Thermal Valve Closing Detection for Stepwise Heat Exchanger Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing valve control systems for heating or cooling fluid in heat exchangers face inefficiencies due to energy wastage from oscillating valve movements and non-linear current consumption during position detection, especially when using electric actuators, and lack precise control over the valve's opening degree.
Innovation Solution
A valve arrangement utilizing two temperature sensors with different thermal resistances to detect the valve's opening condition by comparing ambient and valve-proximal temperatures, combined with an electric stepping motor actuator that opens step-wise and pauses between groups of steps, allowing for precise control and energy-efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If force-based detection method is used to determine valve opening degree, then valve position information can be obtained, but electrical energy consumption increases non-linearly
Solution Approach 1:
The patent replaces the mechanical force-based detection system with a thermal detection system. Instead of measuring the mechanical force required to move the valve element, the invention uses temperature sensors to detect thermal changes in the valve housing that occur when the valve opens or closes. This substitution eliminates the non-linear electrical energy consumption associated with force measurement while providing accurate valve position information.
Solution Approach 2:
The patent introduces thermal energy as an intermediary to detect valve position. The temperature sensors act as intermediaries that detect thermal changes in the valve housing caused by fluid flow when the valve opens or closes. This indirect thermal measurement approach provides valve position information without requiring direct mechanical force measurement, thereby reducing energy consumption.
2Measurement precision
If continuous valve actuation is performed to maintain precise control, then valve position accuracy is maintained, but energy wastage occurs from oscillating movements
Solution Approach 1:
The patent implements periodic thermal detection instead of continuous mechanical actuation. The temperature sensors periodically detect thermal changes in the valve housing to determine valve position, allowing the control system to maintain accurate knowledge of valve state without continuous actuation. This periodic thermal monitoring eliminates energy-wasting oscillating movements while preserving control accuracy.
Solution Approach 2:
The patent uses thermal feedback from temperature sensors to monitor valve position and state. The control system receives feedback about valve opening/closing events through temperature changes in the valve housing, enabling precise control decisions without requiring continuous mechanical actuation. This feedback mechanism maintains control accuracy while minimizing energy consumption by acting only when necessary.
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 enables accurate detection of the valve's opening degree and closing condition with reduced energy consumption, optimizing valve control and minimizing unnecessary actuation, thereby improving the overall efficiency of heating or cooling fluid management.
Implementation Method 1
a thermal resistance between the first temperature sensor and the valve being greater than a thermal resistance between the second temperature sensor and the valve
Data Source
Figure 1
AI summary
A valve arrangement is provided, (1) comprising: a valve (2) for controlling a flow of heating or cooling fluid through a heat exchanger, an actuator (12) for actuating said valve (2), control means (15) for controlling said actuator (12), a first temperature sensor (18) connected to said control means (15), a thermal resistance between the first temperature sensor (18) and the valve (2) being greater than a thermal resistance between the second temperature sensor (19) and the valve (2). It is intended to improve control of the valve. To this end the first temperature sensor (18) and the second temperature sensor (19) are part of detector means detecting a closing condition of the valve (2).