The Pressure / Temperature Chart

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Presentation transcript:

The Pressure / Temperature Chart

R-134a

Pressure / Temperature Chart The PT Chart is a TOOL, it will help you determine the Saturation Temperature of the refrigerant in your system. Once you know the saturation temperature, you are then able to determine the state of the refrigerant in your system!

Pressure / Temperature Chart Example: What is the Saturation Temperature of the refrigerant on the High Side of a system if the Discharge Pressure is 11.46 Bar, (166.10 PSIG)?

47.8º C (118° F) is the Saturation Temperature Degrees F Degrees C PSIG BARS -40 -40.0 14.50 1.00 56 13.3 52.30 3.61 -38 -38.9 13.70 0.95 58 14.4 55.00 3.80 -36 -37.8 12.80 0.88 60 15.6 57.50 3.97 -34 -36.7 11.80 0.81 62 16.7 60.10 4.15 -32 -35.6 10.80 0.75 64 17.8 62.70 4.33 -30 -34.4 9.70 0.67 66 18.9 65.50 4.52 -28 -33.3 8.60 0.59 68 20.0 68.30 4.71 -26 -32.2 7.70 0.53 70 21.1 71.20 4.91 -24 -31.1 6.20 0.43 72 22.2 74.20 5.12 -22 -30.0 4.90 0.34 74 23.3 77.20 5.33 -20 -28.9 3.60 0.25 76 24.4 80.30 5.54 -18 -27.8 2.30 0.16 78 25.6 83.50 5.76 -16 -26.7 0.80 0.06 80 26.7 86.80 5.99 -14 -25.6 0.30 0.02 82 27.8 90.20 6.22 -12 -24.4 1.10 0.08 84 28.9 93.60 6.46 -10 -23.3 1.90 0.13 86 30.0 97.10 6.70 -8 -22.2 2.80 0.19 88 31.1 100.70 6.95 -6 -21.1 90 32.2 104.40 7.20 -4 -20.0 4.50 0.31 92 33.3 108.20 7.47 -2 -18.9 5.50 0.38 94 34.4 112.10 7.73 -17.8 45.50 3.14 146 63.3 249.20 17.19 52 11.1 47.70 3.29 148 64.4 256.00 17.66 54 12.2 50.10 3.46 150 65.6 263.00 18.15 Underlined Values Indicate Vaccum (IN of HG, MM of Mercury) 6.50 0.45 96 35.6 116.10 8.01 2 -16.7 7.50 0.52 98 36.7 120.10 8.29 4 -15.6 8.50 0.59 100 37.8 124.30 8.58 6 -14.4 9.60 0.66 102 38.9 128.50 8.87 8 -13.3 10.80 0.75 104 40.0 132.90 9.17 10 -12.2 12.00 0.83 106 41.1 137.30 9.47 12 -11.1 13.10 0.90 108 42.2 142.80 9.85 14 -10.0 14.40 0.99 110 43.3 146.50 10.11 16 -8.9 15.70 1.08 112 44.4 151.30 10.44 18 -7.8 17.00 1.17 114 45.6 156.10 10.77 20 -6.7 18.40 1.27 116 46.7 161.10 11.12 22 -5.6 19.90 1.37 118 47.8 166.10 11.46 24 -4.4 21.40 1.48 120 48.9 171.30 11.82 26 -3.3 22.90 1.58 122 50.0 176.60 12.19 28 -2.2 24.50 1.69 124 51.1 182.00 12.56 30 -1.1 26.10 1.80 126 52.2 187.50 12.94 32 0.0 27.80 1.92 128 53.3 193.10 13.32 34 1.1 29.50 2.04 130 54.4 198.90 13.72 36 2.2 31.30 2.16 132 55.6 204.70 14.12 38 3.3 33.20 2.29 134 56.7 210.70 14.54 40 4.4 35.10 2.42 136 57.8 216.80 14.96 42 5.6 37.00 2.55 138 58.9 223.00 15.39 44 6.7 39.10 2.70 140 60.0 229.40 15.83 46 7.8 41.10 2.84 142 61.1 235.80 16.27 48 8.9 43.30 2.99 144 62.2 242.40 16.73 50 10.0 47.8º C (118° F) is the Saturation Temperature