Pumped thermal energy storage and bottoming system part A: Concept and model

Abarr, Miles; Geels, Brendan; Hertzberg, Jean; Montoya, Lupita D.

doi:10.1016/j.energy.2016.11.089

Cited by 39 publications

(11 citation statements)

References 15 publications

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“…During the charging process of the energy storage, heat is pumped from cold reservoirs (CRs) to hot reservoirs (HRs) via a heat pump circle and then stored; during the discharging process electricity is generated by the stored thermal energy through the heat-work conversion circle. Owning to the advantages of its high energy density and high efficiency, PHES has captured the attention of researchers as a promising technology for large-scale energy storage in recent years [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31]. The categories of the PHES systems is mainly based on two types of reversible heat-work conversion circles thus far: The Joule-Brayton cycles [25][26][27][28][29][30][31] and the Rankine cycles [14][15][16][17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

“…Under the situations in this study, the maximum absolute value of angular acceleration of the expander rotor and the compressor rotor is 0.0063 rad/s2 and 0.0026 rad/s2 respectively, and the corresponding Pe(t) and Pc(t) is -3.47 kW and 0.36 kW, which are less than ±0.04% of the transient shaft power and can be neglected. By bringing equation (3), (4) into equation (15), (16), and neglecting the unsteady variation of the turbine machines, the transient specific energy can be calculated using equation (19) for the charging process and equation (20)for the discharging process. Where echr and edis are specific energy (J/kg) of shaft work during charging and discharging, Tc,in and Te,in are the inflow temperatures (K) of the compressor and the expander during charging, and the superscript are many, could be arranged.…”

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confidence: 99%

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Cyclic transient behavior of the Joule–Brayton based pumped heat electricity storage: Modeling and analysis

Wang

Lin

Chai

et al. 2019

Renewable and Sustainable Energy Reviews

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Pumped heat electricity storage (PHES) has the advantages of a high energy density and high efficiency and is especially suitable for large-scale energy storage. The performance of PHES has attracted much attention which has been studied mostly based on steady thermodynamics, whereas the transient characteristic of the real energy storage process of PHES cannot be presented. In this paper, a transient analysis method for the PHES system coupling dynamics, heat transfer, and thermodynamics is proposed. Judging with the round trip efficiency and the stability of delivery power, the energy storage behavior of a 10 MW/4 h PHES system is studied with argon and helium as the working gas. The influencing factors such as the pressure ratio, polytropic efficiency, particle diameters, structure of thermal energy storage reservoirs are also analyzed. The results obtained indicate that, mainly owing to a small resistance loss, helium with a round-trip efficiency of 56.9% has an overwhelming advantage over argon with an efficiency of 39.3%. Furthermore, the increases in the pressure ratio and isentropic efficiencies improve the energy storage performance considerably. There also exit optimal values of the delivery compression ratio, particle sizes, length-to-diameter ratios of the reservoirs, and discharging durations corresponding to the maximum round-trip efficiency and preferable discharging power stability. The above can provide a basis for the optimal design and operation of the Joule-Brayton based PHES.

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Cyclic transient behavior of the Joule–Brayton based pumped heat electricity storage: Modeling and analysis

Wang

Lin

Chai

et al. 2019

Renewable and Sustainable Energy Reviews

View full text Add to dashboard Cite

show abstract

“…For systems operating at high pressures, however, the packed-bed containment vessel becomes very expensive. Alternatives include the use a heat exchanger embedded within a solid block [28] or a packed bed with indirect heat transfer, employing a secondary heat exchange fluid [29]. For the first of these, the heat exchanger size is linked to the energy (rather than power) capacity, such that it is likely to be prohibitively expensive for systems with long discharge duration.…”

Section: Storage Mediamentioning

confidence: 99%

Thermodynamic analysis and optimisation of a combined liquid air and pumped thermal energy storage cycle

Farres-Antunez

Xue

White

2018

Journal of Energy Storage

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Pumped thermal energy storage (PTES) and liquid air energy storage (LAES) are two large-scale electricity storage technologies that store energy in the form of thermal exergy. This is achieved by operating mechanicallydriven thermodynamic cycles between thermally insulated storage tanks. Both technologies are free from geographic restrictions that apply to pumped hydro and most compressed air storage. The present paper describes a novel, combined system in which PTES operates as a topping cycle and LAES as a bottoming cycle. The fundamental advantage is that the cold thermal reservoirs that would be required by the two separate cycles are replaced by a single heat exchanger that acts between them, thereby saving significant amounts of storage media per unit of energy stored. In order to reach cryogenic temperatures, the PTES cycle employs helium as the working fluid, while the LAES cycle uses supercritical air (at around 150 bar) which is cooled sufficiently to be fully liquefied upon expansion, thus avoiding recirculation of leftover vapour. A thermodynamic study of a baseline configuration of the combined cycle is presented and results are compared with those of the separate systems. These indicate that the new cycle has a similar round-trip efficiency to that of the separate systems while providing a significantly larger energy density. Furthermore, three adaptations of the base-case combined cycle are proposed and optimised. The best of these adaptations achieves an increase in thermodynamic efficiency of about 10 percent points (from 60 % to 70 %), therefore significantly exceeding the individual cycles in both energy density and efficiency.

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“…The vast majority of proposed transcritical cycles run on carbon dioxide [2]- [7]. The reasons usually cited are that carbon dioxide is low cost, widely available, safe to handle and has low impact on the environment, with high density which allows for a more compact and hence cheaper system.…”

Section: Introductionmentioning

confidence: 99%

A study of working fluids for transcritical pumped thermal energy storage cycles

Koen

Farres-Antunez

White

2019

2019 Offshore Energy and Storage Summit (OSES)

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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%. Index Terms-pumped thermal energy storage, working fluid, transcritical cycle

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Pumped thermal energy storage and bottoming system part A: Concept and model

Cited by 39 publications

References 15 publications

Cyclic transient behavior of the Joule–Brayton based pumped heat electricity storage: Modeling and analysis

Cyclic transient behavior of the Joule–Brayton based pumped heat electricity storage: Modeling and analysis

Thermodynamic analysis and optimisation of a combined liquid air and pumped thermal energy storage cycle

A study of working fluids for transcritical pumped thermal energy storage cycles

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