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Thermodynamic Design of a Pumped Thermal Energy Storage

Lange, Johannes (2018) Thermodynamic Design of a Pumped Thermal Energy Storage. Master's.

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Abstract

With regard to large-scale electricity storage systems, the concept of Pumped Thermal Energy Storage systems (PTES) has emerged in the last years. PTES systems store electrical energy in the form of thermal energy, which is later reconverted to electrical energy. Unlike pumped hydro power or compressed air energy storage, this technology allows for a site-independent installation. Compared to batteries, the durability is expected to be higher. The considered PTES system consists of a heat pump, a thermal storage system and an Organic Rankine Cycle. So far, comparable systems were mainly investigated at temperature levels below 160 ◦C using standard cycles. In this work, a pumped thermal energy storage system is investigated at significantly higher storage temperatures of 194 ◦C and 306 ◦C. After the selection of compatible working fluids and storage materials, cycle enhancements are applied to the heat pump and heat engine. A parameter variation and an exergy analysis identify the crucial components and losses. Besides the application as a pure electricity storage, the options of heat integration and extraction are considered. It could be shown that higher storage temperatures lead in general to a higher electric storage efficiency. At a storage temperature of 194 ◦C, power to power efficiencies of 59.3 % are possible when employing efficient machinery and heat exchangers. At even higher temperatures of 306 ◦C, the efficiency could not be further increased due to the lack of suitable working fluids. All simulations were conducted in EBSILON®

Item URL in elib:https://elib.dlr.de/122288/
Document Type:Thesis (Master's)
Title:Thermodynamic Design of a Pumped Thermal Energy Storage
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Lange, JohannesJ.Lange (at) dlr.deUNSPECIFIED
Date:2018
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Number of Pages:73
Status:Submitted
Keywords:Power-to-heat-to-power, PTES, Pumped thermal energy storage, STrom-Wärme-Strom, elektrischer Energiespeicher
HGF - Research field:Energy
HGF - Program:Energy Efficiency, Materials and Resources
HGF - Program Themes:Methods and Concepts for Materials Development
DLR - Research area:Energy
DLR - Program:E VS - Combustion Systems
DLR - Research theme (Project):E - Materials for Energy Technologies
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Jockenhöfer, Henning
Deposited On:19 Oct 2018 09:30
Last Modified:19 Oct 2018 09:30

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