Steam injection system and method
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Solution Overview
Problem
Existing vehicle ovens, such as those in aircraft, require long heating times and high external temperatures due to internal heating elements and steam generation, leading to inefficiencies and safety concerns.
Innovation Solution
An oven steam injection system that directly injects externally generated steam into the oven cavity, using a steam generator and injector, and recycles condensed water to reduce heating time and external temperature, eliminating the need for internal heating elements and ventilators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If internal heating elements and steam generation are used in the oven cavity, then steam can be generated for food heating, but heating time increases and external oven temperature becomes excessively high
Solution Approach 1:
The steam generation function is extracted from the oven cavity and relocated to an external steam generator. This removes the heating elements and water reservoir from inside the cavity, eliminating the thermal mass that delays heating while maintaining steam injection capability for efficient food heating.
Solution Approach 2:
The system is divided into separate functional components: an external steam generator handles steam production, while the oven cavity focuses solely on food heating. This segmentation allows independent optimization of each component, enabling rapid cavity heating without the constraint of internal steam generation equipment.
2Adaptability or versatility
If multiple elements (heating element, ventilator, baffle plate) are disposed within the oven cavity to control air flow and generate steam, then steam heating function is achieved, but device complexity increases
Solution Approach 1:
The steam generation components (heating element, water reservoir) and air circulation components (ventilator, baffle plate) are extracted from the oven cavity. Only the essential food heating function remains in the cavity, while steam is injected externally, dramatically simplifying the internal structure.
Solution Approach 2:
The external steam generator serves multiple purposes: it generates steam for food heating and can be used for cavity cleaning by injecting steam and collecting condensate. This multi-functionality reduces the need for separate dedicated components within the cavity.
3Adaptability or versatility
If internal heating elements and steam generation components are installed in the oven cavity, then steam can be produced for heating food, but weight of the oven increases
Solution Approach 1:
All heavy steam generation components (heating element, water reservoir, control mechanisms) are extracted from the oven and placed in an external generator. This leaves the oven cavity as a lightweight structure containing only the necessary food heating components, significantly reducing overall weight.
4Productivity
If high cavity temperature is used to heat food rapidly, then heating speed improves, but external oven temperature becomes excessively high causing safety concerns
Solution Approach 1:
Steam acts as an intermediary heat transfer medium. Instead of directly heating the cavity to high temperatures, steam is injected and condenses on the food surface, transferring latent heat efficiently. This allows rapid food heating while maintaining lower cavity and external oven temperatures, eliminating safety risks.
Solution Approach 2:
The system exploits the phase transition of steam condensing on food surfaces. The latent heat released during condensation provides intense localized heating to the food without requiring the entire cavity to reach high temperatures, enabling fast heating with safe external temperatures.
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 achieves rapid and uniform food heating with reduced oven cavity and external temperatures, improving energy efficiency, safety, and weight savings by eliminating internal heating structures and allowing for water recycling.
Implementation Method 1
directly injects steam into the oven cavity
Implementation Method 2
recycles condensed water
Data Source
Figure 1A
Figure 1B
Figure 2A
AI summary
An oven steam injection system includes an oven having a compartment enclosed on all sides, a door on a front side of the compartment, the door operable to open the compartment, and a steam injector disposed inside the compartment. The oven steam injection system also includes a steam generator having a heater reservoir and a heating element that is operable to heat water within the heater reservoir to generate steam. The steam generator is operable to inject steam into the compartment through the steam injector.