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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 1886:1998 The Europ
2、ean Standard EN 1886:1998 has the status of a British Standard ICS 91.140.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Ventilation for buildings Air handling units Mechanical performance Licensed Copy: sheffieldun sheffieldun, na, Mon Oct 30 10:13:10 GMT+00:00 2006, Unco
3、ntrolled Copy, (c) BSI This British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 November 1998 BSI 1998 ISBN 0 580 29822 1 BS EN 1886:1998 Amendments issued since publication A
4、md. No.DateText affected National foreword This British Standard is the English language version of EN 1886:1998. 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 t
5、ext; 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 represented on this committee can be obt
6、ained 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 faci
7、lity 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 obliga
8、tions. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 13 and a back cover. Licensed Copy: sheffieldun sheffieldun, na, Mon Oct 30 10:13:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI CEN European Committee for Standardization Comite Europe
9、 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 form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1886:1998 E EUROPEAN STANDARDEN 1886 NORME EUROPE ENNE EUROPA ISC
10、HE NORM May 1998 ICS 91.140.30 Descriptors: Buildings, ventilation, air conditioning, air filters, air handling units, classifications, mechanical strength, thermal transmittance, acoustic insulation, fire protection, safety, tests English version Ventilation for buildings Air handling units Mechani
11、cal performance Ventilation des ba timents Caissons de traitement dair Performance me canique Lu ftung von Geba uden Zentrale raumlufftechnische Gera te Mechanische Eigenschaften und Meverfahren This European Standard was approved by CEN on 26 March 1998. CEN members are bound to comply with the CEN
12、/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
13、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.
14、 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: sheffieldun sheffieldun, na, Mon Oct 30 10:
15、13:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 2 EN 1886:1998 BSI 1998 Figure 1 Air handling units Mechanical performance: position in the field of mechanical building services Foreword This European Standard has been prepared by Technical Committee CEN/TC 156, Ventilation for buildings, of w
16、hich the secretariat is held by BSI. The standard is a part of a series of standards for air handling units used for ventilation and air conditioning of buildings for human occupancy. It considers the mechanical performance of an air handling unit as a whole and will be supported by a standard for s
17、ections and components. The position of this standard in the whole field of standards for mechanical building services is illustrated in Figure 1. No existing European Standard is superseded. This European Standard shall be given the status of a national standard, either by publication of an identic
18、al text or by endorsement, at the latest by November 1998, and conflicting national standards shall be withdrawn at the latest by November 1998. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Sta
19、ndard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Mon Oct 30 10:13:10 GMT+00:00 2006, Uncontrolled Copy
20、, (c) BSI Page 3 EN 1886:1998 BSI 1998 Contents Page Foreword2 Introduction4 1Scope4 2Normative references4 3Definitions4 4Mechanical strength of casing5 4.1 Requirements and classification5 4.2 Testing5 5Casing air leakage6 5.1 Requirements and classification6 5.2 Testing7 5.3 Test procedure7 5.4 D
21、etermination of allowable leakage rates7 6Filter bypass leakage7 6.1 Requirements7 6.2 Testing8 7Thermal performance of casing10 7.1 General10 7.2 Requirements and classification10 7.3 Testing11 8Acoustic insulation of casing11 8.1 General11 8.2 Test requirements11 8.3 Test method11 8.4 Test procedu
22、re12 8.5 Evaluation of the sound insertion loss De12 9Fire protection12 9.1 General12 9.2 Classification12 9.3 Requirements12 10Mechanical safety13 Licensed Copy: sheffieldun sheffieldun, na, Mon Oct 30 10:13:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 4 EN 1886:1998 BSI 1998 Introduction Thi
23、s standard specifies the mechanical performance of an air handling unit as a whole, to be utilized by all involved in ventilation and air conditioning manufacturing, design, installation and maintenance. The functions and characteristics of the individual sections of the unit will be considered in a
24、nother of the series of standards covering air handling units. Because of the different requirements, due to climatic conditions, to building traditions in the different parts of Europe, and to the specific features of individual applications, most of the requirements are given in the form of classe
25、s, which may be specified generally to be used in certain regions, or separately for individual applications. Only parts of the standard have been adopted from existing national or international standards. Comparison tests for strength, air leakage and thermal performance have been made in Finland,
26、Germany, Netherlands, Switzerland and the United Kingdom. 1 Scope This standard specifies test methods, test requirements and classifications for air handling units which are supplying and/or exhausting air, via ductwork, for ventilating/conditioning a part or the whole of the building. This standar
27、d is not applicable to the following: a) air conditioning units serving a limited area in a building, such as fan coil units; b) units for residential buildings; c) units producing ventilation air mainly for a manufacturing process. Except for the thermal and acoustic performance of the casing, the
28、test methods and requirements are applicable to both complete units and any separate sections. The filter bypass test is not applicable to the testing of high efficiency particulate air filters (HEPA). NOTEHEPA filters are recommended to be installed downstream of the air handling unit. Such install
29、ations should be leak tested in accordance with the appropriate filter standards. The test method for the thermal performance of the casing is applicable to the comparison of different constructions, but not to the calculation of thermal losses through the casing or the risk of condensation. Similar
30、ly, the test method for the acoustic performance of the casing is applicable to the comparison of different constructions, but not to the provision of accurate acoustic data for specific units. 2 Normative references This European Standard incorporates, by dated or undated reference, provisions from
31、 other publications. These normative references are cited at the appropriate places in the text and the publications are listed below. For dated references, any subsequent amendments or revisions to these publications only apply to this European Standard when incorporated in it by amendment or revis
32、ion. For undated references the latest edition of the publication referred to applies. CR 12792:1997, Ventilation for buildings Symbols and terminology. prEN 13053, Ventilation for buildings Air handling units Ratings and performance for components and sections. EN 292-2, Safety of machinery Basic c
33、oncepts, general principles for design Part 2: Technical principles and specifications. EN 779, Particulate air filters for general ventilation Requirements, testing, marking. EN 61310-1, Safety of machinery Indication, marking and actuating Part 1: Requirements for visual, auditory and tactile sign
34、als. ISO 3744, Acoustics Determination of sound power levels of noise sources using sound pressure Engineering methods in an essentially free field over a reflecting plane. ISO 11546-2, Acoustics Determination of sound insulation performances of enclosures Part 2: Measurements in situ (for acceptanc
35、e and verification purposes). 3 Definitions For the purposes of this standard the definitions given in CR 12792:1997 apply, together with the following. 3.1 air handling unit a factory made encased unit serving as a prime mover of a ventilation or air conditioning installation where outdoor air, rec
36、irculation air and exhaust air is treated, consisting of a fan section where a filter section and heat exchanger may be connected. In addition the unit may consist of an inlet section with one or more louvres, dampers and valves, a mixing section, heat recovery section, one or more heating and cooli
37、ng coils, humidifiers, sound attentuators and additional equipment such as controls, measuring sections, etc. Licensed Copy: sheffieldun sheffieldun, na, Mon Oct 30 10:13:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 5 EN 1886:1998 BSI 1998 Figure 2 Illustration of panel and frame scans of air
38、handling units 4 Mechanical strength of casing 4.1 Requirements and classification 4.1.1 Air handling unit casings shall be categorized into classes 1, 1A, 1B, 2 and 2A in accordance with Table 1. Table 1 Casing strength classifications of air handling units Casing classMaximum relative deflection W
39、ithstand maximum fan pressure mmm21 110no 1A10yes 1Bno requirementsyes1) 24no 2A4yes 1) For class 1B, the deflection shall not cause permanent deformation. Furthermore, after 5 min operating under maximum fan pressure, the leakage of the unit shall not increase by more than 5 %. The leakage test sha
40、ll be done before and after the strength test at maximum pressure. 4.1.2 Class 1 and class 2 casings shall be designed and selected such that the maximum deflection of any span of the panels and/or frames does not exceed the limits in Table 1 when the unit is running at its operating conditions; see
41、 Figure 2. In addition to meeting the deflection limits of classes 1 and 2, respectively, class 1A and class 2A casings shall also be capable of withstanding the maximum pressure generated by the fan at its design operating speed, without damage to the unit or visible permanent deformation of the ca
42、sing. This may be demonstrated, by prior agreement between manufacturer and purchaser, by blanking off the inlets to the unit and running the fan up to its design operating speed. Downstream sections of blow-through units shall be proved by blanking off the air handling units outlets. Any special re
43、quirements, for example the ability to survive shock loading caused by sudden closure of fire dampers, should be clearly specified. 4.2 Testing Deflection shall be measured within an uncertainty of 0,5 mm whilst the air handling unit is operating at its normal design condition; for example, referrin
44、g to Figure 3, X9X99 measured for span R9S9, XX99 is measured for span PQ. Deflection X9X99 is a function of panel stiffness. Deflection XX99 is a function of both frame and panel stiffness. Frame deflection is RR9 and SS9. EXAMPLE PQ = 2 m; R9S9 = RS = 1 m; measured deflection XX99 = 8 mm; measured
45、 deflection X9X99 = 5 mm. Hence, the deflection of span R9S9 is 5 mmm21and that of span PQ is 4 mmm21. The class is determined by the highest value of the measured deflections. In this example the deflection of R9S9 (the shortest span) determines that class 1 is met. Licensed Copy: sheffieldun sheff
46、ieldun, na, Mon Oct 30 10:13:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 6 EN 1886:1998 BSI 1998 Figure 3 Deflection of panels and frames of air handling units 5 Casing air leakage 5.1 Requirements and classification 5.1.1 Units operating under negative pressure only The air leakage of the as
47、sembled air handling unit shall be tested at 400 Pa negative pressure, and it shall not exceed the applicable rate given in Table 2. Table 2 Casing air leakage classes of air handling units, 400 Pa negative test pressure Leakage classMaximum leakage rate Filter class (EN 779) ls21m22 3A3,96G1-4 A1,3
48、2F5-7 B0,44F8-9 Unless otherwise specified, the applicable rate shall be a function of the efficiency of the air filters within the air handling unit. Where there is more than one stage of air filtration, the classification shall be based on the efficiency of the highest grade of filter. NOTEFor spe
49、cial applications, by agreement, leakage class may be chosen independent from the filter class. Even if the unit is not equipped with filters, class 3A is still recommended. 5.1.2 Units operating under both negative and positive pressure Air handling units with sections operating under positive pressure shall have the positive pressure sections tested separately from the rest of the unit in all cases where the operating pressure immediately downstream of the fan exceeds 250 Pa positive. If the positive
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