Dishwasher Two-Stage Heating for Lower Thermal Load Drying
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Solution Overview
Problem
Dishwashers expose sensitive items to high thermal loads during heating processes, which can be damaging.
Innovation Solution
A method using an air heater as the first heating means to gently heat liquid, with a water heater as a secondary means for quicker heating, and incorporating a desorption process with reversibly dehydrogenizable drying materials like zeolite to optimize energy efficiency and cleaning performance across multiple program steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a flow-through water heater is used to heat liquid quickly, then heating speed is improved, but thermal load on sensitive items worsens
Solution Approach 1:
The heating process is segmented into two distinct stages: first, gentle heating with an air heater to reduce thermal load on sensitive items, and second, rapid heating with a water heater to achieve the required temperature efficiently. This segmentation allows each heating method to be optimized for its specific function, resolving the contradiction between gentle heating and fast heating.
2Use of energy by moving object
If liquid is heated twice with a flow-through water heater, then heating efficiency is improved, but thermal exposure of items worsens
Solution Approach 1:
The dual heating process is segmented by assigning different heating methods to different stages: the air heater performs the first gentle heating pass to minimize thermal exposure, while the water heater performs the second rapid heating pass to achieve the target temperature efficiently. This segmentation maintains heating efficiency while reducing thermal damage to items.
Solution Approach 2:
The air heater acts as an intermediary heating device between the water supply and the final heating stage. It provides a buffer heating step that prepares the liquid for the subsequent water heater operation, reducing the overall thermal shock to items while maintaining energy efficiency through the two-stage process.
3Duration of action of moving object
If desorption of drying material is completed in one phase, then process time is reduced, but heating temperature must increase, worsening thermal load
Solution Approach 1:
The desorption process is segmented into two phases corresponding to the two heating stages. The air heater performs initial desorption at lower temperatures, and the water heater completes the desorption process at higher temperatures. This segmentation allows complete desorption to be achieved without requiring a single high-temperature phase, thus reducing thermal load on items while ensuring thorough drying material regeneration.
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 reduces thermal loads on items, ensures complete desorption of drying materials, and achieves efficient energy use while providing intensive cleaning and improved drying performance without extending wash program duration.
Implementation Method 1
liquid is heated with a heating means embodied as a flow-through water heater
Implementation Method 2
The heating process with a flow-through water heater provides for a quick heating of the liquid
Implementation Method 3
a water heater to be used as the second heating means. This provides for a further, quicker heating process
Implementation Method 4
a desorption of a reversibly dehydrogenizeable drying material, in particular zeolite, to be effected at least partially during the heating process with the air heater
Data Source
AI summary
A dishwasher and a method for operating a dishwasher, wherein a liquid is heated at least twice with a first heater, and wherein the first heater is an air heater.