Time filter

Source Type

Koln, Germany

Janotte N.,German Aerospace Center | Lupfert E.,German Aerospace Center | Pitz-Paal R.,German Aerospace Center | Pottler K.,Institute of Technical Thermodynamics Solar Research | And 3 more authors.
Journal of Solar Energy Engineering, Transactions of the ASME | Year: 2010

Parabolic trough concentrating collectors play a major role in the energy efficiency and economics of concentrating solar power plants. Therefore, existing collector systems are constantly enhanced and new types were developed. Thermal performance testing is one step generally required in the course of their testing and qualification. For outdoor tests of prototypes, a heat transfer fluid loop (single collector or entire loop) needs to be equipped with measurement sensors for inlet, outlet, and ambient temperature as well as irradiance, wind speed, and mass or volumetric flow rate to evaluate the heat balance. Assessing the individual measurement uncertainties and their impact on the combined uncertainty of the desired measurement quantity one obtains the significance of the testing results. The method has been applied to a set of EuroTrough collector tests performed at Plataforma Solar de Almería, Spain. Test results include the uncertainty range of the resulting modeling function and exemplify the effects of sensors and their specifications on the parameters leading to an uncertainty of ±1.7% points for the optical collector efficiency. The measurement uncertainties of direct normal irradiance and mass flow rate are identified as determining uncertainty contributions and indicate room for improvement. Extended multiple sensor deployment and improved calibration procedures are the key to further reducing measurement uncertainty and hence increasing testing significance. Copyright © 2010 by ASME. Source

Laing D.,German Aerospace Center | Steinmann W.D.,German Aerospace Center | Viebahn P.,German Aerospace Center | Viebahn P.,Wuppertal Institute for Climate | And 2 more authors.
Journal of Solar Energy Engineering, Transactions of the ASME | Year: 2010

For parabolic trough power plants using synthetic oil as the heat transfer medium, the application of solid media sensible heat storage is an attractive option in terms of investment and maintenance costs. One important aspect in storage development is the storage integration into the power plant. A modular operation concept for thermal storage systems was previously suggested by DLR, showing an increase in storage capacity of more than 100%. However, in these investigations, the additional costs needed to implement this storage concept into the power plant, such as for extra piping, valves, pumps, and control, had not been considered. These aspects are discussed in this paper, showing a decrease in levelized energy costs with a modular storage integration of 2-3%. In a life cycle assessment a comparison of an AndaSol-I type solar thermal power plant with the original two-tank molten salt storage and with a "hypothetical" concrete storage shows an advantage of the concrete storage technology concerning environmental impacts. The environmental impacts of the hypothetical concrete based AndaSol-I decreased by 7%, considering 1 kW h of solar electricity delivered to the grid. Regarding only the production of the power plant, the emissions decreased by 9.5%. © 2010 American Society of Mechanical Engineers. Source

In an expansion system (

Flagsol GmbH | Date: 2011-10-11

Common metals and their alloys; metal building materials, namely, torque tubes, pylons in the nature of structural beams and poles, pipe support bridges, metal counter weights, soffits, fascia, ceiling boards and floor boards; transportable buildings of metal; materials of metal for construction of railway tracks; non-electric cables and wires of common metal; small items of metal hardware for supporting structures, namely, pipe supports, cantilever arms, pipe bearings; pipes and tubes of metal; metal safes; hardware of common metal, namely, connection bolts, nuts, washers, anchor bolts, iron ores. Photovoltaic cells for electricity generation also including a solar thermal collector sold as a unit. Solar thermal installations, namely, solar thermal modules including parabolic mirrors designed for solar energy and structural components therefor sold as a unit; solar thermal collectors for heating. Non-metal pipes and pipe groups for solar thermal installations. Electronic data processing consultancy in connection with the marketing, production, installation and maintenance of machines for pumps, solar installations, solar thermal installations, photovoltaic installations, photovoltaic modules and renewable energy generation installations. Planning and consultancy for building construction; installation, maintenance and repair of energy production installations and machines, in particular solar thermal and photovoltaic installations. Building and construction drafting and architectural consultancy, providing technical planning and product research and development, all the aforesaid services in connection with the construction of energy production installations, in particular solar thermal and photovoltaic installations.

Flagsol GmbH | Date: 2010-02-19

The invention relates to a feed water degasifier comprising a degasifier (

Discover hidden collaborations