ISO 13348:2007 産業用ファン—公差、変換方法、技術データの提示 | ページ 6

3.1

industrial fan

fan other than that used for household or similar purposes such as air circulation, climatization

Note 1 to entry: For the purpose of this International Standard and other industrial fan standards, a household fan is defined as having a single-phase motor operating at a maximum of 250 V and 16 A. With a sufficiently soft start, this equates to an input power of not more than 3 kW.

3.2

series-produced fan

catalogue fan

fan whose detailed performances is widely available in a catalogue (electronic and or printed), and which is frequently manufactured in significant quantities and available on short delivery

3.3

average stagnation pressure at a section x

p_sgx

Note 2 to entry: It is expressed in pascals (Pa).

3.4

average total pressure at a section x

p_tx

Note 1 to entry: When the Mach number, Ma , is less than 0,122, the Mach factor, F_Mx, can be neglected

Note 2 to entry: See ISO 5801, ISO 5802 and 13349 for definitions.

3.5

characteristic error

flow rate change produced along the actual system characteristic by the maximum fan performance deviation allowed by the tolerance grade selected

Note 1 to entry: Characteristic error is a function of the tolerance grade, the measurement uncertainty allowed, and the shape (local slope) of the fan and actual system characteristics

Note 2 to entry: For the actual system characteristics, see ISO 5801.

3.6

fan aerodynamic characteristic curves

fan pressure, power, efficiency, etc., against flow rate under specified ambient conditions and at a constant speed, or when fitted with a specified motor

3.7

fan dynamic pressure at outlet

p_d2

Note 1 to entry: It is expressed in pascals (Pa).

3.8

fan flow coefficient

φ

3.9

fan outlet area

A₂

area inside the fan outlet casing flange

Note 1 to entry: It is expressed in square metres (m²).

3.10

fan pressure

p_F

Note 1 to entry: When expressing fan pressure, reference should be made to the installation category A, B, C or D.

Note 2 to entry: It is expressed in pascals (Pa).

3.11

fan static pressure

p_sF

Note 1 to entry: It is expressed in pascals (Pa).

3.12

Mach factor

F_M

Note 2 to entry: It is dimensionless.

3.13

Mach number at a point

Ma

ratio of the gas velocity at a point to the velocity of sound

where

c	is the velocity of sound, ;
Rw	is the gas constant of humid gas.

Note 1 to entry: It is dimensionless.

3.14

Mach number at a section x

Ma_x

Note 1 to entry: It is dimensionless.

3.15

optimum efficiency

η_opt

maximum efficiency achieved on the fan air characteristic with all operational parameters, except the air system resistance, being fixed

Note 1 to entry: It is expressed as a percentage.

3.16

peripheral Reynolds number

Re_u

Reynolds number based on the tip speed, u

Note 1 to entry: It is dimensionless.

3.17

power coefficient

λ

3.18

pressure coefficient

Ψ

3.19

tip speed

u

peripheral speed of the impeller blades at their maximum diameter

Note 1 to entry: It is expressed in metres per second (m · s⁻¹).

3.20

total sound power level

L_W

unweighted sound power level defined as 10 times the logarithm to the base 10 of the ratio of the sound power in watts to a reference value of 10⁻¹² W (1 picowatt [pW])

Note 1 to entry: It is expressed in decibels (dB).

3.21

octave band sound power level

L_{W fc}

sound power level in an octave band with a defined centre frequency, defined as 10 times the logarithm to the base 10 of the ratio of the sound power in watts to a reference value of 10⁻¹² W (1 picowatt [pW])

Note 1 to entry: It is expressed in decibels (dB).

3.22

A-weighted sound power level

L_{W A}

total sound power level using A-weighting

Note 1 to entry: See IEC 61672-1 for a definition of A-weighting.

Note 2 to entry: It is expressed in decibels (dB).

3.23

total sound pressure level

L_p

unweighted total sound pressure level at a specified point and under specified conditions, normally in the octave bands with centre frequencies from 63 Hz to 8 kHz, defined as 10 times the logarithm to the base 10 of the ratio of the square of the sound pressure to the reference value of 20 µPa

Note 1 to entry: It is expressed in decibels (dB).

3.24

A-weighted sound pressure level

L_{p A}

total sound pressure level using A-weighting

Note 1 to entry: For a definition of A-weighting, see IEC 61672-1.

Note 2 to entry: It is expressed in decibels (dB).

3.25

tolerance zone

r ange of values of the specified parameters allowed, according to the applicable tolerance grade

3.26

tolerance grade

designation defining the limit deviations from the agreed or published technical performance parameters

3.27

dimensionless frequency

χ