Vacuum Coffee Extraction Flow Control to Reduce Heat Loss
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Solution Overview
Problem
Conventional coffee brewers using vacuum technology struggle to produce large quantities of coffee while maintaining the beverage at a suitable temperature, as the vacuum flow rate necessary for extraction leads to excessive heat loss due to the coffee spraying into a collection chamber, exposing a large surface area to cooling.
Innovation Solution
A beverage brewing system with a flow control device that manages the vacuum applied to the coffee brewing chamber, allowing for a continuous, cohesive flow during initial extraction and a turbulent spray at the end to reduce heat loss, utilizing a rocking piston vacuum pump and adjustable vacuum flow rates to maintain temperature and dry coffee grounds effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a high vacuum flow rate is used to extract large quantities of coffee quickly, then productivity is improved, but heat loss increases due to excessive spraying and surface area exposure
Solution Approach 1:
The system dynamically adjusts the vacuum flow rate during the extraction process. It operates at a higher flow rate during initial extraction to maximize productivity, then reduces the flow rate during final extraction to minimize heat loss and spraying. This dynamic adjustment resolves the contradiction between extraction speed and temperature maintenance.
Solution Approach 2:
The extraction process is divided into distinct phases with different vacuum flow rates. The first phase uses high vacuum for rapid extraction, while the second phase uses reduced vacuum for gentle finishing. This periodic variation in operating conditions allows the system to achieve both high productivity and low heat loss at different stages.
2Loss of energy
If a long extraction process is used to maintain temperature and reduce spraying, then heat loss is minimized, but productivity decreases making the process impractical for commercial use
Solution Approach 1:
Rather than using a consistently long extraction process, the system uses dynamic vacuum flow rate adjustment to achieve both temperature maintenance and commercial productivity. The high initial flow rate enables fast extraction, while the subsequent reduction maintains temperature without requiring an excessively long overall process.
Solution Approach 2:
The system performs the majority of extraction work during the initial high-vacuum phase, extracting most of the coffee quickly before reducing the vacuum flow rate. This preliminary action at high speed reduces the total time needed while maintaining temperature during the final, lower-speed phase.
3Productivity
If vacuum flow rate is increased to reduce extraction time, then productivity is improved, but coffee grounds become wetter requiring additional drying time
Solution Approach 1:
The system uses dynamic vacuum flow rate control to balance extraction speed and grounds drying. By reducing the vacuum flow rate during final extraction, it minimizes the amount of water remaining in the grounds, thereby reducing the drying time needed while still maintaining high overall productivity through the initial fast extraction phase.
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 effectively maintains the coffee at a higher temperature, suitable for commercial use, while efficiently drying coffee grounds, reducing the overall extraction time and minimizing heat loss, with temperature increases of up to 20°F achieved by controlling vacuum flow rates.
Implementation Method 1
a vacuum source in fluid communication with the beverage chamber
Implementation Method 2
directing a beverage formed from the hot water and solids from the brew chamber to a beverage chamber under a force applied to the brew chamber by a vacuum source
Implementation Method 3
controlling vacuum flow rates to maintain temperature and minimize heat loss, with temperature increases of up to 20°F achieved
Data Source
AI summary
Temperature control for extracted beverages, including coffee, via controlled vacuum, and associated systems and methods are shown. A representative system includes a brew chamber, a beverage chamber in fluid communication with the brew chamber, a vacuum source in fluid communication with the beverage chamber, and a flow control device positioned to vary the force applied by the vacuum chamber on the brew chamber via the beverage chamber.