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The cold store for a pumped thermal energy storage system

Davenne, T.R.; Garvey, S.D.; Cardenas, B.; Simpson, M.C.


T.R. Davenne

Senior Research Fellow in Thermo-Mechanical Energy Storage

M.C. Simpson


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.


Davenne, T., Garvey, S., Cardenas, B., & Simpson, M. (2017). The cold store for a pumped thermal energy storage system. Journal of Energy Storage, 14(2),

Journal Article Type Article
Acceptance Date Mar 19, 2017
Online Publication Date Apr 1, 2017
Publication Date Dec 1, 2017
Deposit Date Aug 15, 2017
Publicly Available Date Aug 15, 2017
Journal Journal of Energy Storage
Electronic ISSN 2352-152X
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 14
Issue 2
Keywords Pumped thermal energy storage; Cold store; Wind-TP
Public URL
Publisher URL


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