1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58components/products for residential ventilation Part 5: Cowls and roof outlet terminal devicesThe E
2、uropean Standard EN 13141-5:2004 has the status of a British StandardICS 91.140.30Ventilation for buildings Performance testing of BRITISH STANDARDBS EN 13141-5:2004BS EN 13141-5:2004This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 Septembe
3、r 2005 BSI 30 September 2005ISBN 0 580 46680 9request to its secretary.Cross-referencesThe British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”
4、, 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 British Standard does not of itself confer i
5、mmunity from legal obligations.Summary of pagesThis document comprises a front cover, an inside front cover, the EN title page, pages 2 to 14, an inside back cover and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since
6、 publicationAmd. No. Date CommentsA list of organizations represented on this committee can be obtained on present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and Europ
7、ean developments and promulgate them in the UK.National forewordThis British Standard is the official English language version of EN 13141-5:2004.The UK participation in its preparation was entrusted to Technical Committee RHE/2, Ventilation for buildings, heating and hot water services, which has t
8、he responsibility to: aid enquirers to understand the text;EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 13141-5October 2004ICS 91.140.30English versionVentilation for buildings - Performance testing ofcomponents/products for residential ventilation - Part 5: Cowlsand roof outlet terminal device
9、sVentilation des btiments - Essais des performances descomposants/produits pour la ventilation des logements -Partie 5 : Extracteurs statiques et dispositifs de sortie entoitureLftung von Gebuden - Leistungsprfung vonBauteilen/Produkten fr die Lftung von Wohnungen - Teil5: Hauben und Dach-Fortluftdu
10、rchlsseThis European Standard was approved by CEN on 9 July 2004.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 re
11、ferences 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 in
12、to 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, L
13、uxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2004 CEN All rights of ex
14、ploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 13141-5:2004: EEN 13141-5:2004 (E) 2 Contents page Foreword3 Introduction .4 1 Scope 5 2 Normative references 5 3 Terms and definitions .5 4 Performance testing of aerodynamic characteristics6 4.1 Pressure
15、 drop.6 4.1.1 Test installation6 4.1.2 Test procedure.6 4.1.3 Analysis of results.8 4.2 Suction effect of a cowl.8 4.2.1 Test installation and conditions.8 4.2.2 Measurement conditions and uncertainties .9 4.2.3 Preliminary test10 4.2.4 Wind effect and flow rate tests.10 4.2.5 Test procedure.10 4.2.
16、6 Analysis of results.11 4.3 Presentation of results12 5 Additional testing for fan assisted cowls12 5.1 General12 5.2 Aerodynamic testing .12 5.3 Acoustic testing.12 5.4 Effective power input 12 5.4.1 Test Method12 5.4.2 Analysis of results.12 5.4.3 Presentation of results12 Annex A (normative) Der
17、ivation of values through the similitude law 13 Bibliography 14 EN 13141-5:2004 (E) 3 Foreword This document (EN 13141-5:2004) 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
18、 a national standard, either by publication of an identical text or by endorsement, at the latest by April 2005, and conflicting national standards shall be withdrawn at the latest by April 2005. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
19、 countries are bound to implement this European Standard: Austria, 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, Sw
20、itzerland and United Kingdom. 4 Introduction Figure 1 - Position of EN 13141-5 in the field of the mechanical building services Mechanical Building ServicesControl systemsVentilation and airconditioning systemsHeating systemsDuctwork Air terminaldevicesAir handlingunitsMechanical andnatural resident
21、ialventilationDesign criteriafor the indoorenvironmentSystemperformanceInstallationComponents/productsfor residential ventilation -Required and optionalperformancecharacteristicsPerformance testing ofcomponents/productsfor residential ventilationSimplifiedcalculation methodsfor residential ventilati
22、onsystemsDesign anddimensioningfor residential ventilationsystemsPerformance testingfor residential ventilationsystemsPart 1: Externally and internally mounted air transfer devicesPart 2: Exhaust and supply air terminal devicesPart 3: Range hoods for residential usePart 4: Fans used in residential v
23、entilation systemsPart 5: Cowls and roof outlet terminal devicesPart 6: Exhaust ventilation system packages used in a singledwellingEN 13141-5:2004 (E) 5 1 Scope This document specifies methods for measuring the aerodynamic and acoustic characteristics of cowls and roof outlets used in both natural
24、and mechanical ventilation. Only those cowls and roof outlets fitted onto ducts which project above the roof surface are covered by the present standard. Regarding the assisted cowls, only the fan assisted cowls are covered by the present standard, other types (such as injection assisted cowls) bein
25、g too recent to be adequately considered for the time being. The performance testing of the “assistance“ provided by the auxiliary fan of an assisted cowl is excluded for the scope of this standard. 2 Normative references The following referenced documents are indispensable for the application of th
26、is document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 1506:1997, Ventilation for buildings - Sheet metal air ducts and fittings with circular cross-section Dimensions. EN 12792:2
27、003, Ventilation for buildings - Symbols, terminology and graphical symbols. EN 13141-4:2004, Ventilation for buildings - Performance testing of components/products for residential ventilation - Part 4: Fans used in residential ventilation systems. ISO 5801, Industrial Fans - Performance testing usi
28、ng standardized airways. 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 12792:2003 and the following apply. 3.1 cowl air terminal device with or without moving component, intended to be fitted on top of an exhaust duct, with aim, by creating negative
29、 pressure depending of the wind speed, to avoid reverse flow and to increase the extracted flow rate in presence of wind 3.2 assisted cowl cowl fitted with an auxiliary device using other energy source than wind to compensate for lack of suction effect 3.3 fan assisted cowl assisted cowl where the a
30、uxiliary device is a fan 3.4 roof outlet air terminal device used for mechanical ventilation systems 3.5 pressure factor measure of the suction effect due to the wind. Ratio of the measured pressure difference to the dynamic pressure of the wind at a given vertical wind approach angle 3.6 test-volta
31、ge voltage to be used for supplying the motorised cowl during the testing EN 13141-5:2004 (E) 6 4 Performance testing of aerodynamic characteristics 4.1 Pressure drop 4.1.1 Test installation The pressure drop characteristics of the cowl or roof outlet shall be tested in a test installation such as i
32、s shown in Figure 2 but without the wind tunnel. The test installation shall comprise the following : an adjustable air supply incorporating an air flow rate measuring device with an uncertainty in accordance with 4.1.2 (e.g. orifice plate or venturi tube conforming with EN ISO 5167-1, or other flow
33、 meter such as a rotameter). The air supply passes via an airtight duct; means to stabilize the flow and pressure upstream the test duct, for example an airtight plenum chamber (side length at least 4 times the smallest diameter of the test duct) containing flow settling screens at the air entry zon
34、e and a smooth outlet; an airtight test circular duct to carry the cowl or roof outlet under test, of diameter D chosen according to EN 1506:1997, Table 1 to suit this cowl or roof outlet and of length : DL 6 = . 4.1.2 Test procedure When testing a fan assisted cowl, the auxiliary fan shall be switc
35、hed-off. The test shall be carried out by varying the air flow rate through the cowl or roof outlet to give static pressure differences between the test duct and the room in which the test is carried out, of 5 Pa, 10 Pa, 20 Pa and 50 Pa. The parameters to be measured are: air volume flow rate throug
36、h the cowl or roof outlet; total pressure difference between the test duct and the room in which the test is carried out. The pressure tapping in the test duct shall be 3D upstream of the cowl or roof outlet under test (D being the smallest diameter of the test duct). The total pressure in the duct
37、is calculated by measuring the static pressure and the averaged air velocity in the duct (the volume flow rate divided by the duct area) The uncertainty of the air flow measurement shall be lower than : 0,3 + 0,03 x (measured value), in dm3/s. The uncertainty of the pressure measurement shall be low
38、er than : 0,5 + 0,03 (measured value), in Pa. The environmental conditions existing during the tests such as temperature, air pressure shall be recorded. EN 13141-5:2004 (E) 7 Key 1 Wind tunnel 7 Sealed for preliminary suction test 12 Fan with flow rate adjusting device 2 Wind velocity 8 Flow settin
39、g screens 13 Air supply 3 Cowl 9 Plenum chamber 4 Pressure sensor in the wind 10 Flow measuring device 5 Test duct 11 Flow straightener 6 Static pressure measurement device Figure 2 - Typical example of a test installation EN 13141-5:2004 (E) 8 4.1.3 Analysis of results The measured result shall be
40、corrected if temperature and barometric pressure are different from the standard conditions (20 C and 101325 Pa), as follows: 101325) 273(293aameas vcor vp+=qqwhere: qv is the volume flow rate, in dm3/s qv coris the corrected volume flow rate, in dm3/s qv measis the measured volume flow rate, in dm3
41、/s pais the ambient pressure, in Paais the ambient temperature, in C 4.2 Suction effect of a cowl 4.2.1 Test installation and conditions The suction effect characteristics of the cowl shall be tested in a test installation such as shown in Figure 2 and described in 4.1.1. For the suction effect test
42、 the wind tunnel is required. Static pressure shall be measured with two pressure probes (and more) located in the working section far enough the cowl, at each side of the wind cross section. Reference pressure is the pneumatic average of the two static pressure ambiences. If the tests are carried o
43、ut in a confined working section as shown in Figure 2, then the cross-sectional area of the working section shall be at least twenty times the cross section area (in projection along the axis of the wind tunnel) of the cowl and duct in the wind. If the tests are carried out using an open jet type wi
44、nd tunnel, then the cross section area of the jet shall be at least ten times the cross-sectional area (in projection along the axis of the wind tunnel) of the cowl and duct in the wind. Because of the interactions between the duct wake and the aerodynamic behaviours of the cowl, the duct length blo
45、wn by the wind is more than 5 times its diameter. More over roughness shall be fitted on the duct surface in the wind. Squared ribs (e/D 0,01) is an example of solution. The turbulence intensity of the wind shall be less than 5 %. To simulate varying vertical wind approach angles, it shall be possib
46、le to rotate the cowl and test duct about an axis perpendicular to the wind tunnel axis and test duct axis, the cowl remaining near the same test point located at the wind tunnel axis to remain in the homogenous wind stream (see Figure 3). In addition, where the test duct axis is perpendicular to th
47、e wind tunnel axis, it shall be possible to rotate the cowl about the test duct axis to simulate varying horizontal wind approach angles (see Figure 4). When the mounting parts which supported the duct and the cowl are in the wind, they shall be far from the cowl and transparent from an aerodynamic
48、point of view. Make sure than the approach angles are maintained during the wind blowing. EN 13141-5:2004 (E) 9 The following parameters shall be measured: difference between total pressure in the test duct approaching the cowl and the static pressure in the wind tunnel; The total pressure in the du
49、ct is calculated with measured static pressure and the averaged air velocity in the duct. Static pressure difference shall be corrected as follows : testpoint4ss 4 6testpoint6 - where, - - ppppppppps =+=measured before the cowl set up. The dynamic pressure of the wind pdis calculated with the velocity measured at the point 2. Difference of velocity between the point 2 and the test point shall be included in the final calculation. d22ad U 21ppp += , where pdis the dynamic pressure difference between th
