An investigation of Cooling Unit Performance on the London Underground Railway Network
An investigation of Cooling Unit Performance on the London Underground Railway Network
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伦敦地铁网络冷却装置性能调查
DOI：
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发表时间：
2016
期刊：
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通讯作者：
G. Maidment
中科院分区：
文献类型：
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作者：
G. Maidment
2012年，伦敦地铁成功地在绿地公园和牛津广场安装了两项创新的冷却技术。这些冷却系统采用了伦敦地铁为隧道环境中的特定应用而设计的定制平台空气处理机组（AHU）。当火车停在车站时，这些装置吸入由火车散发的热空气。当空气通过专门设计的水基冷却盘管时，空气被冷却，然后从机组直接排出到乘客等待的平台上。
在这一初步成功的基础上，伦敦地铁公司实施了一项新的研发项目，以评估下一代阿胡斯的设计方案，重点是降低未来安装的整个寿命成本。该研发项目的一个特殊方面是研究单元内部组件的清洁，这些组件受到空气传播的灰尘颗粒的影响，因此容易导致性能损失。本次调查的目的是确定设计方案，以减少机组的维护要求和定期轨道访问的需要，同时保持高冷却性能，从而为伦敦地铁节省大量成本。本文的研究对象是各种换热器盘管结构上灰尘积聚模式之间的差异以及空气侧污垢对盘管换热性能的影响。
In 2012 London Underground successfully installed two new innovative cooling technologies at Green Park and Oxford Circus. These cooling systems utilise bespoke platform air handling units (AHU’s) designed by London Underground for specific application in a tunnel environment. The units intake warm air dissipated by the trains as they stop at the stations. The air is cooled as it passes through specially designed water based cooling coils and then exhausted from the units directly onto the platforms where passengers are waiting.
Building on this initial success London Underground has implemented a new R&D project to assess design options for the next generation of AHUs with the focus being on reducing whole life costs of future installations. One particular aspect of this R&D project was to investigate cleaning of the internal components of the units, which are subjected to air borne dust particles and therefore prone to performance losses. The aim of this investigation was to identify design options which reduce the maintenance requirements of the units and the need for regular track access, whilst maintaining the high cooling performance, thus providing significant cost savings to London Underground. The study of differences between dust accumulation patterns on various heat exchanger coil configurations and the resultant impact of the air side fouling on the coil heat exchange performance is the subject of this paper.