qvLCACase air leakage factor, volume rate of air flow per reference casing area (which is taken as perimeter of damper multiplied by an equivalent length of 1 m) ls1m2v Velocity ms1B
32、S EN 1751:2014EN 1751:2014 (E) 6 Symbol Quantity Unit s Position of damper setting %, or m T Torque Nm U Thermal transmittance coefficient WK1m2q Temperature C Air density kgm-3 Pressure loss coefficient - 3.3 Suffixes The following suffixes shall be used with the symbols given in Table 1. 1 is the
33、inlet of the damper or valve under test; 2 is the outlet of the damper or valve under test; u is the measuring point upstream of the flow meter; n is the value at a selected point of the flow rate/static pressure curve. 4 Instrumentation 4.1 Air flow rate measurement 4.1.1 The air flow rate shall be
34、 measured using instruments in accordance with EN ISO 5167-1, EN ISO 5167-2, EN ISO 5167-3 and EN ISO 5167-4, or other instruments which have equivalent calibrated performance. 4.1.2 Air flow meters shall have a minimum calibration accuracy of 2,5 % over the whole range. NOTE If necessary, flow mete
35、rs can be calibrated in situ by means of the Pitot static tube traverse technique described in ISO 3966. 4.1.3 Flow meters shall be checked at intervals as appropriate but not exceeding 12 months. This check can take the form of one of the following: a) a dimensional check for all flow meters not re
36、quiring calibration; b) a calibration over their full range using the original method employed for the initial calibration of meters calibrated in situ; c) a check against a flow meter which meets flow meter specifications according to EN ISO 5167-1, EN ISO 5167-2, EN ISO 5167-3 or EN ISO 5167-4 as
37、appropriate. 4.1.4 Leakage air flow meters shall have a minimum indicated accuracy according to the ranges in Table 2. Table 2 Accuracy of leakage air flow meters Range ls1Accuracy of measurement Up to and including 0,018 0,000 9 ls1More than 0,018 5 % BS EN 1751:2014EN 1751:2014 (E) 7 NOTE Alternat
38、ively, other devices such as variable area, flow-rate meters or integrating air flow meters of the positive displacement type can be used if calibrated in accordance with 4.1.3 c). 4.2 Pressure measurement 4.2.1 Pressure in the duct shall be measured by means of a liquid filled, calibrated manometer
39、 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 3. Table 3 Resolution for the ranges of manometers Range Pa Resolution Pa Up to and including 50 From 50 to 250 From 250 to 500
40、 Above 500 0,1 1 5,0 25,0 4.2.3 The measured value of differential pressure should be greater than 10 % of the range of the measurement device used. EXAMPLE With a micromanometer with a range from 0 to 1 000 Pa the minimum differential pressure to be measured is 100 Pa. 4.2.4 The uncertainty of cali
41、bration standards shall be: a) for instruments with a measuring range up to 100 Pa, equal or better than 0,5 Pa; b) for instruments with a measuring range over 100 Pa, equal or better than 0,5 % of reading. 4.3 Temperature measurement Measurement of temperature shall be, for example, by means of mer
42、cury-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. 5 Leakage tests 5.1 General Damper leakage performance could vary depending on whether the damper is subjected to positive or negat
43、ive pressure. The manufacturer shall specify the pressure conditions for test. 5.2 Damper and valve leakage 5.2.1 Measurement of damper and/or valve leakage in the shut-off position shall be made under conditions of actual operation with the damper or valve closing against the maximum recommended st
44、atic pressure conditions. Since small flow rates exist during the closed damper or valve condition, the method used to measure these small flow rates will introduce a high pressure loss when the damper or valve is open. This precludes a high pressure difference in the inlet duct until the damper or
45、valve approaches the closed position. BS EN 1751:2014EN 1751:2014 (E) 8 As the valve is closed and the flow rate decreases, the inlet static pressure difference will increase to approximately the recommended inlet pressure. 5.2.2 The damper or valve shall be cycled 10 times between the fully open an
46、d fully closed positions of the actuator at the start of each test (before starting the fan of the air supply system) concluding with the damper or valve in the fully closed position. NOTE In all cases in the closed position, the damper drive is subject to a torque rating recommended by the manufact
47、urer. 5.2.3 The damper or valve under test shall be connected to a test installation similar to that shown in Figure 1a) or Figure 1b). A suitable air supply shall be connected to the duct. In both cases, care shall be taken to ensure that duct joints are sealed to manufacturers instructions. 5.2.4
48、The supply air pressure shall be increased to the maximum recommended inlet pressure difference in accordance with the appropriate classification from Figure C.1 and Figure C.2. The damper or valve is then modulated to the open position, without any additional adjustment of the supply air system flo
49、w rate, and then returned to the closed position either manually or by the means provided by the manufacturer. The supply air pressure shall be adjusted, as the damper or valve nears closure, to maintain the recommended inlet static gauge pressure difference within 5 %. The above process is to ensure that the closed condition is as representative as possible of typical operation with airflow present. NOTE The air flow measuring device for leakage measurement may have to be disconnected in the above process to avoid
