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[en] The results of the EIR collector test series of the summers 1978 and 1979 are presented. In total, there are 37 different collectors available on the Swiss market. The results are compared with those from the IEA (International Energy Agency) of presuggested reference collectors. Test methods are described and also the construction of the test bench. Also, briefly described is a development method for the calculation of gross heat yield from solar collectors. Then the characteristics of the reference collectors in connection with the test periods are considered, and their role in the calculation of results of single collector test series explained. A description of the spectral photometer is given. (A.N.K.)
[en] The author presents tables of medium-usage solar collectors in connection with their characteristic values: optical efficiency during perpendicular light leak, and thermal loss factor for small differences between operating and external temperatures. With the aid of these data, each prospective buyer can quickly and easily determine the monthly gross heat yield for various collector types. (A.N.K.)
[en] The test results of the summer 1980 test on solar collectors are summarised. Apart from the 16 collectors tested under contract, two were investigated as a reference serving flat collectors, e.g. for the area of International Energy Agency (IEA), two were evacuated cylindrical collectors. The report allows the comparison of heat power outputs of the different products on the basis of the measured optical and thermal data values. (A.N.K.)
[en] Considering the state of the art for standardization a simulation model for calculating the heating demand for buildings as well as the demand for energy and fuels for the heating system and its carbondioxide emissions is presented and illustrated by examples. (author)
[en] Seasonal storage for solar energy have been the object of intensive theoretical studies and practical experiments. Within the frame of the research programme of the International Energy Agency 11 objects were set up and tested in practice. It was the aim of this research and demonstration projects to examine thermal long term storage for the use of solar energy and waste heat from industrial processes. In the following the actual state of the art of long term storage of solar energy for district heating in buildings will be described and possibilities of its use in Austria will be assessed. (author)
[en] The continuing glut of oil and low energy prices are putting the renewable energy sources (solar, wind power, etc.) in a quandary. Although being much more expensive than the conventional energy sources, the renewable sources bear the advantage of being much more compatible with the interests of the environment and society, so that politicians increasingly call for more financial support for the development of the renewable energy sources. A closer look at the problems involved in these new energy techniques, however, describes the politicians' approach to be rather blue-eyed. (orig.)
[de]Die anhaltende Oelschwemme und die niedrigen Energiepreise bringen die erneuerbaren Energien (Sonne, Wind etc.) zunehmend in Bedraengnis. Diese sind zwar um ein Vielfaches teurer als traditionelle Energiequellen, gelten aber als umwelt- und sozialvertraeglich. Immer mehr Politiker fordern deshalb zur Markteinfuehrung eine staerkere Subventionierung der erneuerbaren Energien. Eine solche Politik erweist sich allerdings bei genauerem Hinsehen als fragwuerdig. (orig.)
[en] The use of geothermal energy for space heating, process heat or for the production of electricity is associated with the production of large quantities of hot water or steam from boreholes. Most of it is reinjected into the ground after heat extraction in surface heat exchangers. The demand for such huge water volumes includes the following fundamental environmental risks: - A disturbance of the underground water balance; - Cooling of the subsurface; -Emission of gases and solution of minerals; - Release of heat; - Variation of the landscape. (orig./BWI)
[de]Bei der Nutzung von Erdwaerme fuer Raumheizung, Prozesswaerme oder fuer die Erzeugung elektrischen Stroms werden grosse Mengen heissen Wassers oder Dampfes aus Bohrungen gefoerdert und nach dem Durchlaufen eines oberirdischen Waermetauschers moeglichst wieder in den Untergrund geleitet. Die Entnahme dieser riesigen Wassermenge beinhaltet grundsaetzlich folgende Umweltrisiken: -Stoerung des Wasserhaushalts; - Abkuehlung des Untergrunds; - Emission von Gasen und Freisetzung von Mineralien; - Abwaerme; - Landschaftsschaedigungen. (orig./BWI)
[en] Decreasing energy costs from renewable sources could enable many African countries to make the leap into a clean future. This would save the continent the detour via the classic dirty sources.
[de]Sinkende Kosten fuer Energie aus erneuerbaren Quellen koennten vielen afrikanischen Laendern den Sprung in eine saubere Zukunft ermoeglichen. Damit wuerde sich der Kontinent den Umweg ueber die klassischen schmutzigen Quellen sparen.