0.30
0.28
0.26
0.24
0.22
k = 0.000536829T + 0.214583
0.20
20
0
20
40
60
80
100
120
140
Mean Temperature (F)
Figure 15. Thermal conductivity of expanded polystyrene.
Removable
Lid
Schedule 40
Pipe
11 in.
Heat Transfer Paste
Insulation and Plywood
Inner EPS Insulation
Outer Cover
(0.5 in.)
Glued to Plywood
Cooling Panel
(all 4 sides)
Plywood (0.5 in.)
Figure 16. Schematic cross section of the 1-ft 1-ft apparatus.
exterior of the apparatus was insulated and covered with plywood. Figure 16 is a
cross section of the design.
Initial tests were done in CRREL's Frost Effects Research Facility (FERF), which
supplied a glycol solution as cold as 22F to the apparatus. During these initial
tests, it was determined that significantly colder coolant temperatures would be
required to obtain temperatures typical of Alaska design conditions (65F for out-
door air temperature) and to obtain near-freezing temperatures within the enclo-
25
Back to Contents
Previous Page
