ill try to explain this to the best of my ability heat energy cannot be destroyed under the law of conservation of energy, heat = enegery and it cannot be destroyed by an means however it can be transfered somewhere else into another form. The heat radiates off the hot computer parts and the liquids natural reaction is to absorb the watter and get hotter and hotter until it evaporates, from here it rises up because hot air rises, more heat increases volume, and indirectly decreases the density and the less dense warm air rises to the cool area, a tank that is super cold and the energy is trasfer back to cold water or whatever liquid is used and flows back down the pipe to absorb more heat
