NS EN 13741 : 1ED 2004

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

Provides requirements, test method and acceptance tests for thermal performance of mechanical draught series cooling towers.