Dishwasher Drying Control Using Humidity Feedback
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Solution Overview
Problem
Existing dishwasher drying systems do not account for the type and quantity of objects being washed, leading to inefficient and potentially incomplete drying processes, resulting in unnecessary thermal energy waste.
Innovation Solution
A system that uses a humidity sensor to monitor and regulate the drying process by heating the air in the dishwasher with heat-generating means, ensuring optimal drying time and energy usage based on the humidity levels detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a fixed drying process is used without considering object type and quantity, then the drying system is simple to operate, but the drying process lasts longer than necessary causing unnecessary thermal energy waste
Solution Approach 1:
The patent implements a feedback mechanism where a humidity sensor continuously monitors the humidity level in the drying chamber and sends signals to the control unit. The control unit adjusts the heating element and circulation fan based on this feedback, dynamically regulating the drying process to match actual moisture conditions rather than following a fixed timeline.
Solution Approach 2:
The drying system automatically determines when the drying process is complete by monitoring humidity levels itself, without requiring user intervention or estimation. The control unit autonomously adjusts drying parameters and terminates the process when the predetermined humidity threshold is reached, making the system self-regulating.
2Reliability
If a fixed drying process is used without considering object type and quantity, then the drying system is simple to control, but the drying process may be too short causing objects to remain incompletely dried
Solution Approach 1:
The humidity sensor provides continuous feedback on the moisture content in the drying chamber, allowing the control unit to reliably determine when drying is complete. This feedback loop ensures that the drying process continues until the predetermined humidity threshold is reached, guaranteeing complete drying regardless of object type or quantity.
Solution Approach 2:
The patent replaces mechanical timing mechanisms with an electronic humidity sensing and control system. Instead of relying on fixed time intervals, the system uses electronic sensors and control circuits to monitor and regulate the drying process, achieving more reliable results through electronic measurement and control.
3Productivity
If the clear rinsing liquid is heated to high temperature for own-heat drying, then water adhering to objects is evaporated effectively, but excessive thermal energy is consumed
Solution Approach 1:
The drying system dynamically adjusts the heating element power and circulation fan speed based on real-time humidity sensor readings. Rather than maintaining constant high temperature, the system modulates heating intensity to match the actual drying needs, increasing heat input when humidity is high and reducing it as drying progresses, thereby improving efficiency while reducing energy consumption.
Solution Approach 2:
The system changes the temperature parameter dynamically during the drying process based on humidity levels. The control unit adjusts the heating element to maintain optimal temperature conditions for evaporation while preventing excessive energy consumption. This parameter adjustment allows the system to achieve effective drying with reduced thermal energy input compared to fixed high-temperature processes.
4Quantity of substance
If a separate heat source is used to heat moist air mixture during drying, then air can absorb larger quantity of water, but unnecessary thermal energy is wasted when objects are already sufficiently dried
Solution Approach 1:
The humidity sensor provides feedback on the moisture content of air and objects during drying. The control unit uses this information to regulate the separate heat source, activating it when humidity levels indicate continued drying is needed and deactivating it when the predetermined threshold is reached, thereby preventing unnecessary thermal energy waste while maintaining adequate water absorption capacity.
Solution Approach 2:
The heating element operates in periodic cycles rather than continuously, being activated when humidity sensor readings indicate the need for additional heating and deactivated when drying objectives are approached. This periodic operation allows the system to maintain effective drying capability while minimizing unnecessary thermal 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
This approach allows for individually adjusted and regulated drying times, reducing energy consumption and minimizing stress on washed items, while ensuring complete drying of objects.
Implementation Method 1
a humidity sensor detects the humidity of at least part of the air present in the dishwasher
Implementation Method 2
heat generating means for heating at least part of the air present in the dishwasher
Implementation Method 3
water adhering to the objects to be washed is evaporated by heat stored in the objects to be washed
Data Source
AI summary
A dishwasher is provided having a washing container for retaining therein objects to be washed by the dishwasher and a system for drying objects to be washed. The system for drying objects to be washed includes a heat generator for heating at least part of the air present in the dishwasher and a humidity sensor that detects the humidity of at least part of the air present in the dishwasher, such that only the amount of energy that is actually required for optimal drying is supplied in the form of heat energy for drying.