Improvement on Heat Release Performance of Direct-contact Heat Exchanger Using Phase Change Material for Recovery of Low Temperature Exhaust Heat
Improvement on Heat Release Performance of Direct-contact Heat Exchanger Using Phase Change Material for Recovery of Low Temperature Exhaust Heat
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DOI：
10.2355/isijinternational.55.441
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发表时间：
2015-01-01
影响因子：
1.8
通讯作者：
Akiyama, Tomohiro
中科院分区：
文献类型：
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作者：
Nomura, Takahiro;Tsubota, Masakatsu;Akiyama, Tomohiro
相变材料相变储热是一种很有前途的炼钢余热利用方法。本研究的目的是改善直接接触式热交换器的放热性能，使用PCM和导热油（HTO）。选择糖醇的一种赤藓糖醇（熔点为391 K）作为PCM。采用内径为200 mm、高为1 400 mm的立式不锈钢圆筒作为蓄热单元。将具有18个垂直向下定位的孔的环形注射器放置在HSU的底部。在这个注射器中的每个孔的直径为2.5毫米。我们调查的PCM在HSU的高度，HTO的流量，并在注射喷嘴孔的数量的增加的影响的温度有效性和热交换率作为指标的热释放性能。结果表明，喷嘴孔数的增加促进了HTO在液态相变材料中的均匀分布，防止了HTO漂移和相变材料的逆向凝固，提高了高HTO流量条件下的放热性能。
Latent heat storage using a phase change material (PCM) is a promising method for utilizing the exhaust heat from steelworks. The purpose of this study was to improve the heat release performance of a direct-contact heat exchanger using a PCM and heat transfer oil (HTO). Erythritol (with a melting point of 391 K), which is a kind of sugar alcohol, was selected as a PCM. A vertical stainless steel cylinder with an inner diameter of 200 mm and height of 1 400 mm was used as the heat storage unit (HSU). A ring-shaped injector with 18 holes positioned vertically downward was placed at the bottom of the HSU. Each hole in this injector had a diameter of 2.5 mm. We investigated the effects of the height of the PCM in the HSU, the HTO flow rate, and an increase in the number of injection-nozzle holes on the temperature effectiveness and heat exchange rate as indices of the heat release performances. As results, we found that an increase in the number of nozzle holes accelerated the uniform distribution of the HTO in the liquid PCM, prevented the HTO drift flow and adverse solidification of the PCM, and improved the heat release performance under the condition of a high HTO flow rate.