Pass-Through Dishwasher Drying Zone Control for Steam Containment
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Solution Overview
Problem
Pass-through dishwashers experience energy loss and humidity issues due to high-energy steam and moist air escaping during special operating states, such as when containers or trays are horizontal, leading to inefficient drying and increased energy consumption.
Innovation Solution
The rotation speed of the fan in the drying zone is controlled based on the operating state, reducing air stream flow rate and volume to prevent steam from entering adjacent zones or the room, using sensors to identify special operating states and adjust fan speed accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the fan rotation speed is increased to improve drying efficiency, then the drying performance is improved, but high-energy steam and warm air escape to adjacent zones and the room causing energy loss
Solution Approach 1:
The fan rotation speed is made variable rather than fixed. The control system adjusts the fan speed dynamically based on detected operating states (normal vs. special states like horizontal trays). In normal operation, high speed provides efficient drying; in special states, reduced speed prevents steam escape while maintaining adequate drying function.
Solution Approach 2:
Sensors detect the operating state (e.g., tray orientation, item presence) and provide feedback to the control system. Based on this feedback, the control system automatically adjusts the fan rotation speed to the appropriate level, creating a closed-loop control system that optimizes both drying efficiency and energy conservation.
2Productivity
If the air stream flow rate is increased to enhance moisture removal, then drying effectiveness is improved, but steam enters adjacent treatment zones causing humidity issues and energy waste
Solution Approach 1:
The air stream flow rate is dynamically adjusted through variable fan speed control. During normal operation, high flow rate effectively removes moisture. During special operating states, the flow rate is reduced to prevent steam from escaping into adjacent zones, thereby controlling humidity in those areas while maintaining sufficient drying capability.
Solution Approach 2:
The control system uses sensor feedback about the operating state to automatically regulate the air stream flow rate. When sensors detect conditions that may cause steam escape (such as horizontal trays blocking the air deflection trough), the system reduces the flow rate to prevent harmful humidity buildup in adjacent treatment zones.
3Loss of energy
If the fan speed is reduced to prevent steam escape during special operating states, then energy loss is minimized, but drying effectiveness may be compromised
Solution Approach 1:
The system dynamically adjusts fan speed based on real-time detection of operating conditions. During special states (horizontal trays, containers), reduced speed conserves energy by preventing steam escape. During normal states, full speed maintains optimal drying effectiveness. This dynamic adaptation ensures neither energy waste nor drying compromise.
Solution Approach 2:
Sensor feedback enables the control system to distinguish between normal and special operating states, allowing intelligent adjustment of fan speed. The system reduces speed only when necessary to prevent energy loss, and maintains high speed when drying effectiveness is the priority, optimizing the balance between energy conservation and drying performance.
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 minimizes the escape of high-energy steam and warm air, ensuring sufficient dry air for effective drying and reducing energy losses, maintaining optimal climate conditions within the machine.
Implementation Method 1
the washing liquid which remains on the items which have been washed is removed from the items which have been cleaned partly by being blown off and partly by evaporation
Implementation Method 2
The generally heated washing liquid produces steam (water vapor) when it is sprayed within the respective treatment zone of the cleaning machine
Implementation Method 3
washing liquid is drawn from the reservoir tank associated with this treatment zone by a pump and sprayed over the items to be cleaned through suitably designed nozzles
Implementation Method 4
heated air is blown onto the items which have been washed via discharge nozzles by means of a fan
Data Source
AI summary
A pass-through dishwasher is provided having at least one washing zone, at least one rinsing zone and a drying zone. The pass-through dishwasher is used to clean items to be washed and comprises a conveyor device for conveying the items to be washed through successive treatment zones. The pass-through dishwasher comprises a drying zone which has arranged in it at least one drying fan whose rotation speed can be controlled.