Liquid Temperature Calibration and Glide-In Heating Control
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Solution Overview
Problem
Current consumer products such as coffee makers and electric kettles have inadequate temperature control, resulting in significant variations in water temperature, which affects the flavor profile of brewed coffee or tea and the extraction process, with deviations of up to 10° F and 12° F respectively from the target temperature.
Innovation Solution
A system with a calibration feature and a 'glide in' feature for precise temperature control, where the calibration feature accounts for variations in components and the 'glide in' feature slows down the heating rate as the target temperature is approached, using a combination of hardware, software, and external devices for accurate temperature management, including manual or automatic sensors for feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If standard heating components and control systems are used in mass-produced consumer products, then manufacturing cost and device complexity are reduced, but temperature control precision deteriorates with variations up to 10-12° F
Solution Approach 1:
The system performs preliminary calibration by heating water to boiling point and using this known reference temperature to establish a calibration factor. This preliminary action compensates for component variations before actual brewing operations, enabling precise temperature control without requiring expensive precision components throughout the system.
Solution Approach 2:
The system continuously monitors temperature using a temperature sensing component and compares it against the target temperature. Based on this feedback, the control component adjusts the heating component's operation to maintain the desired temperature, compensating for variations in heating rate and component performance.
2Productivity
If heating power is maintained at high levels to reduce heating time, then productivity is improved, but temperature control precision deteriorates due to excessive heating and overshoot
Solution Approach 1:
The system dynamically adjusts the heating power based on the current temperature and proximity to target temperature. At lower temperatures, high power is applied for rapid heating. As the target temperature approaches, power is reduced or cycled off, allowing the thermal mass to coast to the target temperature. This dynamic control enables both fast heating and precise temperature accuracy.
Solution Approach 2:
The control system uses periodic on/off cycling of the heating element near the target temperature. Instead of continuous high-power heating, the system applies heat in periodic pulses or reduced-power intervals, allowing temperature to rise during heating phases and stabilize during off phases, preventing overshoot while maintaining productivity.
3Adaptability or versatility
If precision temperature control features are added to distinguish from competitors, then product differentiation and market appeal are improved, but manufacturing cost increases
Solution Approach 1:
The system achieves precise temperature control by changing the operational parameters of standard, low-cost components rather than replacing them with expensive precision components. The calibration factor and power cycling strategy transform ordinary heating elements and sensors into a precision temperature control system, enabling product differentiation without significant manufacturing cost increase.
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 system achieves a more precise and accurate temperature control, minimizing excessive heating and ensuring the liquid reaches the target temperature within a narrower range, enhancing the flavor consistency and extraction efficiency.
Implementation Method 1
a heating component operatively connected to the control component
Implementation Method 2
a temperature sensing component that determines the temperature of the liquid and communicates a signal representative of a sensed temperature
Data Source
Figure 1
Figure 2
AI summary
Systems to allow temperature control more precise and accurate than the current state of the art for consumer products that heat liquids such as, without limitation, coffee makers, tea makers, electric kettles and espresso machines. One feature of such systems may include the ability to calibrate the system with reference to a known temperature point. Another feature of such system may allow reduction in the rate of water heating to allow the temperature of the water to approach a target temperature in a gradual manner.