R87T-A4A15HP Omron, R87T-A4A15HP Datasheet - Page 13
![TUBE AXIAL FAN](/photos/31/54/315491/r87t-a1a15mp_sml.jpg)
R87T-A4A15HP
Manufacturer Part Number
R87T-A4A15HP
Description
TUBE AXIAL FAN
Manufacturer
Omron
Series
R87Tr
Type
AC Fanr
Specifications of R87T-A4A15HP
Fan Type
Tubeaxial
Size / Dimension
Square - 120mm L x 120mm H x 38mm W
Voltage Rating
200VAC
Power (watts)
18W
Rpm
3100 RPM
Noise
46 dB
Static Pressure
0.236 in H2O (58.8 Pa)
Air Flow
106.0 CFM (3.00m³/min)
Termination
2 Terminals
Bearing Type
Ball
Weight
1.3 lbs (589.7g)
Termination Style
46 dB
Bearings
Ball
Noise Level
42/46dB
Housing Material
Aluminum Die Cast
Power Rating
20/18W
Product Length (mm)
120mm
Product Height (mm)
38mm
Product Depth (mm)
120mm
Line Current
0.13/0.11A
Operating Temp Range
-30C to 70C
Fan Rotation
Clockwise
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
R87TA4A15HP
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