Power Plant Technology Steam and Gas Cycle Power Plant (Assignment 2)

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Presentation transcript:

Power Plant Technology Steam and Gas Cycle Power Plant (Assignment 2) by Mohamad Firdaus Basrawi, Dr. (Eng) Mechanical Engineering Faculty mfirdausb@ump.edu.my

CL 1B 1. Determine why Titanium cooling tower is the most suitable material for condensor that works with sea water. 2. Characterize type of cooling towers that are used for power plants.

EXAMPLE A simple Brayton cycle has a pressure ratio of 10, and air works as the working fluid. Determine air temperature at turbine exit, thermal efficiency and net work output. It should be noted that Cp= 1.005kJ/kg.K, k= 1.4, Tit= 1240K, Tamb=295K, nT= 0.87, nc=0.83.

EXAMPLE A simple Brayton cycle has a pressure ratio of 10, and air works as the working fluid. Determine air temperature at turbine exit, thermal efficiency and net work output. It should be noted that Cp= 1.005kJ/kg.K, k= 1.4, Tit= 1240K, Tamb=295K, nT= 0.87, nc=0.83.

EXAMPLE

EXAMPLE An ideal Brayton cycle has a pressure ratio of 8, compressor inlet of 300 K, and turbine inlet temperature of 1300K. Assume specific heat at constant pressure and specific heat ratio at all stages of the gas turbine as cp= 1.006kJ/kgK and k= 1.4, respectively. Determine (a) Temperature at the compressor and turbine outlet. (b) Thermal efficiency. Assumptions 1 Air-standard assumptions. 2 Steady state operating conditions exist.

CL 1C An ideal Brayton cycle with air as working fluid has a pressure ratio of 12. Compressor inlet and turbine inlet temperature are at 300K and 1000K, respectively. If power output is 70MW, determine the mass flow rate. Calculate for 2 cases, compressor and turbine isentropic efficiency are 100%, compressor and turbine isentropic efficiency are 85%. Use cp=1.005kJ/kg and k= 1.4. A gas turbine engine has compressor inlet temperature of 300K and pressure of 100kPa, and then compressed to 700kPa and 580K. Combustion supply heat of 950kJ/kg to the air before it enters a turbine. If the turbine efficiency is 86%: the fraction of the turbine work used to run the compressor and the thermal efficiency. are to be determined

EXAMPLE Steam in ideal rankine cycle enters a turbine at 3MPa and 350oC and leaves a condenser at a pressure of 10kPa. the thermal efficiency, the thermal efficiency if turbine inlet temperature rises to 600oC, and the thermal efficiency if the boiler pressure rises to 15MPa with turbine inlet temperature of 600oC are to be determined

(a) The thermal efficiency is determined as below:

(b) States 1 and 2 remain, and the enthalpies at state 3(3Mpa and 600oC) and state 4 (10kPa and s4=s3) are determined to be

(c) State 1 remains, but the other states change (c) State 1 remains, but the other states change. The enthalpies at state 2 (15Mpa and s2 = s1), state 3 (15Mpa and 600oC), and state 4(10kPa and s4 = s3) are determined in similar manner to be