Zero clearance combination oven
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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 that uses forced airflow to internalize the necessary clearance distance, allowing the oven to be placed adjacent to other heat-generating equipment without passive insulation, thereby maintaining the equipment compartment at a suitable temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the oven is placed closely adjacent to other heating devices to save space, then the use of space is improved, but the equipment compartment temperature rises beyond acceptable ranges due to heat transfer
Solution Approach 1:
The patent divides the equipment compartment cooling function into two separate airflow paths: a first airflow path that draws ambient air through insulation to cool the equipment compartment, and a second airflow path that draws ambient air directly to the plenum. This segmentation allows independent control of cooling for different thermal zones, enabling the oven to be placed close to other equipment while maintaining acceptable temperatures in the equipment compartment.
Solution Approach 2:
The patent introduces an intermediary plenum chamber between the cooking cavity and the external environment. This plenum acts as a thermal buffer that receives heated air from the cooking cavity and allows it to cool before being exhausted or redirected, thereby reducing the thermal load on the equipment compartment and enabling closer placement to other heating devices.
2Temperature
If passive thermal insulation is added to reduce heat transfer to the equipment compartment, then the equipment compartment temperature is maintained, but the device complexity and installation difficulty increase
Solution Approach 1:
The patent replaces the traditional mechanical/passive insulation system with an active airflow-based thermal management system. Instead of relying solely on thick insulation layers to block heat transfer, the system uses controlled air circulation through the plenum and equipment compartment to actively remove heat, thereby reducing insulation requirements and simplifying installation.
Solution Approach 2:
The cooling system is designed to draw ambient air automatically through the insulation and through the equipment compartment using fans, creating a self-regulating cooling mechanism. The system serves itself by continuously circulating air to maintain temperature differentials without requiring external intervention or complex control systems.
3Temperature
If thick passive insulation is used to maintain equipment compartment temperature, then temperature control is improved, but access to the equipment compartment for maintenance becomes difficult
Solution Approach 1:
The patent extracts the thermal insulation function from the physical wall structure and relocates it to the airflow path through the plenum. By moving the thermal barrier function to the air stream rather than the solid insulation layer, the physical wall can be made thinner and more accessible, while the thermal protection function is maintained through active air circulation.
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 reduces the need for external clearance, improves access to the equipment compartment for maintenance, and maintains the equipment compartment at a suitable temperature, even when adjacent to other heat sources, without the use of passive 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
This design effectively reduces the need for external clearance, improves access to the equipment compartment for maintenance, and maintains the equipment compartment at a suitable temperature, even when adjacent to other heat sources, without the use of passive insulation
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.