Dishwasher Hot Rinse Control for Faster Wash Liquid Heating
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Solution Overview
Problem
Conventional dishwashers take a long time to heat wash liquid to a preset temperature during a hot rinse cycle due to simultaneous heating and pumping, leading to inefficiency and potential food residue drying on dishes.
Innovation Solution
A dishwasher with a control panel, temperature sensor, and controller that selectively operates the wash pump and heater, activating the pump only after the wash liquid reaches the preset temperature, and periodically operating it to maintain moisture on dishes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the heater and wash pump operate simultaneously during a hot rinse cycle, then the wash liquid can be heated and circulated, but the heating time is extended and energy efficiency deteriorates
Solution Approach 1:
The wash pump is operated before the heater to pre-circulate the wash liquid, ensuring uniform temperature distribution and preventing localized overheating. This preliminary pumping action reduces the overall heating time required to reach the target temperature throughout the entire wash liquid volume.
Solution Approach 2:
The wash pump operates periodically in intervals during the heating process rather than continuously. This periodic operation maintains circulation to distribute heat evenly while allowing the heater to work efficiently during its active periods, thereby reducing total heating time and energy consumption compared to continuous simultaneous operation.
2Object-affected harmful factors
If the wash pump operates continuously during heating, then the wash liquid circulates and prevents food residue drying, but energy consumption increases and heating efficiency decreases
Solution Approach 1:
The wash pump operates periodically rather than continuously, creating intermittent circulation that is sufficient to prevent food residue from drying on dishes. The periodic operation reduces energy consumption significantly while still maintaining adequate moisture on dish surfaces during the heating phase.
Solution Approach 2:
The pump operates for partial durations during the heating cycle rather than the full cycle duration. This partial action provides just enough circulation to prevent harmful drying effects without the excessive energy consumption of continuous operation, achieving the minimum necessary action for the protective 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 approach reduces heating time, conserves energy, and prevents food residue drying by maintaining moisture, thereby enhancing washing effectiveness.
Implementation Method 1
a heater for heating wash liquid
Implementation Method 2
a wash pump assembly attached to a side of the sump for pumping the wash liquid contained in the sump to the discharge members
Data Source
AI summary
A controlling method of a dishwasher is provided. The method includes performing various cycles according to a selected course, beginning a rinse cycle during the execution of the various cycles, controlling the operation of a heater and a wash pump according to whether the rinse cycle was specified as a hot rinse cycle, ending the operation of the wash pump upon completion of the rinse cycle, and performing subsequent cycles.