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首页> 外文期刊>Energy Equipment and Systems >Experimental study of nanofluid effects on heat transfer in closed cycle system in shell and tube heat exchangers at Isfahan power plant
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Experimental study of nanofluid effects on heat transfer in closed cycle system in shell and tube heat exchangers at Isfahan power plant

机译：伊斯法罕发电厂管壳式热交换器闭环系统中纳米流体对传热影响的实验研究

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The present study investigated the effect of distilled-water/ silver nanofluid on heat transfer in a closed cooling system of one of the electrical energy generation units at Isfahan power plant. The difference between this study and previous researches refers to silver properties which have a high thermal conductivity and is non-toxic, hydrophilic and eco-friendly. Distilled water/ silver nanofluid with 20 nm average diameter and 0.1% volume fraction was purchased from Iranian nanomaterials’ Pishgaman company. The volume fractions 0.01%, 0.025%, 0.05%, 0.075% were prepared in the laboratory and thermophysical properties were practically measured in the laboratory. Nanofluids with flow rates from 0.14 to 0.26 kg/s and volume fraction from 0.01% to 0.1% passed through the tubes of heat exchanger and were evaluated in the Reynolds number range of 1500 to 4000. This study was aimed to achieve the overall heat transfer coefficients and pressure drop of the system. According to the system performance index, the results showed that nanofluid can be used to increase the efficiency of heat exchangers and, as an appropriate method, to reduce the dimensions of the exchangers. The results showed that nanofluid increased heat transfer coefficient by 16%. Pressure drop of nanofluid, however, have no significant change compared with the pressure drop of pure water.
机译：本研究调查了蒸馏水/纳米银流体对伊斯法罕发电厂一台发电设备的封闭冷却系统中的热传递的影响。这项研究与以前的研究之间的区别在于银的性质具有高的热导率并且无毒，亲水和生态友好。从伊朗纳米材料公司的Pishgaman公司购买了平均直径为20 nm，体积分数为0.1％的蒸馏水/银纳米流体。在实验室中制备了体积分数0.01％，0.025％，0.05％，0.075％，并且在实验室中实际测量了热物理性质。流量从0.14到0.26 kg / s，体积分数从0.01％到0.1％的纳米流体通过换热器管，并在1500到4000的雷诺数范围内进行了评估。本研究旨在实现整体传热系统的系数和压降。根据系统性能指标，结果表明，纳米流体可用于提高换热器的效率，并作为一种合适的方法来减小换热器的尺寸。结果表明，纳米流体使传热系数提高了16％。然而，与纯水的压降相比，纳米流体的压降没有显着变化。

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