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．０．2 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 P1 to P2 is:
H = [k/(k-1)] [R T1/9.806][(P2/P1)(k-1)/k - 1]
where:
H = adiabatic head, in meters
k = cp/cv = specific heat of gas at constant pressure/ specific heat at constant volume
T1 = inlet temperature, in °K (degrees Kelvin)
R = (universal gas constant, in J/kgmol•°K)/MW = 8314/MW
MW = molecular weight of gas (dimensionless)
P1 = absolute inlet pressure, in kPa (kiloPascals)
P2 = absolute discharge pressure. in kPa
The theoretical power (P) required is:
P = (F H)/1000 = [k/(k-1)] [w R T1/9806][(P2/P1)(k-1)/k - 1]
where:
P = theoretical power, in kW (kilowatts) which is same as (Nm/s)/1000
F = (mass flow of gas, in kg/s)(9.806 m/s2), in kg•m/s3 which is same as N/s
N = Newtons
m = meters
s = conds
To obtain the actual power, simply divide the theoretical power by the compressor efficiency which you will have to obtain from the manufacturer.
Plea excu my spelling the metric units ... this is done for tho readers who (like mylf) are struggling to get away from the USA customary units
