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Proceedings of Symposium on Energy Engineering in the 21<sup>st</sup> Century (SEE2000) Volume I-IV

ISSN:
1-56700-132-7 (Print)

OPTIMAL DESIGN OF MICRO BARE-TUBE HEAT EXCHANGER

Sawat Paitoonsurikarn
Department of Mechanical Engineering, The University of Tokyo Hongo 7-3-1, Bunkyo-ku, Tokyo, 113-8656, Japan

Nobuhide Kasagi
Center for Research and Development Strategy, Japan Science and Technology Agency; Department of Mechanical Engineering, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan

Yuji Suzuki
Department of Mechanical Engineering, The University of Tokyo Hongo, Bunkyo-ku, Tokyo 113-8656, Japan

Abstract

An optimum design tool based on the simulated annealing technique has been developed for a compact heat exchanger that employs only small diameter tubes without conventional fins, and the performance achieved by the present design is compared to commercially available compact heat exchangers. For all design problems tested, the present heat exchanger design offers a significant degree of improvement in terms of the pumping power, the heat transmission efficiency, and/or the core volume size. The range of tube diameter in the optimum design is found to be 0.3-0.5 mm. Laboratory experiments with a prototype heat exchanger with 0.5 mm OD bare tubes confirm the numerical results.