The Development and Qualification of Thermal Control Coatings for Snap Systems Page: 58 of 75
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The c and s/E relationship for the composite heat shield surface is:
E (composite) = (0.44 x E) Alodine
.. (12)
+ (0.54 x E) Silicone + (0.02 x E) Laquer;
as(composite) = (0.44 x as) Alodine
..(13)+ (0.54 x as) Silicone + (0.02 x as) Laquer.
From Equations 12 and 13, the composite E and a s/E values are:Composite Surface
Condition
As-Received
Coatings
Coatings Subsequent
to Weathering
Coatings Subsequent to
Vacuum, Temperature
Stability TestThermal Emittance
0.200.18
0.18Solar Absorptance
To Thermal Emittance Ratio
1.651.83
1.83Using these radiation properties and shield areas, an analysis was per-
formed (at 6% NaK flow) to determine the coolant system temperatures. A
summary of these results are tabulated as:Condition
Sun-shade
Constant Su..-
constant shadeTime
(hr)
15
1st
orbit
8
1st
orbitNaK (Max.)
(OF)
164NaK (Min.)
(*F)Reactor Outlet
Max. (*F)
115.261.5
218
160.9
65.4
Note, tiat the NaK temperatures attained are within the required limits.
NAA-SR-9908
54
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Crosby, J. R. The Development and Qualification of Thermal Control Coatings for Snap Systems, report, September 30, 1965; Canoga Park, California. (https://digital.library.unt.edu/ark:/67531/metadc1028869/m1/58/: accessed July 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.