An airstream cooling assembly comprising: an evaporator having an outer surface and containing a primary cooling medium, the evaporator being configured to have a first airstream directed over the outer surface thereof and, when the first airstream is directed over the outer surface, to change the phase of the primary cooling medium from liquid to gas; a first condenser having an outer surface and being coupled to the evaporator, the first condenser being configured to have a second airstream directed over the outer surface thereof, and when the second airstream is directed over the outer surface of the first condenser, to receive the primary cooling medium from the evaporator, transfer heat from the primary cooling medium, and change the phase of the primary cooling medium from gas to liquid; a second condenser coupled to the evaporator and configured to accept a secondary cooling medium (118, 208), and when accepting the secondary cooling medium (118, 208), to receive the primary cooling medium from the evaporator, transfer heat from the primary cooling medium, and change the phase of the primary cooling medium from gas to liquid; and wherein the evaporator and the first condenser are incorporated in an integral heat exchanger configured to operate as heat pipe, wherein the evaporator is configured to receive the primary cooling medium in the liquid phase from at least one of the first condenser and the second condenser, characterised in that a controller configured to selectively supply the secondary cooling medium (118,208) to the second condenser is provided, and in that the evaporator is connected to the second condenser by a line and configured to receive the primary cooling medium in the liquid phase from the second condenser by the line forming a recirculating flow path for the primary cooling medium. an evaporator having an outer surface and containing a primary cooling medium, the evaporator being configured to have a first airstream directed over the outer surface thereof and, when the first airstream is directed over the outer surface, to change the phase of the primary cooling medium from liquid to gas; a first condenser having an outer surface and being coupled to the evaporator, the first condenser being configured to have a second airstream directed over the outer surface thereof, and when the second airstream is directed over the outer surface of the first condenser, to receive the primary cooling medium from the evaporator, transfer heat from the primary cooling medium, and change the phase of the primary cooling medium from gas to liquid; a second condenser coupled to the evaporator and configured to accept a secondary cooling medium (118, 208), and when accepting the secondary cooling medium (118, 208), to receive the primary cooling medium from the evaporator, transfer heat from the primary cooling medium, and change the phase of the primary cooling medium from gas to liquid; and wherein the evaporator and the first condenser are incorporated in an integral heat exchanger configured to operate as heat pipe, wherein the evaporator is configured to receive the primary cooling medium in the liquid phase from at least one of the first condenser and the second condenser, characterised in that