The cold store for a pumped thermal energy storage system

The cold store for a pumped thermal energy storage system
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抽水蓄热系统的冷库

DOI:
10.1016/j.est.2017.03.009
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发表时间:
2017
影响因子:
9.4
通讯作者:
Davenne T
Davenne T
中科院分区:
工程技术2区
文献类型:
--
作者:
Davenne T

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近年来,人们提出了一些关于气体压缩和膨胀以及储热的热力学循环作为有效的能量储存方式的建议。其中包括Desrues[1]的工作,他提出了一种用于大规模电力应用的热能储存过程,Isentropic Ltd[2]正在研究抽水蓄能系统,Garvey提出了使用风力驱动的热泵系统(称为wind - tp[3])来储存风能。所有这些系统都需要一个能够储存热能的冷库和一个冷库,这些热能以后可以用来发电。抽水蓄能的效率和最终成功采用将取决于储热的有效性。在本文中,我们比较了填料床和液态温跃层作为海上风- tp系统冷库的性能。通过模拟比较了两种选择的火用性能,得出了液体温跃层比填充层温跃层更有效的结论。为了避免与温跃层锋的涂抹相关的火用损失,建议在液体储存中增加一个涉及将冷热流体分离的滑动隔板。
In recent years several proposals for thermodynamic cycles involving the compression and expansion of gas and thermal storage have been put forward as effective ways of storing energy. These include the work of Desrues [1] who proposed a thermal energy storage process for large scale electric applications, Isentropic Ltd [2] who were working on a pumped thermal energy storage system and Garvey who proposed storing wind energy using a wind driven thermal pumping system known as Wind-TP [3]. All these systems require a hot and a cold store capable of storing thermal energy which can later be used to generate electricity. The efficiency and ultimately the successful adoption of pumped thermal energy storage will depend on the effectiveness of the thermal stores. In this paper we compare the performance of a packed bed and a liquid thermocline as the cold store for an off-shore Wind-TP system. Simulations are used to compare the exergetic performance of the two options leading to the conclusion that a liquid thermocline has potential to be significantly more effective than a packed bed thermocline. An addition to a liquid store involving a sliding divider separating warm and cold fluid is proposed as a way of avoiding exergy losses associated with the smearing of a thermocline front.
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