Pressure-Temperature Relationship
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A refrigerant, when confined in an enclosed space, increases in pressure as the temperature increases. Conversely, if the temperature is lowered, the pressure also decreases.
Depending on temperature, a corresponding pressure will exist in such an enclosed space. For example, at 70°F (21.1°C) a gauge will indicate about 71.0 psi (5.0 kg/cm2 ). The R-134a PRESSURE-TEMPERATURE RELATIONSHIP table shows this relationship.
R-134a PRESSURE-TEMPERATURE RELATIONSHIP
| Temperature °F (°C) | (1) psi (kg/cm2 ) | ||
|---|---|---|---|
| 20 (-6.7) | 18 (1.3) | ||
| 30 (-1.1) | 26 (1.8) | ||
| 40 (4.4) | 35 (2.5) | ||
| 45 (7.2) | 40 (2.8) | ||
| 50 (10.0) | 45 (3.2) | ||
| 55 (12.8) | 51 (3.6) | ||
| 60 (15.6) | 57 (4.0) | ||
| 65 (18.3) | 64 (4.5) | ||
| 70 (21.1) | 71 (5.0) | ||
| 75 (23.9) | 79 (5.6) | ||
| 80 (26.7) | 87 (6.1) | ||
| 85 (29.4) | 95 (6.7) | ||
| 90 (32.2) | 104 (7.3) | ||
| 95 (35.0) | 114 (8.0) | ||
| 100 (37.8) | 124 (8.7) | ||
| 110 (43.3) | 147 (10.3) | ||
| 120 (48.9) | 171 (12.0) | ||
| 130 (54.4) | 199 (14.0) | ||
| 140 (60.0) | 229 (16.1) | ||
| 150 (65.6) | 263 (18.5) | ||
| 160 (71.1) | 300 (21.1) | ||
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