Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions and symbols
3.1 Terms and definitions
3.2 Symbols
4 Quantities to be measured
5 General conditions and procedures
concerning in situ tests
5.1 General recommendations
5.2 Selection of test point when only the
system resistance to be varied
5.3 Fans fitted with adjustment devices
5.4 System throttling devices allowing the system
resistance to be altered
5.5 Selection of the test point when the system
resistance cannot be varied
5.6 When correction of the coefficient deduced from
the test is not necessary
6 Instrumentation
6.1 Instrumentation for measurement of pressure
6.2 Measurement of air velocity
6.3 Measurement of temperature
6.4 Determination of density
6.5 Measurement of rotational speed
7 Determination of fan pressure
7.1 Location of pressure measurement plane
7.2 Measurement of fan pressure
8 Determination of flow rate
8.1 Choice of measuring method
8.2 Choice of measuring section
8.3 Determination of flowrate using differential pressure
devices
8.4 Determination of flowrate by velocity area methods
9 Determination of power
9.1 Definition of performance characteristics
relating to the power of a fan
9.2 Losses during transmission of power from
the motor to the impeller
9.3 Methods for determination of power
9.4 Measuring instruments
9.5 Precautions to be taken during in situ tests
10 Uncertainty associated with the determination of
fan performance
10.1 General
10.2 Performance errors
10.3 Uncertainty of measurement
10.4 Specified uncertainties
10.5 Analysis of uncertainty
Annex A (normative) - Position of exploration lines for
a marginal wall profile compatible with a general
power law
Annex B (normative) - Determination of the position of the
marginal exploration lines in cases not covered
by Annex A
Annex C (normative) - Minimum straight lengths required
upstream and downstream of the differential
pressure devices (DP device) used for flow measurement
Annex D (normative) - Loss allowance for straight, smooth ducts
and standardized airways
Annex E (normative) - Rotating vane anemometer calibration
Bibliography