Help 220V Cooling Fan measure radiation

1) "220V 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 "220V Cooling Fan" temperature difference between the radiator and the surrounding environment.
3) increase the "220V Cooling Fan" surface area of the radiator.