Baking Drawer Ventilation Design to Reduce Preheat Time and Cost
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Solution Overview
Problem
Conventional baking drawers are limited by their small size, relying solely on radiation for heat transfer, leading to long preheat times and increased costs due to the use of two heating elements and multiple materials, which also raises the drawer height.
Innovation Solution
A baking drawer design featuring a ventilated region with strategically placed vents to enhance airflow, using a single material (aluminized steel) and a single heating element, combining convection and radiation for faster heat transfer, and eliminating the need for a second heating element to reduce size, cost, and preheat time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional baking drawers rely on radiation alone for heat transfer, then the drawer height can be kept small, but preheat times become excessively long
Solution Approach 1:
The patent changes the heat transfer parameters by introducing convection airflow through strategically positioned vents (front, rear, and sidewall vents) in addition to radiation from the heating element. This multi-mode heat transfer approach reduces preheat time from 45 minutes to a significantly shorter duration while maintaining a compact drawer height of 4-4.5 inches.
2Productivity
If two heating elements are used to reduce preheat time, then heating efficiency improves, but manufacturing cost and drawer height increase
Solution Approach 1:
The patent uses pneumatic principles by introducing forced convection airflow through vents positioned at the front, rear, and sidewalls of the drawer assembly. This airflow system enhances heat distribution and heating efficiency without requiring a second heating element, thereby maintaining low manufacturing cost and compact drawer height.
3Productivity
If two different materials (steel and aluminized steel) are used to improve heating performance, then heat distribution improves, but manufacturing cost increases
Solution Approach 1:
The patent changes the approach to heat distribution by using convection airflow through strategically positioned vents instead of relying on multiple materials. The drawer assembly is constructed from a single material (steel or aluminized steel), and the enhanced heat distribution is achieved through the convective airflow pattern created by the vent system, reducing manufacturing complexity and cost.
4Length of stationary object
If drawer height is reduced to save space, then space efficiency improves, but heat transfer effectiveness decreases
Solution Approach 1:
The patent successfully maintains a compact drawer height of 4-4.5 inches while achieving effective heat transfer through the implementation of a convection airflow system. Vents positioned at the front, rear, and sidewalls create airflow patterns that enhance heat distribution throughout the compact space, proving that space efficiency and heat transfer effectiveness can be simultaneously achieved.
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
The design significantly reduces preheat times and manufacturing costs while allowing for a more compact form factor by utilizing improved airflow and a single heating element, enhancing the efficiency of heat transfer through both convection and radiation.
Implementation Method 1
conventional baking drawers rely on radiation alone for heat transfer
Implementation Method 2
combining convection and radiation for faster heat transfer
Implementation Method 3
The vent is configured to direct air entering the ventilated region toward a center of the drawer assembly
Data Source
AI summary
A baking drawer includes an oven cavity and a drawer assembly movable relative to the oven cavity between an extended position, where the drawer assembly is accessible by a user, and a retracted position, where the drawer assembly is located within the oven cavity. The drawer assembly has a bottom wall, two opposing sidewalls and a rear wall. A first vent is formed in the bottom wall, and a second vent is formed in the rear wall. The vents allow air to flow into and out of a ventilated region delineated by the bottom wall, the two sidewalls and the rear wall.