Pumped Thermal Energy Storage With Liquid Storage

Joshua McTigue, Pau Farres-Antunez, Christos Markides, Alexander White

Research output: Chapter in Book/Report/Conference proceedingChapter


Pumped Thermal Energy Storage (PTES) uses electricity to power a heat pump; transferring heat from a cold space to a hot space forms a hot and a cold thermal reservoir, thereby storing energy. To discharge, the temperature difference between the two stores is used to drive a heat engine which generates electricity. In this chapter, PTES systems which store energy in liquids will be described. The chapter will concentrate on Joule-Brayton power cycles with molten salt storage. Part-load operation of Joule-Brayton PTES with liquid storage can be managed with "inventory control," and it is demonstrated that this control method leads to relatively good performance over a range of operating points.
Original languageAmerican English
Title of host publicationEncyclopedia of Energy Storage
Subtitle of host publicationVolume 2 - Thermal Mechanical Energy Storage; Electrochemical Storage
EditorsL. F. Cabeza
StatePublished - 2022

NREL Publication Number

  • NREL/CH-5700-78767


  • Carnot batteries
  • energy storage
  • inventory control
  • molten salts
  • off-design modeling
  • pumped thermal energy storage
  • thermal storage
  • two-tank liquid storage


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