A low-temperature glide cycle for pumped thermal energy storage

Koen, A.D.; Farres-Antunez, Pau; Macnaghten, James; White, Abraham

doi:10.1016/j.est.2021.103038

Cited by 14 publications

(4 citation statements)

References 29 publications

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“…In fact, the storage temperature of around 220°C lies close to the value that minimises the total cost per unit exergy, estimates for which are in the range 25–35 £/kWh e . 41 (The value estimated by Margen et al 13 lies within this range once corrected for inflation.) Judging this too expensive, Margen et al proposed the use of excavated underground cavities, for which they claimed an almost four-fold reduction in cost relative to steel pressure vessels.…”

Section: Thermal Storage Optionsmentioning

confidence: 70%

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A feedheat-integrated energy storage system for nuclear-powered steam plant

Lazenby,

Shwageraus,

White

2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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The paper provides thermodynamic analysis of an energy storage concept in which thermal stores are coupled with the feedwater heating train of nuclear-powered steam plant. This allows the electrical output of the plant to be flexed whilst maintaining constant reactor power, thereby providing the equivalent of an electricity storage system and facilitating the adoption of a load-following role for nuclear plant. The concept falls under the umbrella of ‘generation-integrated energy storage’, which exploits existing hardware required for generation to reduce storage costs, and benefits also from fewer energy transformations when compared to ‘electricity-in-electricity-out’ forms of storage. This means that a high (effective) round-trip efficiency can be achieved at low cost. An important feature of the proposed system is that the turbine bleed flows (at their various pressures and temperatures) automatically provide good thermal matching with the feedwater temperature profile, so that heat can ultimately be transferred to and from sensible-heat thermal-storage media with high exergetic efficiency. Various options are discussed for the thermal stores, including pressurised water tanks, thermal oils and packed beds. The analysis also includes consideration of the off-design behaviour of cycle components.

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Section: Thermal Storage Optionsmentioning

confidence: 70%

“…Preliminary estimates of cost for multiple packed-bed systems suggest values in the range 25-35 £/kWh e . 41…”

Section: Direct Pressurised Water Storagementioning

confidence: 99%

A feedheat-integrated energy storage system for nuclear-powered steam plant

Lazenby,

Shwageraus,

White

2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…Najveći procenat izgrađenih kapaciteta skladišta električne energije, čak 94% na svjetskom nivou, izveden je u vidu hidro-pumpnih skladišta energije [3]. Osnovni nedostatak ovog vida skladištenja jeste geografska ograničenost.…”

Section: Skladištenje Električne Energijeunclassified

Skladištenje Električne Energije Primjenom Reverzibilne Toplotne Pumpe, Toplotnog Skladišta I Orc Ciklusa

Nježić,

Stepanov

2024

Zbornik radova FTN

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Očuvanje životne sredine i proces dekarbonizacije doveli su do sve veće upotrebe obnovljivih izvora energije. Sistemi za proizvodnju električne energije iz obnovljivih izvora zahtijevaju izgradnju skladišta električne energije da bi se njihov potencijal iskoristio. Postoje različite tehnologije skladištenja energije. Jedan od njih je i toplotno-pumpno skladište u kome se električna energija skladišti u vidu toplotne, te potom ponovo transformiše u električnu. U ovom radu, ispitano je da li ovi sistemi mogu da dostignu efikasnost veću od 70% za definisane parametre i radno sredstvo. Takođe, ispitan je uticaj efikanosti energetskih mašina na ukupnu efikasnost sistema.

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“…Despite a rapid increase of its globally installed capacity (International Energy Agency (IEA) [19]), a range of technical obstacles such as land requirement or weather-dependent intermittency are still limiting its broad utilisation (Capellán-Pérez et al [5]). In addition to improving storage technologies (Koen et al [22]), accurate energy supply forecasting at different spatio-temporal scales would facilitate power grid balancing (Inman et al [17], Tawn and Browell [53], Impram et al [16]). To that end, local and remote sensing offer an opportunity to measure weather variability and model its impact on solar energy generation (Yang et al [61]).…”

Section: Introductionmentioning

confidence: 99%

Omnivision forecasting: combining satellite observations with sky images for improved intra-hour solar energy predictions

Quentin¹,

Arbod²,

Lasenby³

2022

Preprint

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Integration of intermittent renewable energy sources into electric grids in large proportions is challenging. A wellestablished approach aimed at addressing this difficulty involves the anticipation of the upcoming energy supply variability to adapt the response of the grid. In solar energy, short-term changes in electricity production caused by occluding clouds can be predicted at different time scales from all-sky cameras (up to 30-min ahead) and satellite observations (up to 6h ahead). In this study, we integrate these two complementary points of view on the cloud cover in a single machine learning framework to improve intra-hour (up to 60-min ahead) irradiance forecasting. Both deterministic and probabilistic predictions are evaluated in different weather conditions (clear-sky, cloudy, overcast) and with different input configurations (sky images, satellite observations and/or past irradiance values). Our results show that the hybrid model benefits predictions in clear-sky conditions and improves longer-term forecasting. This study lays the groundwork for future novel approaches of combining sky images and satellite observations in a single learning framework to advance solar nowcasting.

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A low-temperature glide cycle for pumped thermal energy storage

Cited by 14 publications

References 29 publications

A feedheat-integrated energy storage system for nuclear-powered steam plant

A feedheat-integrated energy storage system for nuclear-powered steam plant

Skladištenje Električne Energije Primjenom Reverzibilne Toplotne Pumpe, Toplotnog Skladišta I Orc Ciklusa

Omnivision forecasting: combining satellite observations with sky images for improved intra-hour solar energy predictions

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