ISO 12759-4:2019 ファン—ファンの効率分類—パート4：最大動作速度で駆動されるファン | ページ 6

3.1

fan

rotary-bladed machine that receives mechanical energy and utilizes it by means of one or more impellers fitted with blades to maintain a continuous flow of air or other gas passing through it and whose work per unit mass does not normally exceed 25 kJ/kg

Note 1 to entry: Fans are defined according to their installation category, function, fluid path and operating conditions (see ISO 13349).

[SOURCE: ISO 13349:2010, 3.1.1, — Notes to entry 1 and 3 were deleted.]

3.2

fan size

nominal diameter of the impeller

3.3

drive

mechanism used to power the fan which includes the motor, belt, couplings, chains, transmission and VFDs

3.4

driven fan

impeller fitted to or connected to a motor, with or without a drive mechanism, housing or means of variable speed drive

Note 1 to entry: See Figure 1.

3.5

air

working fluid for tests with standardized airways shall be atmospheric air

[SOURCE: ISO 5801:2017, 3.1]

3.6

installation category A

installation with free inlet and free outlet with a partition

[SOURCE: ISO 13349:2010, 3.4.1, modified — References to ISO 5801 and ISO 5802 were deleted.]

3.7

installation category B

installation with free inlet and ducted outlet

[SOURCE: ISO 13349:2010, 3.4.2, modified — References to ISO 5801 and ISO 5802 were deleted.]

3.8

installation category C

installation with ducted inlet and free outlet

[SOURCE: ISO 13349:2010, 3.4.3, modified — References to ISO 5801 and ISO 5802 were deleted.]

3.9

installation category D

installation with ducted inlet and ducted outlet

[SOURCE: ISO 13349:2010, 3.4.4, modified — References to ISO 5801 and ISO 5802 were deleted.]

3.10

density at fan inlet

ρ₁

fluid density calculated from the absolute pressure and the static temperature at the fan inlet

3.11

fan pressure

p_f

difference between the stagnation pressure at the fan outlet and the stagnation pressure at the fan inlet

3.12

mass flow rate

q_m

mean value, over time, of the mass of air which passes through the specified airway cross-section per unit of time

3.13

inlet volume flow rate

q_v1

mass flow rate at the inlet divided by the corresponding mean value, over time, of the average density at the inlet

3.14

fan work per unit mass

W_m

increase in mechanical energy per unit mass of fluid passing through the fan

3.15

compressibility coefficient

k_p

ratio of the mechanical work done by the fan on the air to the work that would be done on an incompressible fluid with the same mass flow, inlet density and pressure ratio

3.16

fan air power

P_u

conventional output power which is the product of the mass flow rate and the fan work per unit mass, or the product of the inlet volume flow rate, the compressibility coefficient and the fan pressure

3.17

fan static air power

P_us

conventional output power which is the product of the mass flow rate and the fan work per unit mass, or the product of the inlet volume flow rate, the compressibility coefficient and the fan pressure

3.18

impeller power

P_r

mechanical power supplied to the fan impeller

[SOURCE: ISO 5801:2017, 3.45]

3.19

fan shaft power

P_a

mechanical power supplied to the fan shaft

[SOURCE: ISO 5801:2017, 3.46, modified — Note 1 to entry was deleted.]

3.20

motor output power

P_o

shaft power output of the motor or other prime mover

[SOURCE: ISO 5801:2017, 3.47]

3.21

motor input power

P_e

electrical input power supplied at the terminals of an electric motor drive without a variable speed drive

[SOURCE: ISO 5801:2017, 3.48]

3.22

drive/control electrical input power

P_ed

power supplied by electrical mains or equivalent energy supply to a motor system

3.23

fan impeller efficiency

η_r

fan air power divided by the impeller power

[SOURCE: ISO 5801:2017, 3.50, modified — References to quantities and formula deleted.]

3.24

fan shaft efficiency

η_a

fan air power divided by the fan shaft power

[SOURCE: ISO 5801:2017, 3.51, modified — References to quantities and formula deleted.]

3.25

overall efficiency for a fan without a variable speed drive

η_e

fan air power divided by the motor input power for the fan and motor without a variable speed drive

Note 1 to entry: The efficiency should be referred to the installation category, see Figure 2 and ISO 13349.

Note 2 to entry: For the purposes of this document efficiency should be expressed as a proportion of unity. To obtain a percentage value multiply the efficiency result by 100.

Note 3 to entry: The motor input power as defined in 3.21.

3.26

overall efficiency for a fan with a variable speed drive

η_ed

fan air power divided by the motor input power for the fan and motor combination with a variable speed drive

Note 1 to entry: The efficiency should be referred to the installation category, see Figure 2 and ISO 13349.

Note 2 to entry: For the purposes of this document efficiency should be expressed as a proportion of unity. To obtain a percentage value multiply the efficiency result by 100.

Note 3 to entry: The motor input power as defined in 3.22.

3.27

overall static efficiency for a fan without a variable speed drive

η_es

fan static air power divided by the motor input power for the fan and motor without a variable speed drive

3.28

overall static efficiency for a fan with a variable speed drive

η_esd

fan static air power divided by the motor input power for the fan and motor combination with a variable speed drive

3.29

optimum efficiency

η_opt

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

3.30

fan motor efficiency grade

FMEG

efficiency grade for a driven fan

Note 1 to entry: The definitions given in 3.25 to 3.28 shall apply.