附录G压缩机轴功率计算

附录G压缩机轴功率计算 附录G 压缩机轴功率计算 G(O(1 离心式压缩机轴功率应按下列公式计算: G(,(2 往复式压缩机轴功率应按下式计算: For an ideal gas, the adiabatic head (H) required to compress a gas from P to P is: 12 (k-1)/kH = [k/(k-1)] [R T/9.806][(P/P) - 1] 121 where: H = adiabatic head, in meters k = c/c = specific heat of gas at constant pressure/ specific heat at constant pv volume T = inlet temperature, in ?K (degrees Kelvin) 1 R = (universal gas constant, in J/kgmol•?K)/MW = 8314/MW MW = molecular weight of gas (dimensionless) P = absolute inlet pressure, in kPa (kiloPascals) 1 P = absolute discharge pressure. in kPa 2 The theoretical power (P) required is: (k-1)/kP = (F H)/1000 = [k/(k-1)] [w R T/9806][(P/P) - 1] 121 where: P = theoretical power, in kW (kilowatts) which is same as (Nm/s)/1000 23F = (mass flow of gas, in kg/s)(9.806 m/s), in kg•m/s which is same as N/s N = Newtons m = meters s = seconds To obtain the actual power, simply divide the theoretical power by the compressor efficiency which you will have to obtain from the manufacturer. Please excuse my spelling the metric units ... this is done for those readers who (like myself) are struggling to get away from the USA customary units