Zero-Clearance Combination Oven Using Internal Air Plenum Cooling
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Solution Overview
Problem
Commercial ovens face challenges in maintaining the temperature of the equipment compartment due to heat transfer from the cooking cavity, requiring external clearance that can be difficult to achieve in space-constrained environments.
Innovation Solution
The implementation of a 'zero clearance' oven design featuring an internal air circulation plenum within the outer wall, utilizing forced airflow to internalize the necessary clearance distance and eliminate the need for passive insulation, allowing the oven to be placed adjacent to other heat-generating equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the equipment compartment is placed adjacent to the cooking cavity to provide mechanical and electrical connections, then the structural complexity is reduced and connections are simplified, but heat transfer from the cooking cavity raises the temperature of the equipment compartment beyond acceptable levels
Solution Approach 1:
The invention divides the equipment compartment into two distinct thermal zones: a hot zone adjacent to the cooking cavity containing heat-generating components, and a cool zone containing temperature-sensitive electronics. This segmentation allows each zone to be optimized for its specific thermal requirements while maintaining physical proximity for simplified connections.
Solution Approach 2:
The patent introduces thermal barriers and insulating structures as intermediary elements between the cooking cavity and the equipment compartment. These intermediaries block heat transfer pathways while allowing mechanical and electrical connections to pass through, thus protecting sensitive components from excessive heat.
2Temperature
If passive thermal insulation is added to the equipment compartment to reduce heat transfer, then the equipment compartment temperature is controlled, but the thickness of the outer wall increases reducing access to the equipment compartment
Solution Approach 1:
The equipment compartment wall is segmented into modular sections with differentiated insulation thicknesses. Areas requiring frequent access have reduced insulation thickness or removable panels, while areas with high heat transfer risk maintain full insulation. This segmented approach balances thermal protection with maintenance accessibility.
Solution Approach 2:
The patent incorporates removable or adjustable insulation panels in the equipment compartment wall. These dynamic insulation elements can be temporarily removed or reconfigured during maintenance activities, then restored to provide thermal protection during normal operation, thus adapting to different operational states.
3Temperature
If minimum clearance distance from other equipment is enforced to prevent radiated or conducted heat, then the equipment compartment temperature remains within expected range, but the ability to place the oven in space-constrained environments is reduced
Solution Approach 1:
The patent changes the thermal parameters of the equipment compartment by introducing active cooling systems and improved insulation materials. This allows the compartment to maintain acceptable temperatures even when placed in close proximity to other heat-generating equipment, thereby eliminating the need for large clearance distances and improving installation flexibility.
Solution Approach 2:
The invention converts the harmful effect of nearby heat sources into a manageable condition by using the same heat-generating environment to pre-heat intake air for the cooling system, or by using reflective barriers that redirect radiant heat away from sensitive components. This approach allows close placement while maintaining 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 design effectively cools the equipment compartment, maintaining optimal temperatures for convection and steam cooking while enabling compact installation and improved access for maintenance, without the need for additional insulation.
Implementation Method 1
A plenum is attached to an inner surface of the outer vertical wall of the equipment compartment to promote a flow of air along the inner surface of the outer vertical wall as part of a path from an intake point outside of the housing to an exit point outside of the housing
Implementation Method 2
The oven may include a fan for drawing air into the housing and through the plenum
Implementation Method 3
promote airflow using natural convection and to take advantage of the typical favorable air temperature differences and flow patterns within a kitchen
Data Source
AI summary
A commercial oven, such as a combination oven providing steam and convection heating, may provide an equipment cabinet holding electronic equipment and having an external wall abutting other heating apparatus. The external wall includes an interior plenum through which air is circulated to provide compact virtual insulation from external heat sources.