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

In R410A systems, the flow rate through the thermal expansion valve (TEV) is approximately 15% greater than that of R22 systems. This is primarily due to the difference in the refrigerant properties and performance characteristics between R410A and R22. R410A operates at a higher pressure and has a different molecular composition compared to R22, which means that it requires a higher flow rate to achieve the same cooling capacity.

The higher flow rate is necessary for maintaining the efficiency and effectiveness of the cooling process in R410A systems. This means that when designing or servicing a system that uses R410A, technicians must account for these differences to ensure proper performance and avoid issues such as insufficient cooling or system inefficiencies. The calibration of the TEV is vital for the system to operate optimally, making it crucial for HVAC professionals to understand these differences in flow rates.