Flash Tank Liquid Level Measurement for Refrigerant Charge Evaluation
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Solution Overview
Problem
Existing methods for determining refrigerant charge in refrigeration circuits are laborious, time-consuming, and often inaccurate, posing safety risks and performance issues due to sub-optimal refrigerant levels.
Innovation Solution
A method that measures and compares the quantity of liquid refrigerant in a flash tank with an expected quantity based on ambient temperature, allowing for instantaneous evaluation of refrigerant charge without draining the circuit, using a liquid level sensor and processor to determine optimal or sub-optimal levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the refrigeration circuit is drained and refrigerant is removed for measurement, then the refrigerant charge quantity can be determined, but the refrigeration circuit must be shut down and the process is time-consuming
Solution Approach 1:
The invention extracts only the necessary measurement function to the flash tank, where liquid refrigerant accumulates. By measuring the liquid level in this isolated component rather than draining the entire circuit, the system maintains operational status while obtaining accurate charge determination data.
Solution Approach 2:
The flash tank serves as an intermediary component that concentrates liquid refrigerant from the entire circuit into a single measurable location. The liquid level sensor in the flash tank indirectly measures the total refrigerant charge without requiring direct measurement of the entire circuit, enabling continuous monitoring during operation.
2Device complexity
If a sight glass is used to estimate refrigerant level, then the device complexity is reduced, but the measurement precision is insufficient and cannot detect overcharge
Solution Approach 1:
The invention replaces the subjective visual estimation method of sight glasses with an objective electronic liquid level sensor. This substitution provides precise quantitative measurement of liquid refrigerant levels, enabling accurate determination of both undercharge and overcharge conditions through electrical signals rather than human interpretation.
3Measurement precision
If the refrigeration circuit is drained for refrigerant measurement, then the refrigerant charge can be accurately determined, but the productivity is reduced due to circuit shutdown
Solution Approach 1:
The flash tank continuously accumulates liquid refrigerant during normal operation, preparing the measurement sample in advance. When charge evaluation is needed, the liquid level sensor can immediately measure the pre-concentrated liquid refrigerant in the flash tank without requiring circuit shutdown, enabling on-demand assessment during productive 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
Enables precise, on-demand assessment of refrigerant charge, reducing downtime and safety risks by providing real-time monitoring and detection of leaks, ensuring optimal performance and preventing damage.
Implementation Method 1
measuring a quantity of liquid refrigerant within a flash tank of the refrigeration circuit
Data Source
AI summary
A method of evaluating refrigerant charge within a refrigeration circuit. The method includes measuring a quantity of liquid refrigerant within a flash tank of the refrigeration circuit; determining an expected quantity of liquid refrigerant within the flash tank; comparing the expected quantity with the measured quantity of liquid refrigerant within the flash tank; and evaluating the refrigerant charge within the refrigeration circuit based on the comparison.