Test and Development Program for Closed-Cycle OTEC Heat Exchangers

Hillis, D.L.; Thomas, A.

doi:10.1109/oceans.1981.1151467

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实验研究1

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2009

2013

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Cited by 2 publications

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“…近年来, 具有微纳米强化表面的板式蒸发器也引起了研究的广泛关注. Hillis 和 Thomas [49] 在 Hawaii 的海洋热能转化系统(OTEC)中, 测试了覆有林德公司高通量表面的板式换热器. 采用氨水作为制冷剂, 实验发现在热流密度为 26 kW/m 2 时, 板的沸腾换热系数达到 30 kW m 2 K 1 , 比光滑平面提高了近 5 倍.…”

Section: 实验研究unclassified

全焊接板式换热器发展综述

朱¹,

王²,

陶³

et al. 2013

Sci. Sin.-Tech.

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Section: 实验研究unclassified

全焊接板式换热器发展综述

朱¹,

王²,

陶³

et al. 2013

Sci. Sin.-Tech.

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The Use of a Nano- and Microporous Surface Layer to Enhance Boiling in a Plate Heat Exchanger

Furberg

Palm

et al. 2009

Journal of Heat Transfer

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Presented research is an experimental study of the performance of a standard plate heat exchanger evaporator, both with and without a novel nano- and microporous copper structure, used to enhance the boiling heat transfer mechanism in the refrigerant channel. Various distance frames in the refrigerant channel were also employed to study the influence of the refrigerant mass flux on two-phase flow heat transfer. The tests were conducted at heat fluxes ranging between 4.5 kW/m2 and 17 kW/m2 with 134a as refrigerant. Pool boiling tests of the enhancement structure, under similar conditions and at various surface inclination angles, were also performed for reasons of comparison. The plate heat exchanger with the enhancement structure displayed up to ten times enhanced heat transfer coefficient in the refrigerant channel, resulting in an improvement in the overall heat transfer coefficient with over 100%. This significant boiling enhancement is in agreement with previous pool boiling experiments and confirms that the enhancement structure may be used to enhance the performance of plate heat exchangers. A simple superposition model was used to evaluate the results, and it was found that, primarily, the convective boiling mechanism was affected by the distance frames in the standard heat exchanger. On the other hand, with the enhanced boiling structure, variations in hydraulic diameter in the refrigerant channel caused a significant change in the nucleate boiling mechanism, which accounted for the largest effect on the heat transfer performance.

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Test and Development Program for Closed-Cycle OTEC Heat Exchangers

Cited by 2 publications

References 6 publications

全焊接板式换热器发展综述

全焊接板式换热器发展综述

The Use of a Nano- and Microporous Surface Layer to Enhance Boiling in a Plate Heat Exchanger

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