Thermal considerations
The thermal effects of the Strato Pi Fan are affected by several factors, including the
external environment conditions, the enclosure, and the CPU and electrical loads.
In general terms, the fan will significantly increase the airflow inside the enclosure, and
improve heat transfer away from the CPU and the other nearby components on the
Raspberry Pi board.
The CPU will run cooler than without Strato Pi Fan, and it will take longer and higher loads
to reach its throttling limits.
Under ideal conditions, Strato Pi Fan may reduce both the CPU temperature and the
average air temperature inside a relatively small enclosure by up to 15 °C.
The following charts show measured temperatures in a standard 4 units DIN-rail
enclosure, with Strato Pi Fan fitted between the Raspberry Pi 4B and a Iono Pi board. This
configuration also takes into account the heat generated by the Iono Pi board voltage
regulator. The unit under test was installed in a small DIN-rail cabinet.
DIN-RAIL ENCLOSURE - 20C AMBIENT TEMPERATURE - LOW CPU LOAD
With an air temperature around the enclosure of 20 °C, the air temperature inside the
enclosure, as measured by the LM75 sensor on the Strato Pi Fan board, would be around
45 to 50 °C with a low CPU load. With the fan running, this temperature drops to
approximately 33 °C. The CPU temperature, measured by its internal sensor, also drops
by 15 °C, and remains stable at 40 °C.
12
Strato Pi Fan User Guide
FAN ON
FAN OFF
FAN ON
