BS EN 1751-1999 建筑物通风.出气口设备.减振器和阀的空气动力学试验.pdf

| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 17511999 The European Standard EN 17511998 has the status of a British Standard ICS 23.120 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Ventilation for buildings Air terminal devices Aerodynamic testing of dampers and valves Licensed Copy Institute Of Technology Tallaght, Institute of Technology, Sat Sep 09 040837 BST 2006, Uncontrolled Copy, c BSI This British Standard, having been prepared under the direction of the Engineering Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 June 1999  BSI 06-1999 ISBN 0 580 30724 7 BS EN 17511999 Amendments issued since publication Amd. No.DateComments National foreword This British Standard is the English language version of EN 17511998. It supersedes BS 68211988 which will be withdrawn on 15 May 1999. The UK participation in its preparation was entrusted to Technical Committee RHE/2, Air distribution and air diffusion, which has the responsibility to aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests ined; monitor related international and European developments and promulgate them in the UK. 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 Standards Catalogue under the section entitled International Standards Correspondence Index, or by using the Find facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 16, an inside back cover and a back cover. Licensed Copy Institute Of Technology Tallaght, Institute of Technology, Sat Sep 09 040837 BST 2006, Uncontrolled Copy, c BSI CEN European Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central Secretariat rue de Stassart 36, B-1050 Brussels  1998 CEN All rights of exploitation in any and by any means reserved worldwide for CEN national members Ref. No. EN 17511998 E EUROPEAN STANDARDEN1751 NORME EUROPE ENNE EUROPA ISCHE NORM October 1998 ICS 91.140.30 Descriptors buildings, ventilation, air distribution, air diffusion, air terminal devices, dampers, flow measurements, pressure measurements, measuring instruments, accuracy, air perance tests, leak tests, pressure tests English version Ventilation for buildings Air terminal devices Aerodynamic testing of dampers and valves Ventilation des ba timents Bouches dair Essais ae rodynamiques des registres et clapets Lu ftung von Geba uden Gera te des Luftverteilungssystems Aerodynamische Pru fungen von Drossel- und Absperrelementen This European Standard was approved by CEN on 2 October 1998. 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 standards 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 translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. 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. Licensed Copy Institute Of Technology Tallaght, Institute of Technology, Sat Sep 09 040837 BST 2006, Uncontrolled Copy, c BSI Page 2 EN 17511998  BSI 06-1999 Foreword This European Standard 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 national standard, either by publication of an identical text or by endorsement, at the latest by April 1999, and conflicting national standards shall be withdrawn at the latest by April 1999. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword2 1Scope3 2Normative references3 3Definitions and symbols3 4Instrumentation4 5Leakage tests4 6Flow rate and pressure tests5 Annex A normative Mechanical testing of dampers and valves11 Annex B inative Thermal transmittance through dampers and valves13 Annex C normative Classification of a damper or valve leakage14 Licensed Copy Institute Of Technology Tallaght, Institute of Technology, Sat Sep 09 040837 BST 2006, Uncontrolled Copy, c BSI Page 3 EN 17511998  BSI 06-1999 1 Scope This European Standard specifies s 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 Standard 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 is not included in this standard. The tests specified above apply to the following a measurement of leakage past a closed damper or valve; b measurement of casing leakage; c determination of flow rate and pressure requirements; d measurement of torque characteristics see annex A; e measurement of thermal transfer characteristics to determine insulation properties see annex B. NOTECertain aspects of the dynamic perance of dampers or valves are dependent upon the air distribution system to which they are connected and are, therefore, difficult to measure in isolation. Such considerations have led to the omission of these aspects of the dynamic perance 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 damper or valve is situated in an area of non-uni flow. 2 Normative references This 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 listed hereafter. For dated references the subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. CR 12792, Ventilation for buildings Symbols and terminology. ISO 5221, Air distribution and air diffusion Rules to s of measuring air flow rate in an air handling duct. ISO 7244, Air distribution and air diffusion Aerodynamic testing of dampers and valves. 3 Definitions and symbols For the purposes of this standard, the definitions given in CR 12792 apply. 3.1 Symbols The symbols used in this standard are given in Table 1. Table 1 Symbols SymbolQuantityUnit AInternal cross-sectional area of duct m2 CDCoefficient of discharge DeEquivalent diameter Circular ducts √ 4A π Square/rectangular ducts 2ab a b m pAbsolute pressurePa paAtmospheric pressurePa pdVelocity pressure r v2Pa ptStagnation or absolute total pressure Pa psStatic gauge pressure p 2 paPa DpFlow meter pressure differencePa DptConventional total pressure differential for an air density of 1,2 kgm23at the inlet to the damper or valve under test Pa qvVolume rate or air flow at the flow meter ls21m22 qvLLeakage volume rate of air flow ls21m22 qvLBAClosed blade leakage volume rate of air flow per unit duct cross-sectional area ls21m22 qvLCACase leakage volume rate of air flow per unit duct cross-sectional area ls21m22 vVelocityms21 sPosition of damper setting, a or m TTorqueNm UThermal transmittance coefficient WK21m22 qTemperature8C rAir densitykgm23 jLoss coefficient2 3.2 Suffixes The following suffixes shall be used with the symbols given in Table 1. 1 is the 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 Licensed Copy Institute Of Technology Tallaght, Institute of Technology, Sat Sep 09 040837 BST 2006, Uncontrolled Copy, c BSI Page 4 EN 17511998  BSI 06-1999 4 Instrumentation 4.1 Air flow rate measurement 4.1.1 The air flow rate shall be measured using instruments in accordance with ISO 5221. 4.1.2 Air flow meters shall have a minimum accuracy according to the ranges in Table 2. Table 2 Ranges and accuracies of air flow meters Range ls21m22Accuracy of measurement From 0,07 to 7 2,5 From 0,007 to 0,07 5 NOTEFlow meters can be calibrated in situ by means of the Pitot static tube traverse techniques described in ISO 5221. 4.1.3 Leakage air flow meters shall have a minimum indicated accuracy according to the ranges in Table 3. Table 3 Accuracy of leakage air flow meters Range ls21m22Accuracy of measurement Up to and including 0,018 0,0009 ls21m22 More than 0,018 5 NOTEAlternatively, 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 4.1.4c. 4.1.4 Flow meters shall be checked at intervals as appropriate but not exceeding 12 months. This check can take the of one of the following a a dimensional check for all flow meters not requiring calibration; b a check calibration over their full range using the original employed for the initial calibration or for flow meters calibrated in situ; c a check against a flow meter which meets flow meter specifications according to ISO 5221. 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 coning to 4.2.2. 4.2.2 The maximum scale interval shall not be greater than the characteristics listed for the accompanying range of manometer given in Table 4. Table 4 Maximum scale interval according to range of the manometer RangeMaximum scale interval PaPa Up to and including 251,0 From 25 to 2502,5 From 250 to 5005,0 Above 50025,0 4.2.3 For air flow rate measurements, the minimum pressure differentials shall be a 25 Pa with an inclined tube manometer or micro-manometer; b 500 Pa with a vertical tube manometer. 4.2.4 Calibration standards shall be a For instruments within the range 25 Pa, a micro-manometer accurate to0,5 Pa; NOTEIn practice, difficulty can be experienced in verifying these accuracies. b For instruments within the range 25 Pa 500 Pa, a manometer accurate to2,5 Pa hook gauge or micro-manometer; c For instruments within the range 500 Pa, a manometer accurate to25 Pa vertical manometer. 4.3 Temperature measurement Measurement of temperature is carried out, for example by means of mercury-in-glass thermometers, resistance thermometers or thermo-couples. Instruments shall be graduated, or give readings in intervals not greater than 0,5 K, and calibrated to an accuracy of 0,25 K. 5 Leakage tests 5.1 General Damper leakage perance could vary depending on whether the damper is subjected to positive or negative 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 static pressure conditions. Since small flow rates exist during the closed damper or valve condition, the 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 valve approaches the closed position. 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 and 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. NOTEIn all cases in the closed position, the damper drive is subject to a torque rating recommended by the manufacturer. 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. Licensed Copy Institute Of Technology Tallaght, Institute of Technology, Sat Sep 09 040837 BST 2006, Uncontrolled Copy, c BSI Page 5 EN 17511998  BSI 06-1999 5.2.4 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 flow 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 within5 . 5.2.5 Report the damper or valve leakage volume rate of air flow as a function of test pressure difference in the closed position. Also include classification, see annex C. 5.3 Casing leakage 5.3.1 The test installation shall be similar to that shown in Figure 2a or Figure 2b. The damper or valve casing outlet