Exceptional cold-crystallization kinetics of erythritol-polyelectrolyte enables long-term thermal energy storage

Glass-transition and cold-crystallization of a sugar alcohol phase change material dispersed within ionic citrate cross-linked polyvinyl alcohol enable long-term heat storage.

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Impact of a Thermo-Hydraulic Insulation Layer on the Long-Term Response of Soil-Borehole Thermal Energy Storage Systems

Geo-Chicago 2016 ◽

10.1061/9780784480137.013 ◽

2016 ◽

Author(s):

Tugce Baser ◽

John S. McCartney ◽

Ali Moradi ◽

Kathleen Smits ◽

Ning Lu

Keyword(s):

Energy Storage ◽

Thermal Energy ◽

Thermal Energy Storage ◽

Storage Systems ◽

Insulation Layer ◽

Energy Storage Systems ◽

Thermal Energy Storage Systems ◽

Term Response

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Preliminary prospects of a Pumped Thermal Energy Storage (PTES) based on a supercritical CO2 Brayton cycle

10.31224/osf.io/zuct2 ◽

2021 ◽

Author(s):

Karin Astrid Senta Edel ◽

František Hrdlička ◽

Václav Novotný

Keyword(s):

Energy Storage ◽

Thermal Energy ◽

Thermal Energy Storage ◽

Supercritical Co2 ◽

Storage Systems ◽

Renewable Energy Sources ◽

Brayton Cycle ◽

Term Energy ◽

Weather Changes

As part of the change towards a higher deployment of renewable energy sources, which naturally deliver energy intermittently, the need for energy storage systems is increasing. For compensation of disturbance in power production due to inter-day to seasonal weather changes, long-term energy storage is required. In the spectrum of storage systems, one out of a few geographically independent possibilities is the storage of electricity in heat, so-called Carnot-Batteries. This paper presents a Pumped Thermal Energy Storage (PTES) system based on a recuperated supercritical CO2 Brayton cycle. The modelled system provides a round-trip efficiency of 38.9%.

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Comparative investigations of sorption/resorption/cascading cycles for long-term thermal energy storage

Applied Energy ◽

10.1016/j.apenergy.2021.117991 ◽

2022 ◽

Vol 306 ◽

pp. 117991

Author(s):

G.L. An ◽

S.F. Wu ◽

L.W. Wang ◽

C. Zhang ◽

B. Zhang

Keyword(s):

Energy Storage ◽

Thermal Energy ◽

Thermal Energy Storage

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Seasonal Energy Flexibility Through Integration of Liquid Sorption Storage in Buildings

Energies ◽

10.3390/en13112944 ◽

2020 ◽

Vol 13 (11) ◽

pp. 2944

Author(s):

Luca Baldini ◽

Benjamin Fumey

Keyword(s):

Energy Storage ◽

Heat Pump ◽

Thermal Energy ◽

Thermal Energy Storage ◽

Energy System ◽

Coefficient Of Performance ◽

Electric Load ◽

Single Family ◽

Electricity Grid

The article estimates energy flexibility provided to the electricity grid by integration of long-term thermal energy storage in buildings. To this end, a liquid sorption storage combined with a compression heat pump is studied for a single-family home. This combination acts as a double-stage heat pump comprised of a thermal and an electrical stage. It lowers the temperature lift to be overcome by the electrical heat pump and thus increases its coefficient of performance. A simplified model is used to quantify seasonal energy flexibility by means of electric load shifting evaluated with a monthly resolution. Results are presented for unlimited and limited storage capacity leading to a total seasonal electric load shift of 631.8 kWh/a and 181.7 kWh/a, respectively. This shift, referred to as virtual battery effect, provided through long-term thermal energy storage is large compared to typical electric battery capacities installed in buildings. This highlights the significance of building-integrated long-term thermal energy storage for provision of energy flexibility to the electricity grid and hence for the integration of renewables in our energy system.

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