Diagnostic for refrigerant composition verification
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Refrigeration systems face challenges in determining the correct refrigerant composition, especially with the transition from traditional A1 refrigerants to low Global Warming Potential (GWP) A2L refrigerants, which are often mildly flammable, and require accurate methods to ensure safe and efficient operation.
Innovation Solution
A method and system that measure the pressure and temperature (dewpoint and bubble point) of the refrigerant in a refrigeration system, comparing measured values to expected values to determine the correct refrigerant composition, with a controller selecting the appropriate heat exchanger based on ambient temperatures and operating a fan to facilitate accurate readings, and determining the correctness of the refrigerant composition within predefined error thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If refrigerant composition verification is performed continuously, then accuracy of refrigerant identification is improved, but system complexity increases
Solution Approach 1:
The system uses existing operational parameters (pressure and temperature readings already taken during normal operation) to calculate dewpoint and bubble point temperatures, thereby self- verifying refrigerant composition without requiring external specialized equipment. This approach achieves accurate refrigerant identification while minimizing additional system complexity by leveraging data already collected during system operation.
2Measurement precision
If multiple measurements are taken to verify refrigerant composition, then measurement precision is improved, but time consumption increases
Solution Approach 1:
The system performs refrigerant composition verification during the normal operation cycle by utilizing pressure and temperature measurements already taken for operational control. By integrating the verification process with existing operational measurements rather than performing separate dedicated verification steps, the system achieves accurate refrigerant identification without adding significant time consumption to the operational cycle.
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 approach allows for precise identification of correct refrigerant composition, distinguishing between correct and incorrect or contaminated refrigerants, ensuring safe and efficient operation of refrigeration systems by accurately determining the presence of low GWP refrigerants.
Implementation Method 1
measuring a pressure of refrigerant fluid in a refrigerant line of a heat exchanger
Implementation Method 2
measuring a value of at least one of a dewpoint temperature and a bubble point temperature of the refrigerant fluid
Implementation Method 3
measuring a pressure of refrigerant fluid in a refrigerant line of a heat exchanger
Implementation Method 4
a fan is operated, for a predefined time period, to pass air through the heat exchanger
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A method for a refrigeration system according to an example of the present disclosure includes measuring a pressure of fluid in a refrigerant line of a heat exchanger of a refrigeration system, and measuring a value of at least one of a dewpoint temperature and a bubble point temperature of the fluid at the measured temperature. The method also includes determining an expected value associated with said at least one of the dewpoint temperature and the bubble point temperature of the fluid at the measured pressure, and determining whether the fluid includes a correct refrigerant composition based on a comparison of the measured and expected values. A refrigeration system operable to determine whether a fluid includes a correct refrigerant composition is also disclosed.