1 Scope
This standard specifies tests for determining one or more performance characteristics of fans installed in an operational circuit when handling a single (monophase) fluid.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this standard. However parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition applies.
GB/T 2624-1993 Measurement of fluid flow by means of orifice plates, nozzles and Venturi tubes inserted in circular cross-section conduits running full (eqv ISO 5167-1:1991)
GB/T 1236-2000 Industrial fans - Performance testing using standardized airways (idt ISO 5801:1997)
GB 755-2000 Rotating electrical machine - Part 1: Rating and performance (idt IEC 60034-1:1996)
IEC 60051-8 Direct acting indicating analogue electrical measuring instruments and their accessories - Part 8: Special requirements for accessories
3 Terms, definitions and symbols
3.1 Terms and definitions
For the purposes of this International Standard, the following terms and definitions apply.
3.1.1
air
air or other gas, except when specifically referred to as atmospheric air
3.1.2
standard air
atmospheric air having a density of exactly 1.2 kg/m3
Note: atmospheric air at a temperature of 16 ℃, a pressure of 100 000 Pa and a relative humidity of 65%, has a density of 1.2 kg/m3, but these conditions are not part of the definition.
3.1.3
fan
rotary machine which maintains a continuous flow of air at a pressure ratio not normally exceeding 1.3
3.1.4
impeller
rotating part of a fan which, by means of its blades, transfers energy to the air
3.1.5
casing
those stationary parts of a fan which direct the flow of air from the fan inlet opening(s) to the fan outlet opening(s)
3.1.6
duct
airway in which the air velocity is comparable with that at the fan inlet or outlet
3.1.7
chamber
airway in which the air velocity is small compared with that at the fan inlet or outlet
3.1.8
transition piece
airway along which there is a gradual change of cross-sectional area and/or shape
3.1.9
test enclosure
room, or other space protected from draught, in which the fan and test airways are situated
3.1.10
area of the conduit section x, Ax
area of the conduit at section x
3.1.11
fan inlet area, A1
by convention, the gross area in the inlet plane inside the casing
Note: the fan inlet plane should be taken as that surface bounded by the upstream extremity of the air moving device. In this standard, the fan inlet plane is indicated by plane 1 (see Figure 1).
Foreword i
ISO Introduction iii
1 Scope
2 Normative references
3 Terms, definitions and symbols
4 Quantities to be measured
5 General conditions and procedures concerning in situ tests
6 Instrumentation
7 Determination of fan pressure
8 Determination of flowrate
9 Determination of power
10 Uncertainty associated with the determination of fan performance
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
