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
Abstract
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/ | ||||||||||||
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Document Type: | Article | ||||||||||||
Title: | Detailed numerical investigation of a pumped thermal energy storage with low temperature heat integration | ||||||||||||
Authors: |
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Date: | 15 February 2018 | ||||||||||||
Journal or Publication Title: | Energy | ||||||||||||
Refereed publication: | Yes | ||||||||||||
Open Access: | No | ||||||||||||
Gold Open Access: | No | ||||||||||||
In SCOPUS: | Yes | ||||||||||||
In ISI Web of Science: | Yes | ||||||||||||
Page Range: | pp. 665-676 | ||||||||||||
Publisher: | Elsevier | ||||||||||||
ISSN: | 0360-5442 | ||||||||||||
Status: | Published | ||||||||||||
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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