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 h = 6.5 Using the table below, select two alternative insulating materials that 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. W m² -K¨ Thermal range, "C Temperature conductivity, Density, 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 Elastomerie sheets 9 Fiberglass mats 10 Elastomeric preformed shapes 11 Fiberglass with vapor barrier blanket 12 Fiberglass without vapor barrier jacket 13 Fiberglass boards Application -240-1100 0.0015-0.72 Variable Many -180-150 16-20 25-48 Hot and cold pipes -170-110 16-20 32 110-150 Tanks and pipes 10-50 Tanks -200-200 29–108 -80-290 -170-230 -50-230 -40-100 60-370 22-78 25-86 32-55 36-39 30-55 36-39 10-50 10-50 70-100 Tanks 10-50 70-100 Pipe and fittings Pipe and pipe fittings Tanks and oquipment Piping Pipe and pipe fittings -40-100 -3-70 29-45 10-32 Refrigeration lines to 250 29-45 24-48 Hot piping 20-450 33-52 25-100 Boilers, tanks, heat exchangers 110-150 Hot piping 25-65 14 Cellular glass blocks and boards 15 Urethane foam blocks and boards 16 Mineral fiber preformed shapes 17 Mineral fiber blankets 20-500 100-150 29–108 16-20 Piping to 650 to 750 450-1000 230–1000 35-91 37-81 52-130 32-85 125-160 125 Hot piping Hot piping 175-290 Hot piping Hot piping, boilers, chimney linings 18 Mineral wool blocks 19 Calcium silicate blocks, boards 100-160 20 Mineral fiber blocks to 1100 52-130 210 Boilers and tanks

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
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Problem 1.1MA
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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
h = 6.5 . Using the table below, select two alternative insulating materials that
W
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,
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 Elastomerie sheets
9 Fiberglass mats
10 Elastomeric preformed shapes
11 Fiberglass with vapor
barrier blanket
12 Fiberglass without vapor
barrier jacket
13 Fiberglass boards
range, °C
Application
-240-1100
0.0015-0.72
Variable Many
-180-150
16-20
25-48
Hot and cold pipes
16-20
29-108
-170-110
32
Tanks
-200-200
110-150 Tanks and pipes
10-50
Pipe and pipe fittings
Tanks and equipment
Piping
-80-290
22-78
-170-230
25-86
10-50
-50-230
32-55
10-50
-40-100
36-39
70-100 Tanks
60-370
30-53
10-50
70-100 Pipe and fittings
10-32
Pipe and pipe fittings
-40-100
36-39
-5-70
29 45
Refrigeration lines
to 250
29–45
24-48
Hot piping
20-450
33-52
25-100 Boilers, tanks,
heat exchangers
14 Cellular glass blocks and boards
15 Urethane foam blocks and
29–108
16-20
110-150 Hot piping
25-65
20-500
100-150
Piping
boards
to 650
to 750
450-1000
16 Mineral fiber preformed shapes
17 Mineral fiber blankets
18 Mineral wool blocks
Hot piping
Hot piping
175-290 Hot piping
100-160 Hot piping, boilers,
chimney linings
Boilers and tanks
35-91
125-160
37-81
52-130
32-85
125
19 Calcium silicate blocks, boards
230-1000
20 Mineral fiber blocks
to 1100
52-130
210
Transcribed Image Text: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 h = 6.5 . Using the table below, select two alternative insulating materials that W 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, 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 Elastomerie sheets 9 Fiberglass mats 10 Elastomeric preformed shapes 11 Fiberglass with vapor barrier blanket 12 Fiberglass without vapor barrier jacket 13 Fiberglass boards range, °C Application -240-1100 0.0015-0.72 Variable Many -180-150 16-20 25-48 Hot and cold pipes 16-20 29-108 -170-110 32 Tanks -200-200 110-150 Tanks and pipes 10-50 Pipe and pipe fittings Tanks and equipment Piping -80-290 22-78 -170-230 25-86 10-50 -50-230 32-55 10-50 -40-100 36-39 70-100 Tanks 60-370 30-53 10-50 70-100 Pipe and fittings 10-32 Pipe and pipe fittings -40-100 36-39 -5-70 29 45 Refrigeration lines to 250 29–45 24-48 Hot piping 20-450 33-52 25-100 Boilers, tanks, heat exchangers 14 Cellular glass blocks and boards 15 Urethane foam blocks and 29–108 16-20 110-150 Hot piping 25-65 20-500 100-150 Piping boards to 650 to 750 450-1000 16 Mineral fiber preformed shapes 17 Mineral fiber blankets 18 Mineral wool blocks Hot piping Hot piping 175-290 Hot piping 100-160 Hot piping, boilers, chimney linings Boilers and tanks 35-91 125-160 37-81 52-130 32-85 125 19 Calcium silicate blocks, boards 230-1000 20 Mineral fiber blocks to 1100 52-130 210
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