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A heat pipe loop includes a first heat pipe section having a first temperature and a second heat pipe section having a second temperature higher than the first temperature. The first heat pipe section is a condenser and the second heat pipe section is an evaporator. A vapor line connects an upper po

A heat pipe loop includes a first heat pipe section having a first temperature and a second heat pipe section having a second temperature higher than the first temperature. The first heat pipe section is a condenser and the second heat pipe section is an evaporator. A vapor line connects an upper portion of the first heat pipe section with an upper portion of the second heat pipe section. A liquid line connects a lower portion of the first heat pipe section with a lower portion of the second heat pipe section. In one embodiment, the first heat pipe section is disposed at a first elevation and the second heat pipe section is disposed at a second elevation higher than the first elevation. A pump directs liquid from the first heat pipe section to the second heat pipe section through the liquid line.

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1. A heat pipe loop comprising: a first heat pipe section having a first temperature and having a first plurality of tubes; a second heat pipe section having a second temperature higher than the first temperature and having a second plurality of tubes; a vapor line connecting an upper portio

1. A heat pipe loop comprising: a first heat pipe section having a first temperature and having a first plurality of tubes; a second heat pipe section having a second temperature higher than the first temperature and having a second plurality of tubes; a vapor line connecting an upper portion of the first heat pipe section with an upper portion of the second heat pipe section; a liquid line connecting a lower portion of the first heat pipe section with a lower portion of the second heat pipe section; a pump which pumps liquid from the first heat pipe section to the second heat pipe section through the liquid line; and a liquid distributor intermediate the pump and the second heat pipe section which sprays the liquid to wet an inside surface of each of the second plurality of tubes. 2. The heat pipe loop of claim 1 in which the first heat pipe section is a condenser and the second heat pipe section is an evaporator.3. The heat pipe loop of claim 1 in which the first heat pipe section is disposed at a first elevation and the second heat pipe section is disposed at a second elevation higher than the first elevation.4. The heat pipe loop of claim 1 in which the liquid distributor sprays the liquid from an tipper portion of the second plurality of tubes.5. The heat pipe loop of claim 4 further comprising: a liquid return line intermediate a lower portion of the second plurality of tubes and an inlet of the pump. 6. The heat pipe loop of claim 4 in which the liquid distributor comprises a perforated pipe disposed coaxially within the vapor line.7. The heat pipe loop of claim 1 in which the liquid distributor sprays the liquid from a lower portion of the second plurality of tubes.8. The heat pipe loop of claim 7 in which the liquid distributor comprises a perforated pipe disposed coaxially within the liquid line.9. The heat pipe loop of claim 1 in which the first plurality of tubes are disposed substantially vertically; and the second plurality of tubes are disposed substantially vertically. 10. The heat pipe loop of claim 1 in which the first plurality of tubes are disposed substantially horizontally; and the second plurality of tubes are disposed substantially horizontally. 11. The heat pipe loop of claim 1 in which the second temperature is less than about 5° F. higher than the first temperature.12. A heat pipe loop comprising: a first heat pipe section having a first plurality of tubes; a second heat pipe section having a second plurality of tubes; a vapor line connecting an upper portion of the first heat pipe section with an upper portion of the second heat pipe section; a liquid line connecting a lower portion of the first heat pipe section with a lower portion of the second heat pipe section; a first pump which pumps liquid from one heat pipe section to the other heat pipe section through the liquid line; and a liquid distributor intermediate the pump and the second heat pipe section which sprays the liquid to wet an inside surface of each of the second plurality of tubes. 13. The heat pipe loop of claim 12 in which the liquid distributor is disposed coaxially within the vapor line.