Results 1 - 10 of 147
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[en] The possible energy characteristics of the LSF (large solar furnace with a capacity 1000 kW) based on numerical calculations are analyzed. The technical characteristics of the LSF are presented. The energy characteristics of the total system with different inaccuracies of the reflecting surfaces, energy contributions of certain shelves and groups of heliostats, and the contributions of certain heliostats and shapes of their focal spot are determined. Empirical formulas are proposed to describe the obtained numerical results. The problem of implementing the possible energy modes of the LSF with and/or without the inclusion of certain shelves and groups of heliostats is analyzed. The problem of a change in the energy density distribution in the focal spot of the LSF during the day is considered.
[en] The process of barium zirconate synthesis by the method of melting in solar furnace is studied, using barium carbonate and basic zirconium hydrocarbonate as initial materials, which makes it possible to produce one-phase barium zirconate
[en] The rotary-type solar furnace was developed and fabricated for solar hydrogen production by a two-step water splitting reaction using the special reactive ceramic. The rotary-type solar furnace is the dual cell solar reactor, which has two different type reaction rooms, one is for oxygen releasing reaction and the other is for hydrogen generation reaction. The detailed specification and the efficiency of the rotary-type solar furnace were examined. The reactive ceramics mounted on the cylindrical rotor in the rotary-type solar furnace was heated up to ca. 1623 K by a solar simulator. Successive evolutions of oxygen and hydrogen were observed in the oxygen releasing and water splitting reaction cells, respectively. Two-step water splitting process using newly developed rotary-type solar furnace was achieved. The optimum reaction temperatures of the oxygen releasing and hydrogen generation reactions with Ni,Mn-ferrite were 1473 K and 1173 K, respectively. (authors)
[en] This paper shows, how some Flat-Plate Solar Collector Characteristics can be determined, using a model and taking measurements like: inlet and outlet fluid temperatures, global solar radiation and water flux
[en] Full text: Main problem of polycrystalline silicon's manufacture is high cost and ecological harm. But from our point of view the problem could be decided. We have proposed the method of polycrystalline silicon's obtain by solar furnace. In most cases in solar furnaces oxide materials are generally synthesized and melt at open air; they are not made dirty or even made clearer of flying impurities because of absence of crucible, absence of heating elements and considerable temperature gradient in liquid phase. It is possible their cleaning at crystallization as well as a result of oxido reduction and evaporation of impurities. Solar furnace's concentrators with diameter of 1.5 m and that of 3.0 m and with vertical axle are reflectors. Principal scheme of solar furnace is presented. Waste products from metallurgical silicon (Ukraine, Zaporozhe) were starting material for cleaning of technical silicon. Relative content of starting silicon mark Kr.3 are presented as well. After clearing of metallurgical silicon by solar furnace X-ray examination by installation SPS-3000 has been carried out; precision of determination of content of residual impurity has been ∼10-4 %. It is shown, that after two-fold melt of metallurgical silicon content of impurities in it decrease for 3 %. Preliminary estimation of electrophysical parameters of the cleared polycrystalline silicon samples give as conductivity of n-type, n∼1.5·1017 cm; ρ∼0.12; μ∼470 cm2/v·s, τ∼4·10-6 s. The electrophysical parameters obtained at the experiment are almost the same that it is necessary of creation of devices of microelectronics and solar cells