Regeneration, Reheat, and Compression with Intercooling The cycle of Problem 9.59...

Regeneration, Reheat, and Compression with Intercooling

The cycle of Problem 9.59 is modified to include the effects of irreversibilities in the adiabatic expansion and compression process. The regenerator effectiveness is 100%. If the states at the compressor and turbine inlets remain unchanged, the cycle produces 10 MW of power, and the compressor and turbine isentropic efficiencies are both 80%, determine

(a) the pressure, in kPa, temperature, in K, and enthalpy, in kJ/kg, at each principal state of the cycle and sketch the T–s diagram.

(b) the mass flow rate of air, in kg/s.

(c) the rate of heat transfer, in kW, to the working fluid passing through the combustor.

(d) the thermal efficiency.

9.59 An ideal air-standard regenerative Brayton cycle produces 10 MW of power. Operating data at principal states in the cycle are given in the table below. The states are numbered as in Fig. 9.14. Sketch the T–s diagram and determine

(a) the mass flow rate of air, in kg/s.

(b) the rate of heat transfer, in kW, to the working fluid passing through the combustor.

(c) the thermal efficiency.