Dryer Appliance Temperature-Based Control for Moisture-Adaptive Drying
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Solution Overview
Problem
Conventional dryer appliances often inaccurately predict drying completion due to sensitive moisture sensors, leading to under-drying or over-drying of clothes, and rely on load size algorithms that are not effective until cycle completion, resulting in inefficient drying times.
Innovation Solution
A dryer appliance equipped with a temperature sensor and controller that measures air temperature, determines vent restriction levels, and adjusts operating parameters based on remaining moisture content and vent restriction to optimize drying performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If moisture sensors are used to detect moisture content, then drying completion can be predicted, but the sensors produce inaccurate readings and are extremely sensitive to initial moisture content
Solution Approach 1:
The patent introduces temperature as an intermediary parameter to indirectly assess drying progress. Instead of relying directly on moisture sensors that are sensitive to initial conditions, the system measures air temperature changes in the dryer chamber, which serve as a more stable mediator to infer moisture removal progress and predict drying completion.
Solution Approach 2:
The patent replaces the mechanical/electrical moisture sensing system with a thermal measurement system. By substituting moisture content detection with temperature measurement, the system avoids the sensitivity issues of moisture sensors while maintaining the ability to track drying progress through thermal field changes.
2Ease of operation
If conventional moisture sensors are used, then drying completion can be detected, but loads with high initial moisture content are under-dried and loads with low initial moisture content are over-dried
Solution Approach 1:
The patent changes the measurement parameter from moisture content to temperature. By monitoring temperature changes in the dryer chamber air, the system can adaptively determine drying completion for different load types and initial moisture contents, achieving more uniform drying results across varied conditions while maintaining automatic control.
3Loss of information
If load size algorithms are implemented, then load characteristics can be determined, but the algorithm is not effective until cycle completion
Solution Approach 1:
The patent performs preliminary temperature measurements and establishes baseline temperature profiles at the start of the drying cycle. By pre-characterizing the thermal behavior of different load types through temperature monitoring, the system can optimize drying parameters in real-time without waiting for cycle completion, thereby reducing overall drying time.
4Productivity
If dryer operates with fixed parameters, then operation is simple, but drying efficiency cannot be optimized for different conditions
Solution Approach 1:
The patent implements dynamic parameter adjustment based on real-time temperature measurements. The drying parameters such as heating power and cycle duration are continuously adapted according to the observed temperature profile, which reflects the actual moisture removal progress. This dynamic approach optimizes drying efficiency for different load conditions while maintaining relatively simple system architecture.
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 ensures clothes are dry while minimizing cycle time and energy consumption by accurately determining moisture levels and adjusting parameters for improved drying efficiency.
Implementation Method 1
a temperature sensor for measuring a temperature of air circulated through the drum
Implementation Method 2
a heater assembly that passes heated air through the chamber in order to dry moisture-laden articles positioned therein
Implementation Method 3
an air handler or blower is used to urge the flow of heated air from chamber, through a trap duct, and to the exhaust duct
Data Source
AI summary
A dryer appliance includes a drum rotatably mounted within a cabinet for receiving a load of clothes during a drying cycle. A temperature sensor measures a temperature of air circulated through the drum and a controller obtains a remaining moisture content of the load of clothes from a washing machine appliance, obtains a measured air temperature using the temperature sensor, determines a restriction level of a vent based at least in part on the measured air temperature, and adjusts at least one operating parameter of the dryer appliance based at least in part on the remaining moisture content and the restriction level.