Controlled Ventilation Curing for Uniform Tobacco Humidity
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Solution Overview
Problem
Large-scale tobacco curing systems face challenges in maintaining uniform humidity and temperature conditions, leading to non-uniform curing of tobacco, especially in centralized curing setups where variables such as weather, barn conditions, and tobacco packing density affect the curing process, resulting in inconsistent quality.
Innovation Solution
A modular air curing system with controlled ventilation, thermal conditioning, and remote monitoring, featuring internal and external sensors, programmable monitoring and control systems, high-volumetric-flow-rate fans, humidity augmentation, and heating systems to regulate temperature and humidity within enclosures, ensuring uniform curing conditions across multiple modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If large-scale centralized curing systems are used to accommodate multiple harvests, then productivity increases, but manufacturing precision deteriorates due to non-uniform temperature and humidity distribution
Solution Approach 1:
The curing system is divided into multiple independent modular enclosures, each capable of operating autonomously with its own ventilation and temperature control systems. This segmentation allows each module to maintain uniform curing conditions while the overall system handles large volumes of tobacco across multiple harvests.
Solution Approach 2:
The system employs dynamically adjustable ventilation components including variable speed fans and controllable vents that can adapt airflow rates in real-time. This dynamic control enables precise regulation of temperature and humidity gradients within each enclosure, maintaining curing uniformity despite varying loads and external conditions.
2Use of energy by moving object
If ambient air is used for ventilation, then energy consumption decreases, but temperature and humidity control precision deteriorates due to weather variability
Solution Approach 1:
The system changes the parameters of ventilation air by heating or cooling ambient air to predetermined temperatures before introducing it into the curing enclosure. This parameter adjustment allows the system to maintain precise temperature and humidity control while still utilizing ambient air as the base source, balancing energy efficiency with control precision.
Solution Approach 2:
Air is pre-conditioned (heated or cooled) before being introduced into the curing enclosure. This preliminary action ensures that the air enters at the correct temperature and humidity parameters, preventing adverse weather conditions from disrupting the curing environment and eliminating the need for continuous high-energy correction during the curing process.
3Device complexity
If manual monitoring and adjustment methods are used, then device complexity decreases, but measurement precision and control reliability deteriorate
Solution Approach 1:
The system incorporates continuous feedback loops where sensors monitor temperature and humidity parameters in real-time, and this data automatically feeds back to control systems that adjust ventilation and heating accordingly. This automated feedback mechanism maintains high measurement precision and control reliability while managing complexity through systematic design.
Solution Approach 2:
The curing system is designed to self-regulate through automated control algorithms that process sensor data and adjust operational parameters without human intervention. The system monitors its own performance and makes self-correcting adjustments, eliminating the need for complex manual monitoring procedures while maintaining high precision through consistent automated measurement and control.
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 ensures consistent and uniform curing of tobacco by maintaining predetermined humidity and temperature schedules, reducing the impact of adverse weather and tobacco packing density, resulting in improved quality and efficiency of the curing process.
Implementation Method 1
The sidewall fan is operable to deliver ambient air into the enclosure when internal temperature and humidity conditions can be adjusted with air at ambient conditions
Implementation Method 2
The sidewall fan is operable to forcibly exhaust air from the enclosure to the atmosphere when temperature and/or humidity conditions inside the enclosure cannot be adjusted by ingestion of ambient air
Implementation Method 3
A humidity augmentation system may also be provided in the enclosure to distribute added moisture in the enclosure so as to adjust air humidity inside the enclosure
Implementation Method 4
For those times when the ambient temperature is too low or ambient humidity is too high, an air heating system for the sidewall fan may be provided
Implementation Method 5
the enclosure preferably may include an internal air circulation system operable to provide generally uniform temperature and humidity conditions throughout the enclosure
Data Source
AI summary
A tobacco curing enclosure includes roof vents, sidewall fan assemblies with heaters, a humidity augmentation system, and internal air circulation devices. Internal temperature and humidity monitors are connected with a control system for the fans, vents, heaters, humidity augmentation system and air circulation devices. The control system in conjunction with the enclosure allows humidity inside the enclosure to be controlled according to a predetermined schedule despite the ambient weather conditions, thereby enhancing the quality of cured tobacco.