A pipe having an outside diameter of 6 cm is maintained at 200°C by steam flowing inside. The pipe passes through a large factory area and loses heat from the outside with W h 6.5 Using the table below, select two alternative insulating materials that m2-K could be installed to lower the outside surface temperature of the insulation to 30°C, when the pipe is exposed to room air at 20°C. Find also the temperature in between the two insulation

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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A pipe having an outside diameter of 6 cm is maintained at 200°C by steam flowing inside. The pipe passes through a large factory area and loses heat from the outside with W h 6.5 Using the table below, select two alternative insulating materials that m2-K could be installed to lower the outside surface temperature of the insulation to 30°C, when the pipe is exposed to room air at 20°C. Find also the temperature in between the two insulation.

Thermal
Temperature conductivity,
Density,
range, °C
mW/m -°C
kg/m³
Туре
I Linde evacuated superinsulation
2 Urethane foam
3 Urethane foam
4 Cellular glass blocks
5 Fiberglass blanket for wrapping
6 Fiberglass blankets
7 Fiberglass preformed shapes
8 Elastomeric sheets
9 Fiberglass mats
10 Elastomerie preformed shapes
11 Fiberglass with vapor
barrier blanket
Application
-240–1100
0.0015-0.72
Variable Many
-180-150
16-20
25 48
Hot and cold pipes
16-20
29-108
22-78
-170-110
32
Tanks
110-150 Tanks and pipes
Pipe and pipe fittings
Tanks and equipment
Piping
Tanks
-200-200
-80-290
10-50
25-86
32-55
-170-230
10-50
-50-230
10-50
-40-100
36-39
70-100
60-370
30-55
36-39
10-50
Pipe and pipe fittings
Pipe and fittings
Refrigeration lines
-40-100
70-100
-5-70
29-45
10-32
12 Fiberglass without vapor
barrier jacket
13 Fiberglass boards
to 250
29-45
24 48
Hot piping
20-450
33-52
25-100
Boilers, tanks,
14 Cellular glass blocks and boards
15 Urethane foam blocks and
20-500
100-150
110-150
25-65
heat exchangers
Hot piping
Piping
29-108
16-20
boards
Hot piping
Hot piping
Hot piping
100-160 Hot piping, boilers,
chimney linings
Boilers and tanks
16 Mineral fiber preformed shapes
17 Mineral fiber blankets
to 650
35-91
125-160
to 750
37-81
125
18 Mineral wool blocks
450-1000
52-130
175-290
19 Calcium silicate blocks, boards
230-1000
32-85
20 Mineral fiber blocks
to 1100
52-130
210
Transcribed Image Text:Thermal Temperature conductivity, Density, range, °C mW/m -°C kg/m³ Туре I Linde evacuated superinsulation 2 Urethane foam 3 Urethane foam 4 Cellular glass blocks 5 Fiberglass blanket for wrapping 6 Fiberglass blankets 7 Fiberglass preformed shapes 8 Elastomeric sheets 9 Fiberglass mats 10 Elastomerie preformed shapes 11 Fiberglass with vapor barrier blanket Application -240–1100 0.0015-0.72 Variable Many -180-150 16-20 25 48 Hot and cold pipes 16-20 29-108 22-78 -170-110 32 Tanks 110-150 Tanks and pipes Pipe and pipe fittings Tanks and equipment Piping Tanks -200-200 -80-290 10-50 25-86 32-55 -170-230 10-50 -50-230 10-50 -40-100 36-39 70-100 60-370 30-55 36-39 10-50 Pipe and pipe fittings Pipe and fittings Refrigeration lines -40-100 70-100 -5-70 29-45 10-32 12 Fiberglass without vapor barrier jacket 13 Fiberglass boards to 250 29-45 24 48 Hot piping 20-450 33-52 25-100 Boilers, tanks, 14 Cellular glass blocks and boards 15 Urethane foam blocks and 20-500 100-150 110-150 25-65 heat exchangers Hot piping Piping 29-108 16-20 boards Hot piping Hot piping Hot piping 100-160 Hot piping, boilers, chimney linings Boilers and tanks 16 Mineral fiber preformed shapes 17 Mineral fiber blankets to 650 35-91 125-160 to 750 37-81 125 18 Mineral wool blocks 450-1000 52-130 175-290 19 Calcium silicate blocks, boards 230-1000 32-85 20 Mineral fiber blocks to 1100 52-130 210
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