2 sentences

1. 风扇有助于电脑散热。

   fēng​shàn yǒu​zhù​yú diàn​nǎo sàn​rè.

   The fan helps with the computer's heat dissipation.

   Source: Dong Chinese Dictionary

2. 由于摩擦会产生大量的热，机器需要良好的散热。

   yóu​yú mó​cā huì chǎn​shēng dà​liàng de rè, jī​qì xū​yào liáng​hǎo de sàn​rè.

   Since friction generates a lot of heat, the machine needs good heat dissipation.

   Source: Dong Chinese Dictionary