A system (10) and method for cooling an external surface (11) of a heat conductive body (12) heated by a heat source is provided. The system includes a tank (13) containing an evaporation liquid (14), a conduit (15) suppling the evaporation liquid to the external surface of the body, a controllable supply valve (17) for regulating a flow rate of egress of the evaporation liquid from the tank, and a control unit (18) for controlling operation of the supply valve. The control unit includes a temperature sensor (181) producing a temperature sensor signal representative of the temperature of the body at the predetermined place； and a controller (182) capable of generating control signals for controlling operation of the controllable supply valve to provide a pulsed supply of the evaporation liquid to the external surface of the body for obtaining a desired temperature decrease of the body.
