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    Combining compost and biogas

    A new method improves the energy balance and processing capacity of composting plants. With the usual composting process, considerable energy is consumed to provide the required mechanical ventilation. In the new method, the liquid organic components of the organic waste are separated in advance and are used for producing biogas. This enables energy to be generated in the plants. For the project, a new biofilm digester has been designed which provides cost advantages relative to other digestion processes.  more...
     
    Projektinfo 16/2014

    Fresh air for new school buildings

    A school where you feel at home that at the same time consumes little energy during operation – that is the Niederheide primary school in Hohen Neuendorf. A ventilation system which combines mechanical and natural ventilation via the windows ensures a good air quality and a pleasant indoor environment in the classrooms. It is the first school in Germany to receive the Gold Medal for Sustainable Construction. It was certified in accordance with the Sustainable Construction Assessment System (BNB) developed by the Federal Ministry for the Environment, Nature Conservation, Building and Nuclear Safety (BMUB).  more...
     

    Fast-track testing of nacelles

    In Bremerhaven, a test rig is being developed that can test complete wind turbine nacelles in the multi-megawatt class. Unprecedented: a load transmission system mechanically simulates the wind loads occurring in the field. The researchers are investigating the electrical components using a simulated electricity grid. Laboratory tests are also providing information on how wind turbine concepts can be improved. With these properties, the test rig has the world’s most powerful grid simulation system.  more...
     
    Projektinfo 14/2014

    Vacuum tank stores heat

    An efficient long-term heat storage tank boosts the shares of fraction of solar thermal energy systems in buildings. Staff at Bavarian Center for Applied Energy Research and at steel and metal engineering company Hummelsberger have developed a storage system that minimises thermal losses and optimises temperature stratification. A vacuum between the inner and outer tank combined with a perlite powder filling reduces the thermal conductivity of the storage tank shell.  more...
     

    Making district heating renewable

    Three research teams have investigated how the proportion of renewable energies can be increased in district heating networks. Custom strategies were developed in this respect for the model regions Jena and Ulm. The key lay in identifying the appropriate renewable energy sources and in understanding the potential these exhibit and the effect their inclusion would have on the efficiency of the networks. The project also comprises a survey of existing heat networks with best practice analyses.  more...
     

    Saving energy in commercial and industrial parks

    Industrial parks are typically home to a diverse mix of cross-industry businesses. The requirements of these businesses vary when it comes to energy supply depending on the nature of their production. For businesses in the metal processing industry for instance, thermal energy requirements in the range of many hundreds of degrees Celsius are typical, while in the food industry, heat requirements are rarely above a hundred degrees Celsius. Businesses operating in the direct vicinity can make good use of waste heat from such processes.  more...
     

    Clean use of landfill gas

    In the production of landfill gas, other gases are produced alongside the desired methane that damage motors and turbines. To protect these plant components, trace compounds of organic silicon contained in the gases are separated beforehand, e.g. by means of adsorption. The high consumption of the adsorbent, however, endangers the efficiency of the process. A research team has developed an on-site regeneration method for the adsorbent. This can increase the efficiency of the energy recovery of landfill gas.  more...
     

    Creating microclimates in ovens

    Fan-forced or convection ovens can be found today in many households. They work very efficiently if they are used for longer baking or roasting processes and are fully loaded. However, the devices are not optimised for preparing snacks or small dishes with a short cooking time. In the “ecoBack” project, researchers are investigating how a microclimate adapted to the food can reduce the energy requirement.  more...
     

    Energy from waste water supplies urban district

    Using waste water with organic substrates to produce biogas makes it possible to meet a large part of the electricity and heat demand in urban districts. This is being implemented on the site of former army barracks in Hamburg. This is where the new Jenfelder Au urban neighbourhood is being created with around 770 residential units. The drainage and energy concept provides for separate drainage of the domestic sewage already within the buildings and the conversion of the black water into biogas. The aim is to supply CO2-neutral heating.  more...
     

    Stabilising the grid with wind power

    In future it is intended that photovoltaic systems and wind farms contribute more to the stability of the electricity grid. They could then replace some of the fossil fuel capacities that until now have had to be used for the sole purpose of balancing out frequency variations. In a study, methods have been developed that can be used for intermittent renewable energies when bidding to supply control reserve as part of regular tendering periods.  more...
     

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