Conveyor Oven Predictive Heating for Temperature Uniformity
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Solution Overview
Problem
Conveyor ovens experience energy wastage and temperature non-uniformity due to heat and noise leakage, and lack efficient control over thermal output to adapt to changing food items passing through the tunnel, leading to extended operation times and suboptimal baking times.
Innovation Solution
A conveyor oven system with a sensor to detect food items and a controller that adjusts the thermal output of the heating element to maintain a set-point temperature, using PID control and anticipatory heating strategies to compensate for temperature drops caused by incoming food items, and energy management modes to reduce energy consumption during idle periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the heating element operates at full thermal output continuously, then the set-point temperature is maintained, but energy consumption increases and energy waste occurs when no food items are present
Solution Approach 1:
The heating element's thermal output is dynamically adjusted based on the presence of food items in the heated tunnel. The controller modifies the heating element's operation from continuous full output to variable output levels, enabling energy savings during idle periods while maintaining temperature stability when needed
Solution Approach 2:
The sensor continuously detects the presence of food items and provides feedback to the controller, which then adjusts the heating element's thermal output accordingly. This closed-loop control system ensures the set-point temperature is maintained only when food items are present, reducing energy consumption during idle periods
2Productivity
If the conveyor oven operates at full capacity continuously, then baking productivity is maintained, but energy waste increases during periods of less than full capacity operation
Solution Approach 1:
The oven system dynamically adapts its thermal output to match the actual baking demand. When food items are detected, the heating element operates at full capacity to maintain productivity; when no food items are present, the thermal output is reduced, eliminating energy waste during idle periods while preserving baking productivity when needed
3Stability of the object's composition
If the internal temperature is maintained uniformly throughout the tunnel, then baking quality improves, but energy consumption increases due to thermal variations caused by food items
Solution Approach 1:
The sensor detects food items before they enter the heated tunnel and triggers the controller to adjust the heating element's thermal output in advance. This preliminary action allows the system to prepare for temperature changes caused by food entry, maintaining heating uniformity and stability without excessive energy consumption
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 system achieves improved temperature uniformity along the oven tunnel, reduces energy wastage, and allows for efficient operation by dynamically adjusting thermal output based on food item presence, thereby optimizing baking times and energy usage.
Implementation Method 1
adjusting the thermal output of the heating element
Implementation Method 2
A conveyor oven system with a sensor and controller that detects food items entering the tunnel
Data Source
AI summary
An oven with a sensor positioned to detect an event that will cause a decrease in the internal temperature of a tunnel. The oven includes a controller configured to increase the thermal output of a heating element in anticipation of the upcoming decrease in the internal temperature. In some embodiments, the oven is a conveyor over and the sensor is positioned to detect a food item approach the tunnel on a conveyor. In some embodiments, the amount of current provided to an electric heating element is increased by increasing the target temperature. In some embodiments, the amount of current provided to the electric heating element is increased by a predetermined offset.