Figure 1 shows a regenerative gas turbine power plant. Air enters the compressor with a mass flow rate of 1 bar, 27°C and 0.562 kg/s and is compressed to 4 bar. The isentropic efficiency of the compressor is 80% and the regenerator efficiency is 90%. All the power generated from the high pressure turbine is used to run the compressor. The low pressure turbine provides net power output. The isentropic efficiency of each turbine is 87% and the temperature at the inlet of the high pressure turbine is 1200 K. a) Net power output (kW) ? b) thermal efficiency ? c) Calculate the temperature (K) of the air at states 2, 3, 5, 6 and 7. find it

Thermodynamics 2. Determine the useful power produced in a thermally insulated turbine from 30 bar and 360Ç to 0.5 bar and 90% quality. The water flow is 15000kg/h

C. In an ideal gas turbine power device, the pressure ratio is 6, the temperature entering the compressor is 27°C, and the maximum allowable temperature of the turbine is 816°C. What is the efficiency of this power device when it is carried out in reversible operation? However, the specific ratio is 1.4. (a)20% (b)30% (c)40% (d)50%

In a Diesel cycle, the air at the beginning of the isentropic compression is at 1 bar and the volume is 0.85 L. The displaced volume of the cycle is 0.78 L, the temperature at the end of the compression process is 690 K, the pressure at the end of the expansion process is 2.32 bar, the specific heat ratio is =1.32, the specific heat at constant volume Cv = 0.75 kJ/kg.K and the gas constant is 287 J/kg.K for air. The compression ratio is: Choose. The specific heat at constant pressure in kJ/kg.K is: Choose. The maximum temperature of the cycle in K is: Choose. The temperature at the end of the expansion process of the cycle in K is: Choose.. the heat rejected in kJ/kg of air is: Choose.

Air enters the compressor of a Brayton refrigeration cycle at 100 kPa, 260 K, and is compressed adiabatically to 300 kPa. Air enters the turbine at 300 kPa, 300 K, and expands adiabatically to 100 kPa. For the cycle, assuming the compressor and turbine isentropic efficiencies are both 100%, determine: (a) The net work per unit mass of air flow [15 kJ/kg] (b) The coefficient of performance [2.7]