Suppose a gas turbine is working on pure nitrogen. Nitrogen at 27^oC and 1 bar is compressed by two stage compressor. Final outlet pressure is recorded as 20 bar. First stage outlet pressure is 4 bar. Temperature of the nitrogen is raised to 1300 K in the heater (external combustion chamber) before expansion in the turbine to 1 bar. (Thermodynamic data is provided, use interpolation where required).

1. What should be the temperature of nitrogen before entering the turbine to achieve breakeven point of efficiency (efficiency = 0) of practical/irreversible cycle?