1) "220V AC Cooling Fan" rougher surface heat, heat radiation is also stronger. Usually heating components should be coated with an outer casing shielding paint, painted surfaces of the fins rough black or colored paint; heat-sensitive components, often made of bright white surface in order to reduce the absorption of radiant heat.
2) increase the temperature difference between the radiator and the surrounding environment.
3) increase the "220V AC Cooling Fan" surface area of the radiator.
These three methods of heat transfer are often co-exist, the heat transfer is multidimensional. Under specific conditions can ignore minor factors to simplify calculations. For example, the semiconductor chip to the heat transfer is mainly shell conduction, "220V AC Cooling Fan" and conduction, convection and radiation is negligible compared, and if at high altitude conditions, convection in a secondary position, mainly heat conduction and radiation, and so on.