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Publication Type: search.filters.UBSTyp.KonferenzbeitragStart date: 1979End date: 1979Subject: search.filters.subject.333.7

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    Effect of buoyancy on the flow and temperature fields near injection wells
    (1979) Mehlhorn, Hans; Kobus, Helmut
    The injection of heated water into a ground water stream of constant velocity is studied. The heated water is discharged through a fully penetrating injection well into a confined aquifer of constant thickness. For steady state conditions and under the assumption that heat conduction and dispersion in the aquifer and through the confining layers are negligible in comparison to the convective heat transport, it is shown that the flow and temperature field is dependent on the relative infiltration rate and on the relative buoyancy of well discharge. First results of a steady-state three-dimensional numerical model are given.
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    Central versus decentral energy supply strategies for industrialized countries - soft or hard energy strategies?
    (1979) Düring, Klaus; Kollmann, Helmut; Oesterwind, Dieter; Orth, Detlef; Voß, Alfred
    Of late, the discussion about alternative ways of securing our future energy supply has received a new impulse by the introduction of the catchphrase "soft energy". This catchphrase is exemplary for widely-applied socio-political criticism of the general development of technology towards industrialized technology and for the pursuit of alternative life styles signified by decentralized, comprehensible technology. With reference to the field of energy, this is to be interpreted as the concept of an energy supply in which power is produced by a number of smaller plants at the point of consumption, and which for the main part makes use of regenerative energy sources, such as sun and wind and biomass.
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    The impact of new technologies on the future energy supply
    (1979) Bohn, Thomas; Voß, Alfred
    The foreseeable depletion of the oil and gas resources have pointed out may lead to a situation where supply cannot satisfy demand as soon as in the late eighties, requires a fundamental change of our energy supply pattern. The key technical issues lying ahead are the timely utilisation of new energy sources, the development of new technologies which increase the application and substitution potential of coal and nuclear energy, and last, but not least, to implement measures and technologies which make better use of the energy. In the industrialised countries, a broad spectrum of new energy production, conversion, transport, storage and end-use technologies is being developed. The most relevant of these technologies are described in this report and use the case of the Federal Republic of Germany in their present state of development; their supply and substitution potential and their economic aspects are discussed.
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    Hydraulic design considerations for cooling tower collector basins
    (1979) Kobus, Helmut; Westrich, Bernhard
    Conventional collector basins of natural draft cooling towers have a tendency towards rapid sedimentation. In order to avoid this problem, a shallow type of basin with a system of draining canals is developped. Numerical calculations supplemented by hydraulic model tests yield depths, velocities and energy losses in the system. Prototype measurements are shown to be in good agreement with numerical and experimental predictions for all modes of operation.