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    Bee and bumblebee begin field tests

    As part of a joint project with Vattenfall and ZAE Bayern, scientists from the TU Berlin have developed two new absorption chillers. The 50-kW unit, which the researchers have nicknamed Bee, and the larger 160-kW unit called Bumblebee use heat at a low temperature level for generating cooling energy. The prototypes are smaller, lighter and more powerful than comparable systems on the market. A field test is now starting.  more...
    Projektinfo 06/2013

    The supermarket of the future saves energy

    The energy savings division at the discount store Aldi Süd in Rastatt should in the future only need two-thirds of the primary energy usually required for refrigeration, heating, ventilation, air conditioning and lighting. A compressor pack with carbon dioxide as a coolant which has been developed in-house, and which is coupled to borehole heat exchangers, not only cools food, but also provides temperature control for indoor areas.  In the third year of operation, the amount of energy consumed is coming close to the ambitious target levels.  more...
    Projektinfo 03/2013

    Energy-efficient finishing in mechanical engineering

    When producing machine components, the grinding stage is a production process with comparatively low energy efficiency. Up to 90% of the energy deployed is released as frictional heat. Large amounts of lubricants and coolants flood the workpieces and tools to cool them. The supply of coolants and their processing require enormous expenditure, including in terms of the energy. Researchers from industry and science have therefore jointly developed new processes that produce significant savings potential with minimum lubrication.  more...

    Phase change stores heat

    When it comes to transporting heat from boilers to heating surfaces or supplying cooling energy to cooling ceilings, water has proved to be an excellent heat transfer medium. However, in some application areas it is now facing competition: various research groups are working on heat transfer fluids that have at least double the energy density. Phase change materials such as paraffin, which are finely distributed in water, store heat when they melt and release it again when they solidify.  more...

    Using solar roofs twice over

    Instead of screwing various module and collector types for solar power and solar heat on the roof, an obvious idea would be to use a hybrid collector that can do both and which creates a uniform appearance. In addition to generating photovoltaic electricity, which only utilises 15-20 % of the incident solar radiation, a so-called PVT collector can use the remaining radiation energy for generating heat. Researchers are working on optimising the output and production of these systems.  more...

    Cooling with heat

    The economic and ecological success of many CHP plants, district heating networks and large-scale solar power systems very much depends on the utilisation of heat outside of the heating periods. An increasingly interesting market for low-temperature heat is cooling and air-conditioning buildings as well as generating process cooling energy with thermally driven chillers. Scientists from Berlin and Bavaria have developed a new generation of particularly compact, efficient absorption chillers with small capacities for cooling and heating operations.  more...

    Supermarket refrigeration using carbon dioxide

    Researchers from the Technical University of Dresden have succeeded in significantly improving the efficiency of chillers that use carbon dioxide as a refrigerant. One possible application of their system is in refrigeration for supermarkets, where cooling is required for equipment ranging from refrigerated display cases right through to large cold storage rooms. The researchers expect average annual energy savings of 10% compared to conventional refrigeration systems, with savings of up to 25% on warm days. The researchers are cooperating with an industrial partner to obtain initial operating experience with these systems.  more...

    Highly-efficient flow of current

    Copper cables only conduct electricity under resistance, meaning the cable heats up and energy is lost. In contrast, superconductors conduct electricity without loss. Their use in cable and generator projects thus increases the efficiency of the electricity supply infrastructure. With this in mind, the German Federal Ministry of Economics and Technology is promoting the cost-effective production of superconductive band conductors at the manufacturer Zenergy Power with funding of 3.5 million euros.  more...

    More efficient heating and cooling with salt

    The Absorber Box by Watergy, a company from Berlin, Germany, uses humid air as a source of energy. The air conditioning system can heat or cool air, thus controlling the humidity and temperature using a saline solution for intermediate storage, which saves energy. The project, supported by funding from the German Federal Ministry of Economics and Technology, is now in the market for beta-testers.  more...

    Zeolite/water refrigerators

    Researchers at Zeo-Tech GmbH in Unterschleissheim, Germany, have developed freezer boxes and mini refrigerators for mobile and stationary use that are designed to operate more efficiently in their respective application areas than current technology allows. As it is powered by heat, the adsorption-based cooling process can utilise a range of different energy sources. Mobile freezer boxes are already being tested in practice. Once they are charged via a normal power socket, they can be stored loss-free until used, when the cooling process is started at the touch of a button. After a short cooling time they reach deep freeze temperatures which are maintained over 24 hours.  more...



09.10.2014 - 12.10.2014


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