Coffee Brewer Phase-Control Brewing for Higher Extraction Temperature
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Solution Overview
Problem
Conventional drip-style coffee brewers often fail to achieve optimal water temperatures for flavor extraction due to inexpensive heating elements, and their lighting systems are inadequate for illuminating dark roasts, leading to inefficient brewing processes and potential LED failure.
Innovation Solution
A coffee brewer with a phase control valve that alternates between water and steam brewing cycles, a solenoid valve for precise water flow control, and an improved lighting system with a heatsink to maintain LED efficiency, ensuring adequate illumination and optimal brewing conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If inexpensive heating elements are used to keep the cost of drip-style coffee brewers low, then the manufacturing cost is reduced, but the water temperature cannot reach optimal levels for flavor extraction
Solution Approach 1:
The patent implements periodic action by alternating between steam brewing cycles and water brewing cycles. During steam cycles, the heating element generates steam to elevate water temperature, and during water cycles, liquid water is delivered for extraction. This periodic alternation allows the system to achieve optimal brewing temperatures using a lower-cost heating element that would be insufficient for continuous high-temperature operation.
Solution Approach 2:
The patent utilizes phase transitions by converting water to steam during the steam brewing cycles. The heating element heats water until it vaporizes, and this steam is then introduced to the coffee grounds. The phase change from liquid to gas releases latent heat, effectively transferring thermal energy to the brewing system and achieving high temperatures without requiring an expensive high-wattage heating element.
2Illumination intensity
If the lighting system illuminates dark roast coffee, then visibility of the brewing process is improved, but LED lifespan is reduced due to heat exposure
Solution Approach 1:
The patent extracts the light-emitting function from the heat-generating function by using an LED that emits light without generating significant heat. The LED is positioned to illuminate the brewing chamber, and any minimal heat produced is dissipated through thermal management features such as heatsinks or positioning away from the hot brewing zone. This separation allows bright illumination of dark roasts without exposing the LED to harmful temperatures.
3Temperature
If a phase control valve is added to alternate between steam and water brewing cycles, then water temperature and flavor extraction are improved, but device complexity increases
Solution Approach 1:
The phase control valve implements periodic action by automatically alternating between steam brewing cycles and water brewing cycles. The valve opens and closes at predetermined intervals to deliver steam during one phase and liquid water during another phase. This automated periodic operation achieves optimal brewing temperatures and flavor extraction without requiring complex manual intervention or multiple separate valve systems.
Solution Approach 2:
The phase control valve serves multiple functions: it controls steam delivery, controls water delivery, regulates flow rates, and manages the timing of different brewing phases. By consolidating these functions into a single multi-functional valve, the system achieves improved temperature control and flavor extraction while minimizing the increase in device complexity compared to using separate valves for each function.
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 coffee brewer achieves higher average water temperatures and enhanced flavor extraction while extending LED lifespan through efficient heat management and improved illumination.
Implementation Method 1
A heating unit disposed upstream from the water inflow port produces the hot water stream
Implementation Method 2
a phase control valve that alternates between a first position permitting a substantial full flow of unheated water to the heating unit during a water brew cycle and a second position substantially restricting full flow of unheated water to the heating unit during a steam brew cycle
Implementation Method 3
The phase control valve includes a solenoid having a central shaft with a hollow plunger movable therein and selectively positionable within a magnetic field
Implementation Method 4
an improved lighting system with a heatsink to maintain LED efficiency
Data Source
AI summary
A brewer for brewing beverages in a brew basket, such as loose coffee or tea, is provided, where the flow of water to the brew basket alternates between water brewing phases and steam brewing phases during a single brew cycle, resulting in comparatively higher temperatures of water in the brew basket than conventional brewers. The frequency and duration of the water brewing phases and steam brewing phases during a brew cycle can be electronically controlled according to one or more predetermined programs. A reinforcing band is also provided for the lighted brew basket interior to strengthen the brewer head bowl in this area, and a single cup insert is also provided.