Deutsche Version  ACT
Thermal Storage
Smart Grid 13.7.2016

Overview plan of work and tasks
© BSH Hausgeräte GmbH

Household appliances store heat

When refrigerators, washing machines or dishwashers store heat

temporarily, they require less energy and can transfer their power

consumption partly in low-load periods. A manufacturer of household

appliances develops concepts for such products in cooperation with

project partners from industry and research. The focus is on latent heat


Project status Project completed
Project duration July 2013 until June 2016
Type of storage Latent heat storage
Research objective storage material, storage construction (specially designed for integration into of household appliances), Components for charching and discharching (heat exchanger)
Storage/Charging direct
Number of cycles > 5500
Storage time short (hours to days)
Charging temperature -10 to +85 °C
Discharge temperature -10 to +85 °C
Storage capacity > 150 kJ
Energy storage density 200 kJ/m³

Development targets are reduction of energy consumption and increase of load shifting potentials of household appliances. To reach this target special polymer-bound PCM storage materials have to be developed and characterized. Additionally appliance components have to be manufactured based on these materials. The storage materials have to be integrated in dryers, dishwashers and refrigerators and the appliance processes have to be adjusted to the integrated storage systems.

  • Demand load optimization © BSH Hausgeräte GmbH
  • Overview plan of work and tasks © BSH Hausgeräte GmbH

Material development and optimization is carried out by the project partner TITK. ILK Dresden will develop heat storage components in close cooperation with the individual BSH product divisions, test and integrate them into the household appliances. The tast of ILK Dresden include the design of the components , their thermal and mechanical characterization, cycle and lifetime tests as well as work in the integration of the heat- storing components in the equipment and in adapting the process steps in home appliances .

Household appliances compensate for peak loads

The need of positive and negative controlling power range will continue to rise due to the increasing use of renewable energy sources. Thus there is an urgent need for action in the search for alternatives.
One important approach in the context of a comprehensive , adaptable power supply system is the use of energy storages to compensate for peak loads and energy production peaks. Here , the use of distributed enrergy storages directly located at the consumers is a promising possibility to synchronize supply and demand.

In addition to the storage of electricity, thermal energy storage can be used anywhere, where electricity is generated from heat or cold. Appliances such as refrigerators, dryers and dishwashers are among the largest energy consumers in residential households. Especially because of their high market penetration they offer a great opportunity for storing thermal energy. By a thermal storage system, the given cooling and heating demand of the appliances will be transferred into a time sliding load on the power grid , which is made available in the framework of this project.

The potential shiftable load of todays state of the art houshold appliances is limited to about 60 minutes. With new thermal storage systems integrated into the devices, the shift duration can be significantly longer.


  • TITK: material development and optimization
  • ILK Dresden: development of heat storage components
  • BSH: Storage processes and functional models

Work plan

The work plan is broken down as follows:

  1. Concept for Product ideas
    07/2013 - 07/2014
  2. User specific Material development, characterization and selection
    08/2013 - 06/2015
  3. Process development for the PCM production
    08/2013 - 12/2015
  4. Components and functional prototypes
    11/2013 - 12/2015
  5. Testing and demonstration and project finalization
    10/2014 - 05/2016

Milestones are located at the end of each work package.

Supported by: The Federal Government on the basis of a decision by the German Bundestag


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Research funding

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