BS EN ISO 5801:2017+A1:2025 Fans. Performance testing using standardized airways, 2025
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- Foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Symbols, abbreviated terms and subscripts
- 4.1 Symbols and abbreviated terms
- 4.2 Subscripts
- 5 General
- 6 Test configurations
- 6.1 General
- 6.2 Category A configuration
- 6.3 Category B configuration
- 6.4 Category C configuration
- 6.5 Category D configuration
- 6.6 Inlets and outlets
- 6.7 Fans with significant swirl
- 6.8 Airways
- 6.9 Test space
- 6.10 Leakage
- 6.11 Test report
- 7 Carrying out the test
- 7.1 Working fluid
- 7.2 Rotational speed
- 7.3 Steady operation
- 7.4 Ambient conditions
- 7.5 Pressure readings
- 7.6 Test for a specified duty
- 7.7 Test for a fan characteristic curve
- 7.8 Operating range
- 8 Airways for duct simulations
- 8.1 General
- 8.2 Common segments at fan inlet (iCS)
- 8.3 Inlet duct simulation (iDS)
- 8.4 Common segment at fan outlet (oCS)
- 8.5 Outlet duct simulation (oDS)
- 8.6 Long duct (LD)
- 8.7 Loss allowances for standardized airways
- 8.7.1 Loss allowances for an inlet common segment (iCS)
- 8.7.2 Loss allowances for inlet duct simulation (iDS)
- 8.7.3 Loss allowances for outlet common segments (oCS)
- 8.7.4 Loss allowances for duct simulation at outlet (oDS)
- 8.7.5 Loss allowances for long duct (LD)
- 9 Standardized test chambers
- 9.1 General
- 9.2 Pressure tappings
- 9.3 Flow-settling means
- 9.3.1 General
- 9.3.2 Piezometer ring check
- 9.3.3 Blow through verification test
- 9.3.4 Outlet chamber reverse flow verification test
- 9.4 Standardized inlet test chambers (iTC)
- 9.4.1 Test chambers
- 9.4.2 Fan under test
- 9.5 Standardized outlet test chambers (oTC)
- 9.5.1 Test chambers
- 9.5.2 Fan under test
- 10 Various component parts for a laboratory setup
- 10.1 General
- 10.2 Variable supply system
- 10.2.1 General
- 10.2.2 Throttling device
- 10.2.3 Auxiliary fan
- 10.3 Straightener
- 10.3.1 General
- 10.3.2 Cell straightener
- 10.3.3 Star straightener
- 10.4 Transition parts
- 10.4.1 General
- 10.4.2 Rectangular/circular transition
- 10.4.3 Circular/circular transition
- 10.4.4 Connection for double-inlet fans
- 11 Standard test configurations
- 11.1 Units
- 11.2 Measuring flow rate
- 11.3 Standard test configurations A
- 11.4 Standard test configurations B
- 11.5 Standard test configurations C
- 11.6 Standard test configurations D
- 12 Measurements
- 12.1 Calibration
- 12.2 Dimensions and cross-sectional areas
- 12.2.1 Tolerance on dimensions
- 12.2.2 Cross-sectional area
- 12.3 Rotational speed
- 12.4 Power input
- 12.4.1 General
- 12.4.2 Motor input power
- 12.4.3 Fan shaft power
- 12.4.4 Impeller power
- 12.4.5 Transmission systems
- 12.5 Mass flow rate
- 12.6 Temperature
- 12.6.1 General
- 12.6.2 Accuracy of temperature measurement
- 12.6.3 Correction for high velocities
- 12.7 Humidity
- 12.8 Pressure
- 12.8.1 Barometers
- 12.8.2 Manometers
- 12.8.3 Damping of manometers
- 12.8.4 Checking of manometers
- 12.8.5 Position of manometers
- 12.8.6 Average pressure in an airway
- 12.8.7 Construction of tappings
- 12.8.8 Position and connections
- 12.8.9 Methods of measurement
- 12.8.10 Checks for compliance
- 12.8.11 Use of Pitot-static tube
- 12.9 Air properties
- 12.9.1 General
- 12.9.2 Density of air at section x
- 12.9.3 Air viscosity
- 12.9.4 Standard air
- 13 Reference conditions
- 14 General rules for conversion of test results
- 14.1 General
- 14.2 Laws on fan similarity
- 14.2.1 General
- 14.2.2 Geometrical similarity
- 14.2.3 Reynolds number similarity
- 14.2.4 Mach number and similarity of the velocity triangles
- 15 Calculations
- 15.1 Test results
- 15.1.1 General
- 15.1.2 Temperature
- 15.1.3 Pressure
- 15.1.4 Set of formulae
- 15.1.5 Simplified sets of formulae, which can be used for v2.ref ≤ 65m/s
- 15.1.6 Fan pressure
- 15.1.7 Fan static pressure
- 15.1.8 Volume flow rate of the fan
- 15.1.9 Fan air power and efficiency
- 15.2 Efficiencies
- 15.2.1 General
- 15.2.2 Fan static air power and static efficiency
- 15.3 Conversion rules
- 15.3.1 General
- 15.3.2 Shaft power and impeller power
- 16 Fan characteristic curves
- 16.1 Methods of plotting
- 16.2 Characteristic curves at constant speed
- 16.3 Characteristic curves at inherent speed
- 16.4 Complete fan characteristic curve
- 16.5 Test for a specified duty
- 16.6 Specific fan types
- 17 Uncertainty analysis
- 17.1 Principle
- 17.2 Pre-test and post-test analysis
- 17.3 Analysis procedure
- 17.4 Propagation of uncertainties
- 17.5 Reporting uncertainties
- 17.6 Maximum allowable uncertainties for measurements
- 17.7 Maximum allowable uncertainty of results
- Annex A (normative) Determination of air flow rate
- Annex B (informative) Fan-powered roof exhaust ventilators
- Annex C (informative) Chamber leakage test procedure
- Annex D (informative) Fan outlet elbow in the case of a non-horizontal discharge axis
- Annex E (informative) Input power calculation for driven fans at design point
- Annex F (informative) Motor fed from a variable frequency speed device
- Annex G (informative) Axial fans without outlet guide vanes
- Annex H (informative) Vapour pressure, pv
- Annex I (informative) Clearances
- Annex J (normative) Polytropic approach for the calculation of pfC from pfTe
- Annex K (informative) Examples for test setups
- Annex L (informative) Measurement of plenum fans and plug fans
- Annex M (informative) Comparison of NEMA methodology for calculation motor efficiency with IEC
- Annex N (informative) Report and results of test
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