Development of a Two-Phase Cold Plate

概要

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A two-phase cold plate using evaporators of grooved double-pipe type has been tested in order to examine its heat transfer and hydrodynamic characteristics under practical operating conditions. Under uniform heat load, excellent temperature uniformity of the cold plate was obtained. Under uneven heat load, however, the temperature distributions were not uniform, high at an active area and low at an inactive area. It seems to be due to ineffective liquid flow through inactive pipes, which causes liquid shortage at active tubes and over-cooling by sub-cooled liquid at inactive tubes. Parallel operations with two cold plates were performed successfully demonstrating that the both temperatures were kept at the same level even under different heat loads. In a certain operating condition, individual flow rate of the two cold plates was observed to oscillate symmetrically to each other, while total flow rate was kept constant and no anomalous behavior on heat transfer was induced. Through the tests, a design approach for the cold plate from the viewpoint of a loop control technology was obtained.
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