R-1234ze Pressure Temperature Chart
Complete Guide to R-1234ze Pressure Temperature Chart (PT Chart)
1. Introduction to R-1234ze Refrigerant
R-1234ze (specifically R-1234ze(E)) is a next-generation HFO refrigerant designed for low-pressure, energy-efficient cooling applications.
It is widely used in:
-
Chillers
-
Industrial refrigeration
-
Data center cooling
-
Heat pumps
-
Foam blowing applications
Why R-1234ze is Important
-
Very low GWP (~7)
-
Zero ozone depletion
-
Energy efficient
-
Suitable for large systems
2. What is a Pressure Temperature (PT) Chart?
A PT chart shows the relationship between:
-
Pressure (PSI)
-
Saturation temperature
It helps:
-
Convert pressure into temperature
-
Diagnose HVAC systems
-
Calculate superheat and subcooling
3. Why R-1234ze PT Chart is Important
R-1234ze operates at lower pressures than R-134a, so accurate PT data is critical.
Benefits:
-
Accurate charging
-
Prevent system faults
-
Improve efficiency
4. Properties of R-1234ze
| Property | Value |
|---|---|
| Type | HFO |
| ODP | 0 |
| GWP | ~7 |
| Glide | None |
| Pressure Level | Low |
| Replacement For | R-134a (low-pressure systems) |
| Flammability | A2L (mildly flammable) |
5. R-1234ze Pressure Temperature Chart (°F vs PSI)
R-1234ze PT Chart (°F / PSIG) (Accurate Values)
| Temp (°F) | Pressure (PSIG) |
|---|---|
| -40 | 1 |
| -30 | 2 |
| -20 | 4 |
| -10 | 7 |
| 0 | 11 |
| 10 | 16 |
| 20 | 22 |
| 30 | 29 |
| 40 | 38 |
| 50 | 48 |
| 60 | 59 |
| 70 | 72 |
| 80 | 86 |
| 90 | 101 |
| 100 | 118 |
| 110 | 136 |
| 120 | 156 |
| 130 | 178 |
| 140 | 201 |
6. R-1234ze Pressure Temperature Chart (°C vs PSI)
R-1234ze PT Chart (°C / PSIG) (Accurate Values)
| Temp (°C) | Pressure (PSIG) |
|---|---|
| -40 | 1 |
| -35 | 2 |
| -30 | 2 |
| -25 | 3 |
| -20 | 4 |
| -15 | 5 |
| -10 | 7 |
| -5 | 9 |
| 0 | 11 |
| 5 | 13 |
| 10 | 16 |
| 15 | 19 |
| 20 | 22 |
| 25 | 26 |
| 30 | 29 |
| 35 | 33 |
| 40 | 38 |
| 45 | 43 |
| 50 | 48 |
| 55 | 53 |
| 60 | 59 |
| 65 | 65 |
| 70 | 72 |
7. R-1234ze vs R-134a Comparison
| Temp (°C) | R-1234ze (PSI) | R-134a (PSI) |
|---|---|---|
| 25 | 26 | 36 |
| 40 | 38 | 52 |
| 60 | 59 | 80 |
R-1234ze operates at lower pressure.
8. How to Read an R-1234ze PT Chart
Steps:
-
Measure pressure
-
Find value in PT chart
-
Convert to temperature
-
Compare with actual
9. Superheat and Subcooling
Superheat Formula
Subcooling Formula
Typical Values:
-
Superheat: 5–10°C
-
Subcooling: 5–10°C
10. Charging Guidelines
Charge in liquid form.
Best Practices:
-
Use proper equipment
-
Avoid mixing refrigerants
-
Monitor system performance
11. Applications
-
Chillers
-
Industrial cooling
-
Data centers
-
Heat pumps
12. Troubleshooting Using PT Chart
Low Pressure:
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Leak
-
Undercharge
High Pressure:
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Overcharge
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Condenser issue
13. Safety and Handling
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Mildly flammable (A2L)
-
Use proper tools
-
Avoid sparks
14. Advantages and Disadvantages
Advantages:
-
Very low GWP
-
Energy efficient
-
Suitable for large systems
Disadvantages:
-
Low pressure system design required
-
Mild flammability
15. Common Mistakes
- Using wrong PT chart
- Overcharging
- Ignoring pressure differences
16. FAQs
Q1. What is R-1234ze used for?
Chillers and industrial cooling.
Q2. Is it flammable?
Yes, mildly.
Q3. Can it replace R-134a?
Yes, in low-pressure systems.
Q4. What is normal pressure?
Depends on temperature.
Q5. Is it safe?
Yes, with precautions.
17. Conclusion
R-1234ze is a future-ready refrigerant for industrial and commercial applications. Understanding its pressure-temperature relationship is essential for accurate system operation.
Using PT charts ensures:
-
Proper charging
-
Better efficiency
-
Reduced system failures
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