Combining cooling of underground railways with heat recovery and reuse
Combining cooling of underground railways with heat recovery and reuse
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DOI：
10.1016/j.scs.2018.11.045
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发表时间：
2019-02
影响因子：
11.7
通讯作者：
G. Davies;N. Boot-Handford;D. Curry;W. Dennis;A. Ajileye;A. Revesz;G. Maidment
中科院分区：
文献类型：
--
作者：
G. Davies;N. Boot-Handford;D. Curry;W. Dennis;A. Ajileye;A. Revesz;G. Maidment
该文件涉及二次/废热的回收和利用，并确定伦敦的二次热源为71 TWh，即比需求多10%。伦敦地铁（LU）铁路隧道产生大量的低品位热量。还需要主动冷却来扭转隧道温度上升的长期趋势。提出了一种利用既有通风井的LU隧道冷热联合回收方案。回收的热量使用热泵进行升级，以便在当地区域供热网络（DHN）中重复使用。开发了一个新的模型来研究热力学性能，经济可行性和潜在的碳节约。得出的结论是，该系统可以同时为隧道提供900千瓦的冷却，并在升级到70 °C后，提供约1.1兆瓦的热量，可用作DHN的来源。该模型预测，这可以经济地进行，并可以节省大量的碳和成本。在伦敦有200个通风井，每年可以节省超过36万吨的碳，同时产生4000万英镑的收入。将这项技术应用于全球150个地铁系统中的50%，将节省超过2700万吨的碳。
The paper concerns the recovery and use of secondary/waste heat and identifies secondary heat sources in London of 71 TWh i.e. c10% more than demand. London Underground (LU) railway tunnels generate significant quantities of low grade heat. There is also a requirement for active cooling to reverse the long term trend of rising tunnel temperatures. A novel combined cooling and heat recovery scheme for LU tunnels, utilising existing ventilation shafts, was proposed. Recovered heat was upgraded using a heat pump, for reuse in a local district heating network (DHN). A new model was developed to investigate the thermodynamic performance, economic feasibility and potential carbon savings available. It was concluded that the system could simultaneously provide 900 kW of cooling to the tunnel, and after upgrading to 70 °C, approximately 1.1 MW of heat, which could be used as a source for a DHN. The model predicted that this could be carried out economically and could deliver massive carbon and cost savings. With 200 ventilation shafts in London, >360,000 tonnes of carbon could be saved annually, while generating revenues of £40,000,000. Applying this technology to 50% of 150 metro systems worldwide would enable more than 27 million tonnes of carbon savings.