Two phase component cooler

A two-phase cooling device for cooling a heat dissipating component, the device operating over a temperature range comprising a low range and high range and comprising:

• an evaporator unit;
• a condenser unit;
• a liquid coolant disposed within the device, the liquid coolant having a sufficiently low boiling point that the liquid coolant boils to a vapor by the heat dissipated from the component in both the low range and the high range;
• a first conduit connecting the evaporator unit and the condenser unit to allow the vapor to flow from the evaporator unit to the condenser unit wherein the vapor condenses to a condensate;
• a second conduit connecting the evaporator unit and the condenser unit to allow the condensate to flow from the condenser unit to the evaporator unit, the evaporator unit, the condenser unit, the first conduit and the second conduit all forming a hermetic enclosure with an internal pressure which is partially filled with a noncondensing gas which is soluble with said liquid coolant;
• wherein the enclosure comprises at least one wall having limited flexibility which results in the internal pressure remaining substantially at the ambient pressure over said low range of the device and being at pressures significantly higher than ambient pressure in the high range.