ACMAXX datasheet(13/192 Pages) EBMPAPST

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• Read down from this point to obtain the

required value for the cooling air flow.

The diagram is based on

the following formula:

4. Optimum operating range

The required fan, however, must also be able

to deliver a suitable static pressure increase

Δpf, in order to force the cooling air through

the device. A fan must therefore be selected

that provides the required air flow performance

within its optimum operating range (see also

the air performance curves under technical

data).

5. Fan selection

If the requirements of an application are ful-

filled by more than one fan, the noise level,

space requirements, economy and ambient

conditions will assist in making the final choice.

V· [m3/h]

≈ 3·

Pv [w]

ΔT [K]

Selecting the correct fan

1. Dissipated energy

A large amount of the energy consumed by electrical and electronic

devices is converted into heat. In selecting the correct fan, therefore,

it is important to determine the dissipated energy that must be remo-

ved. The electrical power consumption of the unit to be cooled, often

represents a suitable value for this purpose.

2. Permissible temperature rise

The air flow which the selected fan is required to generate, is deter-

mined by the dissipated energy and the permissible rise (

ΔT) of the

cooling air flow (from entry to exit of the device to be cooled). The

max. allowable

ΔT depends greatly on the temperature sensitivity of

the individual device components.

ΔT = 5K means e.g. that the avera-

ge air flow leaving the device to be cooled may only be 5°C warmer

than the ambient temperature (a large volume of air is required for this

purpose). A lower air flow rate is sufficient if a higher temperature dif-

ference (e.g.

ΔT = 20K), can be tolerated.

3. Required cooling air flow

• In the below diagram a horizontal line is drawn from the dissipated

enery to intersect with the selected

ΔT line.

30 40 50

100

200 300

500

Δ t20K

Δ t15K

Δ t10K

Δ t5K

m³/h

Air Flow

90 m³/h

Example : P v = 300 W att

Δ t = 10 K

100

150

200

300

500

1000

5000

m³/h

CFM

Optimum Operating

Range

0,4

0,8

1,2

1,6

2,0

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