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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：两种同时供应温度的地区供热系统的三联管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：采用三管用于同时但独立的空间供热供应和家庭供暖网络的热水需求是一个有趣的解决方案，用于降低损失率和提高地区供热系统的成本效益。虽然之前研究了三管的热力学性能，但这些管道没有任何详细的性能分析，特别是对于特定的两种供暖区域供热设计。本研究采用计算流体动力学方法来研究使用该地区加热方案的三管材的可行性，并在包括壳体内的不同管道布置的不同操作条件下提出了这种管道的热行为的详细报道。为了更好地理解在这种区域加热系统中使用三管材的效果，将这种类型的管道获得的结果与常规区域加热系统中的双管给出的结果进行比较。结果表明，具有任何布置的三管比双管供应方法更好，而这种增强可以更好地用壳体内的三条线的三角形布置。对于10公里长管道的某些供应和返回温度，最有效的三管设计的热量速度仅为80千瓦，而双管系统约为145千瓦。 （c）2019 Elsevier Ltd.保留所有权利。

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