R-407C Refrigerant Sizing: Saturated Pressure Charts and Glide Adjustments
Advanced technical manual for R-407C refrigerant operations, focusing on calculating bubble/dew thresholds and adjusting for temperature glide.
Managing High Temperature Glide Blends
R-407C is a widely used zeotropic HFC blend operating as a premier retrofitting option for old R-22 commercial air conditioning systems and industrial process fluid chillers.
In this engineering brief, we examine R-407C Pressure Sheets and Temperature Glide Tuning. Prime Cool manages chemical transitions safely across heavy production units in Pune.
Chemical Split Architecture
- Composition Ratios: R-32 / R-125 / R-134a (23% / 25% / 52% total mass split)
- The Glide Phenomenon: Unlike pure gases, R-407C has a significant temperature glide of approximately 4.4°C. The individual gases evaporate and condense at different temperatures.
- GWP Metric Value: 1,774
Quick-Reference R-407C P-T Chart (Bubble vs Dew Values)
| Temperature (°C) | Bubble Pressure (Liquid Line - bar) | Dew Pressure (Suction Line - bar) |
|---|---|---|
| 0°C | 4.63 bar | 3.63 bar |
| 5°C | 5.48 bar | 4.35 bar |
| 10°C | 6.44 bar | 5.17 bar |
| 15°C | 7.51 bar | 6.10 bar |
| 45°C (Condenser Line) | 17.61 bar | 15.01 bar |
Superheat Calculation Rule
When calculating superheat for an R-407C system, technicians must always reference the Dew Pressure value on their PT chart. Conversely, when calculating subcooling, reference the Bubble Pressure metric to ensure accurate diagnostics.
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