New fan principle: mini blades fan the air
If the fan noise of his PC doesn't bother you, US researchers now want to remedy the situation. They develop motorless fan coolers that are moved back and forth by piezos and silently fan the warm air away.
The principle of piezoelectric fans dates back to 1970, but was not put into practice at that time due to the high volume . Now researchers at Purdue University have taken up the principle and developed it further. The fan cooler should consume very little energy, the researchers speak of 2 milliwatts compared to 300 milliwatts for conventional electric fans. In tests with a notebook, the temperature inside the device with the fan coolers could be reduced by 8 degrees. The next planned step is the further miniaturization to a blade size of 100 µ, then the fans could be installed directly on the circuits of the chips.