Molten salt selection methodology for medium temperature liquid air energy storage application

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Power production research in the recent years is moving towards renewable energy sources with the aim to reduce CO 2 emissions. A potential means to overcome the obstacles placed by the intermittent nature of the most common sustainable energy sources is represented by the Liquid Air Energy Storage (LAES)systems. In order to improve its round trip efficiency, which is currently at 50%, the use of a common thermal medium for thermal storage and heat transfer fluid is considered as an effective solution. Molten salts were selected as the common thermal medium in this work, where a novel methodology for identifying and evaluating alternative mixtures is introduced. Firstly, various literature correlations were collected to form a thermo-physical property database of low melting temperature molten salts. These correlations were integrated in Aspen + by implementing a hybrid simulation technique for property estimation. These simulations were followed by a parametric analysis where 70 molten salt mixtures were evaluated in terms of thermo-physical properties by means of a performance and system index parameter. Following this process, 16 new molten salt mixtures were selected for the experimental campaign to measure their melting point temperature. As a result, two new alternative molten salt mixtures were found to have a low melting point of 95 °C and 105 °C, whilst providing a 37% and 34% increase in the performance indicator value. Hence, the presented methodology was proven to be an effective and versatile tool in identifying alternative salt mixtures, and can be adapted for comparable applications.

Original languageEnglish
Pages (from-to)500-511
Number of pages12
JournalApplied Energy
Volume248
DOIs
Publication statusPublished - 6 May 2019

Fingerprint

Molten materials
Salts
salt
liquid
methodology
air
Melting point
melting
temperature
Temperature
Thermodynamic properties
physical property
simulation
heat transfer
energy storage
Cryogenic energy storage
Heat transfer
Fluids
fluid
Hot Temperature

Keywords

  • Experimental melting point
  • LAES
  • Molten salt
  • Thermal energy storage
  • Thermo-physical properties

Cite this

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title = "Molten salt selection methodology for medium temperature liquid air energy storage application",
abstract = "Power production research in the recent years is moving towards renewable energy sources with the aim to reduce CO 2 emissions. A potential means to overcome the obstacles placed by the intermittent nature of the most common sustainable energy sources is represented by the Liquid Air Energy Storage (LAES)systems. In order to improve its round trip efficiency, which is currently at 50{\%}, the use of a common thermal medium for thermal storage and heat transfer fluid is considered as an effective solution. Molten salts were selected as the common thermal medium in this work, where a novel methodology for identifying and evaluating alternative mixtures is introduced. Firstly, various literature correlations were collected to form a thermo-physical property database of low melting temperature molten salts. These correlations were integrated in Aspen + by implementing a hybrid simulation technique for property estimation. These simulations were followed by a parametric analysis where 70 molten salt mixtures were evaluated in terms of thermo-physical properties by means of a performance and system index parameter. Following this process, 16 new molten salt mixtures were selected for the experimental campaign to measure their melting point temperature. As a result, two new alternative molten salt mixtures were found to have a low melting point of 95 °C and 105 °C, whilst providing a 37{\%} and 34{\%} increase in the performance indicator value. Hence, the presented methodology was proven to be an effective and versatile tool in identifying alternative salt mixtures, and can be adapted for comparable applications.",
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author = "Marco Bernagozzi and Panesar, {Angad S.} and Robert Morgan",
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Molten salt selection methodology for medium temperature liquid air energy storage application. / Bernagozzi, Marco; Panesar, Angad S.; Morgan, Robert.

In: Applied Energy, Vol. 248, 06.05.2019, p. 500-511.

Research output: Contribution to journalArticleResearchpeer-review

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