Heating Element Scale Detection Using Temperature Behavior Monitoring
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Solution Overview
Problem
Existing methods for detecting scale on heating elements in household appliances are not accurate and reliable, often requiring heating to boiling point, which can damage the element and is inefficient.
Innovation Solution
A method that measures the temperature behavior of the heating element over time to determine if the scale deposition exceeds a reference amount by comparing the heating duration to a reference heating duration, allowing for scale detection without heating to damaging temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional scale detection methods heat water to boiling temperature to detect scale, then scale detection can be performed, but the heating element may be damaged and the method is inefficient
Solution Approach 1:
The patent applies preliminary action by measuring the temperature of the heating element before heating begins (at ambient temperature) and comparing it to a reference temperature. This allows scale detection to occur before the heating element is subjected to high temperatures that could cause damage, thereby resolving the contradiction between reliable scale detection and preventing heating element damage.
2Measurement precision
If conventional methods measure temperature during boiling to detect scale, then scale presence can be indicated, but the measurement procedure is complex and requires boiling water
Solution Approach 1:
The patent simplifies the measurement procedure by performing temperature measurement at the beginning of the heating cycle before water reaches boiling point. This preliminary measurement approach maintains scale detection accuracy while eliminating the complexity of monitoring boiling conditions, directly resolving the contradiction between measurement precision and device complexity.
3Reliability
If heating element is heated to boiling temperature for scale detection, then scale can be detected, but energy is wasted and heating time is excessive
Solution Approach 1:
The patent performs scale detection as a preliminary action before initiating full heating cycles. By measuring and comparing the heating element temperature at ambient conditions against a reference value, the system reliably detects scale presence without consuming the energy required to heat water to boiling, thus resolving the contradiction between detection reliability and energy loss.
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 method provides a simple and reliable way to determine if scale deposition on heating elements exceeds a reference amount, preventing damage and maintaining appliance efficiency without the need for boiling-point measurements.
Implementation Method 1
a transfer of thermal energy between the heating element and the liquid is possible
Data Source
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Figure 3
AI summary
A method (100) for determining if an amount of deposition of scale, on a heating element (1) arranged for heating a liquid in a heating space (3) of a household appliance (5), exceeds a reference amount of deposition of scale or not is provided. The method (100) comprises: measuring (101) temperature (T) of the heating element (1), obtaining (103) a start temperature (T0) of the heating element (1) corresponding to a liquid start temperature (T0L) of the liquid in the heating space (), turning on (105) the heating element (1) at first point in time (t1) to heat the liquid from the liquid start temperature (T0L) and simultaneously starting measuring a time interval (tint) from the first point in time (t1), monitoring (107), at a second point in time (t2), a behaviour (TBE) of the measured temperature (T) of the heating element (1) during heating of the liquid in the heating space () in order to determine if a boiling temperature of the liquid has been reached or not, wherein the time interval (tint) is measured to the second point in time (t2), comparing (109) the measured time interval (tint) with a reference heating duration (trd) required for heating the liquid from the liquid start temperature (T0L) to the boiling temperature of the liquid when heated by a reference heating element having the reference amount of deposition of scale and determining (111) if the amount of deposition of scale on the heating element (1) exceeds the reference amount of deposition of scale or not based on the monitoring (107) and on the comparison (109). Further, a household appliance (3) comprising a heating element (1) is provided.