Oven Plenum Cooling System to Limit Outer Shell Temperature Rise
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Solution Overview
Problem
Conventional ovens and kilns often struggle to maintain heat within the oven while preventing overheating of the outer shell, leading to inefficient heating processes and potential safety issues.
Innovation Solution
The design incorporates an outer housing with an oven core, insulation, and a blower system that directs cooling fluid through a plenum to manage heat and airflow, using a cam-style latching mechanism and ceramic insulation to maintain temperature control and minimize external heat rise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional ovens and kilns are used to maintain heat within the oven, then the heating process is effective, but the outer shell overheats causing safety issues and energy loss
Solution Approach 1:
The oven is segmented into distinct thermal zones: an inner cooking chamber that retains high heat for effective heating, and an outer shell with active cooling that maintains safe temperatures. The cooling system divides the outer shell into regions with different cooling requirements, with cooling channels positioned to address hot spots specifically.
Solution Approach 2:
A cooling fluid (air or liquid) acts as an intermediary between the hot inner chamber and the outer shell. The cooling fluid absorbs excess heat from the inner chamber through conduction and convection, then transports it to cooling channels or exhaust openings, preventing the outer shell from overheating while maintaining efficient heat transfer for cooking.
2Loss of energy
If the outer shell is insulated to prevent heat loss, then energy efficiency improves, but the outer shell temperature rises creating safety hazards
Solution Approach 1:
The harmful heat that would otherwise accumulate in the outer shell is extracted through dedicated cooling channels and exhaust openings. The cooling system actively removes heat from the outer shell regions that would otherwise overheat, allowing the oven to maintain energy efficiency while preventing safety hazards.
Solution Approach 2:
The outer shell is designed with non-uniform thermal properties - heavily insulated in regions where heat retention is beneficial for energy efficiency, and equipped with active cooling channels or exhaust openings in regions prone to overheating. This local differentiation allows simultaneous optimization of energy efficiency and safety.
3Temperature
If cooling channels are added to the outer shell, then outer shell temperature is controlled, but device complexity increases
Solution Approach 1:
The cooling function is merged with the existing outer shell structure rather than being added as a separate complex system. Cooling channels are integrated into the shell's walls, and exhaust openings are incorporated into the shell's existing geometry, allowing temperature control without proportionally increasing device complexity.
Solution Approach 2:
The cooling system utilizes natural convection and conduction processes to move heat from the inner chamber through the shell walls and into the cooling channels, where it is passively exhausted to the environment. This self-service approach minimizes the need for active cooling components like refrigeration systems, reducing overall complexity while maintaining effective temperature control.
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
This solution effectively maintains the inner temperature while limiting the outer shell's temperature rise to approximately 20 degrees Celsius, ensuring efficient heating processes and safety by actively managing heat and airflow.
Implementation Method 1
a blower directing a cooling fluid flow into the plenum; wherein fluid flow from the blower is directed through the plenum
Implementation Method 2
an oven core comprising an oven core housing, an interior insulation layer and a heating coil; The insulator can be a ceramic insulator
Implementation Method 3
an oven core comprising an oven core housing, an interior insulation layer and a heating coil
Data Source
AI summary
An oven or kiln includes a fan or blower system that provides air to a plenum between the oven core and an outer housing. Vents in the housing aid in directing airflow around the plenum to maintain an outer surface of the oven close to ambient temperature.