Machinery's Handbook, 31st Edition
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Work REQUIRED TO COMPRESS AIR Table 35. Foot-pounds of Work Required in Compression of Air Initial Pressure = 1 atmosphere = 14.7 Pounds per Square Inch
Adiabatic Compression
Actual Compression Gage Pressure, lb/in 2
Adiabatic Compression
Actual Compression
Isothermal Compression
Isothermal Compression
Gage Pressure, lb/in 2
Foot-pounds Required per Cubic Foot of Air at Initial Pressure
Foot-pounds Required per Cubic Foot of Air at Initial Pressure
619.6 1098.2 1488.3 1817.7 2102.6 2353.6 2578.0 2780.8 2966.0 3136.2
649.5 1192.0 1661.2 2074.0 2451.6 2794.0 3111.0 3405.5 3681.7 3942.3
637.5 1154.6 1592.0 1971.4 2312.0 2617.8 2897.8 3155.6 3395.4 3619.8
3393.7 3440.4 3577.6 3706.3 3828.0 3942.9 4051.5 4155.7 4254.3 4348.1
4188.9 4422.8 4645.4 4859.6 5063.9 5259.7 5450.0 5633.1 5819.3 5981.2
3870.8 4029.8 4218.2 4398.1 4569.5 4732.9 4890.1 5042.1 5187.3
5
55 60 65 70 75 80 85 90
10 15 20 25 30 35 40 45
95 100
50 5327.9 Table 36. Horsepower Required to Compress Air, Single-Stage Compression Horsepower required to compress one cubic foot of free air per minute (isothermally and adiabatically) from atmospheric pressure (14.7 pounds per square inch) to various gage pressures. Single-Stage Compression, initial temperature of air, 60 ° F, jacket cooling not considered.
Isothermal Compression
Adiabatic Compression
Mean Effective Pressure, a Theoretical
Mean Eff. Pressure plus 15% Friction
Gage Pressure, Pounds
Absolute Pressure, Pounds
Number of Atmospheres
Horsepower plus 15% Friction
Mean Effective Pressure a Horsepower
Horsepower, Theoretical
19.7 24.7 29.7 34.7 39.7 44.7 49.7 54.7 59.7 64.7 69.7 74.7 79.7 84.7 89.7 94.7 99.7
1.34 1.68 2.02 2.36 2.70 3.04 3.38 3.72 4.06 4.40 4.74 5.08 5.42 5.76 6.10 6.44
4.13 7.57 11.02 12.62 14.68 16.30 17.90 19.28 20.65 21.80 22.95 23.90 24.80 25.70 26.62 27.52 28.21 28.93 29.60 30.30 31.42 32.60 33.75 34.67 35.59 36.30 37.20 38.10 38.80 39.50
0.018 0.033 0.048 0.055 0.064 0.071 0.078 0.084 0.090 0.095 0.100 0.104 0.108 0.112 0.116 0.120 0.123 0.126 0.129 0.132 0.137 0.142 0.147 0.151 0.155 0.158 0.162 0.166 0.169 0.172
4.46 8.21 11.46 14.30 16.94 19.32 21.50 25.53 25.40 27.23 28.90 30.53 32.10 33.57 35.00 36.36 37.63 38.89 40.11 41.28 43.56 45.69 47.72 49.64 51.47 53.70 55.60 57.20 58.80 60.40
5.12 9.44 13.17 16.44 19.47 22.21 24.72 27.05 29.21 31.31 33.23 35.10 36.91 38.59 40.25 41.80 43.27 44.71 46.12 47.46 50.09 52.53 54.87 57.08 59.18 61.80 64.00 65.80 67.70 69.50
0.019 0.036 0.050 0.062 0.074 0.084 0.094 0.103 0.111 0.119 0.126 0.133 0.140 0.146 0.153 0.159 0.164 0.169 0.175 0.180 0.190 0.199 0.208 0.216 0.224 0.234 0.242 0.249 0.256 0.263
0.022 0.041 0.057 0.071 0.085 0.096 0.108 0.118 0.127 0.136 0.145 0.153 0.161 0.168 0.175 0.182 0.189 0.195 0.201 0.207 0.218 0.229 0.239 0.249 0.258 0.269 0.278 0.286 0.294
5
10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85
6.78 7.12 7.46 7.80 8.48 9.16 9.84 10.52 11.20 11.88 12.56 13.24 13.92 14.60
90 104.7 95 109.7 100 114.7 110 124.7 120 134.7 130 144.7 140 154.7 150 164.7 160 174.7 170 184.7 180 194.7 190 204.7
200 214.7 0.303 a Mean Effective Pressure (MEP) is defined as that single pressure rise, above atmospheric, which would require the same horsepower as the actual varying pressures during compression.
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