Mixer Valve Flow Diagnostics for Shower Temperature Control
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Solution Overview
Problem
Digital shower/tap systems experience performance loss due to restricted water flow caused by blockages or flow restrictors, leading to incorrect temperature control and reduced functionality.
Innovation Solution
A control system for ablutionary devices that includes a mixer valve and a controller to compare current operating signals with historical signals, generating a diagnostic signal for flow restrictions, allowing for adjustments to maintain optimal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the shower system operates over time, then the system provides continuous water supply and temperature control functionality, but flow restrictions develop due to deposit build-up in outlet holes or filters, causing performance loss
Solution Approach 1:
The system performs preliminary diagnostic actions by comparing current flow rate measurements against historical baseline values established during or shortly after installation. This preliminary comparison enables early detection of flow restrictions before they significantly degrade temperature control performance, allowing for timely maintenance intervention.
Solution Approach 2:
The system implements a feedback mechanism where flow rate measurements are continuously monitored and compared against stored baseline values. When deviations exceed a threshold, the system generates a diagnostic indication alerting users to potential flow restrictions. This closed-loop feedback enables ongoing reliability monitoring throughout the system's operational life.
2Adaptability or versatility
If outlet diverters or flow restrictors are retro-fitted by the user, then the system provides additional functionality or flow control options, but the original flow rate is reduced, leading to incorrect temperature control
Solution Approach 1:
The system establishes a baseline flow rate measurement during or shortly after installation, before any user modifications. This preliminary baseline serves as a reference point for future comparisons, enabling the system to detect when user-installed diverters or restrictors cause deviations from the original manufacturer-specified flow conditions.
Solution Approach 2:
The system continuously monitors flow rate and compares it against the stored baseline. When restrictions are detected, the system provides feedback through diagnostic indications, informing users that their modifications have impacted system performance. This enables users to understand the relationship between their adaptability choices and the resulting temperature control precision.
3Loss of substance
If flow rate is restricted compared to design specifications, then the system may reduce water consumption, but performance is lost including incorrect temperature control
Solution Approach 1:
The system implements continuous flow rate monitoring with feedback comparison against baseline values. When flow restrictions are detected that indicate performance degradation, the system generates diagnostic indications alerting users to the issue. This feedback mechanism enables users to balance water consumption reduction against maintained temperature control reliability.
Data Source
AI summary
A control system for one or more ablutionary devices includes a mixer valve having a first inlet and a second inlet configured to receive a supply of hot and cold water, and an outlet 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 downstream of the mixer valve; and a controller. The controller is configured 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 to generate a diagnostic signal based on the comparison.