Bin aeration system
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Solution Overview
Problem
Existing grain bin ventilation systems face challenges in maintaining consistent airflow rates across varying fill levels, leading to inefficient energy use and potential moisture content imbalances, as they are often sized for maximum capacity and may oversize or stall when partially filled.
Innovation Solution
A method and system that utilize a controller to adjust ventilation fan speeds based on real-time static pressure measurements and fill height, calculating optimal airflow rates to maintain desired moisture levels by adjusting fan speeds to match changing grain volumes, ensuring efficient energy use and consistent airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fans run at constant speed to maintain aeration, then airflow is consistent, but energy consumption increases excessively when bin is partially filled
Solution Approach 1:
The fan speed is made dynamic rather than constant. The system continuously monitors static pressure and adjusts fan speed accordingly, allowing the fan to operate at optimal speeds for different fill levels, thereby reducing energy consumption while maintaining adequate airflow.
Solution Approach 2:
The system uses static pressure sensors to provide feedback about the actual airflow conditions. This feedback is fed back to the control system, which then adjusts fan speed to maintain the desired airflow rate, ensuring energy efficiency without sacrificing airflow consistency.
2Quantity of substance
If multiple fans are used to maintain airflow, then adequate air supply is ensured, but undesired periods of no airflow occur when fans are turned off
Solution Approach 1:
Instead of turning fans on and off, the system dynamically adjusts fan speed. This continuous operation at variable speeds eliminates the instability and airflow interruptions that occur when fans are periodically shut down and restarted.
Solution Approach 2:
The system combines multiple fans operating at coordinated variable speeds under a single control system. This allows the fans to work together continuously, with their combined output adjusted dynamically, ensuring uninterrupted airflow while meeting the required air supply volume.
3Reliability
If bin ventilation systems are sized for maximum capacity, then full bin aeration is adequate, but airflow becomes excessive and cools grain too rapidly when bin is partially filled
Solution Approach 1:
The ventilation system uses dynamic speed adjustment based on actual fill level and static pressure conditions. This allows the system to provide adequate airflow for the current grain volume without the excessive cooling that occurs when maximum-capacity fans run at full speed on partially filled bins.
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 allows for precise control of airflow, optimizing energy use and maintaining consistent moisture levels by dynamically adjusting fan speeds according to the grain bin's fill level, thereby enhancing the efficiency of the drying and cooling processes.
Implementation Method 1
The ventilation systems can help ensure that a supply of fresh air and acceptable levels of various properties, such as moisture content, are maintained within the structure. The ventilation systems are generally used to move volumes of air and may include various fan units to move the air.
Implementation Method 2
determining a desired airflow rate based on the fill height level; calculating a control parameter target having a mathematical relationship to a static pressure within the grain bin storage device
Data Source
AI summary
A system for controlling the aeration of a grain bin storage device. The system comprises a grain bin storage device, a ventilation fan, a variable fan drive motor, and a controller configured to receive user input and grain bin storage device parameters. The system controls operation of the ventilation fan at various speeds to maintain a desired volumetric flow rate per bushel of grain. The controller monitors the static pressure within the grain bin storage device and adjusts the speed of the ventilation fan based on an optimal static pressure derived from the user input and grain bin storage device parameters.