Question

In a reheat cycle the initial steam pressure and the maximum temperature are 150 bar and 550 C respectively If the condenser pressure is 0.1 bar and the moisture at the condenser

Answer 1

Explanation:

Steam at 40 bar, 500oC flowing at rate of 5500 kg/h expands in a H.P. turbine to 2 bar with anisentropic efficiency of 83%. A continuous supply of steam at 2 bar, 0.87 quality and a flow rate2700 kg/h is available from a geothermal energy source. This steam is mixed adiabatically withthe H.P. turbine exhaust steam and the combined flow then expands in a L.P. turbine to 0.1 barwith an isentropic efficiency of 78%. Determine the power output and the thermal efficiency ofthe plant. Assume that 5500 kg/h of steam is generated in the boiler at 40 bar, 500oC from thesaturated feedwater at 0.1 bar.

Answer 2

Answer:

In a reheat cycle the initial steam pressure and maximum temperature are 150bar and 550°C respectively.

If the condenser pressure is 0.1 bar and the moisture at the condenser inlet is 5% and assuming ideal

processes, determine

(i) The reheat pressure

(ii) The cycle efficiency

(iii) The steam rate