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

I ,
of the ampoule. It is important to note that radial stresses are
I 4
negative.
The ampoule safety coefficient is
: It I
al max
generalized stress a is
found from the formula for the threedimensional
stressed state:
J/0,5[(,,- '
,z) 2 +(z 1.. (2_. 89)
The safety coefficient should be n = 1.1-1.2.
2.3. SOLAR ENERGY CONCENTRATORS FOR AN ERE
We know that the sun radiates tremendous energy. The density
of the solar energy flux beyond the earth's atmosph*ere '(called the
solar constant) is S = 1.4 kW/m 2 , and near the earth's surface at
the equator reaches 1 kW/m 2 .
A flat. surface is the simplest solar energy redeivpr. Mirror
concentrators give grea't density of solar energy and, particularly,
of thermal solar energy.
F'ig. 2.65. Diagrams of stresses
in ampoule walls.
The effectiveness of a concentrator is
determined by the solarray
concentration coeffir-ien'. n, whi.,h is equal to, the, ratio of,
the thermal flux in
from space. The value of is 80-2000.
201
the !ollector trap to the solar flux S incoming
201