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Facts and figures


  • Full name: Multi-functional light-weight WALL panel based on ADAPTive
    Insulation and nanomaterials for energy efficient buildings
  • Acronym: ADAPTIWALL
  • Duration: 48 months
  • Start date: 1 September 2013
  • Total budget: 5.05 M€
  • EC Funding: 3.35 M€

Adaptive Insulation System

The basic idea of the concept is to harvest solar energy on the building surface when it is available and transmit it into the indoor environment when it is needed. Thus to create a phase shift between the energy demand and supply. Some mandatory elements were given at the beginning of the work such as the surface available for heat exchange or the storage material.

From these initial conditions a development resulted in an adaptive insulation system which combines static heat insulation by a thermodynamic component. Outside plate collector harvests solar energy to transmit it to the buffer while a second loop is responsible of heat transmission to indoor environment when needed.

4 lab-scale prototypes were built in Spain, at Algete Demo Park of ACCIONA, for experimental assessment of thermal behaviour of the concept. The main technical elements of the system are the outside plate (l) and the inside plate (r) in the picture below.

outside inside plate

Communication between CEA in France and ACCIONA in Spain was established for data transmission and to deploy different control strategies on the prototypes.

 communication CEA ACC

First results show the “proof of concept”: energy is transmitted from the outside facade to the inside heat storing buffer of the ADAPTIWALL. Next step concerns the upscaling of the concept on real-size demonstration level, where the system must work under real weather conditions in two room sized experimental test cell. Here the actual contribution to energy savings is assessed.