Temperature Distribution of Frying Pan Heated with a Magnetic Induction Heating Cooker and Its Thermal Efficiency

Abstract

The measurement of coloration of pancakes baked on a magnetic induction heating cooker (M.I.C.) was used for the study of temperature distribution (T.D.) : the pancake showed a circular brown band corresponding to the position of the magnetic induction system housed in the cooker. Pancakes were baked on stainless steel (18-8) frying pans, of 1.3 mm and of 3.4 mm in thickness and varying from high to low heating, the colors of three sections obtained from the center, middle and exterior were measured. Somewhat even colored pancakes were obtained by using the heavier frying pan and by heating at low.
Since JIS (Japan Industrial Standard) has given no specifications for the procedures to be used for the measurement of thermal efficiency (T.E.) of this heating cooker, the following method was used in this study : 1.5 l of water in a stainless steel (18-8) utensil was heated by both 1, 200 W type M.I.C. and also by an electric heater with 120 W·hr and rates of temperature elevation were measured. T.E. for the former was 82% and that for the latter 52%.
Further studies are of course required for developing better methods for the measurement of T.D. and T.E.