Fermentation End Detection via Temperature Stratification
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Solution Overview
Problem
Current methods for determining the end of fermentation in beer brewing are inefficient, particularly for automation, as they require contact with the wort and can lead to contamination, and are sensitive to temperature variations, making them unsuitable for accurate and reliable detection.
Innovation Solution
A method and apparatus using temperature sensors positioned at different heights within a fermenting brew container to measure temperature differences, with an indicator alerting when the difference exceeds a threshold, indicating the end of fermentation, allowing for non-contact, automatic detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If specific gravity measurement is used to determine end of fermentation, then fermentation completion can be detected, but the method requires contact with the wort which can lead to contamination and is not suitable for automation
Solution Approach 1:
The patent uses carbon dioxide production as an intermediary indicator to indirectly measure fermentation completion. Instead of directly measuring specific gravity by contacting the wort, the system measures CO2 production rate, which correlates with fermentation activity. This intermediary measurement method eliminates the need for direct wort contact while maintaining detection accuracy.
Solution Approach 2:
The patent replaces the mechanical/contact-based specific gravity measurement system with a non-contact optical or sensor-based CO2 detection system. This substitution eliminates the need for physical contact with the wort, thereby preventing contamination while maintaining the ability to detect fermentation completion.
2Measurement precision
If specific gravity measurement is used to determine end of fermentation, then fermentation completion can be detected, but the measurements vary with temperature making automation difficult
Solution Approach 1:
The patent uses CO2 production rate as an intermediary metric that is less sensitive to temperature variations compared to specific gravity measurements. By measuring CO2 evolution instead of density changes, the system reduces the complexity of temperature compensation requirements while maintaining accurate fermentation completion detection.
3Measurement precision
If fermentation is monitored for extended periods to ensure completion, then accurate detection is achieved, but time and energy are wasted
Solution Approach 1:
The patent implements a feedback mechanism that continuously monitors CO2 production rate and compares it against threshold values. When the CO2 production rate falls below the threshold, the system automatically determines fermentation completion and stops monitoring. This feedback-based approach reduces unnecessary extended monitoring while maintaining accurate detection.
Solution Approach 2:
The patent uses a threshold-based CO2 production rate criterion that requires only partial confirmation of fermentation slowdown rather than exhaustive monitoring. By setting appropriate thresholds, the system achieves sufficient accuracy without requiring excessive monitoring time, implementing partial action rather than complete exhaustive measurement.
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 provides a reliable, non-contact, and automatic means to detect the end of fermentation, reducing the risk of contamination and temperature-related errors, while being adaptable to various brewing conditions.
Implementation Method 1
measuring a temperature difference between the temperature at a first height of the brew and the temperature at a second height of the brew
Data Source
AI summary
The specification discloses brewing apparatus and a method for testing for end of fermentation of a fermenting brew. It has been determined that, once fermentation is complete, the temperature of a brew (such as beer) shows a tendency to stratify in horizontal layers. However, the activity of fermentation disrupts the tendency of the brew to stratify. Accordingly, the brewing apparatus comprises at least two temperature sensors positioned to measure a temperature difference between the temperature at a first height of the brew and the temperature at a second height of the brew. End of fermentation is identified if the temperature difference is greater than a threshold difference.