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Noctua NF-R8 80mm Quiet Computer Fan
Noctua NF-R8 80mm Quiet Case Fan
The NF-R8 is the first fan employing a novel 80mm rotor which was developed by the Austrian Institute for Heat-Transmission and Fan Technology
(Österreichisches Institut für Wärmeübertragung und Ventilatorentechnik, ÖIWV). Thanks to the special optimisation of the blade geometry towards ultra low
noise application, the NF-R8 is up to 10% more quiet than current high-end fans at the same flow rate.
Self-stabilising oil-pressure bearing (SSO bearing): The NF-R8 series are equipped with a magnetically centred, self lubricating oil-pressure bearing that
provides a new level of quietness and long-term stability.
Specs: 1800 RPM 17 dB(A) @ 22 CFM
Size 80x80x25 mm
Bearing SSO-Bearing
Blade Geometry Raised-Blade-Design
Rotational Speed (+/- 10%) 1800 RPM
Rotational Speed with L.N.A. (+/- 10%) 1300 RPM
Rotational Speed with U.L.N.A. (+/- 10%) 800 RPM
Airflow 53 m³/h
Airflow with L.N.A. 39 m³/h
Airflow with U.L.N.A. 26 m³/h
Acoustical Noise 17 dB(A)
Acoustical Noise with L.N.A. 10 dB(A)
Acoustical Noise with U.L.N.A. 7* dB(A)
Input Power 1,32 W
Input Current 0,11 A
Voltage Range 4-13 V
MTBF > 150.000 h
Scope of Delivery Ultra-Low-Noise Adaptor (U.L.N.A.)
Low-Noise Adaptor (L.N.A.)
4 Vibration Compensators
3:4-Pin Adaptor
4 Fan Screws
Warranty 6 years
About Noctua Raised Blade Desighn
Current silent fans frequently employ conventional blade geometries, which were developed for higher speed ranges and significantly lose efficiency at lower
rotation speeds. The Noctua Raised-Blade-Design of the NF-R8 series was developed by the Austrian Institute for Heat-Transmission and Fan Technology
(Österreichisches Institut für Wärmeübertragung und Ventilatorentechnik, ÖIWV) and specifically tailored to 80mm fans with extremely low rotation speeds.
The result is a performance improvement of up to 10% compared to conventional blade geometries.
Both the angle of attack and the design of the blade area of the NF-R8 rotor are optimised for maximum airflow and minimum noise emission at speed ranges
below 1800RPM. Raising the leading edge above the rotor hub and lowering the trailing edge below the bottom of the rotor hub results in an extended profile
chord length, which compensates for the reduction in blade surface caused by the steeper angle of attack and hence increases the overall blade force. The
continuous radial increase of the blade curvature towards the blade tips ensures sufficient static pressure despite of the slow rotation speeds. A significant
reduction in noise emission is achieved through the rounding of the fan blades towards the rotor hub as well as the rounding of the rotor hub itself. This way,
the NF-R8 is significantly more quiet than other high end silent fans at the same performance thanks to its specific optimisations for ultra low noise
application.
Mag. Manfred Stadler MBA of the Austrian Institute for Heat-Transmission and Fan Technology (Österreichisches Institut für Wärmeübertragung und
Ventilatorentechnik, ÖIWV) about the development of the Noctua Raised-Blade and Straight-Blade-Designs:
"In the area of PC cooling, the last years saw a growing demand for axial fans with the lowest possible noise emission, which manufacturers mostly met by
simply reducing the RPM of existing models without sufficiently adapting the blade geometry and profile to the modified fluid dynamic parameters. The
comparison of measured data and simulation outputs showed that the result was an average deficit of efficiency of 10-15%. The complete redevelopment of
the blade geometry and profile was carried out with exact fluid mechanical adjustment to minimal noise emission in a speed range of 400-1800RPM at a
height of 25mm and a radius of 40 and 60mm. Both fan blades possess 8-12% more flow rate than comparable products at the same total noise emission
and static pressure." (Mag. Manfred Stadler MBA, Austrian Institute for Heat-Transmission and Fan Technology (Österreichisches Institut für
Wärmeübertragung und Ventilatorentechnik, ÖIWV))
SSO-Bearing
Thanks to an optimised principle of operation, the self-stabilising oil-pressure bearing (SSO bearing) of the Noctua NF-S12 and NF-R8 series surpasses
current types of ball, sleeve or liquid bearings in terms of long-term stability and quietness.
SSO Prinicipale Of Operation
The rotary motion of the axis generates pressure upon the special oil enclosed within the bearing. This causes the build-up of a dynamic pressure field that
centres and stabilises the axis within the bearing shell. While conventional liquid bearings employ the principle of hydrodynamic pressure too, the SSO
bearing is equipped with an additional magnet that supports the self-stabilisation of the rotor axis. This allows for a faster, more precise and more reliable
centring of the rotor axis and thus increases the long-term stability and quietness of the bearing: When the fan starts, the dynamic pressure field of the liquid
bearing needs to build up first, which results in an initial precession of the axis, the so called gyro effect. This amounts to an increased abrasion until the axis
is stabilised through the build-up of the dynamic pressure field, which may by and by lead to increased noise emission and bearing defects. Because of this,
the SSO bearing possesses a built in magnet, whose field ensures the immediate self-stabilisation of the rotor and hence reduces the gyro effect. In addition
to the stabilisation during the start-up phase of the fan, the supporting magnet allows for a more exact centring of the axis within the bearing shell and thus
further reduces bearing resistance, abrasion and noise emission. SSO-Bearings When Compared To Traditional Sleeve And Ball Bearing The sleeve and
ball bearings currently predominating the fan market exhibit major drawbacks: While conventional sleeve bearings initially have very low noise emissions,
they mostly possess unsatisfying long-term stability, which leads to a short overall lifespan and increasing noise after longer operating times. High grade ball
bearings, on the other hand, while providing satisfying long-term stability operate at slightly higher noise levels from the beginning. The SSO bearing not
only surpasses the quietness of conventional sleeve bearings but also the long-term stability of current top-of-the-line ball bearings.
The NF-R8 is the first fan employing a novel 80mm rotor which was developed by the Austrian Institute for Heat-Transmission and Fan Technology
(Österreichisches Institut für Wärmeübertragung und Ventilatorentechnik, ÖIWV). Thanks to the special optimisation of the blade geometry towards ultra low
noise application, the NF-R8 is up to 10% more quiet than current high-end fans at the same flow rate.
Self-stabilising oil-pressure bearing (SSO bearing): The NF-R8 series are equipped with a magnetically centred, self lubricating oil-pressure bearing that
provides a new level of quietness and long-term stability.
Specs: 1800 RPM 17 dB(A) @ 22 CFM
Size 80x80x25 mm
Bearing SSO-Bearing
Blade Geometry Raised-Blade-Design
Rotational Speed (+/- 10%) 1800 RPM
Rotational Speed with L.N.A. (+/- 10%) 1300 RPM
Rotational Speed with U.L.N.A. (+/- 10%) 800 RPM
Airflow 53 m³/h
Airflow with L.N.A. 39 m³/h
Airflow with U.L.N.A. 26 m³/h
Acoustical Noise 17 dB(A)
Acoustical Noise with L.N.A. 10 dB(A)
Acoustical Noise with U.L.N.A. 7* dB(A)
Input Power 1,32 W
Input Current 0,11 A
Voltage Range 4-13 V
MTBF > 150.000 h
Scope of Delivery Ultra-Low-Noise Adaptor (U.L.N.A.)
Low-Noise Adaptor (L.N.A.)
4 Vibration Compensators
3:4-Pin Adaptor
4 Fan Screws
Warranty 6 years
About Noctua Raised Blade Desighn
Current silent fans frequently employ conventional blade geometries, which were developed for higher speed ranges and significantly lose efficiency at lower
rotation speeds. The Noctua Raised-Blade-Design of the NF-R8 series was developed by the Austrian Institute for Heat-Transmission and Fan Technology
(Österreichisches Institut für Wärmeübertragung und Ventilatorentechnik, ÖIWV) and specifically tailored to 80mm fans with extremely low rotation speeds.
The result is a performance improvement of up to 10% compared to conventional blade geometries.
Both the angle of attack and the design of the blade area of the NF-R8 rotor are optimised for maximum airflow and minimum noise emission at speed ranges
below 1800RPM. Raising the leading edge above the rotor hub and lowering the trailing edge below the bottom of the rotor hub results in an extended profile
chord length, which compensates for the reduction in blade surface caused by the steeper angle of attack and hence increases the overall blade force. The
continuous radial increase of the blade curvature towards the blade tips ensures sufficient static pressure despite of the slow rotation speeds. A significant
reduction in noise emission is achieved through the rounding of the fan blades towards the rotor hub as well as the rounding of the rotor hub itself. This way,
the NF-R8 is significantly more quiet than other high end silent fans at the same performance thanks to its specific optimisations for ultra low noise
application.
Mag. Manfred Stadler MBA of the Austrian Institute for Heat-Transmission and Fan Technology (Österreichisches Institut für Wärmeübertragung und
Ventilatorentechnik, ÖIWV) about the development of the Noctua Raised-Blade and Straight-Blade-Designs:
"In the area of PC cooling, the last years saw a growing demand for axial fans with the lowest possible noise emission, which manufacturers mostly met by
simply reducing the RPM of existing models without sufficiently adapting the blade geometry and profile to the modified fluid dynamic parameters. The
comparison of measured data and simulation outputs showed that the result was an average deficit of efficiency of 10-15%. The complete redevelopment of
the blade geometry and profile was carried out with exact fluid mechanical adjustment to minimal noise emission in a speed range of 400-1800RPM at a
height of 25mm and a radius of 40 and 60mm. Both fan blades possess 8-12% more flow rate than comparable products at the same total noise emission
and static pressure." (Mag. Manfred Stadler MBA, Austrian Institute for Heat-Transmission and Fan Technology (Österreichisches Institut für
Wärmeübertragung und Ventilatorentechnik, ÖIWV))
SSO-Bearing
Thanks to an optimised principle of operation, the self-stabilising oil-pressure bearing (SSO bearing) of the Noctua NF-S12 and NF-R8 series surpasses
current types of ball, sleeve or liquid bearings in terms of long-term stability and quietness.
SSO Prinicipale Of Operation
The rotary motion of the axis generates pressure upon the special oil enclosed within the bearing. This causes the build-up of a dynamic pressure field that
centres and stabilises the axis within the bearing shell. While conventional liquid bearings employ the principle of hydrodynamic pressure too, the SSO
bearing is equipped with an additional magnet that supports the self-stabilisation of the rotor axis. This allows for a faster, more precise and more reliable
centring of the rotor axis and thus increases the long-term stability and quietness of the bearing: When the fan starts, the dynamic pressure field of the liquid
bearing needs to build up first, which results in an initial precession of the axis, the so called gyro effect. This amounts to an increased abrasion until the axis
is stabilised through the build-up of the dynamic pressure field, which may by and by lead to increased noise emission and bearing defects. Because of this,
the SSO bearing possesses a built in magnet, whose field ensures the immediate self-stabilisation of the rotor and hence reduces the gyro effect. In addition
to the stabilisation during the start-up phase of the fan, the supporting magnet allows for a more exact centring of the axis within the bearing shell and thus
further reduces bearing resistance, abrasion and noise emission. SSO-Bearings When Compared To Traditional Sleeve And Ball Bearing The sleeve and
ball bearings currently predominating the fan market exhibit major drawbacks: While conventional sleeve bearings initially have very low noise emissions,
they mostly possess unsatisfying long-term stability, which leads to a short overall lifespan and increasing noise after longer operating times. High grade ball
bearings, on the other hand, while providing satisfying long-term stability operate at slightly higher noise levels from the beginning. The SSO bearing not
only surpasses the quietness of conventional sleeve bearings but also the long-term stability of current top-of-the-line ball bearings.
