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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.
Gage Pressure, Pounds | Absolute Pressure, Pounds | Number of Atm. | Correct Ratio of Cylinder Volumes | Intercooler Gage Pressure | Isothermal Compression | Adiabatic Compression | Percentage of Saving over One-stage Compression | ||||
Mean Effective Pressure * | HP |
Mean Eff. Pressure, * Theoretical | Mean Eff. Pressure plus 15%t Friction | Horsepower, Theoretical |
HP plus 15% Friction | ||||||
50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 350 400 450 500 | 64.7 74.7 84.7 94.7 104.7 114.7 124.7 134.7 144.7 154.7 164.7 174.7 184.7 194.7 204.7 214.7 224.7 234.7 244.7 254.7 264.7 274.7 284.7 294.7 304.7 314.7 364.7 414.7 464.7 514.7 | 4.40 5.08 5.76 6.44 7.12 7.80 8.48 9.16 9.84 10.52 11.20 11.88 12.56 13.24 13.92 14.60 15.28 15.96 16.64 17.32 18.00 18.68 19.36 20.04 20.72 21.40 24.80 28.20 31.60 35.01 | 2.10 2.25 2.40 2.54 2.67 2.79 2.91 3.03 3.14 3.24 3.35 3.45 3.54 3.64 3.73 3.82 3.91 3.99 4.08 4.17 4.24 4.32 4.40 4.48 4.55 4.63 4.98 5.31 5.61 5.91 | 16.2 18.4 20.6 22.7 24.5 26.3 28.1 29.8 31.5 32.9 34.5 36.1 37.3 38.8 40.1 41.4 42.8 44.0 45.3 46.6 47.6 48.8 50.0 51.1 52.2 53.4 58.5 63.3 67.8 72.1 | 21.80 23.90 25.70 27.52 28.93 30.30 31.42 32.60 33.75 34.67 35.59 36.30 37.20 38.10 38.80 39.50 40.10 40.70 41.30 41.90 42.70 43.00 43.50 44.00 44.50 45.80 47.30 49.20 51.20 52.70 | 0.095 0.104 0.112 0.120 0.126 0.132 0.137 0.142 0.147 0.151 0.155 0.158 0.162 0.166 0.169 0.172 0.174 0.177 0.180 0.183 0.186 0.188 0.190 0.192 0.194 0.197 0.206 0.214 0.223 0.229 | 24.30 27.20 29.31 31.44 33.37 35.20 36.82 38.44 39.86 41.28 42.60 43.82 44.93 46.05 47.16 48.18 49.35 50.30 51.30 52.25 52.84 53.85 54.60 55.50 56.20 56.70 60.15 63.19 65.93 68.46 | 27.90 31.30 33.71 36.15 38.36 40.48 42.34 44.20 45.83 47.47 48.99 50.39 51.66 52.95 54.22 55.39 56.70 57.70 59.10 60.10 60.76 62.05 62.90 63.85 64.75 65.20 69.16 72.65 75.81 78.72 | 0.106 0.118 0.128 0.137 0.145 0.153 0.161 0.168 0.174 0.180 0.186 0.191 0.196 0.201 0.206 0.210 0.216 0.220 0.224 0.228 0.230 0.235 0.238 0.242 0.246 0.247 0.262 0.276 0.287 0.298 | 0.123 0.136 0.147 0.158 0.167 0.176 0.185 0.193 0.200 0.207 0.214 0.219 0.225 0.231 0.236 0.241 0.247 0.252 0.257 0.262 0.264 0.270 0.274 0.278 0.282 0.283 0.301 0.317 0.329 0.342 | 10.9 11.3 12.3 13.8 14.2 15.0 15.2 15.6 16.3 16.7 16.9 18.4 19.0 19.3 19.5 20.1 - - - - - - - - - - - - - - |
* 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.