초록 ▼

Heating device having a substantially flat heating element with specifically selected physical parameters is provided for heating an object to a required temperature. The physical parameters are selected such as to, at a given power and at a selected voltage supply to the heating element, provide as

Heating device having a substantially flat heating element with specifically selected physical parameters is provided for heating an object to a required temperature. The physical parameters are selected such as to, at a given power and at a selected voltage supply to the heating element, provide as low as desired temperature gradient between the temperature of the outer surface of the heating element through which heat is dissipated and the required temperature of the object. Heating devices of the invention may be implemented in domestic heaters, in food cooking devices, in medical devices, etc. Also provided is a method for designing heating elements for use in such devices.

대표청구항 ▼

1. A heating device for heating an object to a required temperature, the heating device comprising a heating element and a power source for supplying voltage to the heating element, wherein:the voltage U to be supplied to the heating element is selected in accordance to a predetermined application o

1. A heating device for heating an object to a required temperature, the heating device comprising a heating element and a power source for supplying voltage to the heating element, wherein:the voltage U to be supplied to the heating element is selected in accordance to a predetermined application of the heating device; said power source comprises a step-down transformer means, which is composed of an inverter assembly accommodated outside the heating device and connected to a power network, and an output step down transformer mounted inside the heating device and interconnected between said inverter assembly and the heating element; the heating element is made of a selected electrically conductive material of a specific resistivity ", is substantially flat, and has a substantially rectangular cross-section, so as to define at least one major outer surface through which a given heating power required for heating said object is dissipated, wherein a length l, a width b and a thickness .delta. of said heating element satisfy the following relationships: [EQU7] wherein I is a current passing through the heating element; " is the specific resistivity (Ohm?mm2/m); .delta. is the thickness of the heating element in millimeters; k is a correction coefficient providing the units of length and width in meters and millimeters, respectively, such that for a given ratio "/.delta., an increase in the value of k results in an increase in the surface area of said major surface and a decrease in the surface temperature of the heating element; the heating device thereby providing a desired temperature gradient between said at least one major surface of the heating element and said required temperature.