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首页> 外文期刊>Heat Transfer Research >NUMERICAL INVESTIGATION OF THE EFFECT OF THE TANK DIAMETER TO TANK LENGTH RATIO ON THE THERMAL PERFORMANCE OF A HORIZONTAL MANTLED HOT WATER TANK
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NUMERICAL INVESTIGATION OF THE EFFECT OF THE TANK DIAMETER TO TANK LENGTH RATIO ON THE THERMAL PERFORMANCE OF A HORIZONTAL MANTLED HOT WATER TANK

机译：坦克直径与罐长比对水平铺设热水箱热性能影响的数值研究

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摘要

This study deals with determination of the effect of the ratio of tank diameter D to tank length L on the thermal performance of horizontal mantled hot water tanks. The D/L ratio has a great impact on the thermal performance of hot water tanks because the storage volume and heat transfer surface area of a tank change with the D/L ratio. In this study, the effect of different D/L ratios on thermal performance for a horizontal mantled hot water tank was investigated numerically by considering a constant storage volume and heat transfer surface area separately. The D/L was taken equal to 0.35, 0.50, and 0.65. The FLUENT 17.1 code was used in numerical analyses. The numerical model was validated by experimental data. The results were evaluated in terms of energy and exergy efficiencies. The results showed that a shorter tank length caused higher inlet water jet effects. So, lower D/L ratios yield higher thermal performance for a horizontal mantled hot water tank. The highest exergy efficiencies were seen at D/L = 0.35 for a constant heat transfer surface area and a constant storage volume. Mantle flow and main flow rates had no significant effects on energy and exergy efficiencies. However, they significantly changed the stored water temperature. An increasing mantle inlet temperature decreased the exergy efficiency, an increasing main inlet temperature increased the exergy efficiency. However, since the main objective of a hot water tank is to supply high temperature hot water, the mantle inlet temperature should be higher. Energy efficiency was nearly 98% and almost same for all cases. Exergy efficiency changed from 10% to 60% among different cases.
机译：该研究涉及测定罐直径D与罐长L比率L的效果对水平搭砂热水箱的热性能。 D / L比对热水箱的热性能产生了很大的影响，因为罐的存储体积和传热表面区域随着D / L比而变化。在该研究中，通过考虑恒定的储存体积和传热表面积分别考虑恒定的储存体积和传热表面积来研究不同的D / L比对水平搭扣热水箱热性能的影响。 D / L等于0.35,0.50和0.65。流畅的17.1代码用于数值分析。实验数据验证了数值模型。结果是在能量和漏洞效率方面进行评估的。结果表明，槽长度较短引起更高的入口水射流效果。因此，降低D / L比率为水平搭配的热水箱产生更高的热性能。对于恒定的传热表面积和恒定的存储体积，在D / L = 0.35处看到最高的漏效率。地幔流和主要流速对能量和漏洞效率没有显着影响。然而，它们显着改变了储存的水温。增加的披风入口温度降低了高度效率，提高了最大的入口温度提高了效率。然而，由于热水箱的主要目的是提供高温热水，因此搭式入口温度应更高。能源效率近98％，对所有情况几乎相同。 Deerveny效率从不同案件的10％变为60％。

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