Machinery's Handbook, 31st Edition
Work REQUIRED TO COMPRESS AIR 2817 Table 37. Horsepower Required to Compress Air, Two-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. Two-Stage Compression, initial temperature of air, 60 ° F, jacket cooling not considered. Isothermal Compression Adiabatic Compression 50 64.7 4.40 2.10 16.2 21.80 0.095 24.30 27.90 0.106 0.123 10.9 60 74.7 5.08 2.25 18.4 23.90 0.104 27.20 31.30 0.118 0.136 11.3 70 84.7 5.76 2.40 20.6 25.70 0.112 29.31 33.71 0.128 0.147 12.3 80 94.7 6.44 2.54 22.7 27.52 0.120 31.44 36.15 0.137 0.158 13.8 90 104.7 7.12 2.67 24.5 28.93 0.126 33.37 38.36 0.145 0.167 14.2 100 114.7 7.80 2.79 26.3 30.30 0.132 35.20 40.48 0.153 0.176 15.0 110 124.7 8.48 2.91 28.1 31.42 0.137 36.82 42.34 0.161 0.185 15.2 120 134.7 9.16 3.03 29.8 32.60 0.142 38.44 44.20 0.168 0.193 15.6 130 144.7 9.84 3.14 31.5 33.75 0.147 39.86 45.83 0.174 0.200 16.3 140 154.7 10.52 3.24 32.9 34.67 0.151 41.28 47.47 0.180 0.207 16.7 150 164.7 11.20 3.35 34.5 35.59 0.155 42.60 48.99 0.186 0.214 16.9 160 174.7 11.88 3.45 36.1 36.30 0.158 43.82 50.39 0.191 0.219 18.4 170 184.7 12.56 3.54 37.3 37.20 0.162 44.93 51.66 0.196 0.225 19.0 180 194.7 13.24 3.64 38.8 38.10 0.166 46.05 52.95 0.201 0.231 19.3 190 204.7 13.92 3.73 40.1 38.80 0.169 47.16 54.22 0.206 0.236 19.5 200 214.7 14.60 3.82 41.4 39.50 0.172 48.18 55.39 0.210 0.241 20.1 210 224.7 15.28 3.91 42.8 40.10 0.174 49.35 56.70 0.216 0.247 … 220 234.7 15.96 3.99 44.0 40.70 0.177 50.30 57.70 0.220 0.252 … 230 244.7 16.64 4.08 45.3 41.30 0.180 51.30 59.10 0.224 0.257 … 240 254.7 17.32 4.17 46.6 41.90 0.183 52.25 60.10 0.228 0.262 … 250 264.7 18.00 4.24 47.6 42.70 0.186 52.84 60.76 0.230 0.264 … 260 274.7 18.68 4.32 48.8 43.00 0.188 53.85 62.05 0.235 0.270 … 270 284.7 19.36 4.40 50.0 43.50 0.190 54.60 62.90 0.238 0.274 … 280 294.7 20.04 4.48 51.1 44.00 0.192 55.50 63.85 0.242 0.278 … 290 304.7 20.72 4.55 52.2 44.50 0.194 56.20 64.75 0.246 0.282 … 300 314.7 21.40 4.63 53.4 45.80 0.197 56.70 65.20 0.247 0.283 … 350 364.7 24.80 4.98 58.5 47.30 0.206 60.15 69.16 0.262 0.301 … 400 414.7 28.20 5.31 63.3 49.20 0.214 63.19 72.65 0.276 0.317 … 450 464.7 31.60 5.61 67.8 51.20 0.223 65.93 75.81 0.287 0.329 … 500 514.7 35.01 5.91 72.1 52.70 0.229 68.46 78.72 0.298 0.342 … 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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