Mixer Valve Diagnostics for Flow Restriction and Temperature Control
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Solution Overview
Problem
Digital shower and tap systems face performance loss due to restricted water flow caused by blockages or retrofitted flow restrictors, leading to incorrect temperature control and reduced functionality.
Innovation Solution
A control system that generates a diagnostic signal by comparing current and historical operating signals to detect flow restrictions, allowing for adjustments to the mixer valve to maintain optimal performance, including reducing flow rates or changing target water properties, and sending alerts to users or remote devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the mixer valve unit is provided with remote control functionality and feedback loop for temperature control, then the user experience and functionality are improved, but the system becomes more complex and vulnerable to performance loss from flow restrictions
Solution Approach 1:
The system stores historical operating signals during normal operation to establish a baseline of expected performance. This preliminary data collection enables future diagnostic comparisons without adding real-time complexity to the control mechanism.
Solution Approach 2:
The controller generates diagnostic signals by comparing current operating signals with historical ones, creating a feedback mechanism that detects flow restrictions. This feedback loop maintains system performance without requiring complex real-time monitoring hardware.
2Ease of operation
If flow restrictors or blockages develop in the water supply, then the system becomes easier to operate with lower flow rates, but temperature control accuracy and overall performance deteriorate
Solution Approach 1:
The controller continuously monitors operating signals and compares them against historical data to detect deviations caused by flow restrictions. This feedback enables early detection of performance degradation while maintaining ease of operation.
Solution Approach 2:
The system replaces complex mechanical flow measurement devices with electronic sensing and computational analysis of operating signals. This substitution maintains temperature control accuracy without adding mechanical complexity vulnerable to blockages.
3Reliability
If the controller continuously monitors and compares operating signals to detect flow restrictions, then the reliability and performance maintenance are improved, but the use of energy and computational resources increases
Solution Approach 1:
The controller performs diagnostic comparisons at intervals rather than continuously, using partial monitoring to detect flow restrictions. This approach maintains reliability while significantly reducing energy consumption and computational burden.
Solution Approach 2:
Historical operating signals are stored during normal operation for later comparison. This preliminary data collection during low-energy periods enables reliable detection without requiring continuous high-energy processing.
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 effectively prevents performance loss by detecting and addressing flow restrictions, ensuring consistent temperature control and user experience, while also providing alerts for maintenance or removal of restricting devices.
Implementation Method 1
The controller is configured to generate a diagnostic signal by comparing one or more current operating signals to a corresponding historical operating signal
Implementation Method 2
a mixer valve unit that is provided with a cold water and a hot water input from which a blended output stream is produced
Implementation Method 3
A temperature sensor can be used in the output stream to create a feedback loop in order to control the temperature of the output stream
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A control system (100) for one or more ablutionary devices (1,7). The control system comprises: a mixer valve (118) having a first inlet (134) and a second inlet (136) configured to receive a supply of hot and cold water, and an outlet (138) configured to output cold water, hot water or a mixture thereof as an output stream for suppling water to the one or more ablutionary devices (1, 7) downstream of the mixer valve (118); and a controller 120. The controller (120) is configured to: obtain one or more current operating signals related to the flow rate of the output stream produced by the mixer valve; and compare each of the one or more current operating signals to a corresponding historical operating signal, the historical operating signal being an operating signal previously obtained by the controller; and generate a diagnostic signal based on the comparison. A method performed by the control system (100) is also disclosed.