R87F-A3A15HP Omron, R87F-A3A15HP Datasheet - Page 13

• Manufacturer Part Number: R87F-A3A15HP
• Description: TUBE AXIAL FAN
• Manufacturer: Omron
• Series: R87Fr

Specifications of R87F-A3A15HP

• Fan Type: Tubeaxial
• Size / Dimension: Square - 120mm L x 120mm H x 38mm W
• Voltage Rating: 115VAC
• Power (watts): 15W
• Rpm: 2750 RPM
• Noise: 42 dB
• Static Pressure: 0.374 in H2O (93.1 Pa)
• Air Flow: 95.3 CFM (2.70m³/min)
• Termination: 2 Terminals
• Bearing Type: Ball
• Weight: 1.2 lbs (544.3g)
• Termination Style: 42 dB
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: R87FA3A15HP

Selecting a Fan
Procedure
1. Estimate the amount of heat generated (W) inside the Unit.
2. Set the maximum permitted temperature rise limit (
3. Calculate the required flow rate.
4. Estimate the system impedance from the air flow through the Unit
5. Select the Fan according to the P - Q characteristics.
6. Measure the temperature rise in an installed Unit.
7. Reappraise the Fan if the measured cooling effect is insufficient.
The procedure to select a Fan is described above. It is difficult,
however, to obtain the actual system impedance.
In general, therefore, select a Fan with a maximum flow rate of from
1.3 to 2 times the flow rate required.
As a rough guide, 1.3 times for a small system impedance, 1.5 times
for medium, and 2 times for large.
Reconsider the Fan if the cooling effect is insufficient after the
selected fan has been installed in the Unit and the temperature rise
has been measured.
Q =
∆
Unit.
or from previous data.
P = KQ
50 W
∆
T
n
m
T1: Temperature of the inlet air (°C).
T2: Temperature of the outlet air (°C).
3
/min
T
1
∆T = T
Q = flow rate (m
∆
∆
K: Unit constant
n: Coefficient determined by air flow
supply
Power
T = permitted temperature rise limit (°C)
P: Pressure drop (Pa)
n=1: laminar flow
n=2: turbulent flow
(n=2 is the normal value.)
2
− T
(Normally between 8 to 10°C.)
W = amount of heat generated (kW)
1
3
/min.)
T
2
∆
T) inside the
Serial and Parallel Fan Operation
The characteristics of two identical Fans operated in series or
parallel are determined as shown in the following diagrams.
Serial Operation:
Parallel Operation:
Noise Measurements
The following two methods are available for measuring Fan noise.
These are used interchangeably by Fan manufacturers so that the
measurement method is not standardized.
OMRON conducts testing according to JIS (Japan Industrial
Standard) C 9603 because of the small size and low noise levels of
the Fans and because of their similarity in shape to extractor fans.
This standard prescribes that the noise be measured at a distance of
1.5 m (A characteristics) from the side of the Fan.
JIS B 8330: Testing and Inspection Methods for Fans
JIS C 9603: Extractor Fans
Safety Precautions for All Axial-flow Fans
P
P
P
2
1
Q
P
2
2
2 units
1 unit
1.5 m
1 unit
1.5P
2Q
Microphone
1
1
2 units
Q
1
Flow rate
increase
Fan
System
impedance
System
impedance
Q
Q
Pressure
increase
2
Flow rate
Flow rate
11