Barrel Heaters - Hasmak.com.tr

W A T L O WReference DataHeat Loss Factorsand Graphs1. Based upon <strong>com</strong>bined natural convectionand radiation losses into 21°C (70°F)environment.2. Insulation characteristicsk = 0.67 @ 93°C (200°F)k = 0.83 @ 537°C (1000°F)3. For molded ceramic fiber products andpacked or tightly packed insulation, losseswill be lower than values shown.For 2 or 3 inches Insulation multiply by 0.84For 4 or 5 inches Insulation multiply by 0.81For 6 inches Insulation multiply by 0.79Temperature of Insulated Surface—°F2600240022002000180016001400120010008006004002000Heat Losses from Vertical Insulated Surfaces127 mm (5 in.) Insulation152 mm (6 in.) Insulation102 mm (4 in.) Insulation76 mm (3 in.) Insulation51 mm (2 in.) Insulation25 mm (1 in.) Insulation0 mm (0 in.) Insulation0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8Losses—W/in 21400Heat Losses from Horizontal Metal SurfacesTemperature of Surface—°F1300120011001000900800700600Natural ConvectionCombined Convection and Radiatione=0.20Combined Convection and Radiation e=0.40*Combined Convectionand Radiation e=1.0500Temperature of Surface—°F0210190170150130110901 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20Losses—W/in 2Combined Convection and Radiation—Losses from Water Surfaces60 Percent Humidity40 Percent HumidityResources and InformationReference Data* For losses of molten metal surfaces,use the curve e=0.40.700100 200 300 400 500 600 700 800 900 1000 1100 1200 1300Losses—W/ft 2399