Electronic thermostatic radiator valve
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional thermostatic radiator valves, both wax-driven and electronic, face inefficiencies in controlling heat output due to time delays and self-heating effects, leading to inaccurate temperature control and lack of cooling capabilities, with issues like non-linearity, motor slip, system lag, and asymmetric heating.
Innovation Solution
An electronic thermostatic radiator valve with a drive unit powered by electrical power, utilizing a PID controller that communicates wirelessly with a remote device to control the valve position based on temperature rate of change, incorporating features like look-up tables for gain compensation, schedule-adapted gains, and predictive PID algorithms to manage battery life and noise sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a traditional wax-driven thermostatic valve is used, then no additional power source is required, but the response time to temperature changes is delayed and temperature control accuracy deteriorates
Solution Approach 1:
The patent replaces the traditional mechanical wax-driven valve actuation system with an electronic control system. A temperature sensor detects ambient temperature changes and sends signals to a microcontroller, which then actuates an electronic valve through a drive mechanism. This substitution eliminates the thermal inertia and response delays inherent in wax-based mechanical systems, achieving both fast response and accurate temperature control.
2Measurement precision
If an electronic thermostatic radiator valve is used, then temperature control accuracy is improved, but the valve is affected by self-heating from the radiator
Solution Approach 1:
The patent introduces a thermally isolated mounting structure as an intermediary between the temperature sensor and the radiator. The sensor is mounted on a bracket or housing that is thermally decoupled from the radiator body, preventing direct heat transfer from the radiator to the sensor. This intermediary structure eliminates the self-heating effect while maintaining accurate ambient temperature measurement.
3Manufacturing precision
If a stepper motor with gearing is used to control the valve, then precise valve positioning is achieved, but system complexity and dead-spots in the operating range increase
Solution Approach 1:
The patent extracts and eliminates the complex gearing mechanism from the valve actuation system. Instead of using a stepper motor with reduction gears, the invention employs a direct-drive electronic valve actuator that receives control signals from the microcontroller. This extraction of the gearing subsystem simplifies the overall device structure, removes dead-spots associated with gear engagement, and maintains precise valve positioning through electronic control.
4Productivity
If the valve responds quickly to temperature changes, then heating efficiency is improved, but temperature oscillation and overshoot increase
Solution Approach 1:
The patent implements a closed-loop feedback control system where a temperature sensor continuously monitors the ambient temperature and feeds this information back to a microcontroller. The microcontroller adjusts the valve position based on the temperature deviation from the setpoint, implementing proportional-integral-derivative (PID) control algorithms. This feedback mechanism enables the system to respond quickly to temperature changes while automatically dampening oscillations and preventing overshoot, thus maintaining both heating efficiency and temperature stability.
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 solution significantly reduces temperature overshoot and delayed responses, ensuring accurate and efficient heating control compliant with EN15500 and eu.bacA+ standards, while extending battery life and improving system stability and responsiveness.
Implementation Method 1
said drive unit controller comprises a proportional integral derivative (PID) controller for control of the drive unit
Implementation Method 2
Traditional thermostatic valves comprise wax motors that open and close due to thermal expansion or a wax material driven by changes in environment temperature
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A radiator thermostat suitable for an electronic type thermostatic radiator valve comprises a source of electrical power and a drive unit powered by the source of electrical power, the drive unit being operatively connectable to a valve positioner adapted for control of a valve member whereby, in use, the drive unit determines the position of the valve member and thus flow of fluid through a fluid path, the thermostat further comprising a drive unit controller which is sensitive to the temperature of an environment and which is adapted to control the drive unit and thus, in use, the position of said valve member as a function of a rate of change of that temperature.