An R-134a TEV system is operating with a suction pressure of 22 psig and a suction line temperature at the bulb of 50°F. What is the actual operating superheat?
What will be an ideal response?
The saturation temperature for R-134a at 22 psig is 25°F. The superheat is 50°F – 25°F = 25°F
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REFRIGERANT
TEMP _____________________ TEMP ______________________ TEMP ________________________ °F 12 22 134a 502 °F 12 22 134a 502 °F 12 22 134a 502 -60 19.0 12.0 7.2 12 15.8 34.7 13.2 43.2 42 38.8 71.4 37.0 83.8 -55 17.3 9.2 3.8 13 16.4 35.7 13.8 44.3 43 39.8 73.0 38.0 85.4 -50 15.4 6.2 0.2 14 17.1 36.7 14.4 45.4 44 40.7 74.5 39.0 87.0 -45 13.3 2.7 1.9 15 17.7 37.7 15.1 46.5 45 41.7 76.0 40.1 88.7 -40 11.0 0.5 14.7 4.1 16 18.4 38.7 15.7 47.7 46 42.6 77.6 41.1 90.4 -35 8.4 2.6 12.4 6.5 17 19.0 39.8 16.4 48.8 47 43.6 79.2 42.2 92.1 -30 5.5 4.9 9.7 9.2 18 19.7 40.8 17.1 50.0 48 44.6 80.8 43.3 93.9 -25 2.3 7.4 6.8 12.1 19 20.4 41.9 17.7 51.2 49 45.7 82.4 44.4 95.6 -20 0.6 10.1 3.6 15.3 20 21.0 43.0 18.4 52.4 50 46.7 84.0 45.5 97.4 -18 1.3 11.3 2.2 16.7 21 21.7 44.1 19.2 53.7 55 52.0 92.6 51.3 106.6 -16 2.0 12.5 0.7 18.1 22 22.4 45.3 19.9 54.9 60 57.7 101.6 57.3 116.4 -14 2.8 13.8 0.3 19.5 23 23.2 46.4 20.6 56.2 65 63.8 111.2 64.1 126.7 -12 3.6 15.1 1.2 21.0 24 23.9 47.6 21.4 57.5 70 70.2 121.4 71.2 137.6 -10 4.5 16.5 2.0 22.6 25 24.6 48.8 22.0 58.8 75 77.0 132.2 78.7 149.1 -8 5.4 17.9 2.8 24.2 26 25.4 49.9 22.9 60.1 80 84.2 143.6 86.8 161.2 -6 6.3 19.3 3.7 25.8 27 26.1 51.2 23.7 61.5 85 91.8 155.7 95.3 174.0 -4 7.2 20.8 4.6 27.5 28 26.9 52.4 24.5 62.8 90 99.8 168.4 104.4 187.4 -2 8.2 22.4 5.5 29.3 29 27.7 53.6 25.3 64.2 95 108.2 181.8 114.0 201.4 0 9.2 24.0 6.5 31.1 30 28.4 54.9 26.1 65.6 100 117.2 195.9 124.2 216.2 1 9.7 24.8 7.0 32.0 31 29.2 56.2 26.9 67.0 105 126.6 210.8 135.0 231.7 2 10.2 25.6 7.5 32.9 32 30.1 57.5 27.8 68.4 110 136.4 226.4 146.4 247.9 3 10.7 26.4 8.0 33.9 33 30.9 58.8 28.7 69.9 115 146.8 242.7 158.5 264.9 4 11.2 27.3 8.6 34.9 34 31.7 60.1 29.5 71.3 120 157.6 259.9 171.2 282.7 5 11.8 28.2 9.1 35.8 35 32.6 61.5 30.4 72.8 125 169.1 277.9 184.6 301.4 6 12.3 29.1 9.7 36.8 36 33.4 62.8 31.3 74.3 130 181.0 296.8 198.7 320.8 7 12.9 30.0 10.2 37.9 37 34.3 64.2 32.2 75.8 135 193.5 316.6 213.5 341.2 8 13.5 30.9 10.8 38.9 38 35.2 65.6 33.2 77.4 140 206.6 337.2 229.1 362.6 9 14.0 31.8 11.4 39.9 39 36.1 67.1 34.1 79.0 145 220.3 358.9 245.5 385.0 10 14.6 32.8 11.9 41.0 40 37.0 68.5 35.1 80.5 150 234.6 381.5 262.7 408.4 11 15.2 33.7 12.5 42.1 41 37.9 70.0 36.0 82.1 155 249.5 405.1 280.7 432.9 An R-22 cylinder containing enough refrigerant to have liquid refrigerant in it, is in a truck with a temperature of 120°F. What would be the psig pressure in the cylinder? A. 255.7 psig B. 259.9 psig C. 267.0 psig D. 271.5 psig
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