A 0.6-m diameter gas pipeline is being used for the long-distance transport of natural gas. Just past a pumping station, the gas is found to be at a temperature of 25°Cand a pressure of 3.0 MPa. The mass flow rate is 125 kg/s, and the gas flow is adiabatic. Forty miles down the pipeline is another pumping station. At this point the pressure is found to be 2.0 MPa.
At the pumping station the gas is first adiabatically compressed to a pressure of 3.0 MPa, and then isobaric ally (i.e., at constant pressure) cooled to 25°C.
a) Find the temperature and velocity of the gas just before entering the pumping station.
b) Find the rate at which the gas compressor in the pumping station does work on the gas, the gas temperature leaving the compressor, and the heat load on the gas cooler.
You may assume that the compressor exhaust is also a 0.6-m pipe.