Household dishwasher having a sorption drying device and associated method
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Solution Overview
Problem
Household dishwashers with sorption drying systems face challenges in ensuring functional reliability during sorption and desorption processes, particularly due to the risk of overheating and thermal stress on sorption drying materials, which can lead to material damage and inefficient energy use.
Innovation Solution
A monitoring/control device derives control signals from the volume flow caused by the washing liquid pump to adjust the electrical components of the sorption drying device, including a fan unit and heating device, ensuring safe operation within permissible ranges and preventing overheating by monitoring the electrical current drawn by the pump, which correlates with the liquid volume flow, thus avoiding unnecessary heating and thermal stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the heating device operates at high temperature during desorption process, then the sorption drying material is effectively regenerated, but the risk of overheating and thermal damage to the material increases
Solution Approach 1:
The control device continuously monitors the volume flow of washing liquid through the pump and uses this feedback to dynamically adjust the operation of the heating device and fan unit. When volume flow falls below a threshold indicating insufficient cooling capacity, the control device automatically reduces or stops heating operation, preventing thermal damage while allowing high-temperature operation when conditions are safe.
Solution Approach 2:
The system performs a preliminary check of the volume flow condition before initiating or continuing high-temperature desorption heating. By monitoring pump operation and liquid flow in advance, the system ensures that sufficient cooling liquid is available before subjecting the sorption material to high temperatures, thereby preventing thermal stress damage.
2Productivity
If the heating device is operated continuously during desorption, then the regeneration process is completed efficiently, but energy is wasted when insufficient liquid is available for cooling
Solution Approach 1:
The control device uses real-time feedback from volume flow monitoring to determine when heating should be applied. Heating is activated only when the pump is delivering sufficient washing liquid flow to provide adequate cooling during desorption. When flow is insufficient, heating is automatically reduced or stopped, eliminating energy waste while maintaining productivity when conditions permit.
Solution Approach 2:
The heating operation is made dynamic rather than static - the heating device operates at variable power levels or is intermittently activated based on real-time monitoring of liquid flow conditions. This dynamic adjustment optimizes the balance between completing the desorption process efficiently and avoiding energy waste when cooling capacity is insufficient.
3Object-affected harmful factors
If the volume flow monitoring is implemented to prevent overheating, then the safety of the sorption material is improved, but the device complexity increases due to additional monitoring requirements
Solution Approach 1:
The existing washing liquid circulation system's pump serves a dual function: it not only circulates washing liquid for the washing process but also provides the cooling flow necessary for safe desorption heating. The control device leverages the pump's existing operational parameters (volume flow, motor current) to self-monitor cooling capacity without requiring separate dedicated sensors, thereby reducing the complexity increase that would otherwise result from additional monitoring equipment.
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 the sorption drying device operates reliably, preventing material damage and overheating, while optimizing energy use by ensuring sufficient liquid volume for cooling during desorption processes, thus maintaining the functional integrity and efficiency of the dishwasher.
Implementation Method 1
hot, humid air from the washing compartment of the dishwasher is continuously guided by a blower through the sorption column of the sorption drying device. In the process, their reversibly dehydratable sorption drying material is deprived of moisture from the air that is passed through due to condensation.
Implementation Method 2
it is dried in that liquid stored during a desorption process, in particular water, is removed by desorption. For this purpose, air flowing through the sorption drying material is heated to such high temperatures with the aid of at least one heating device that liquid stored in the sorption drying material, in particular water, escapes as hot vapor as possible completely.
Implementation Method 3
The water vapor that is expelled is carried along by the air flow generated by the blower into the washing compartment.
Data Source
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AI summary
The invention relates to a household dishwasher (GS) comprising at least one washing liquor pump (UP) and at least one sorption drying device (STE), the one or more electrical components (HZ1, LT) of which can be controlled with at least one monitoring/control device (HE), wherein the monitoring/control device (HE) derives at least one control signal (SS1) from the respective volumetric flow rate (Q) effected by the washing liquor pump (UP) to adjust the one or more electrical components (HZ1, LT) of the sorption drying device (STE).