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ANALYSIS OF OPERATION TEST RESULTS OF A HIGH TEMPERATURE PHASE CHANGE STORAGE FOR PARABOLIC TROUGH POWER PLANTS WITH DIRECT STEAM GENERATION

Laing, Doerte and Eck, Markus and Hempel, Matthias and Steinmann, Wolf-Dieter and Meyer-Grünefeldt, Mirko and Eickhoff, Martin (2012) ANALYSIS OF OPERATION TEST RESULTS OF A HIGH TEMPERATURE PHASE CHANGE STORAGE FOR PARABOLIC TROUGH POWER PLANTS WITH DIRECT STEAM GENERATION. ASME 2012 6th International Conference on Energy Sustainability, 23.-26. Juli 2012, San Diego, USA.

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Abstract

For future parabolic trough plants direct steam generation in the receiver pipes is a promising option for reducing the costs of solar thermal energy [1]. These new solar thermal power plants require innovative storage concepts, where the two phase heat transfer fluid poses a major challenge [2]. For the regions where the heat transfer fluid is in a single phase (water or steam), sensible heat storage using molten salt [3] or concrete [4] as storage material can be applied. However, efficient energy storage in the two-phase evaporation/condensation region requires heat storage operation within a narrow temperature range. For this two phase region, a high performance PCM storage technology was developed and demonstrated by DLR. A test module using 14 tons of PCM with 700 kWh capacity was built in 2009 and commissioned in 2010 in a direct steam test loop, set up at the power plant Litoral of Endesa in Carboneras, Spain [5]. The PCM-storage uses Sodium nitrate as phase change material with a melting temperature of 305 °C. Cycle testing has started end of 2010. Cycling tests have proven the expected discharge capacity of approx. 700 kWh for the PCM-storage module. System operation in constant pressure mode and sliding pressure mode has been conducted for the PCM-storage. While in the constant pressure mode a peak performance of the storage of more than 700 kW could be demonstrated, in the sliding pressure mode a constant power output over almost the whole charge and discharge period could be provided. The paper discusses the test results and evaluation for different operation modes for the phase change storage for discharge operation. Charging of the phase change storage is always in a once-through mode. However, for discharge, the steam can be generated either in forced or natural circulation mode or in once-through mode, leading to very different effects for the two-phase flow and filling level inside the heat exchanger pipes in the storage. The effects for forced and natural circulation discharge will be analysed and described in the paper.

Item URL in elib:https://elib.dlr.de/79659/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:ANALYSIS OF OPERATION TEST RESULTS OF A HIGH TEMPERATURE PHASE CHANGE STORAGE FOR PARABOLIC TROUGH POWER PLANTS WITH DIRECT STEAM GENERATION
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Laing, Doertedoerte.laing (at) dlr.deUNSPECIFIED
Eck, Markusmarkus.eck (at) dlr.deUNSPECIFIED
Hempel, Matthiasmatthias.hempel (at) dlr.deUNSPECIFIED
Steinmann, Wolf-Dieterwolf.steinmann (at) dlr.deUNSPECIFIED
Meyer-Grünefeldt, Mirkomirko.meyer-gruenefeldt (at) dlr.deUNSPECIFIED
Eickhoff, Martinmartin.eickhoff (at) dlr.deUNSPECIFIED
Date:July 2012
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Thermal Energy Storage, Phase Change Material, Concrete, Parabolic Trough Power Plant, Direct Steam Generation, Testing, Operation Mode, Forced Circulation, Natural Circulation
Event Title:ASME 2012 6th International Conference on Energy Sustainability
Event Location:San Diego, USA
Event Type:international Conference
Event Dates:23.-26. Juli 2012
Organizer:ASME
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion and Use (old)
HGF - Program Themes:Energy-efficient Processes (old)
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Thermochemische Prozesse (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Laing, Dörte
Deposited On:18 Dec 2012 17:45
Last Modified:18 Dec 2012 17:45

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