Refractance Window Dryer Airflow for Uniform Belt Drying
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Solution Overview
Problem
Traditional drying systems face inefficiencies due to uncontrolled humidity and temperature variations, leading to inconsistent dryer performance and product quality, and fail to effectively utilize heat gain and air moisture capacity, resulting in increased airflow requirements.
Innovation Solution
A low profile design air tunnel system with a conditioned air supply manifold that directs airflow across the entire width of the drying belt, combined with an exhaust manifold to manage moisture, creating a counter-current airflow that enhances heat transfer and reduces airflow needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional drying systems use uncontrolled ambient air for drying, then the system structure is simple, but dryer performance varies widely due to uncontrolled humidity and temperature
Solution Approach 1:
The system pre-cools and pre-humidifies the air before it enters the drying chamber, preparing the air in advance to optimize its moisture-carrying capacity and ensure consistent drying performance regardless of ambient conditions
Solution Approach 2:
The system actively controls and adjusts air temperature and humidity parameters through pre-cooling and pre-humidification stages, transforming uncontrolled ambient air into conditioned air with optimized properties for consistent drying
2Productivity
If traditional systems increase product temperature to raise water vapor pressure, then evaporation rate increases, but excessive thermal energy is conducted from heated water through the drying belt
Solution Approach 1:
The system extracts and removes the drying belt from the heated water bath, eliminating unnecessary thermal conduction through the belt and preventing excessive heat transfer that would increase product temperature beyond what is needed for optimal drying
Solution Approach 2:
The system converts the previously harmful effect of excessive heat conduction through the belt into a benefit by removing the belt, thereby preventing energy waste while maintaining effective drying through optimized air flow
3Ease of operation
If traditional multi-chamber systems use high profile design with lateral airflow, then air can be introduced along one side, but air short circuits and does not distribute across the entire belt width
Solution Approach 1:
The system inverts the traditional high profile design by using a low profile configuration where air is introduced at the bottom and flows upward, preventing short-circuiting and ensuring uniform distribution across the entire belt width
Solution Approach 2:
The system changes the airflow dimension from lateral horizontal flow to vertical upward flow, introducing air from the bottom dimension and allowing it to rise uniformly across the belt, eliminating the short-circuiting problem of traditional designs
4Ease of manufacture
If traditional systems use elevated hood design with high CFM flowrate, then air can be supplied easily, but air flows high above the belt surface and temperature gain is not utilized
Solution Approach 1:
The system inverts the elevated hood design by placing the air supply at the bottom rather than at the top, causing air to flow upward close to the belt surface where it can effectively absorb heat from evaporation rather than flowing high above the belt
Solution Approach 2:
The system uses pneumatic principles to generate a low-profile air tunnel that confines the air flow close to the belt surface, ensuring that the air remains in contact with the drying area and充分利用 the heat gain from evaporation
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
The system achieves uniform air flow, improves dryer throughput, reduces airflow requirements by up to 10 times, and ensures consistent drying characteristics, resulting in higher quality and more efficient product drying.
Implementation Method 1
A low profile design air tunnel system with a conditioned air supply manifold that directs airflow across the entire width of the drying belt
Implementation Method 2
The perpendicular flow across the belt did not take full advantage of the heat gained from the evaporation of the water from product on belt
Implementation Method 3
Heat is transferred by conduction from the circulated heated water directly to the product through a belt of a polymer membrane
Data Source
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AI summary
A low profile design air tunnel system and method for providing uniform air flow in a refractance window dryer are disclosed. According to one embodiment, a system comprises a conditioned air supply manifold that provides air into a drying chamber. The system has a drying belt directed through the drying chamber. A feed application tray at a first end of the drying belt applies a liquid to the drying belt. The system has an exhaust manifold located at the first end of the drying belt.