BS 848-1(2007) : 2007 COR 2010

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and units
   4.1 Symbols
   4.2 Subscripts
5 General
6 Instruments for pressure measurement
   6.1 Barometers
   6.2 Manometers
   6.3 Damping of manometers
   6.4 Checking of manometers
   6.5 Position of manometers
7 Determination of average pressure in an airway
   7.1 Methods of measurement
   7.2 Use of wall tappings
   7.3 Construction of tappings
   7.4 Position and connections
   7.5 Checks for compliance
   7.6 Use of Pitot-static tube
8 Measurement of temperature
   8.1 Thermometers
   8.2 Thermometer location
   8.3 Humidity
9 Measurement of rotational speed
   9.1 Fan shaft speed
   9.2 Acceptable instruments
10 Determination of power input
   10.1 Measurement accuracy
   10.2 Fan shaft power
   10.3 Determination of fan shaft power by
        electrical measurement
   10.4 Impeller power
   10.5 Transmission systems
11 Measurement of dimensions and determination of areas
   11.1 Flow-measurement devices
   11.2 Tolerance on dimensions
   11.3 Determination of cross-sectional area
12 Determination of air density, humid gas constant
   and viscosity
   12.1 Density of air in the test enclosure at section x
   12.2 Determination of vapour pressure
   12.3 Determination of air viscosity
13 Determination of flow rate
   13.1 General
   13.2 In-line flowmeters (standard primary devices)
   13.3 Traverse methods
14 Calculation of test results
   14.1 General
   14.2 Units
   14.3 Temperature
   14.4 Mach number and reference conditions
   14.5 Fan pressure
   14.6 Calculation of stagnation pressure at a reference
        section of the fan from gauge pressure, p[ex']
        measured at a section x of the test duct
   14.7 Inlet volume flow rate
   14.8 Fan air power and efficiency
15 Rules for conversion of test results
   15.1 Laws on fan similarity
   15.2 Conversion rules
16 Fan characteristic curves
   16.1 General
   16.2 Methods of plotting
   16.3 Characteristic curves at constant speed
   16.4 Characteristic curves at inherent speed
   16.5 Characteristic curves for adjustable-duty fan
   16.6 Complete fan characteristic curve
   16.7 Test for a specified duty
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 measurement
   17.7 Maximum allowable uncertainty of results
18 Selection of test method
   18.1 Classification
   18.2 Installation categories
   18.3 Test report
   18.4 User installations
   18.5 Alternative methods
   18.6 Duct simulation
19 Installation of fan and test airways
   19.1 Inlets and outlets
   19.2 Airways
   19.3 Test enclosure
   19.4 Matching fan and airway
   19.5 Outlet area
20 Carrying out the test
   20.1 Working fluid
   20.2 Rotational speed
   20.3 Steady operation
   20.4 Ambient conditions
   20.5 Pressure readings
   20.6 Tests for a specified duty
   20.7 Tests for a fan characteristic curve
   20.8 Operating range
21 Determination of flow rate
   21.1 Multiple nozzle
   21.2 Conical or bellmouth inlet
   21.3 Orifice plate
   21.4 Pilot-static tube traverse
22 Determination of flow rate using multiple nozzles
   22.1 Installation
   22.2 Geometric form
   22.3 Inlet zone
   22.4 Multiple-nozzle characteristics
   22.5 Uncertainty
23 Determination of flow rate using a conical or bellmouth
   inlet
   23.1 Geometric form
   23.2 Screen loading
   23.3 Inlet zone
   23.4 Conical inlet performance
   23.5 Bellmouth inlet performance
   23.6 Uncertainties
24 Determination of flow rate using an orifice plate
   24.1 Installation
   24.2 Orifice plate
   24.3 Ducts
   24.4 Pressure tappings
   24.5 Calculation of mass flow rate
   24.6 Reynolds number
   24.7 In-duct orifice with D and D/2 taps
   24.8 Outlet orifice with wall tappings
25 Determination of flow rate using a Pitot-static tube
   traverse
   25.1 General
   25.2 Pitot-static tube
   25.3 Limits of air velocity
   25.4 Location of measurement points
   25.5 Determination of flow rate
   25.6 Flow rate coefficient
   25.7 Uncertainty of measurement
26 Installation and setup categories
   26.1 Category A: free inlet and free outlet
   26.2 Category B: free inlet and ducted outlet
   26.3 Category C: ducted inlet and free outlet
   26.4 Category D: ducted inlet and ducted outlet
   26.5 Test installation type
27 Flow straighteners
   27.1 Types of straightener
   27.2 Rules for use of a straightener
28 Common-segment airways for ducted fan installations
   28.1 Common segments
   28.2 Common segment at fan outlet
   28.3 Common segment at fan inlet
   28.4 Outlet duct simulation
   28.5 Inlet duct simulation
   28.6 Loss allowances for standardized airways
29 Standardized test chambers
   29.1 Test chamber
   29.2 Variable supply and exhaust systems
   29.3 Standardized inlet test chambers
   29.4 Standardized outlet test chambers
30 Standard methods with test chambers - Category A
   installations
   30.1 Types of fan setup
   30.2 Inlet-side test chambers
   30.3 Outlet-side test chambers
31 Standard test methods with outlet-side test
   ducts - Category B installations
   31.1 Types of fan setup
   31.2 Outlet-side test ducts with antiswirl device
   31.3 Outlet chamber test ducts without antiswirl device
32 Standard test methods with inlet-side test ducts or
   chambers - Category C installations
   32.1 Types of fan setup
   32.2 Inlet-side test ducts
   32.3 Inlet-side test chambers
33 Standard methods with inlet- and outlet-side test
   ducts - Category D installations
   33.1 Types of fan setup
   33.2 Installation category B with outlet antiswirl
        device and with an additional inlet duct or
        inlet-duct simulation
   33.3 Installation category B without outlet antiswirl
        device nor common segment, modified with addition
        of an inlet duct or inlet-duct simulation
   33.4 Installation category C with common inlet duct,
        modified with the addition of an outlet common
        segment with antiswirl device
   33.5 Installation category C, modified with the addition
        of an outlet-duct simulation without antiswirl device
Annex A (normative) - Fan pressure and fan installation
                      category
Annex B (normative) - 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) - Electrical input power consumed by a
                        fan installation
Annex F (informative) - Preferred methods of performance testing
Bibliography

Defines the determination of the performance of industrial fans of all types except those designed solely for air circulation, e.g. ceiling fans and table fans.