Abstract: A thermal module includes an evaporator, a metal pipe, a main frame, a heat sink, a wick and a cooling liquid. The evaporator is in touch with a heat source and has a gas outlet and a liquid inlet. Two ends of the metal pipe connect separately with the gas outlet and the liquid inlet of the evaporator to from a closed loop. The metal pipe includes a vapor pipe, a condenser and a liquid pipe. The main frame connects with the wall of the metal pipe near the gas outlet. The heat sink is outside the condenser. The wick is positioned in an inner wall of the evaporator and in the gas outlet. The cooling liquid is in the closed loop.

Abstract: A heat dissipation device includes a hollow housing and a speaker. The hollow housing has a first opening and a second opening. The speaker is disposed at the first opening, wherein the speaker includes a diaphragm oscillating within a frequency scope the human ear cannot or hardly hear so as to generate airflow through the second opening.