The cooling unit for the closed box

The use of computers under bad conditions, like, in factories with dusts or bad gases, near coast where damages from sea winds are exist, or outdoors, is discussed. In those places, because of such bad conditions, computers can be used only in clean rooms. A closed box which protects computers or other electric equipment from bad conditions was constructed. To use closed boxes, it is important to cool the equipment in the closed box without air intake. A cooling unit was made to cool the equipment, which a set of heat pipe heat exchangers and a tandem-type scirocco fan are set which transports the heat from the closed box to outer air with heat-pipes. To get high efficiency of heat transfer, heat pipes with fine fins are used.