A two-step, steady-state process is used to compress 100 kg/min of nitrogen from P = 1 bar

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A two-step, steady-state process is used to compress 100 kg/min of nitrogen from P = 1 bar and T = 250 K to P = 10 bar and T = 250 K. First, an adiabatic compressor is used to convert the nitrogen from P = 1 bar and T = 250 K to P = 10 bar and T = 300 K. Then a heat exchanger is used to cool the nitrogen to T= 250 K. Find the work added in the compressor, and the heat removed in the heat exchanger.

A. Use an ideal gas model.

B. Use Figure 2-3 as much as possible. If you need an equation of state, use the van der Waals equation, with a = 1.37 × 106 bar · cm6/mol2 and b = 38.6 cm3/mol.THERMODYNAMIC PROPERTIES OF NITROGEN 0 250 A, kJ/kg FIGURE 2-3 Thermodynamic diagram for nitrogen. 50 100 000

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