EN 14705-2005 en Heat exchangers Method of measurement and evaluation of thermal performances of wet cooling towers《热交换器 湿冷却塔热性能的评价和测量方法》.pdf
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1、BRITISH STANDARDBS EN 14705:2005Heat exchangers Method of measurement and evaluation of thermal performances of wet cooling towersThe European Standard EN 14705:2005 has the status of a British StandardICS 27.060.30; 27.200g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48
2、g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 14705:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 28 July 2005 BSI 28 July 2005ISBN 0 580 46406 7National
3、 forewordThis British Standard is the official English language version of EN 1274:2005.The UK participation in its preparation was entrusted to Technical Committee RHE/30, Heat exchangers, which has the responsibility to: aid enquirers to understand the text; present to the responsible internationa
4、l/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 obtained on request to its secreta
5、ry.Cross-referencesThe British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogueunder the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue o
6、r 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 immunity from legal obligations.Summary of pagesThis document comprise
7、s a front cover, an inside front cover, the EN title page, pages 2 to 62, 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 publicationAmd. No. Date CommentsEUROPEAN STANDARDNORME EUROPENNEEUR
8、OPISCHE NORMEN 14705June 2005ICS 27.060.30; 27.200English versionHeat exchangers - Method of measurement and evaluation ofthermal performances of wet cooling towersEchangeurs de chaleur - Mthode de mesure et valuationdes performances thermiques des arorfrigrantshumidesWrmeaustauscher - Verfahren zur
9、 Messung undBewertung der wrmetechnischen Leistungskenndaten vonNasskhltrmenThis European Standard was approved by CEN on 24 March 2005.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 s
10、tandard without any alteration. Up-to-date lists and bibliographical references 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
11、language made by translationunder the responsibility of a CEN member into 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,
12、Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagemen
13、t Centre: rue de Stassart, 36 B-1050 Brussels 2005 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14705:2005: EEN 14705:2005 (E) 2Contents pageForeword 31 Scope .42 Normative references .43 Terms, definitions and symbols 53.1 Terms
14、and definitions.53.2 Symbols.74 Performance tests General115 Guarantee 125.1 General 125.2 Guarantee documents 125.3 Validity conditions for measurements 136 Test procedure 156.1 Test parameters 156.2 Quantities to be measured .156.3 Quantities to be determined.176.4 Measurements and calculation of
15、the mean quantities .176.5 Arrangement of measuring devices 246.6 Measuring apparatus 297 Conducting the performance tests307.1 Definition of a test.307.2 Duration of the test .318 Calculation methods.348.1 General 348.2 Methods .349 Evaluation of thermal performances .389.1 General 389.2 Basic ther
16、mal performance test evaluation 389.3 Extended thermal performance test evaluation3910 Test tolerance4710.1 General 4710.2 Error created by non-measurable systematic deviations of operating parameters.47Annex A (informative) Performance curves50Annex B (normative) Requirements concerning the measuri
17、ng apparatus used for the tests 54Annex C (normative) Calculation of the evaporated water flow rate 56Annex D (normative) Reminders on error calculations .59Annex E (normative) Cold water temperature correction for heat added by pump.61Bibliography.62EN 14705:2005 (E) 3Foreword This European Standar
18、d (EN 14705:2005) has been prepared by Technical Committee CEN/TC 110 “Heat exchangers”, 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 December 2005, and
19、 conflicting national standards shall be withdrawn at the latest by December 2005. This document includes a Bibliography. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium
20、, 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, Switzerland and United Kingdom. EN 14705:2005 (E) 41 Scope This European Sta
21、ndard specifies requirements, test methods and acceptance tests for thermal performances pumping head verification of wet cooling towers and plume abatement for wet/dry cooling towers. This European Standard is applicable to natural draught wet cooling towers (see in 3.1.2.2) fan assisted natural dr
22、aught cooling tower (see 3.1.2.3), wet/dry cooling towers (see 3.1.2.4) and “Mechanical draught cooling towers“, except series ones. It specifies the test methods, the apparatus required, the limitation of errors and the method for results examination. The acceptance testing covers the verification
23、of the thermal performance data and pumping head of the cooling tower as specified in the contract between the supplier and the purchaser. If these tests are required then this should be recognized at the time of the contract, as additional fittings, and preparations for the test may be required. De
24、viations from the rules laid down below as well as additions need special agreement between purchaser and supplier and should be documented. This standard does not apply to mechanical draught series wet cooling towers which are dealt with in EN 13741. NOTE Terms like “design“, “values“, “guarantee“
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