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