Method for operating a laundry dryer
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Solution Overview
Problem
Existing tumble dryer control methods fail to effectively adapt to the main fiber content of laundry, leading to potential damage from inappropriate temperature profiles and drying conditions, especially for sensitive fibers like synthetic and wool.
Innovation Solution
A method that measures humidity and temperature over time during the initial phase of the drying process, compares the recorded data with stored profiles for cotton, wool, and synthetic fibers, and adjusts the tumble dryer's operation to protect sensitive fibers by optimizing temperature, drum movement, and duration based on the identified fiber type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed temperature profile is used for drying all laundry, then the drying process is simple to control, but sensitive fibers (synthetic and wool) may be damaged due to inappropriate high temperatures
Solution Approach 1:
The temperature profile is changed from a fixed static value to a dynamic adaptive profile. The control unit adjusts the maximum temperature and heating rate based on real-time humidity measurement data, allowing the drying process to adapt to different fiber types automatically. This resolves the contradiction by making the system both simple to operate (automatic adaptation) and protective of sensitive fibers.
Solution Approach 2:
The system uses its own humidity measurement capabilities to automatically determine the appropriate temperature profile without external intervention. By analyzing the humidity reduction rate during the drying process, the system self-identifies the fiber type and self-adjusts the temperature parameters, eliminating the need for manual input while protecting sensitive materials.
2Productivity
If the main fiber content is not detected, then the drying process can proceed without complex analysis, but the temperature and duration cannot be optimized for different fiber types
Solution Approach 1:
The system implements a feedback mechanism where humidity measurements taken during the drying process are continuously monitored and fed back to the control unit. The control unit analyzes the humidity reduction rate and uses this feedback to identify the fiber type and adjust the drying parameters accordingly. This approach enables optimization without requiring complex pre-detection systems.
Solution Approach 2:
The patent replaces complex mechanical or manual fiber detection methods with a sensor-based measurement system. By using humidity sensors to indirectly detect fiber type through the drying kinetics, the system achieves accurate fiber identification without direct mechanical analysis of the laundry composition.
3Reliability
If the drying process is extended to ensure complete drying of all fibers, then drying completeness is improved, but energy consumption increases and sensitive fibers may be exposed to damaging conditions longer
Solution Approach 1:
The drying duration and temperature profile are dynamically adjusted based on the identified fiber type. For sensitive fibers like synthetic and wool, the system uses lower temperatures with extended duration optimized for these materials, while for robust fibers like cotton, higher temperatures with shorter duration are applied. This ensures complete drying for each fiber type without unnecessary energy consumption.
Solution Approach 2:
The system changes the drying parameters (temperature, duration, heating rate) based on the detected fiber type. By matching the drying parameters to the specific thermal properties of each fiber type, the system achieves complete drying at minimum energy consumption, avoiding both under-drying and excessive energy use.
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 early and accurate identification of the main fiber content, enabling adaptive control to prevent fiber damage while optimizing drying efficiency and energy usage.
Implementation Method 1
the humidity of the air in the tumble dryer or its progression over time is recorded or measured. In this case, the absolute humidity or air humidity can be measured, for which purpose a correspondingly suitable humidity sensor can be used
Implementation Method 2
The temperature of the air in the tumble dryer can then advantageously also be recorded over time
Implementation Method 3
the central idea of the invention is that an additive, in particular moisture, is added to a treatment room for the laundry
Implementation Method 4
The temperature of the air in the tumble dryer can then advantageously also be recorded over time, in order in turn to be able to draw conclusions about the values for the required humidity
Data Source
Figure 1~2
AI summary
In a method for operating a tumble dryer (11) for drying damp laundry, the course of the humidity of the air in the tumble dryer (11), advantageously the absolute humidity, is measured during an initial phase of the drying process. Then their course is compared with stored courses for the humidity or a slope of their course is compared with stored slope limit values (SGO, SGU) for slope values of the humidity. Courses and/or slope limit values (SGO, SGU) are stored for fibers from the following group: cotton, wool, synthetic fibers, as well as an upper slope limit value (SGO) and a lower slope limit value (SGU). If the upper slope limit (SGO) is exceeded, a main proportion of synthetic fibers is detected for the laundry, if the lower slope limit (SGU) is not reached, a main proportion of wool is detected, and in between a main proportion of cotton.