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EN 13741:2003

Current
Current

The latest, up-to-date edition.

Thermal performance acceptance testing of mechanical draught series wet cooling towers
Published date

10-12-2003

Foreword
1 Scope
2 Normative references
3 Terms, definitions and symbols
  3.1 Terms and definitions
  3.2 Symbols
4 Performance tests - General
  4.1 Subject of the thermal performance acceptance
  4.2 Performance curves
      4.2.1 Performance curves format
      4.2.2 Performance curve parameters
5 Measuring procedures and instrumentation
  5.1 General
  5.2 Measurements
      5.2.1 Temperatures
      5.2.2 Water flow
      5.2.3 Fan power
      5.2.4 Cooling tower pumping head
      5.2.5 Temperature and flow of make up and blow down
6 Acceptance tests
  6.1 General
      6.1.1 Introduction
      6.1.2 Time of the acceptance test
      6.1.3 Management of the acceptance tests
  6.2 Preparation of acceptance tests
      6.2.1 Number and arrangement of the measuring points
      6.2.2 Condition of the plant
  6.3 Execution of acceptance tests
      6.3.1 Pre conditions
      6.3.2 Trial measurements
      6.3.3 Acceptable deviations of operating conditions
      6.3.4 Operating conditions during the test
      6.3.5 Frequency of readings
      6.3.6 Test duration
      6.3.7 Validity of test results
7 Assessment of test results in view of guaranteed
  performance data
  7.1 Assessment of test results
  7.2 Finding of face values from performance data
  7.3 Comparison with the guaranteed performance data
8 Test tolerance
  8.1 General
  8.2 Error created by measuring tolerances
      8.2.1 Influence of wet bulb measurement
            uncertainties phi[w]
      8.2.2 Influence of cooling range measurement
            uncertainties phi[z]
      8.2.3 Influence of fan power measurement
            uncertainties phi[F]
      8.2.4 Influence of water flow rate measurement
            uncertainties phi[m]
  8.3 Determination of measuring equipment tolerances
  8.4 Determination of measuring tolerances
  8.5 Determination of random errors
  8.6 Determination of the test tolerance
9 Test report
Annex A (informative) Example
Annex B (informative) Performance curves
Annex C (informative) Position of measuring points
        for cooling towers
Annex D (informative) Test Result analysis
Bibliography

This European Standard specifies requirements, test method and acceptance tests for thermal performance of mechanical draught series cooling towers. This European Standard is applicable to series type wet cooling towers as defined in 3.1. The acceptance testing covers the verification of the thermal and hydraulic performance data of the cooling tower selected from the product line (see 3.1) and specified in the contract between the supplier and the purchaser.

Committee
CEN/TC 110
DocumentType
Standard
PublisherName
Comite Europeen de Normalisation
Status
Current

Standards Relationship
BS EN 13741:2003 Identical
PN EN 13741 : 2004 Identical
UNE-EN 13741:2004 Identical
SN EN 13741 : 2004 Identical
I.S. EN 13741:2004 Identical
UNI EN 13741 : 2004 Identical
NEN EN 13741 : 2004 Identical
NBN EN 13741 : 2004 Identical
NS EN 13741 : 1ED 2004 Identical
NF EN 13741 : 2004 Identical
DIN EN 13741:2004-05 Identical

DIN EN 14705:2005-10 Heat exchangers - Method of measurement and evaluation of thermal performances of wet cooling towers; German version EN 14705:2005
DIN EN 14705 E : 2005 HEAT EXCHANGERS - METHOD OF MEASUREMENT AND EVALUATION OF THERMAL PERFORMANCES OF WET COOLING TOWERS
BS EN 14705:2005 Heat exchangers. Method of measurement and evaluation of thermal performances of wet cooling towers
EN 14705:2005 Heat exchangers - Method of measurement and evaluation of thermal performances of wet cooling towers

ISO 3354:2008 Measurement of clean water flow in closed conduits — Velocity-area method using current-meters in full conduits and under regular flow conditions
EN 306:1997 Heat exchangers - Methods of measuring the parameters necessary for establishing the performance
EN ISO 5167-1:2003 Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full - Part 1: General principles and requirements (ISO 5167-1:2003)
ISO 8316:1987 Measurement of liquid flow in closed conduits Method by collection of the liquid in a volumetric tank
ISO 3966:2008 Measurement of fluid flow in closed conduits Velocity area method using Pitot static tubes

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