Steam control system for multizone oven
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Solution Overview
Problem
Multi-zone ovens struggle with humidity migration between compartments, limiting precise control over cooking conditions, especially in professional kitchens where diverse dishes require different temperatures and humidity levels simultaneously.
Innovation Solution
A multi-zone oven design with electronically controlled venting to manage humidity differences between compartments, featuring steam generators, electrically actuatable valves, and a controller to regulate steam distribution and venting, along with a steam trap system to prevent high-temperature steam discharge and a common moisture handling system for efficient water management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If steam is introduced into selective cooking cavities, then humidity control in those cavities is improved, but humidity migration to adjacent cavities occurs
Solution Approach 1:
A vapor barrier is introduced as an intermediary element between adjacent cooking cavities to prevent humidity migration. The vapor barrier acts as a mediator that allows each cavity to maintain its desired humidity level independently while preventing unwanted moisture transfer to neighboring cavities.
Solution Approach 2:
The oven interior is segmented into multiple independently controlled cooking cavities, each with its own steam generator and humidity control system. This segmentation allows precise humidity control in each cavity without affecting adjacent cavities, resolving the humidity migration problem through spatial separation.
2Manufacturing precision
If electronically controlled venting is used to manage humidity differences, then humidity control precision is improved, but device complexity increases
Solution Approach 1:
Humidity sensors continuously monitor moisture levels in each cooking cavity and provide feedback to the controller. The controller automatically adjusts the venting system based on this feedback, maintaining precise humidity control while simplifying operation through automated regulation rather than manual intervention.
Solution Approach 2:
The venting system is designed to automatically respond to humidity differences between cavities without requiring manual control. The electronically actuatable valves self-regulate based on controller signals, reducing the operational complexity for the user while maintaining precision humidity control.
3Reliability
If steam trap system is implemented to prevent high-temperature steam discharge, then safety is improved, but device complexity increases
Solution Approach 1:
A steam trap system with a chilled surface is introduced as an intermediary between the steam generator and the external environment. This trap condenses high-temperature steam before discharge, preventing safety hazards while managing moisture effectively. The steam trap acts as a protective mediator that safeguards against harmful steam release.
4Use of energy by moving object
If common moisture handling system is used, then energy consumption is reduced, but device complexity increases
Solution Approach 1:
Multiple moisture handling functions are merged into a common system that serves all cooking cavities. By combining drainage, condensation collection, and moisture removal into a unified infrastructure, the overall energy consumption is reduced compared to having separate systems for each cavity, while the shared architecture actually simplifies the total device complexity.
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 allows for independent temperature and humidity control in each compartment, reducing energy consumption, preventing humidity exchange, and enhancing cooking precision by managing humidity effectively, ensuring that different cooking conditions can be maintained in adjacent compartments.
Implementation Method 1
A steam generator system is configured to introduce steam into selective cooking cavities
Implementation Method 2
A set of electrically actuatable valves communicate between respective outlets in respective cooking cavities and outside air
Implementation Method 3
The controller is configured to operate the electrically actuatable valves to vent cooking cavities that do not receive steam from the steam generator system when those cooking cavities are adjacent to cooking cavities receiving steam
Implementation Method 4
The common discharge outlet may join with a steam trap providing a chilled surface for condensing steam prior to exhaust of that steam into the air
Implementation Method 5
the cooking volume surrounded by insulated outer walls
Implementation Method 6
In convection cooking, heated air is circulated rapidly through the cooking compartment to break up insulating, stagnant layers of air around the food, thereby increasing the rate of heat transfer
Implementation Method 7
Higher velocity air typically increases the rate of heat transfer from the air to the food by further disrupting the insulating, stagnant layers of air around the food
Implementation Method 8
High humidity further enhances the rate of heat transfer to the food as a result of the high specific heat of water compared to dry air
Implementation Method 9
Steam can also reduce water loss from the food
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
A multi-compartment oven providing steam assisted cooking employs active venting to provide improved humidity control and reduced humidity leakage between closely adjacent compartments.