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首页> 外文期刊>International Journal of Heat and Mass Transfer >CFD analysis of triple-pipes for a district heating system with two simultaneous supply temperatures
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CFD analysis of triple-pipes for a district heating system with two simultaneous supply temperatures

机译：具有两个同时供气温度的区域供热系统的三重管道的CFD分析

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摘要

Employing triple-pipes for simultaneous yet separate supply of space heating and domestic hot water demands of district heating network is an interesting solution for decreasing the rate of losses and increasing the cost-effectiveness of district heating systems. Although the thermodynamic performance of triple-pipes has been studied before, there is not any detailed performance analysis of such pipes, especially for the specific two-supply-temperature district heating design. This study employs computational fluid dynamic methods to investigate the feasibility of using triple-pipes for this district heating scheme and presents a detailed report of the thermal behavior of such pipes under different operational conditions including different pipe arrangements within the casing. For better understanding the effect of using triple-pipes in such a district heating system, the results obtained for this type of pipe is compared to those given for a twin-pipe in a regular district heating system. The results show that a triple-pipe with any arrangement is better than a twin-pipe supply method while this enhancement can be much better with a triangular arrangement of the three lines within the casing. With certain supply and return temperatures for a 10 km long pipeline, the rate of heat loss from the most efficient triple-pipe design is only 80 kW while it is about 145 kW for the twin-pipe system. (C) 2019 Elsevier Ltd. All rights reserved.
机译：使用三管同时但分开供应空间供热和区域供热网络的生活热水需求是降低损失率和提高区域供热系统成本效益的有趣解决方案。尽管以前已经研究了三重管道的热力学性能，但没有针对此类管道的任何详细性能分析，尤其是对于特定的两供热区域供热设计。这项研究采用计算流体动力学方法来研究在该区域供热方案中使用三重管道的可行性，并详细介绍了这种管道在不同操作条件下（包括套管内不同管道布置）的热行为。为了更好地理解在这种区域供热系统中使用三重管道的效果，将此类管道的结果与常规区域供热系统中双管道的结果进行了比较。结果表明，任何布置的三管都比双管供应方法更好，而在套管内三根管路呈三角形布置的情况下，这种增强效果会更好。在10公里长的管道具有一定的供热和返回温度的情况下，最有效的三重管道设计所产生的热量损失率仅为80 kW，而双管道系统的热量损失率约为145 kW。 （C）2019 Elsevier Ltd.保留所有权利。

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