Mixing Valve Actuator Inlet Identification for Accurate Temperature Control
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Solution Overview
Problem
The installation of mixing valves in waterborne heating systems can be incorrect due to ambiguity in connecting inlets, leading to incorrect temperature settings and potential overheating, which can damage floor materials in underfloor heating applications.
Innovation Solution
A method and actuator system that automatically determine the connection of inlets by operating the obturator to different positions and using temperature sensors to provide temperature values to a controller, which determines the relationship between these values to identify the low and high temperature inlets, allowing for accurate configuration without prior experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual installation method is used without automatic determination, then installation process is simple in procedure, but installation accuracy deteriorates leading to incorrect connections
Solution Approach 1:
The mixing valve system performs self-identification of inlet connections by automatically operating the obturator to different positions and measuring temperature differences. The controller determines which inlet is connected to heated water and which to recirculated water through self-testing, eliminating the need for external expertise or complex installation procedures.
Solution Approach 2:
The system uses temperature sensors to provide feedback about the actual temperature at the outlet for each obturator position. Based on this feedback, the controller determines the correct inlet connections and configures the operating directions accordingly, ensuring accurate temperature control.
2Reliability
If automatic determination system is implemented, then installation accuracy is improved, but device complexity increases
Solution Approach 1:
The actuator serves multiple functions: it operates the obturator for temperature control, performs automatic inlet identification by operating the obturator to predetermined positions, and provides feedback to the controller for configuration. This multi-functionality reduces the need for separate identification devices.
Solution Approach 2:
The manual identification process is replaced by an automated system using the motorized actuator and electronic temperature sensors. The mechanical operation of the obturator is controlled electronically, and the identification is performed through automated temperature measurement and logical determination by the controller.
3Measurement precision
If inlet connections are not clearly identified, then installation process is faster, but temperature mode indication accuracy deteriorates
Solution Approach 1:
The system performs preliminary automatic identification of inlet connections during the installation phase before normal operation begins. The controller operates the obturator to predetermined positions and measures temperatures to determine connections in advance, so that the system is correctly configured before entering service.
Solution Approach 2:
The mixing valve system automatically determines its own inlet connections and configures its operating parameters without requiring external assistance or time-consuming manual identification procedures. The self-testing process integrates seamlessly into the installation process.
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 simplifies the installation process, reduces human error, and ensures accurate temperature control, preventing overheating and material damage by automatically determining the correct inlet connections.
Implementation Method 1
a temperature sensor arranged to sense a temperature of the fluid in or downstream of the outlet of the mixing valve
Data Source
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AI summary
The present application discloses a method for automatically determining the connection of inlets of a mixing valve in view of a low temperature fluid inlet and a high temperature fluid inlet. The method comprises: operating, by a motor, an obturator to a first position; providing, by a temperature sensor, at least a first temperature value to a controller; operating, by the motor, the obturator to a second position; providing, by the temperature sensor, at least a second temperature value to the controller; determining, by the controller, a mutual relationship between at least two of the provided temperature values; and determining, by the controller and based on the determined mutual relationship, which of the first inlet and the second inlet being connected to the low temperature fluid inlet and the high temperature fluid inlet, respectively. The present application also discloses an actuator for performing the method, and a system.