Induction grill
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Solution Overview
Problem
Electric grills based on resistive heating elements lack the ability to cook quickly or at high temperatures due to inefficiencies in heat transfer, primarily relying on radiative heat and lacking convective heat transfer, resulting in sub-par performance.
Innovation Solution
An outdoor cooking grill with induction coils below the cooking surface, a power supply, and a microcontroller for precise control, along with capacitive food sensors and a fan for enhanced heat management, allowing for efficient induction heating and zonal control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If resistive heating elements are used in electric grills, then the grill can be powered by standard electrical outlets, but the cooking speed and maximum temperature are limited due to inefficient heat transfer
Solution Approach 1:
The patent replaces traditional resistive heating elements with induction heating technology. Induction heating uses electromagnetic fields to directly heat the cookware and food, eliminating the inefficient radiative heat transfer from resistive elements. This substitution enables faster heating rates and higher cooking temperatures while maintaining compatibility with standard electrical outlets through efficient electromagnetic energy conversion.
Solution Approach 2:
The patent changes the fundamental heating mechanism from resistive thermal radiation to induction electromagnetic heating. This parameter change in the heating method allows for rapid temperature increases and higher maximum cooking temperatures, directly addressing the limitation of slow cooking speed while improving overall energy transfer efficiency to the food.
2Productivity
If resistive heating elements radiate heat in all directions, then the heating process is simple, but significant heat is lost and cooking efficiency is reduced
Solution Approach 1:
The patent replaces radiative resistive heating with induction heating that uses electromagnetic fields to directly induce currents in the cookware and food. This eliminates the omnidirectional radiation pattern that causes heat loss, concentrating energy transfer where needed and significantly improving cooking efficiency while reducing wasted energy.
Solution Approach 2:
The induction heating system allows the cookware and food themselves to generate heat through induced electromagnetic currents. This self-heating mechanism eliminates the need for external radiative heating elements, reducing heat loss to the surrounding environment and improving overall energy efficiency by directing energy precisely where it is needed.
3Temperature
If limited power from outlets or batteries is used, then the grill can be portable and easy to power, but the maximum cooking temperature and performance are sub-par
Solution Approach 1:
The patent changes the heating mechanism to induction, which has much higher efficiency in converting electrical power to useful heating. This allows the system to achieve high cooking temperatures even with limited power availability from standard outlets or batteries, as the induction process minimizes energy losses and delivers maximum power directly to the cooking load.
Solution Approach 2:
The induction heating system enables rapid phase transitions in food during cooking due to the high power density and efficient energy transfer. Even with limited available electrical power, the induction mechanism can quickly bring food to cooking temperatures and maintain high temperatures, achieving performance comparable to much more powerful traditional heating systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables faster warmup and recovery times, higher cooking temperatures, and more efficient use of electrical power by utilizing induction heating and convection, improving overall cooking performance.
Implementation Method 1
at least one induction coil below the cooking surface... induction coils causing a heating of the ferrous cooking grate
Implementation Method 2
electrically powered induction coil... ferrous material proximate the cooking surface that generates heat in response to induced magnetic fields from the induction coil
Implementation Method 3
a fan delivering air from at least one of the cooking surface, the at least one induction coil, and the shielding layer to an interior of a cooking chamber
Implementation Method 4
A fan may deliver air from at least one of the cooking surface, the at least one induction coil, and the shielding layer to an interior of a cooking chamber
Implementation Method 5
capacitive sensor detecting a location of food on the cooking grate
Data Source
AI summary
An outdoor cooking grill has a cooking surface and at least one induction coil below the cooking surface. A power supply provides current to the at least one induction coil heating the cooking surface.