Coffee machine with heating control system
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Solution Overview
Problem
Existing coffee machines consume excessive energy due to the need to maintain the boiler and dispensing unit at high temperatures even when not in use, despite insulation and component optimization efforts.
Innovation Solution
A coffee machine with a heating control system that adjusts power to the boiler and dispensing unit based on the presence and usage of the filter holder, reducing energy consumption by lowering temperatures when the machine is idle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the boiler and dispensing unit are kept at high temperature (93°C) continuously, then the water temperature for coffee extraction is maintained, but energy consumption increases significantly
Solution Approach 1:
The heating system dynamically adjusts its operation based on filter holder presence. When a filter holder is detected, the system maintains high temperature (93°C) for optimal coffee extraction. When no filter holder is present for a threshold period, the system reduces temperature to a lower standby level, thereby reducing energy consumption while maintaining readiness for the next brewing cycle.
Solution Approach 2:
The system changes the temperature parameter from a fixed high value (93°C) to a variable parameter that can take two states: high temperature (93°C) when brewing is needed, and low temperature (standby mode) when no filter holder is detected. This parameter change resolves the contradiction by adapting temperature to actual usage conditions.
2Use of energy by moving object
If the heating system is turned off during idle periods, then energy consumption is reduced, but the machine cannot provide hot water immediately when needed
Solution Approach 1:
The system performs preliminary heating when a filter holder is detected in the dispensing unit. The control unit activates the heating element in advance to bring the water to the required temperature (93°C) before brewing begins. This ensures that when coffee extraction is needed, hot water is immediately available without delay, while avoiding continuous heating when no filter holder is present.
Solution Approach 2:
The heating system operates periodically rather than continuously. It switches between active heating mode (when filter holder present) and standby mode (when no filter holder present), creating a periodic on-off pattern that reduces energy consumption while maintaining readiness for the next brewing cycle.
3Productivity
If the machine maintains high temperature readiness, then coffee can be dispensed immediately, but energy is wasted during periods of reduced consumption
Solution Approach 1:
The control unit continuously monitors the presence of the filter holder in the dispensing unit and uses this feedback to adjust heating operation. When a filter holder is detected, the system receives feedback to maintain high temperature for immediate coffee dispensing. When no filter holder is present for the threshold period, the feedback triggers a switch to standby mode, reducing energy waste while maintaining productivity readiness.
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
Reduces energy waste by dynamically controlling the heating elements, ensuring efficient temperature maintenance only when needed, thereby saving energy.
Implementation Method 1
a first electric heating resistance (R1) that heats the water
Implementation Method 2
a second electric heating resistance (R2) arranged in the body (41) of the dispenser unit to heat the body (41) of the dispenser unit
Implementation Method 3
the efforts of manufacturers are mainly directed to insulate the coffee machine, and in particular the boiler and the dispensing unit, in order to minimize the heat loss
Data Source
AI summary
A coffee machine having a control unit with a timer configured to count a time after it receives a presence signal indicative of an insertion of the filter holder into the dispensing unit, and a comparator configured to compare the time counted by the timer with a threshold time indicative of a non-use of the coffee machine. The control unit is configured to power a first and second electric resistance, so that the temperature of the water in the boiler and the temperature of the body of the dispensing unit decrease to a stand-by temperature given by a desired temperature minus a preset reduction value.