Espresso Brew Group With Dual-Stage Heating for Precise 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, making them inflexible and inefficient in terms of electrical power usage.
Innovation Solution
A brew group with a holding chamber having multiple inlets for cold and heated water, equipped with programmable valves and a heating element, allows for dynamic temperature control within a specific range during the infusion stage, optimizing coffee delivery temperature and reducing power 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 system is divided into two independent heating stages: a boiler for bulk water heating and a brew group with heating element for precise temperature control at the infusion chamber. This segmentation allows each stage to be optimized independently, achieving precise temperature control without proportionally increasing overall system complexity.
Solution Approach 2:
The boiler pre-heats the water to near-infusion temperature before it enters the brew group. This preliminary action reduces the heating burden on the second stage, allowing simpler temperature control mechanisms to achieve precise final temperature control.
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 heating system is segmented into two stages with different thermal characteristics. The boiler provides stable bulk heating, while the brew group's heating element provides rapid, direct heating to the infusion chamber, minimizing thermal inertia while maintaining stability.
Solution Approach 2:
The system changes the heating parameter from indirect thermal conduction through thick walls to direct heating elements in contact with the infusion chamber. This parameter change reduces thermal inertia while the control system maintains temperature stability through feedback regulation.
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 be installed in various machine configurations. It incorporates standardized mounting interfaces and flexible conduit connections, allowing the same basic design to adapt to different machine layouts while maintaining ease of manufacture.
Solution Approach 2:
The brew group incorporates flexible elements and adjustable components that allow it to adapt dynamically to different installation positions and machine configurations. This dynamic design maintains manufacturing simplicity while increasing versatility.
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 configuration enables instantaneous control of coffee delivery temperature, reducing thermal inertia and power requirements, allowing for flexible operation and efficient energy use, with the ability to maintain optimal temperature variations within +/- 4-5 degrees during espresso preparation.
Implementation Method 1
a heating element, allows for dynamic temperature control within a specific temperature range during the infusion stage
Implementation Method 2
an apparatus for supplying hot water to a brewing device by means of 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.