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13 14 15 16 17 18 11/22/2021 Heating Methods and Technology Types 1. Conduction by direct contact hot plate or electric blanket 2. Convection using cycles of hot air (cyclic systems) 3. Convection using superheated steam 4. Radio frequency (RF) or dielectric heat What’s needed for Vacuum Drying? • Required a pressure vessel • Limits sizes • Low heat requirements • Vacuum pump • Temperature is control through wood core or condense water Drying is control by assume MC, by implied internal temp and vacuum level Conductive Heating • Heat transfer is by direct contact with a hot surface • Electric blankets • Issues with heating uniformly • Platens filled with hot water • Efficient and uniform heating • Labor intensive Conductive Heating Kiln • Use of robotics to overcome labor and loading https://www.vacutherm.com/home/vacupress-drying-centers/ 3PDF Image | Understanding Vacuum Drying Technologies
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