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Detailed numerical investigation of a pumped thermal energy storage with low temperature heat integration

Jockenhöfer, Henning and Steinmann, Wolf-Dieter and Bauer, Dan (2018) Detailed numerical investigation of a pumped thermal energy storage with low temperature heat integration. Energy (145), pp. 665-676. Elsevier. ISSN 0360-5442

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Official URL: https://www.sciencedirect.com/science/article/pii/S0360544217321308


In future energy systems, storage technologies for electrical energy are considered to be a key component for increasing the share of renewable energy use. Pumped thermal energy storage technologies represent a promising approach to complement established storage technologies such as pumped-hydro power storages without their geological restrictions. Assuming an ideal, reversible and adiabatic energy conversion process, the stored electrical energy can be entirely recovered. However, the efficiency of real processes is limited by irreversibilities. These exergy losses can be compensated by the integration of low temperature heat. The exergetic efficiency can be further increased by using thermal energy provided during discharging. In this paper, a fully heat-integrated, subcritical PTES using butene as the working fluid is presented. The results of a detailed numerical simulation of the cycle regarding exergy losses during heat transfer, efficiencies of machinery and parasitic energy consumption are shown. A maximum net electrical power ratio between charging and discharging of 125% is obtained, while the maximum exergetic efficiency is 59%. The conducted numerical simulation includes pressure losses and pinch points, allowing for a more in-depth understanding and for a pre-optimization of the hydraulic design.

Item URL in elib:https://elib.dlr.de/118673/
Document Type:Article
Title:Detailed numerical investigation of a pumped thermal energy storage with low temperature heat integration
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Jockenhöfer, HenningHenning.Jockenhoefer (at) dlr.deUNSPECIFIED
Steinmann, Wolf-Dieterwolf.steinmann (at) dlr.deUNSPECIFIED
Bauer, DanDan.Bauer (at) dlr.deUNSPECIFIED
Date:15 February 2018
Journal or Publication Title:Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 665-676
Keywords:Pumped thermal energy storage; PTES; Subcritical; ORC; Butene; Power to heat to power; Waste heat integration; ORC-CHEST
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Thermal Energy Storage
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Thermochemical Processes (Storage)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Jockenhöfer, Henning
Deposited On:04 Apr 2018 13:09
Last Modified:04 Apr 2018 13:09

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