Coffee-making apparatus and method
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Solution Overview
Problem
Conventional stove-top coffee-makers and existing designs like WO2016/059426A1 fail to maintain optimal brew temperature and pressure for espresso coffee due to uncontrolled flow rates and insufficient cooling of brew water, leading to sub-optimal brewing conditions.
Innovation Solution
A coffee-making apparatus with a water delivery system that includes a conduit and valve to control the flow rate of brew water, using a cooling apparatus to regulate the temperature and pressure, and a conduit design with specific dimensions to generate a pressure drop, ensuring brew water cools to the desired temperature before entering the coffee chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a saturated boiler is used to generate brew pressure, then the system complexity is reduced, but the brew temperature becomes too high (exceeding 100°C) and cannot be controlled to the optimal espresso range
Solution Approach 1:
The system is divided into two independent subsystems: a saturated boiler subsystem for generating brew pressure, and a separate heat exchanger subsystem for controlling brew temperature. This segmentation allows each subsystem to be optimized independently - the boiler for pressure generation and the heat exchanger for temperature regulation - resolving the contradiction between system simplicity and temperature control.
Solution Approach 2:
A heat exchanger acts as an intermediary component between the saturated boiler and the brew chamber. The heat exchanger receives hot brew water from the boiler, cools it to the optimal espresso temperature range (90-96°C), and then delivers it to the coffee. This intermediary component enables temperature control without requiring a complex electric heating system.
2Productivity
If the valve opens fully to deliver brew water quickly, then the brewing speed increases, but the flow rate becomes uncontrolled and the brew water does not cool sufficiently
Solution Approach 1:
The valve is designed to dynamically adjust its opening degree based on real-time feedback from flow rate and temperature sensors. Rather than being fully open or completely closed, the valve modulates its position to maintain optimal flow rate and temperature, allowing the system to achieve both fast brewing and sufficient cooling through active control.
Solution Approach 2:
The system incorporates feedback control mechanisms where sensors monitor the flow rate and temperature of brew water, and this information is used to adjust the valve opening degree. This closed-loop control ensures that the brew water is delivered at the correct temperature and flow rate, resolving the contradiction between brewing speed and cooling efficiency.
3Reliability
If conventional electric pumps and control systems are used, then precise pressure and temperature control is achieved, but the device size and cost increase significantly
Solution Approach 1:
The invention replaces complex electric pumps and electronic control systems with a mechanically-driven saturated boiler system. The boiler uses steam pressure to naturally push brew water through the system, eliminating the need for electric pumps. Temperature and pressure control are achieved through mechanical heat exchanger design and valve mechanisms rather than electronic controls, significantly reducing device complexity and cost while maintaining reliability.
Solution Approach 2:
The saturated boiler system is self-regulating, using the phase change of water to steam to automatically maintain consistent pressure. The heat exchanger passively cools the brew water through thermal conduction to a heat sink, eliminating the need for active cooling systems. This self-service approach reduces mechanical and electronic components while ensuring consistent brewing parameters.
4Productivity
If the conduit is designed for high flow rate, then the brewing efficiency increases, but the pressure drop becomes insufficient to maintain optimal brew pressure
Solution Approach 1:
The conduit design parameters (diameter, length, material, insulation) are optimized to achieve the right balance between flow rate and pressure drop. By carefully selecting these parameters, the system maintains sufficient pressure to drive brew water through the coffee at the correct flow rate, resolving the contradiction between brewing efficiency and pressure maintenance through parameter optimization rather than system complexity.
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 apparatus achieves consistent espresso brewing by maintaining the brew water at the desired temperature and pressure throughout the brewing process, ensuring even extraction of flavor and aroma.
Implementation Method 1
a cooling apparatus for cooling the heated brew water before it reaches the coffee chamber
Implementation Method 2
the water delivery system is configured to generate a pressure drop between the brew-water chamber and the valve inlet, the magnitude of which depends on the flow rate of brew water through the water delivery system
Implementation Method 3
a water delivery system for delivering heated brew water from the brew-water chamber to the coffee chamber
Data Source
AI summary
A coffee-making apparatus has a brew-water chamber for containing heated brew water, a coffee chamber, a water delivery system for delivering heated brew water from the brew-water chamber to the coffee chamber, and a cooling apparatus for cooling the heated brew water before it reaches the coffee chamber. The water delivery system comprises a conduit and a valve, openable when the pressure at a valve inlet reaches a valve opening pressure, for controlling a flow of brew water into the coffee chamber. The water delivery system is configured to control the flow rate of brew water while the coffee chamber is filling with brew water. A method of making coffee is also provided.