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)|
|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.
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
The work plan is broken down as follows:
- Concept for Product ideas
07/2013 - 07/2014
- User specific Material development, characterization and selection
08/2013 - 06/2015
- Process development for the PCM production
08/2013 - 12/2015
- Components and functional prototypes
11/2013 - 12/2015
- Testing and demonstration and project finalization
10/2014 - 05/2016
Milestones are located at the end of each work package.