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Fans

CPU Fan

The CPU Fan in the Pironman 5 is managed by the Raspberry Pi system and forms the cornerstone of its smart cooling solution, especially under heavy loads. This system combines a primary CPU Fan with two supplementary GPIO Fans for enhanced cooling performance, closely integrated with the Raspberry Pi 5’s thermal management system.

../../_images/fan_tower_cooler.png

Electrical Characteristics

  • Rated Voltage: 5 VDC

  • Starting Voltage: 4.0 V (at 25°C Power ON/OFF)

  • Operating Voltage Range: 4.0 ~ 5.5 VDC

  • Rated Current: 0.05 A / MAX. 0.08 A

  • Rated Power: 0.25 W / MAX. 0.40 W

  • Rated Speed: 3500±10% RPM (at 25°C, tested after 3 minutes of operation)

  • Maximum Airflow: 2.46 (MIN. 2.21) CFM (at zero static pressure)

  • Maximum Static Pressure: 0.62 (MIN. 0.496) mmH2O (at zero airflow)

  • Acoustical Noise: 22.31 dB(A) MAX. 25.31 dB(A)

  • Life Expectancy: 40,000 hours (at 25°C, 65% humidity, normal room conditions)

Mechanical Characteristics

  • Dimensions: 40x10.4x40 mm (LxWxH)

  • Frame Material: PBT Plastic

  • Impeller Material: PBT Plastic

  • Bearing Type: Hydraulic Bearing

Environmental Parameters

  • Operating Temperature: -10°C ~ 70°C

  • Storage Temperature: -40°C ~ 75°C

  • Operating Humidity: 5% ~ 90% RH

  • Storage Humidity: 5% ~ 95% RH

Fan Speed Control Based on Temperature

The CPU Fan operates dynamically, adjusting its speed according to the Raspberry Pi 5’s temperature:

  • Below 50°C: Fan remains off (0% speed).

  • At 50°C: Fan operates at low speed (30% speed).

  • At 60°C: Fan increases to medium speed (50% speed).

  • At 67.5°C: Fan ramps up to high speed (70% speed).

  • At 75°C and above: Fan operates at full speed (100% speed).

This temperature-to-speed control includes a 5°C hysteresis to prevent frequent speed changes. For instance, the fan will reduce its speed only after the temperature drops 5°C below each threshold.

The following commands allow users to monitor the CPU Fan’s operation:

To check the fan’s current state:

cat /sys/class/thermal/cooling_device0/cur_state

GPIO Fans

../../_images/size_fan.png

  • Extermal dimension: 40*40*10MM

  • Weight: 13.5±5g/pcs

  • Life: 40,000 hours (room temperature 25°C)

  • Maximum Air Flow: 2.46CFM

  • Max.Air Pressure: 0.62mm-H2O

  • Accoustic Sound: 22.31dBA

  • Rated Input power: 5V/0.1A

  • Rated Speed: 3500±10%RPM

  • Operating Temperature: -10℃~+70℃

  • Storage Temperature: -30℃~+85℃