Variable heat conductance heat exchanger

Heat exchange – Movable heating or cooling surface – Rotary drum

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Details

16510419, 62333, F28F 2700, F28D 1500

Patent

active

048586781

ABSTRACT:
A heat exchanger having a variable thermal conductance is disclosed. The thermal conductance varies according to the absolute and relative temperatures between a high-temperature wall and a low-temperature wall. The heat exchanger includes an interior volume having a heat transfer medium therein. Fins extend from the low-temperature wall of the heat exchanger into the interior volume. The heat transfer medium in the fluid phase circulates over the fin surface area to transfer heat by convection and conduction from the high-temperature wall to the low-temperature wall. In the event the temperature of the heat transfer medium decreases, such as by a drop in the temperature of the low-temperature wall or by a decrease in heat flowing through the heat exchanger, a portion of the heat transfer fluid solidifies or freezes, which reduces the effective fin surface area and the circulation area. This reduces the thermal conductance of the heat exchanger. The heat transfer medium is selected based on the requirements of the heat transfer system. The fin configruation, the number of fins, their respective surface areas, and the distance of the fin tip to the high-temperature wall are also selected based on the system heat transfer requirements.

REFERENCES:
patent: 1921147 (1933-08-01), Baird
patent: 2044609 (1936-06-01), Hedlund
patent: 2499736 (1950-03-01), Kleen
patent: 2829271 (1958-04-01), Boucher
patent: 2990693 (1961-07-01), Houplein
patent: 3985182 (1976-10-01), Hara et al.
patent: 4137964 (1979-02-01), Buckley
"SuperfluidTurbulence", Scientific American, Nov. 1988, pp. 100-108, by Donnelly.

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