Dryer Airflow Temperature Control for Variable Ambient Conditions
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Solution Overview
Problem
Conventional dryer appliances have a single preset threshold temperature for regulating air temperature, which can lead to inefficient drying times and energy wastage due to ambient temperature variations, causing the heating assembly to be excessively cycled.
Innovation Solution
A method and apparatus for controlling a dryer appliance that measures ambient temperature, compares it to a baseline, sets an airflow temperature threshold, and directs the heater accordingly, allowing for dynamic adjustment of heating operations based on ambient conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single preset threshold temperature is used for regulating air temperature, then the control system is simple, but the drying performance becomes inefficient under varying ambient conditions
Solution Approach 1:
The patent applies dynamics by transitioning from a static preset threshold temperature to a dynamic threshold that adjusts based on ambient temperature conditions. The controller modifies the threshold temperature according to the difference between ambient temperature and a baseline temperature, enabling the system to adapt to varying environmental conditions and maintain optimal drying efficiency without excessive complexity.
2Device complexity
If the heating assembly is excessively cycled to maintain a fixed threshold temperature, then energy consumption increases, but the temperature control remains simple
Solution Approach 1:
The patent applies parameter changes by modifying the threshold temperature parameter based on ambient temperature conditions. When ambient temperature exceeds the baseline temperature, the threshold is increased proportionally, allowing the heating assembly to operate more efficiently without excessive cycling. This dynamic parameter adjustment reduces energy consumption while maintaining simple control logic.
3Device complexity
If the heating assembly is excessively cycled, then drying time increases, but the temperature regulation mechanism remains straightforward
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the threshold temperature based on ambient conditions. This prevents excessive cycling of the heating assembly by aligning the threshold with actual environmental temperatures, thereby reducing unnecessary on/off cycles and minimizing drying time while keeping the regulation mechanism straightforward.
4Ease of operation
If a fixed threshold temperature is used, then the system is easy to operate, but it cannot adapt to different ambient conditions
Solution Approach 1:
The patent applies self-service by enabling the system to automatically adjust its threshold temperature based on ambient temperature measurements. The controller autonomously calculates the temperature difference from baseline and modifies the threshold accordingly, eliminating the need for user intervention while maintaining ease of operation and improving adaptability to different environmental conditions.
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 approach enables time and energy-efficient drying performance across varying conditions by optimizing heating operations, ensuring clothes are dried efficiently while minimizing energy consumption.
Implementation Method 1
a temperature sensor disposed in fluid communication with the air passage to detect temperature therein
Implementation Method 2
a heater attached to the drum in thermal communication with the drying chamber
Data Source
AI summary
A dryer appliance, including methods of operation, is generally provided herein. At least one method may include measuring an ambient temperature of air unheated by the heater; comparing the measured ambient to a baseline ambient temperature; setting an airflow temperature threshold based on the comparison; and directing the heater based on the airflow temperature threshold.