. Consider a natural gas with a molar composition of 92% methane, 5% ethane and 3% propane. An intercooled compressor in the pumping station for CNG compresses the gas from 1 bar and 300K to a pressure of 300 bar, 320K. The heat removed by the intercooler is 875 kW when the flow rate of natural gas is 0.4 kg/s. Compute the power input required to run the compressor, if the heat losses other than that removed by the intercooler can be neglected. Also compute the rate of exergy destruction in the intercooled compressor. Use the following data for the gases, and use Kay's rule for the natural gas at the high pressure. Use the chart for enthalpy correction. Molecular Weight Critical Temperature (K) Critical Pressure (bar) Methane 16.043 191.1 46.4 Ethane 30.07 305.5 44.8 Propane 44 370.0 42.6

. Consider a natural gas with a molar composition of 92% methane, 5% ethane and 3% propane. An intercooled compressor in the pumping station for CNG compresses the gas from 1 bar and 300K to a pressure of 300 bar, 320K. The heat removed by the intercooler is 875 kW when the flow rate of natural gas is 0.4 kg/s. Compute the power input required to run the compressor, if the heat losses other than that removed by the intercooler can be neglected. Also compute the rate of exergy destruction in the intercooled compressor. Use the following data for the gases, and use Kay's rule for the natural gas at the high pressure. Use the chart for enthalpy correction. Molecular Weight Critical Temperature (K) Critical Pressure (bar) Methane 16.043 191.1 46.4 Ethane 30.07 305.5 44.8 Propane 44 370.0 42.6