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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 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

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

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter2: Steady Heat Conduction
Section: Chapter Questions
Problem 2.24P
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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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