Phase Change Materials in wall integrated systems

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Phase Change Materials in wall integrated systems
Thomas Haussmann, Dr. Hans-Martin Henning, Peter
Schossig Fraunhofer-Institut für Solare
Energiesysteme ISE Annex 17, 2.
Workshop Ljubljana 4-5. April 2002
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The project is supported by the german ministry
for economic affairs (BMWi). Partners are
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Structure

• general concept of PCM in construction materials
• assessment of the potential by building
  simulation
• measurements with wall test samples
• measurements in real buildings (ISE)
• measurements of test-rooms
• summary outlook

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General structure

• Possible products
• paints
• plasters
• boards
• pasteuse products

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SEM-Picture
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Potential of PCM layers on internal walls
future
Fraction of heavy concrete wall thickness to
PCM-wall thickness with the same thermal
mass assumed ?T 4 K
status
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Parameters for building simulation

• climate
• building thermal mass (light/heavy)
• building component properties (insulation,
  windows, shading, ...)
• load profile (internal loads, ventilation regime,
  ...)
• properties of the phase change material
• amount
• melting point
• enthalpy of melting solidification

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Scheme of the simulated office segment (ESP)
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Example of simulation results (wall temperature)
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Example of simulation results (operational
temperature)
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Results of the parameter study

• promising application seems
• light weight buildings
• reduction of overheating during summer
• correct selection of melting point is sensible
• reasonable effects are seen with technically
  feasible approaches
• important discharge of the storage during
  night (ventilation)

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Experimental setup
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Experimental setup (2)
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Experimental result (constant heat flux)
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Enthalpy function resulting from experiments
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Experimental investigation of real application

• 2 test cells with windows and ventilation
• 3 offices in new Fraunhofer ISE building

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Mounting of pcm-plaster in offices at ISE
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First results at ISE
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Measurements of test cells
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Summary

• micro-encapsulated phase change materials
  integrated into building components have the
  potential for energy savings and increased indoor
  comfort
• to date reduction overheating in summer seems
  most feasible
• to take effect storage discharge during night by
  ventilation is very important
• our work comprises
• Material testing (DSC, SEM)
• accelerated aging
• measurements of wall samples
• measurements of test cells
• measurements of real buildings
• building simulation (ESP-r, ColSim)

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Outlook

• further steps
• experimental studies in real applications
• validation of simulation-models with test-cell
  data
• further improvement of material properties
  (higher enthalpy)
• development of new applications
• other PCM-activities at ISE
• PCM-Slurries (EU-Project PAMELA)
• PCM-HYPOKAUSTEN