In an air-standard Brayton cycle air enters the compressor at 0.5 MPa and 15 °C and leaves at 1.5 MPa; maximum temperature 1000 °C; compressor efficiency 85 %; γ = 1.4, c_{p} = 1.004, c_{v} = 0.717 kJ/kg·K. Find the compressor work. (answer in kJ/kg)