Miniature LHPs

晨怡热管 2008-4-24 0:07:41

Miniature loop heat pipes for cooling high-rate CPUs of mobile "notebook" computers are among the latest developments of the laboratory:

the capacity is 140 W at a thermal resistance of 0.2°C/W;
the total thermal resistance in the system "evaporator wall - ambient air" is at the level of 0.2-0.7°C/W;
the length is 200-300 mm;
the evaporator diameter is 5 mm;
the mass, including the radiator and the "saddle" for the CPU location, does not exceed 50 g;
the evaporator mass is less than 4 g.

There are technical prerequisites for a further decrease in the thermal resistance.

Miniature LHPs

CPU Coolers on the basis of Miniature LHPs

Miniature LHPs for cooling heat-tensioned components of electronic devices and computer equipment

The devices have an evaporator 5mm in diameter with an active-zone length of 20mm. The evaporator is equipped with a copper interface (saddle) for the location of the object to be cooled. The condenser is a smooth-walled pipe with outer aluminum fins. The evaporator is connected to the condenser with a vapor line and a condensate line 2mm in diameter. The inherent mass of a miniature LHP is 9.3g. The total mass of the device including the interface and the fins is about 45g. The device retains efficient serviceability at any position in 1-g conditions.

Technical characteristics

Characteristics	Condenser cooling
Characteristics	air, temperature 22,6°С	water, temperature 45°С
Maximum capacity, W	90	130
Nominal capacity, W	50-70	80-100
Interface temperature at the nominal capacity, °С	70,1	64,6
Inherent thermal resistance at the nominal capacity, °С/W	0,12	0,12
Total thermal resistance "interface - cooling medium" at the nominal capacity, °С/W	0,67	0,20

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