Air Conditioning Repair Certification (ETI) 2025 – 400 Free Practice Questions to Pass the Exam

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How does the flow rate of TEV in R410A systems compare to that in R22 systems?

It is higher in R22 systems

It is 15% lower in R410A systems

In R410A systems, the thermal expansion valve (TEV) flow rate is indeed different from that in R22 systems, primarily due to the properties of the refrigerants. R410A operates at a higher pressure compared to R22, which affects the flow characteristics within the system.

The correct answer indicates that the flow rate in R410A systems is about 15% lower than in R22 systems. This is largely because R410A is designed with a different thermal dynamic behavior, requiring a lesser mass flow rate to achieve the desired cooling capacity. The lower flow rate in R410A is advantageous as it can help optimize efficiency and maintain the proper refrigeration cycle under its different operational pressures.

This understanding is essential for technicians since it influences component selection and system design, making efficiency and performance expectations significantly different between systems utilizing these two refrigerants.

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It remains the same for both systems

It is lower in R22 systems

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