A study of working fluids for transcritical pumped thermal energy storage cycles
A study of working fluids for transcritical pumped thermal energy storage cycles
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DOI：
10.1109/oses.2019.8867217
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发表时间：
2019-07
期刊：
影响因子：
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通讯作者：
A. Koen;Pau Farres Antunez;A. White
中科院分区：
文献类型：
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作者：
A. Koen;Pau Farres Antunez;A. White
电力储存被广泛认为是可持续能源未来的关键，目前部署的技术，如抽水蓄能具有限制它们可以实施的规模的缺点。泵送热能储存（PTES）最近开始吸引人们的兴趣作为替代方案。这篇文章的重点是跨临界循环，目的是确定最好的工作流体，在一个单一的热存储和没有冷存储的配置。热存储器考虑了三种不同的存储介质：水、Therminol D12和Therminol 66。对于跨临界循环，对176种不同的工作流体进行了热力学、环境和安全适用性筛选，并在一系列储存温度下对所得的8种流体进行了循环测试。最佳的往返效率是热交换器损失和热交换器损失之间的折衷。帕累托前沿被用来排名的效率，功率密度和热功比的流体。最有前途的流体被认为是三氟碘甲烷（R13I1）的峰值往返效率为57.6%。
Electricity storage is widely regarded as critical to a sustainable energy future, and currently deployed technologies such as pumped hydroelectric storage have drawbacks which limit the scale to which they can be implemented. Pumped thermal energy storage (PTES) has recently started to attract interest as an alternative. This article focuses on transcritical cycles and aims to identify the best working fluids, in a configuration with a single hot store and no cold store. Three different storage media were considered for the hot store: water, Therminol D12, and Therminol 66. For the transcritical cycle, 176 different working fluids were screened for thermodynamic, environmental and safety suitability, and the resulting list of 8 fluids was tested with cycles at a range of storage temperatures. The optimal round-trip efficiency is a trade-off between heat exchanger losses and turbomachinery losses. Pareto fronts were used to rank the fluids for efficiency, power density, and heat to work ratio. The most promising fluid was found to be trifluoroiodomethane (R13I1) with a peak round-trip efficiency of 57.6%.