输气管道采用压气机加压,设进气的压力为0.1 MPa,温度为20 °C,而要求每分钟输出压力为0.3 MPa、温度不高于60 °C的气体80 m3,现有吸气量为每分钟8 m3的压气机,问需用多少 the air in pipe line is compressed by air compressors with intake pressure 20 °C and pressure 0.1 MPa,the outlet air of the pipe line is 0.3 MPa and temperature should lower than 60 °C, and the flow rate is 80m3/min, and the intake volume for each compressor is 8m3/min,to determine how many compressors should be equipped in the pipe line.