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 Good insulation practices require the following:
o
All exterior joints must be sealed and protected, including
those between the insulation and collectors, and roof
penetrations.
o
Pipes must be supported on the outside of the insulation,
using saddles to distribute the piping weight without
crushing the insulation.
o Pipe supports must allow piping and insulation to move
during periods of thermal expansion and contraction
without tearing the insulation.
TABLE 2-2: Typical Solar Pipe Insulations
Notes on use
Material
R-value
Trade
Name(s)
(per in.)
Must be protected
Fiber glass
CertainTeed
4.0
from moisture,
joints are difficult
to fabricate,
Max. temp. is 300F
May require two
Armaflex
Closed cell
3.5
layers, does not need
flexible
Rubatex
moisture protection,
elastomeric
must have UV pro-
foam
tection, max. temp.
is 220F
Must have UV and
Solar-7
Closed cell
6.5
moisture protection,
rigid
to
lnsultek
max. temp. is 250F
urethane
7.0
lnsulsleeve
and poly-
isocyanurate
foams
OPERATION
48
2.7 COMPONENT OPERATION
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