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A regenerative gas turbine power plant isshown in Fig. P1. Air enters the compressor at 1bar, 27ºC with a mass flow rate of 0.562 kg/s andis compressed to 4 bar. The isentropic efficiency ofthe compressor is 80%, and the regeneratoreffectiveness is 90%. All the power developed bythe high-pressure turbine is used to run thecompressor. The low-pressure turbine provides thenet power output. Each turbine has an isentropicefficiency of 87% and the temperature at the inletto the high-pressure turbine is 1200 K. Sketch thecorresponding T – s diagram and determine: (a) The net power output, in kW. (b) The thermalefficiency. (c) The temperature of the air at states2, 3, 5, 6, and 7, in K.
An ideal Otto cycle has a compression ratio of 10.5, takes in air at 90 kPa and , and is repeated 2500 times per minute. Using constant specific heats at room temperature, determine the thermal efficiency of this cycle and the rate of heat input if the cycle is to produce 90 kW of power.
In thermal electric generating plant, overall efficiency is improved when
a. Boiler pressure is increased
b. The difference between initial pressure and temperature and exhaust pressure and temperature are held at a maximum
c. Load on the units is increased
d. Increased the no. of generator