1、BRITISH STANDARD Ventilation for buildings - Air terminal devices - Aerodynamic testing and rating for displacement flow applications The European Standard EN 12239:2001 has the status of a British Standard ICs 91.140.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMlTED BY COPYRIGHT LAW BS EN 122
2、39:2001 BS EN 12239:2001 Amd. No. Date National foreword Comments This British Standard is the official English language version of EN 12239:ZOOl. The UK participation in its preparation was entrusted to Technical Committee RHE/2, Air distribution and air diffusion, which has the responsibility to:
3、- - 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 informed monitor related international and European developments and promulgate them in the UK. - A list of organizations re
4、presented 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 Correspo
5、ndence 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 o
6、f itself confer immunity from legal obligations. This British Standard, having been prepared under the direction of the Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 16 October 2001 C? BSI 16 October 2001 Summary
7、 of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 18, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. ISBN O 580 38233 8 EUROPEAN STANDARD NORME EUROPENNE EUROPIS
8、CHE NORM EN 12239 August 2001 ICs 91.140.30 English version Ventilation for buildings - Air terminal devices - Aerodynamic testing and rating for displacement flow applications Ventilation des btiments -Bouches dair - Essais arodynamiques et caractrisation pour applications dplacement dair LOftung v
9、on Gebuden - Luftdurch1-e - Aerodynamische PrOfung und Bewertung fur Anwendung bei Verdrngungsstrmung This European Standard was approved by CEN on 22 June 2001 GEN members are bound to comply with the CENICENELEC Internal Regulations which stipulate the conditions for giving thic European Standard
10、the status of a national standard without any alteration. Up-to-date lists and biblicgraphical references concerning such national standards 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
11、). A version in any other language made by translation under the responsibility of a CEN member into its own language and nottied to the Management Centre has the same status as the ofiicial versions. GEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland
12、, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden. Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stascart, 36 B-I050 Brussels O
13、2001 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12239:2001 E EN 12239:2001 (E) Contents Page Foreword . 3 1 2 3 3.1 3.2 4 5 5.1 5.2 5.3 5.3.1 5.3.2 5.3.3 5.4 5.5 5.6 5.6.1 5.6.2 5.6.3 5.7 5.7.1 5.7.2 5.7.3 6 Scope . 4 Terms, d
14、efinitions and symbols 4 Normative references . 4 Terms and definitions 4 Symbols 6 Types of air terminal devices . 8 Method of test 8 Principle 8 Test Set-up 9 Installation . 10 General . IO Test installation D 10 Test installation P 10 Velocity instruments 10 Test room 11 Procedure 11 General . 11
15、 Measuring with tracer gas . 12 Measuring with the zero pressure-difference method . 13 Expression of results . 15 Pressure measurement for a given flow rate 15 Velocity measurement 15 Induction rate measurement . 18 Uncertainty 18 2 - EN 12239:2001 (E) Foreword This European Standard has been prepa
16、red 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 February 2002, and conflicting national s
17、tandards shall be withdrawn at the latest by February 2002. According to the CENICENELEC 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, I
18、celand, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. 3 EN 12239:ZOOl (E) 1 Scope This European Standard specifies methods for the laboratory aerodynamic testing and rating of low velocity air terminal devices for displacement flow appl
19、ications, including the specification of suitable test facilities 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
20、. 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 r
21、evisions 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 (including amendments). EN 12238, Ventilation for buildings - Air terminal devices - Aerodynam
22、ic testing and rating for mixed #ow applications. prEN 131 82: 1998, Ventilation for buildings - Instrumentation requirements for air velocity measurements in ventilated spaces. EN IS0 5167-1, Measurement of fluid flow by means of pressure differential devices Part 1: Orifice plates, nozzles and Ven
23、turi tubes inserted in circular cross-section conduits running full (IS0 5167- 1:1991). CR 12792, Ventilafion for buildings - Symbols and terminology. IS0 5221, Air distribution and air diffusion - Rules to methods of measuring airfiow rate in an air handling duct. 3 Terms, definitions and symbols 3
24、.1 Terms and definitions For the purposes of this European Standard, the terms and definitions given in CR 12792, together with the following, apply. 3.1 .I low velocity air terminal device air terminal device which is designed for thermally controlled ventilation e.g. displacement flow applications
25、 3.1.2 primary airflow rate qp volume of air entering the air terminal device in unit time from an upstream duct 3.1.3 internally induced airflow rate q1 volume of air in unit time induced into the primary airflow inside the air terminal device 3.1.4 total airflow rate q, volume of air in unit time,
26、 discharged into the room from the air terminal device 4 EN 12239:2001 (E) 3.1.5 primary air temperature 6, air temperature of the primary airflow 3.1.6 induced air temperature 0, air temperature of the internally induced airflow 3.1.7 total air temperature QI air temperature of the total airflow fr
27、om the air terminal device 3.1.8 reference air temperature of the room 6, average of at least five measurements of the air temperature at a height of 1,l m from the floor and outside the area directly influenced from the device 3.1.9 primary air temperature difference AOp algebraic difference of the
28、 primary air temperature and the reference air temperature of the occupied zone 3.1 .I O isovel loci of points of equal mean velocity 3.1.1 1 length of the specified isovel u“ maximum horizontal distance from the air terminal device (or wall) to the rectangle circumscribing the specified isovel, ind
29、ependent of the distance from the floor as shown in Figure 4 3.1.12 width of the specified isovel v maximum width of the rectangle circumscribing the specified isovel perpendicular to a, independent of the distance from the floor as shown in Figure 4 3.1 .I 3 height of the specified isovel h, maximu
30、m height above floor of the specified isovel as shown in Figure 5 3.1.14 induction rate i the ratio of the internally induced airflow rate and primary airflow rate i = qi /qp 3.1 .I 5 static pressurep, static pressure relative to the atmosphere 3.1 .I 6 dynamic pressure Pd dynamic pressure correspon
31、ding to the mean velocity in the connecting duct. For plenum connection without duct, the dynamic pressure is equal to zero 3.1 .I 7 total pressurepl sum of the static and dynamic pressures 3.1.18 equivalent diameter D, equivalent diameter of the nominal size of the duct 5 EN 12239:ZOOl (E) 3.2 Symb
32、ols The nomenclature shown in Table 1 is used throughout this European Standard. Table 1 - Symbols used in the testing of air terminal devices Symbol Quantity Area Area corresponding to the crocs section of the nominal size of the duct to which the device is fitted (neck area) Length of isovel Width
33、 of test room or installation Width of isovel Concentration measured in the internally induced airflow Concentration measured in the primary airflow Concentration measured in the total airflow of the air termin - Type 2 (categories a and ): floor mounted devices with vertical discharge of air; - Typ
34、e 3 (categories a and ): ceiling mounted devices. NOTE Category a is applicable to devices without internal induction. Category is applicable to devices with internal induction. Two different test installations can be identified: - test installation D: the air terminal device is connected to a duct;
35、 - test installation P: the air terminal device is connected to the plenum without duct. 5 Method of test 5.1 Principle The test consists of the determination of the pressure loss, isovel and, for category devices, the induction rate of the air terminal device. The air velocity shall be measured at
36、different distances and heights from the air terminal device under non-isothermal conditions. The air velocity shall be measured at sufficient points and locations to determine the specified isovel, according to the uncertainty given in clause 6. For air terminal devices mainly designed for comfort
37、ventilation, the isovel for Y = 0,20 m.s- shall be determined. For air terminal devices mainly designed for industrial purposes, the isovel for Y = 0,30 m.s“ shall be determined. 8 5.2 Test set-up The test Set-up is shown in Figures 1 and 2. Flow Type la Heating elements Figure 1 - Test set-up for T
38、ype 1 devices Test installation D Test installation P Aps Figure 2 - Test Set-up for Type 2 devices 9 EN 12239:2001 (E) 5.3 Installation 5.3.1 General The air terminal device shall be installed in accordance with the manufacturers recommendation. The primary air temperature shall be measured at a po
39、sition 30, upstream of the air terminal device. The temperature shall not vary by more than +0,5 K, and the airflow rate shall not vary by more than +2 % during the test. 5.3.2 Test installation D The connection between the duct and the air terminal device shall be equal to the nominal size of the d
40、evice. The connecting duct shall be straight and at least 200, long to ensure uniform velocity profile or shall include an efficient flow straightener located at a position at least 30, from any part of the air terminal device. The straightener cells should have an axial length at least equal to six
41、 times the hydraulic diameter of their cross-section. The plane of static pressure measurement shall be at 130, upstream of the air terminal device. A static pressure traverse shall be taken on two orthogonal diameters in order to obtain the maximum and minimum values. The measured pressures shall n
42、ot differ by more than t10 % from the pressure at the selected point of test in the plane of measurement. As an alternative method, a piezometer ring may be used. 5.3.3 Test installation P The air velocity in the plenum shall not exceed 1 ms- at a distance of 20, from the centre of the air terminal
43、device inlet. The static pressure shall be measured in the plenum where the air velocity is less than 1 m.S The primary air temperature shall be measured in the plenum at a maximum distance of 20, from the centre of the air teminal device inlet. 5.4 Velocity instruments The measurement of low veloci
44、ties shall be made with instruments in accordance to prEN 13182:1998. 10 EN 12239:2001 (E) 5.5 Testroom The test shall be conducted in an enclosed room having all surfaces orthogonal at the comers and any surfaces over which the supply airflows shall be smooth and flat. Typical dimensions of the tes
45、t room are 7,5 m in length, 5,6 m in width and 2,8 m in height. Larger or smaller test rooms shall have a width to height ratio between 1,5 and 2,2. The minimum dimensions of the test room shall be: Length 5,O m Width 4.2 m Height 2,8 m Air shall be exhausted from the test room at a position of at l
46、east 2,5 m from the floor. The reference air temperature of the room is the average of at least five measurements at a height of 1,l m from the floor and outside the area directly influenced from the device. The air temperature at these measuring points shall not differ by more than t0,5 K from the
47、mean value at any place. The primary temperature difference shall be constant within +O3 K during the test. Heating elements shall be distributed uniformly over the floor area and covered by the floor. The surface temperature of the floor shall not exceed the reference air temperature by more than 4
48、 K. 5.6 Procedure 5.6.1 General Do not commence testing until steady state conditions have been achieved. Express the performance for category “a devices for at least a primary air temperature difference ABp of 3 K (cooling). NOTE Air terminal devices of category “” may also have their performance p
49、resented for a primary air temperature difference A b) flow pattern along walls down to floor level. In both cases, determine the isovel along the floor as described above. For the free flow pattern case, cany out an additional test to determine the isovel, or the level of the highest velocity between the air terminal device and the floor. For calculating the induction rate of category devices (in accordance with 5.7.3), measure the temperatures 8, and Bi according to the following: - the induced air temperature is the average of at least three measu
