Espresso Brew Group With Mixed-Water Temperature Control
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Solution Overview
Problem
Existing espresso coffee machines with multiple heating stages face challenges in achieving precise control of coffee delivery temperature due to thermal inertia and increased complexity, which limits flexibility and energy efficiency.
Innovation Solution
A brew group with a holding chamber having multiple inlets for cold and heated water, controlled by valves and heating means, allows for dynamic temperature control within a specific range during infusion, optimizing the coffee delivery temperature and reducing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a second heating stage is added to increase temperature control capability, then temperature control precision is improved, but device complexity increases
Solution Approach 1:
The patent combines the holding chamber and infusion chamber into a single integrated brew group assembly. The holding chamber stores preheated water while the infusion chamber performs extraction, and both are thermally coupled through shared walls and proximity. This merging allows temperature control functions to be achieved through the combined thermal mass and geometry of the integrated structure, avoiding the need for separate heating stages and reducing overall device complexity.
Solution Approach 2:
The infusion chamber is positioned within or adjacent to the holding chamber, creating a nested configuration where the extraction process occurs within the thermal environment established by the holding chamber. This nesting allows the inner chamber to benefit from the thermal field of the outer chamber, enabling precise temperature control through passive thermal coupling rather than active heating elements, thus improving temperature precision without adding complex heating stages.
2Stability of the object's composition
If indirect heating through a heating device is used, then temperature stability is improved, but thermal inertia increases
Solution Approach 1:
The holding chamber preheats water in advance before it reaches the infusion chamber. By storing preheated water at the target temperature in the holding chamber, the system eliminates the need for rapid heating during extraction, thereby reducing thermal inertia effects. The water is prepared thermally beforehand, allowing immediate use without temperature fluctuations that would occur with indirect heating during the extraction process.
3Ease of manufacture
If the brew group configuration is simplified for easier installation, then ease of manufacture is improved, but adaptability to different machine configurations decreases
Solution Approach 1:
The brew group is designed as a universal module that can function in multiple machine configurations. The holding chamber and infusion chamber are configured with standardized connection interfaces and dimensions that allow the same brew group assembly to be installed in various espresso machine models and configurations. This universal design enables the brew group to adapt to different machine layouts, boiler positions, and control systems without requiring custom manufacturing, thereby maintaining both ease of manufacture and high adaptability.
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 brew group enables instantaneous control of coffee delivery temperature, reducing thermal variations and energy usage, while providing flexibility in installation and operation, achieving optimal extraction profiles and energy efficiency.
Implementation Method 1
a heating element (46) of predetermined power connected to the control unit (18)
Implementation Method 2
an heat exchanger comprised into a boiler
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
This invention relates to a brew group for an infusion machine, in particular a machine for espresso coffee, comprising infusion means (43, 43b) designed for the preparation of infusions, a holding chamber (41) hydraulically connected to the said infusion means (43, 43b) and comprising at least two liquid inlets (411) allowing the delivery of liquids and heating means (46) capable of directly heating the liquids delivered to the holding chamber (41) through the inlets such as to hydraulically feed the infusion means (43, 43b) for the preparation of infusions. The invention also relates to a machine which comprises the brew group and a method for operating the machine.