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390 9.9 The exhaust of a 2-MW gas turbine operating at 960°C turbine inlet temp- erature with a compressor pressure ratio of 9 transfers heat without loss to operate an absorption chiller with a COP of 0.83. The exhaust gas leaves the chiller at a temperature of 120°C. The compressor inlet conditions are 105 kPa and 25°C, and the compressor and turbine isentropic efficiencies are 82% and 86%, respectively. How many tons of refrigeration can be produced by the chiller? 9.10*Develop a spreadsheet like that in Table 9.1, and investigate the influence on the combined-cycle efficiency of varyingeach of the following: (a) HRSG exit temperature. (b) Steam turbine throttle temperature. (c) Gas turbine inlet temperature. (d) Compressor pressure ratio. 9.11 A closed-cycle gas turbine using air as a working fluid has an intercooler, a reheater, and a recuperator. The overall pressure ratio is 6. The low-pressure compressor has a pressure ratio of 2. Both compressors are driven by the high-pressure turbine. All turbomachines are 85% efficient. Compressor inlet temperatures are 80°F, and turbine inlet temperatures are 1500°F. Regenerator effectiveness is 75%. (a) Draw T-s and flow diagrams, and label both compatibly. (b) Identify actual temperatures, in degrees Rankine, at all stations of sig- nificance. (c) If the low-pressure compressor inlet pressure is 6 atm, what are the intercooler and reheater gas pressures? (d) Calculate the total compressor work, and compare with the work for a single compressor with 85% efficiency without intercooling. (e) What is the gas turbine net work? (f) What is the total external heat addition? (g) How much heat is available from the precooler for district heating ? (h)What is the plant thermal efficiency? (i) What is the plant energy utilization factor if 80% of the precooler heat rejection is used for district heating? (j) If the turbines deliver 100MW of power, what is the air flow rate and (k) the rate of consumption of coal, in tons per hour (12,000 Btu/lbm heating value and 90% combustion efficiency)? ______________________ * Exercise numbers with an asterisk involve computer usage. 9.12 A closed-cycle gas turbine using air as a working fluid has an intercooler, a reheater, and a recuperator. The overall pressure ratio is 6. The low-pressure compressor has a pressure ratio of 2. Both compressors are driven by the high-pressure turbine. All turbomachines are 85% efficient. Compressor inlet temperatures are 15°C, and turbine inlet temperatures are 1000°C. Regenerator effectivenesss is 75%. (a) Draw T-s and flow diagrams, and label both compatibly. (b) Identify actual temperatures, in degrees Kelvin, at all stations of signif- icance.PDF Image | Advanced Systems Steam Power Plant
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