Dual-Zone Infrared Heating Element for Wavelength-Controlled Cooking
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Solution Overview
Problem
Existing heating elements for cooking appliances cannot control the distribution or wavelength of infrared radiation, limiting precise control over cooking and browning processes.
Innovation Solution
A heating element arrangement with two distinct zones, one emitting IR radiation in a first wavelength range (3700-2850 cm−1) for O—H bindings and another in a second range (1165-650 cm−1) for C—H bindings, allowing separate control of heating and browning processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single heating element is used to provide IR radiation for cooking, then the total radiation output can be controlled, but the distribution and wavelength of the radiation cannot be precisely controlled
Solution Approach 1:
The heating element is divided into multiple independent heating zones, each equipped with its own IR converter layer having different wavelength characteristics. This segmentation allows independent control of radiation wavelength and distribution in different zones, achieving precise spectral control without requiring a completely different heating system.
Solution Approach 2:
Different regions of the heating element are assigned different IR converter materials with specific wavelength ranges optimized for different cooking functions. For example, certain zones use materials emitting at wavelengths optimal for browning (affecting C-H bonds), while other zones use materials for heating (affecting O-H bonds). This local differentiation enables precise control of radiation properties at specific locations.
2Use of energy by moving object
If timing devices are used to control heating element operation, then total energy output can be regulated, but the distribution of radiation across different wavelengths remains uncontrolled
Solution Approach 1:
The invention changes the physical parameter of the IR radiation by using different converter materials with distinct wavelength emission characteristics. Instead of merely controlling the timing and total energy output, the system fundamentally alters the radiation spectrum by selecting appropriate IR converter materials for different heating zones, enabling targeted energy delivery for specific cooking objectives.
3Adaptability or versatility
If broad spectrum IR radiation is emitted for general cooking, then all types of food can be heated, but precise control over browning and heating processes is lost
Solution Approach 1:
The heating element is divided into multiple independent heating zones, each equipped with its own IR converter layer having different wavelength characteristics. This segmentation allows independent control of radiation wavelength and distribution in different zones, achieving precise spectral control without requiring a completely different heating system.
Solution Approach 2:
Different regions of the heating element are assigned different IR converter materials with specific wavelength emission ranges optimized for different cooking functions. For example, certain zones use materials emitting at wavelengths optimal for browning (affecting C-H bonds), while other zones use materials for heating (affecting O-H bonds). This local differentiation enables precise control of radiation properties at specific locations.
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
Enables precise control over cooking and browning processes, increasing efficiency and reducing time and energy consumption by optimizing grill programs for different foods.
Implementation Method 1
a first heating zone (12) designed to emit IR radiation in a first wavelength range (L1)
Implementation Method 2
For the browning of the food, the C—H bindings in the food are decisive. Their main absorption is in the range 1165 cm−1, 1078 cm−1, 926 cm-1, 772 cm−1 and 740-650 cm−1 (vibrations in carbohydrates and nucleic acids). For heating the food, the O—H bindings are conversely decisive. Their main absorption is in the range 3700-2850 cm−1.
Implementation Method 3
a second heating zone (14) designed to emit IR radiation in a second wavelength range (L2)
Implementation Method 4
For the browning of the food, the C—H bindings in the food are decisive. Their main absorption is in the range 1165 cm−1, 1078 cm−1, 926 cm-1, 772 cm−1 and 740-650 cm−1 (vibrations in carbohydrates and nucleic acids).
Data Source
AI summary
A heating element arrangement for a cooking appliance includes a first heating zone which is constructed to emit IR radiation in a first wavelength range, and a second heating zone which is constructed to emit IR radiation in a second wavelength range. The first wavelength range and the second wavelength range differ hereby from one another.