Heat Exchanger Flow Monitoring via Parallel Path Temperature Ratios
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Solution Overview
Problem
Heat exchangers with parallel flow paths face issues with inadequate flow due to clogging from calcification or dirt deposits, leading to insufficient heat dissipation and cavitation, which existing systems fail to detect since flow occurs through other paths.
Innovation Solution
Monitoring the temperature in parallel flow paths and a collecting line to calculate the proportion of flow through each channel, defining a target range for the flow ratio and issuing warnings or switching off the device if the ratio falls outside this range to prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If parallel flow paths are used to increase heat transfer surface, then heat transfer efficiency is improved, but flow distribution becomes difficult to monitor and control
Solution Approach 1:
The patent implements a feedback mechanism by continuously measuring temperatures at multiple points (inlet, outlet, and intermediate points) and using these measurements to calculate flow distribution ratios. The system compares calculated flow ratios against target ranges and provides feedback control to maintain proper flow distribution, thereby monitoring flow in parallel paths without requiring complex direct flow measurement devices in each path.
2Measurement precision
If flow paths are monitored individually to detect clogging, then detection accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent uses temperature as an intermediary parameter to indirectly measure flow distribution. Instead of installing flow sensors in each parallel path, the system measures temperatures at accessible points and uses these temperature readings to calculate flow ratios. This intermediary approach enables accurate clogging detection while avoiding the complexity of direct flow measurement in each path.
Solution Approach 2:
The patent replaces mechanical flow measurement systems (flow sensors, meters) with a thermal-based measurement system. By substituting mechanical flow detection with temperature measurement and calculation, the system achieves equivalent monitoring capability with simpler, more reliable temperature sensors that can be easily installed at heat exchanger ports.
3Device complexity
If flow ratio changes are ignored to maintain system simplicity, then device simplicity is preserved, but reliability decreases due to undetected clogging
Solution Approach 1:
The system continuously monitors flow distribution through temperature measurements and provides feedback when flow ratios deviate from target ranges. This feedback mechanism enables the system to detect clogging conditions and alert operators or automatically adjust operations, maintaining reliability without requiring complex additional hardware beyond the temperature sensors already needed for heat exchanger operation.
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
Effectively detects changes in flow ratios, preventing overheating and damage by ensuring the heat exchanger operates within a safe range, even in the presence of manufacturing tolerances or contamination, and can be applied to various heat exchanger configurations.
Implementation Method 1
the temperature in the parallel flow paths and in the collecting line is recorded
Implementation Method 2
In heat exchangers, heat is transferred from one medium to another
Implementation Method 3
a fluid flows through the return line into the two parallel fluid paths where it is each heated by a heat source
Implementation Method 4
The temperature difference ΔT results from the difference between the return temperature, which prevails in the return line, and the temperature, which is measured by the temperature sensor
Data Source
AI summary
Method for monitoring the flow of a heat exchanger (1), preferably a heating system, with at least 2 fluid paths (2, 3) through which the fluid flows in parallel and and a collecting line (4) into which the at least 2 fluid paths (2, 3) through which the fluid flows in parallel open, wherein in the collecting line (4) and in each of the parallel fluid paths (2, 3) there is a temperature sensor (5, 6, 7) and the proportion of the flow through at least a fluid path (2, 3) is calculated.