Grain Bin Headspace-Air Blending for Wider Moisture Windows
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Solution Overview
Problem
Existing grain bin conditioning systems have limited operational time windows for drying or hydrating agricultural products due to narrow temperature and humidity requirements, leading to potential over-drying or over-wetting, particularly near the grain bin plenum.
Innovation Solution
An air conditioning system that mixes high relative humidity (RH) headspace air from the grain bin with low RH ambient air to achieve a target RH level, using a controller to adjust the airflow ratios and incorporate a humidifier or heater to regulate moisture content effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If ambient air is used for conditioning agricultural products, then the system is simple to operate, but the operational time window is limited due to narrow temperature and humidity requirements
Solution Approach 1:
The patent combines headspace air (high RH) and ambient air (low RH) in a mixer to create conditioned air with optimal RH for drying. This merging of air sources extends the operational time window by allowing the system to operate whenever ambient air is available, not just when headspace air meets specific RH requirements, thus resolving the contradiction between extended operation time and system complexity.
Solution Approach 2:
The system dynamically adjusts the RH parameter of the air mixture by varying the ratio of headspace air to ambient air. By controlling the RH parameter through this mixing process, the system can maintain optimal drying conditions for extended periods, overcoming the limitation of narrow operational windows associated with using single air sources.
2Manufacturing precision
If heated or unheated ambient air is introduced to dry agricultural products, then the process is straightforward, but over-drying or over-wetting occurs near the grain bin plenum
Solution Approach 1:
The system uses RH sensors to continuously monitor the moisture content and RH levels in the grain bin. This feedback information is used to dynamically adjust the mixing ratio of headspace air and ambient air, ensuring precise control over the drying process and preventing over-drying or over-wetting, while maintaining operational simplicity through automated control.
Solution Approach 2:
The patent applies different air sources to different zones within the grain bin. Headspace air (high RH) is used near the plenum where drying is needed, while ambient air (low RH) is used in other zones. This localized application of different air qualities enables precise moisture content control throughout the grain mass without complicating the overall operation.
3Reliability
If headspace air with high RH is used for conditioning, then the moisture content regulation is improved, but the air source becomes limited to within the grain bin headspace
Solution Approach 1:
The system makes both headspace air and ambient air useful by mixing them in appropriate ratios. The mixer component enables the system to utilize ambient air (which would otherwise be underutilized) in conjunction with headspace air, creating a versatile air conditioning system that can operate in various conditions and locations within the grain bin, thus resolving the contradiction between reliable moisture regulation and air source flexibility.
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 system extends the operational time for conditioning agricultural products, reducing the risk of over-drying or over-wetting by allowing more flexible and precise control over moisture content regulation.
Implementation Method 1
mixes the high RH headspace air with low RH ambient air to get optimum RH for conditioning
Implementation Method 2
The air mixture having the target relative humidity level is provided to a grain bin plenum to permeate through the agricultural product to regulate the agricultural product's moisture content
Data Source
AI summary
An air conditioning system and methods of use regulate a moisture content of an agricultural product in a grain bin. The system receives headspace air from the headspace of the grain bin, which generally has a higher moisture content than ambient air. The system further receives ambient air and mixes the headspace air and the ambient air into a ratio comprising a target moisture content. The air mixture is provided into a grain bin plenum, where it then permeates through to agricultural product, thereby regulating the moisture. The system and method can be used to bring the agricultural product to a target moisture content that is preferred when storing the agricultural product.