Dishwasher comprising a sorption drying device
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Solution Overview
Problem
Dishwashers with sorption drying systems face challenges in consistently and thoroughly drying reversibly dehydratable sorption materials during the desorption process, leading to potential overheating and inefficiencies.
Innovation Solution
The sorption material is formulated as a granular solid with an average fill density of at least 500 kg/m3, specifically between 600 and 700 kg/m3, to enhance drying efficiency and compactness, allowing for thorough and energy-efficient drying and regeneration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the sorption material is heated to very high temperatures for desorption, then water is released from the sorption material, but local overheating occurs during the desorption process
Solution Approach 1:
The patent applies parameter changes by specifying an optimal temperature range for desorption (80°C to 450°C, preferably 220°C to 250°C) and controlling the heating process to achieve thorough drying without excessive overheating. This resolves the contradiction by finding the optimal temperature parameter that balances drying efficiency with prevention of harmful overheating.
Solution Approach 2:
The patent implements periodic action through alternating sorption and desorption cycles. During desorption, the sorption material is heated to release stored water, then during sorption, it cools and absorbs moisture again. This periodic cycling prevents continuous overheating while maintaining drying efficiency.
2Quantity of substance
If the sorption material is heated to very high temperatures for desorption, then water is released from the sorption material, but drying consistency and thoroughness deteriorate
Solution Approach 1:
The patent employs feedback mechanisms through sensors (temperature sensor TSE, humidity sensor TSH) that monitor the desorption process and provide information to the control device (HE). This enables automatic adjustment of heating power and duration to achieve consistent and thorough drying while preventing overheating.
Solution Approach 2:
The patent specifies precise parameter ranges for desorption temperature (80°C to 450°C, preferably 220°C to 250°C) and controls these parameters through the heating device (HZ) and control system to ensure consistent water release and thorough drying across multiple cycles.
3Temperature
If a heater is arranged upstream of the sorption column air inlet, then air heating during desorption occurs, but energy efficiency decreases
Solution Approach 1:
The patent merges the heating function with the desorption process itself. The heater (HZ) positioned in the sorption container directly heats the sorption material for water release, and this heat is then utilized to warm the air during the desorption phase, combining multiple functions into one system to improve energy efficiency.
Solution Approach 2:
The patent converts the heat that would otherwise be wasted during desorption into a beneficial heating source for the air and washing container. The high-temperature desorption process, which could cause overheating, is instead used to efficiently heat the air for drying, turning a potential harmful effect into a useful function.
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 thorough, energy-efficient drying of items in the dishwasher and reliable regeneration of the sorption material, preventing overheating and improving the overall performance of the sorption drying system.
Implementation Method 1
moisture is removed from the air guided therethrough by the reversibly dehydratable drying material of said sorption column through condensation
Implementation Method 2
a sorption container (SB) having a sorption unit (SE) with reversibly dehydratable sorption material (ZEO)
Implementation Method 3
For regeneration, i.e. desorption of the sorption column, the reversibly dehydratable drying material thereof is heated to very high temperatures. Water stored in this material is thereby released as hot water vapor
Implementation Method 4
Water stored in this material is thereby released as hot water vapor
Implementation Method 5
A washing liquor and/or dishes located in the washing container (SPB), as well as the air located in the washing container can be heated by this means
Data Source
AI summary
A dishwasher is provided, which has a washing container; an air-guiding channel to generate an air flow; and a sorption drying system to dry items to be washed, wherein the sorption drying system has a sorption container with reversibly dehydratable sorption material. The sorption container is connected to the washing container by the air-guiding channel and the reversibly dehydratable sorption material is one of a granular solid and a granulate with an average fill density of at least 500 kg/m3.