BS EN 305-1997 Heat exchangers - Definitions of performance of heat exchangers and the general test procedure for establishing performance of all heat exchangers《热交换器 热交换器的性能定义和确定所.pdf
《BS EN 305-1997 Heat exchangers - Definitions of performance of heat exchangers and the general test procedure for establishing performance of all heat exchangers《热交换器 热交换器的性能定义和确定所.pdf》由会员分享,可在线阅读,更多相关《BS EN 305-1997 Heat exchangers - Definitions of performance of heat exchangers and the general test procedure for establishing performance of all heat exchangers《热交换器 热交换器的性能定义和确定所.pdf(18页珍藏版)》请在麦多课文档分享上搜索。
1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 305 : 1997 ICS 27.0
2、60.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Heat exchangers Definitions of performance of heat exchangers and the general test procedure for establishing performance of all heat exchangersBS EN 305 : 1997 This British Standard, having been prepared under the directio
3、n of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 July 1997 BSI 1997 The following BSI references relate to the work on this standard: Committee reference RHE/30 ENV 305 ISBN 0 580 27624 4 Amendments issued since publication Amd.
4、No. Date Text affected Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee RHE/30, Heat exchangers, upon which the following bodies were represented: British Refrigeration Association Building Services Research and Informatio
5、n Association Federation of Environmental Trade Associations HEVAC Association Water Heaters Manufacturers AssociationBS EN 305 : 1997 BSI 1997 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN 305 3ii BSI 1997 BS EN 305 : 1997 National foreword Thi
6、s British Standard has been prepared by Technical Committee RHE/30 and is the English language version of EN 305 : 1997 Heat exchangers Definitions of performance of heat exchangers and the general test procedure for establishing performance of all heat exchangers, published by the European Committe
7、e for Standardization (CEN). EN 305 : 1997 was produced as a result of international discussions in the UK took an active part. 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,
8、 pages i and ii, the EN title page, pages 2 to 14, an inside back cover and a back cover.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 1997 Copyright reserved to CEN members Ref
9、. No. EN 305 : 1997 E EUROPEAN STANDARD EN 305 NORME EUROPE ENNE EUROPA ISCHE NORM January 1997 ICS 27.060.30 Supersedes ENV 305 : 1990 Descriptors: Heat transfer, heat exchangers, definitions, thermodynamic properties, tests, information English version Heat exchangers Definitions of performance of
10、 heat exchangers and the general test procedure for establishing performance of all heat exchangers Echangeurs thermiques De finitions de la performance des e changeurs thermiques et proce dure ge ne rale dessai pour la de termination de la performance de tous les e changeurs thermiques Wa rmeaustau
11、scher Begriffe und allgemeine Festlegungen bei der Pru fung zur Leistungsbestimmung This European Standard was approved by CEN on 1996-12-27. 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 nat
12、ional 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 a
13、ny 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, Denmark, Finland, France, Germany, Greece, Ice
14、land, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.Page 2 EN 305 : 1997 BSI 1997 Foreword This European Standard has been prepared by Technical Committee CEN/TC 110, Heat exchangers, the secretariat of which is held by BSI. This European St
15、andard supersedes ENV 305 : 1990. 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 July 1997, and conflicting national standards shall be withdrawn at the latest by July 1997. According to the CEN/
16、CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and
17、 the United Kingdom. Contents Page Foreword 2 Introduction 3 1 Scope 3 2 Normative references 3 3 Symbols and abbreviations 3 3.1 Roman letters 3 3.2 Greek letters 3 3.3 Subscripts 4 4 Definitions and meaning of performance 4 4.1 Basic terms 4 4.2 Parameters characterizing heat exchangers 5 4.3 Ener
18、gy balance 5 4.4 Heat transfer coefficients 5 4.5 Heat transfer surface 6 5 Performance parameters 6 5.1 Characteristic entities 6 5.2 Ratios 8 6 General information on test procedures 11 6.1 Introduction 11 6.2 Test conditions 12 6.3 Test procedure 12 Annexes A (informative) Energy balance 13 B (in
19、formative) Heat transfer coefficients 13Page 3 EN 305 : 1997 BSI 1997 1) Kelvin (K) is used for absolute temperature and temperature difference. Introduction This European Standard is one of a series of European Standards dedicated to heat exchangers. This standard provides the manufacturer with inf
20、ormation for presenting performance characteristics for a heat exchanger in varying operating situations. These characteristics form the basis for determination of the exchangers condition, both when it is new and after having been in operation for some time. This standard also supplies the purchase
21、r of the heat exchanger with the information necesary for specifying and selecting the product which best meets his needs. This standard is also intended to be used in connection with type approval testing to serve as a source of information for certification, if required. 1 Scope This European Stan
22、dard specifies general terms and calculations used in determining performance of heat exchangers including related theory and general test procedure. This European Standard applies to heat exchangers classified according to the general arrangement of heat transfer specified by heat transfer surface
23、types of 4.1 and 4.2 of prEN 247 : 1996. This European Standard applies when referenced by the various branch application standards. The specific application European Standards shall be the prime reference documents. 2 Normative references This European Standard incorporates by dated or undated refe
24、rence, provisions from 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
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