Design and Stress Analysis of Extraterrestrial ... - The Black Vault

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The quality of the device for'concentration and reception of
solar energy is defilned as the quantity of efficiency n..C,:which
is the produdt of the efficiency of the mirror and the efficiency
of! the concentrator trap. The effecinyy of the mirror is equal
to the ratio of the energy incident on the trap to the energy
incident on the mirror. The energy of the Itrap is equal to the
ratio of the outgoing trap energy to t6e incident trap energy. The
energy of the solar cgncentraftor for various de'signs and conditions
is OH 3-o,8.
We can show the following vaiues for the- specific masseý of
metal concentrators: y =.0.9-11.6• g/i
The;specifid power of solar concentrators for these types at
ja trap wall temperatur'e of 800-20000C is :N
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The construption of solaV concentrators is
= 0.1-0.4 kW/kg.
simple but they do
havelsomeshdrtcomings: the basic design element - the mirror -
loses reflecting capacity d'urig operation due to surface damage;
&the concentrator does not operate.when shaded; it is not- expedient
to use such construction for powers above 20 kW because of its
large mass and cumbersome nature.
Basýed on structural form; all solar concentrators can be divided
into nonfolding and folding. 'Based on the shape of the mirror's
surface, cohcentrators are broken down into parabolic, conical
(Fresnel mirror) and 3 sphpricil.
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Structural diagrams of solar concentrators
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Figure 2.66a is a diagram of a nonfolding solar concentrator
with a conical mirror,striace..
The concentrator consists of h mirror 1 which is formed by
ring-shaped conical surfaces, a mirror base 2 which is the structural
force element holding the mirror to the steel power plant, a force
ring,3, three rdds 4', and. a thermal! trap 5. This design is the
simplest and can serve as an auxiliary, comparatively low-power,
energy source.
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