What is the flow rate of a TEV used in R410A systems compared to R22 systems?

In R410A systems, the thermal expansion valve (TEV) typically exhibits a flow rate that is approximately 15% greater than that of the same TEV rated for R22 systems. This increase is due to several factors, including the properties of the refrigerants themselves. R410A operates at higher pressures and has a higher capacity than R22, requiring a larger flow rate through the TEV to effectively manage the refrigerant expansion and to ensure sufficient cooling performance.

The physical characteristics of R410A, such as its density and heat transfer properties, necessitate this adjustment in flow rate. Moreover, the TEV’s design for R410A includes considerations for ensuring optimal system performance and efficiency under the higher pressure conditions presented by this refrigerant. Adjustments in valve sizing and characteristics are integral for achieving proper superheat management and system reliability.

In contrast, each of the other options reflects flow increments that are not aligned with the operational requirements and behavior of R410A compared to R22, leading to a less optimal system performance if those rates were implemented. Understanding these differences in flow rates helps technicians properly size and select components when retrofitting or servicing A/C systems.