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Physical Storage
BMWi
Phase-change material (PCM) 11.4.2017

Examples for 3D wire structures
© Fraunhofer IFAM Dresden

Increase dynamism with three-dimensional wire mesh

To equip modular storage units for a temperature range of 150 to 350 degrees Celsius and achieve high energy and power densities at the same time, is the declared aim of the researchers in the MOSPEDRA-project. The scientists first need to increase the dynamics of the memory modules. They want to achieve with a new metallic thermal wire mesh, which is embedded in a phase-change material.

Project status Near completion
Type of storage Latent heat storage (salt)
Research objective Storage material, modular storage construction and heat exchanger
Charging and discharging heat exchanger
Temperature type high temperature
Storage/Charging indirect
Storage time short (hours to days)
Number of cycles > 35.000
Charging temperature 150 bis 350 °C
Discharge tempareture 150 bis 350 °C
Energy storage density ~ 400 MJ/m³
Project duration April 2014 until June 2017

The energy storage system developed in this project using phase changed materials to buffer process heat. The storage system based on a phase change material like molten salt and salt mixtures (for a temperature over 250 °C) and integrated 3D wire structure – called strucwire – to increase the heat conductivity of the whole system.

Wire mesh integrated into PCM

The wire structures are open cellular metals and increase the heat conductivity of the PCM material and thereby the process times of the entire storage system.

  • Energy storage system with high power density and rapid process times
  • Phase change materials (salt) ; 3D wire structures
  • Aim: reconcilation of all material components; good heat conductivity and corrosion resistance
  • 3D wire structures, brazed between two plates © Fraunhofer IFAM Dresden
  • Possible Configuration of a 3D wire structure-PCM heat storage system © Fraunhofer IFAM Dresden
  • left: energy capacitaties and melting points of PCMs; right: estimation for the heat conductivity of 3D wire structures © Fraunhofer IFAM Dresden
  • Examples for 3D wire structures © Fraunhofer IFAM Dresden

Research focus and optimisation

Usage of open cellulare metals in form of 3D wire structures to increase the heat conductivity of  the PCM salts:

  • fast PCM storage systems
  • short cycle times
  • modular construction (individual)
  • using simulation software (COMSOL)

Sub-projects

  • Statement of requirements for the storage systeme
  • Development and manufactoring of 3D wire structures including coating und brazing
  • Corrosion testing and establishing of relevant facts and material regularities
  • Energy storage simulations
  • Buildup of a testing-setup for first specimens
  • Testing and  iterative improvement
  • Evaluation compared with a technical and economical rating
Supported by: The Federal Government on the basis of a decision by the German Bundestag

Dates

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Infobox

Research funding

The information system EnArgus provides information on research funding, including on this project (German only).