Method for drying articles
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Solution Overview
Problem
Conventional microwave drying technologies for laundry can cause runaway thermal effects and arcing due to random energy distribution, making them unsuitable for drying textile materials, whereas radio frequency (RF) drying is more controlled but requires innovative designs to efficiently dry articles.
Innovation Solution
A laundry drying system utilizing a radio frequency (RF) applicator with strategically positioned anode and cathode elements, capacitively coupled to generate a controlled electromagnetic field within a drum, dielectrically heating liquid in the laundry to facilitate efficient drying, avoiding the limitations of microwave technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If microwave frequencies are applied for drying laundry articles, then rapid heating can be achieved, but runaway thermal effects and arcing occur due to random energy distribution
Solution Approach 1:
The patent changes the electromagnetic frequency parameter from microwave to radio frequency range, and controls the electric field parameters (voltage, frequency, distribution) to achieve deterministic heating without thermal runaway. The RF field parameters are optimized to provide controlled energy transfer to water molecules without causing arcing or hot spots.
Solution Approach 2:
The control system monitors the state of the laundry articles and adjusts the RF field parameters in real-time to maintain optimal drying conditions. This feedback mechanism prevents thermal runaway by detecting and correcting deviations from safe operating parameters, ensuring reliable and controlled drying.
2Use of energy by moving object
If conventional microwave drying is used, then heating efficiency can be high, but the random application of waves causes arcing and thermal runaway
Solution Approach 1:
The patent introduces radio frequency electromagnetic fields as an intermediary mechanism between the power source and the water molecules in laundry. This RF intermediary provides deterministic and controlled energy transfer, replacing the random microwave application that causes arcing and thermal runaway, while maintaining high heating efficiency.
Solution Approach 2:
By changing the electromagnetic field parameters from microwave to radio frequency range, and optimizing voltage, frequency, and field distribution, the patent achieves efficient energy transfer to water molecules without the harmful effects of arcing and thermal runaway associated with conventional microwave drying.
3Reliability
If radio frequency fields are used for drying textile material, then controlled and contained e-field can be achieved, but the system complexity increases
Solution Approach 1:
The RF applicator is segmented into multiple electrode elements arranged in specific patterns within the dryer drum. This segmentation allows independent control of different field zones, enabling precise control of the electromagnetic field distribution while maintaining a manageable system structure through modular electrode design.
Solution Approach 2:
The patent transitions from traditional point-source or linear heating elements to a three-dimensional distributed electrode system within the drum. This spatial dimensionality change enables controlled and contained electric fields throughout the drying chamber, improving field control while the modular electrode arrangement keeps the overall system complexity manageable.
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 RF drying system effectively and safely dries laundry by dielectrically heating water within the laundry, reducing the risk of thermal runaway and arcing, while providing deterministic power application and efficient energy use.
Implementation Method 1
When applying an RF electronic field (e-field) to a wet article, such as a clothing material, the e-field may cause the water molecules within the e-field to dielectrically heat, generating thermal energy which effects the rapid drying of the articles.
Implementation Method 2
Dielectric heating is the process in which a high-frequency alternating electric field heats a dielectric material, such as water molecules. At higher frequencies, this heating is caused by molecular dipole rotation within the dielectric material
Data Source
AI summary
A method for drying an article with a radio frequency (RF) applicator having anode elements and cathode elements includes capacitively coupling the anode elements, capacitively coupling the cathode elements, capacitively coupling an anode element to a cathode element, and energizing the RF applicator to generate an RF field between anode and cathode elements wherein liquid residing within the field will be dielectrically heated.