Dishwasher Sorption Dryer Airflow Conditioning for Uniform Desorption
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Solution Overview
Problem
Existing sorption drying devices in dishwashers face challenges in achieving uniform and efficient sorption and desorption of reversibly dehydratable materials, leading to incomplete drying and energy inefficiency, with issues of local overheating and uneven flow profiles.
Innovation Solution
The integration of a fan upstream of the sorption unit and a heating element between the fan and the sorption unit, combined with flow conditioning means to equalize the air flow cross-sectional profile, ensures a balanced and evenly distributed air flow, enhancing sorption and desorption performance while preventing local overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If a heater is arranged in front of the sorption column to heat air during desorption, then the washing compartment and dishes can be heated, but local overheating of the dry material occurs and uniform drying is difficult to achieve
Solution Approach 1:
The heating process is segmented into two distinct stages: first, the heater heats the air stream before it enters the sorption column; second, the heated air flows through the sorption material to desorb moisture. This segmentation prevents direct contact between the heater and sorption material, eliminating local overheating while maintaining energy efficiency.
Solution Approach 2:
The air stream acts as an intermediary medium that transfers thermal energy from the heater to the sorption material indirectly. The heater heats the air, which then serves as the heating agent for the sorption material during desorption, preventing direct thermal contact and localized overheating.
2Reliability
If air flow is used to pass through the sorption column during drying, then moisture is removed from the air, but the flow cross-sectional profile is uneven leading to incomplete drying
Solution Approach 1:
The air flow is pre-conditioned before entering the sorption column by ensuring uniform distribution across the inlet cross-section. This preliminary action of equalizing the flow profile ensures that all regions of the sorption material receive adequate air flow, preventing incomplete drying in any local area.
3Quantity of substance
If high temperature heating is applied to the sorption column for regeneration, then desorption of moisture is achieved, but energy efficiency is reduced and local overheating occurs
Solution Approach 1:
The heating parameters are optimized by using moderate temperature heating of the air stream rather than direct high-temperature application to the sorption material. This parameter change achieves effective desorption while reducing energy consumption and preventing thermal damage to the material.
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 configuration results in improved energy efficiency, complete drying of the sorption material, and increased sorption performance, ensuring consistent desorption capacity and adsorption capacity across the sorption unit, reducing energy wastage and maintaining material effectiveness.
Implementation Method 1
at least one associated heating element for desorption is provided between the fan and the sorption unit
Implementation Method 2
moisture is removed from the air passed through its reversibly dehydratable dry material by condensation
Implementation Method 3
at least one fan for generating an air flow is provided upstream of the sorption unit
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The washing container (101) of a dishwasher is connected in an air-conducting fashion to a sorption dryer device (105). One or more flow-conditioning means (6) are provided for homogenizing the flow cross-section profile of the airflow (14) as it flows through the sorption dryer device (105).