Ultra-high temperature thermal energy storage. Part 2: Engineering and operation

Robinson, Adam

doi:10.1016/j.est.2018.03.013

Cited by 15 publications

(2 citation statements)

References 37 publications

(47 reference statements)

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“…Robinson [141,142] developed a PTES cycle with the aim of using 'ultra-high' temperatures to maximize the round-trip efficiency and energy density. In this system, energy is stored in molten aluminium between 1500 • C and 900 • C and is used to power a gas turbine.…”

Section: Advanced Joule-brayton Ptes Designsmentioning

confidence: 99%

Progress and prospects of thermo-mechanical energy storage—a critical review

et al. 2021

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The share of electricity generated by intermittent renewable energy sources is increasing (now at 26% of global electricity generation) and the requirements of affordable, reliable and secure energy supply designate grid-scale storage as an imperative component of most energy transition pathways. The most widely deployed bulk energy storage solution is pumped-hydro energy storage (PHES), however, this technology is geographically constrained. Alternatively, flow batteries are location independent and have higher energy densities than PHES, but remain associated with high costs and short lifetimes, which highlights the importance of developing and utilizing additional larger-scale, longer-duration and long-lifetime energy storage alternatives. In this paper, we review a class of promising bulk energy storage technologies based on thermo-mechanical principles, which includes: compressed-air energy storage, liquid-air energy storage and pumped-thermal electricity storage. The thermodynamic principles upon which these thermo-mechanical energy storage (TMES) technologies are based are discussed and a synopsis of recent progress in their development is presented, assessing their ability to provide reliable and cost-effective solutions. The current performance and future prospects of TMES systems are examined within a unified framework and a thermo-economic analysis is conducted to explore their competitiveness relative to each other as well as when compared to PHES and battery systems. This includes carefully selected thermodynamic and economic methodologies for estimating the component costs of each configuration in order to provide a detailed and fair comparison at various system sizes. The analysis reveals that the technical and economic characteristics of TMES systems are such that, especially at higher discharge power ratings and longer discharge durations, they can offer promising performance (round-trip efficiencies higher than 60%) along with long lifetimes (>30 years), low specific costs (often below 100 $ kWh−1), low ecological footprints and unique sector-coupling features compared to other storage options. TMES systems have significant potential for further progress and the thermo-economic comparisons in this paper can be used as a benchmark for their future evolution.

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Section: Advanced Joule-brayton Ptes Designsmentioning

confidence: 99%

Progress and prospects of thermo-mechanical energy storage—a critical review

et al. 2021

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“…However, it is important to notice that, even with such low self-consumption ratios, the PHPS-E system can provide significant electricity savings (> 70%) and reach profitability with reasonably short payback periods. The heat losses through the HTES thermal insulation system could be recovered as low-grade heat to further reduce the amount of fuel consumption, as proposed in [47], [48].…”

Section: Capex Of Htes Pgu and Pv Pgu Efficiency Waccnom And Energmentioning

confidence: 99%

Techno-economic analysis of solar PV power-to-heat-to-power storage and trigeneration in the residential sector

2019

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This article assesses whether it is profitable to store solar PV electricity in the form of heat and convert it back to electricity on demand. The impact of a number of technical and economic parameters on the profitability of a self-consumption residential system located in Madrid is assessed. The proposed solution comprises two kinds of heat stores: a low-or medium-grade heat store for domestic hot water and space heating, and a high-grade heat store for combined heat and power generation. Two cases are considered where the energy that is wasted during the conversion of heat into electricity is employed to satisfy either the heating demand, or both heating and cooling demands by using a thermally-driven heat pump. We compare these solutions against a reference case that relies on the consumption of grid electricity and natural gas and uses an electrically-driven heat pump for cooling. The results show that, under relatively favourable conditions, the proposed solution that uses an electrically-driven heat pump could provide electricity savings in the range of 70 -90% with a payback period of 12 -15 years, plus an additional 10 -20% reduction in the fuel consumption. Shorter payback periods, lower than 10 years, could be attained by using a highly efficient thermally driven heat pump, at the expense of increasing the fuel consumption and the greenhouse gas emissions.Hybridising this solution with solar thermal heating could enable significant savings on the global emissions, whilst keeping a high amount of savings in grid electricity (> 70 %) and a reasonably short payback period (< 12 years).

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