app thermo l5 annotated
DESCRIPTION
ThermolectureTRANSCRIPT
2/06/2015
Curtin University is a trademark of Curtin University of TechnologyCRICOS Provider Code 00301J
Applied Thermodynamics and Heat Transfer
Curtin University is a trademark of Curtin University of TechnologyCRICOS Provider Code 00301J
2/06/2015
Exam format
Applied Thermodynamics & Heat Transfer
• 4 questions, equally weighted (25% each)• 2 hours plus 10 minutes reading time• 2 x Heat Transfer, 2 x Applied Thermo• Applied Thermo:
Rankine Cycle “Other”
• Standard exam conditions apply, ie only HP10s/10s+ calculators, steam tables supplied
Curtin University is a trademark of Curtin University of TechnologyCRICOS Provider Code 00301J
2/06/2015
2010 Class Test Q1
Applied Thermodynamics & Heat Transfer
A steam power plant operates on the ideal Rankine Cycle and produces 15 MW of net power output. The boiler of the plant generates superheated steam at 100 bar and 500oC and, feeds the High-Pressure turbine where the steam expands isentropically to dry saturated vapour state at the turbine exhaust. The steam is then reheated in an independent reheater to 400oC and supplied to the Low-Pressure turbine where the steam undergoes isentropic expansion to a final condenser pressure of 0.05 bar. It may be assumed that the feed pump work is negligible.
(a) Sketch the T-s diagram of the plant cycle, indicating all relevant states.(4 Marks)
(b) Calculate the exhaust pressure of steam from the High-Pressure turbine and the dryness fraction of steam at the Low-Pressure turbine exit.
(15 Marks)(c) Find the mass flow rate of steam (kg/s) in the plant and the heat supplied to the reheater.
(8 Marks)(d) Determine the overall thermal efficiency of the plant.
(5 Marks)
Curtin University is a trademark of Curtin University of TechnologyCRICOS Provider Code 00301J
2/06/2015Applied Thermodynamics & Heat Transfer
T
s
Curtin University is a trademark of Curtin University of TechnologyCRICOS Provider Code 00301J
2/06/2015Applied Thermodynamics & Heat Transfer
Curtin University is a trademark of Curtin University of TechnologyCRICOS Provider Code 00301J
2/06/2015Applied Thermodynamics & Heat Transfer
Curtin University is a trademark of Curtin University of TechnologyCRICOS Provider Code 00301J
2/06/2015Applied Thermodynamics & Heat Transfer
Curtin University is a trademark of Curtin University of TechnologyCRICOS Provider Code 00301J
2/06/2015
2012 Exam Q4
Applied Thermodynamics & Heat Transfer
Curtin University is a trademark of Curtin University of TechnologyCRICOS Provider Code 00301J
2/06/2015
2004 Th231/232 Exam Q5
Applied Thermodynamics & Heat Transfer
Curtin University is a trademark of Curtin University of TechnologyCRICOS Provider Code 00301J
2/06/2015
2004 Th231/232 Exam Q5
Applied Thermodynamics & Heat Transfer
Curtin University is a trademark of Curtin University of TechnologyCRICOS Provider Code 00301J
2/06/2015Applied Thermodynamics & Heat Transfer
Curtin University is a trademark of Curtin University of TechnologyCRICOS Provider Code 00301J
2/06/2015Applied Thermodynamics & Heat Transfer
Curtin University is a trademark of Curtin University of TechnologyCRICOS Provider Code 00301J
2/06/2015
2010 Exam Q4
Applied Thermodynamics & Heat Transfer
An open-cycle gas turbine plant operates on the air-standard Brayton cycle with the turbine and the compressor each having an isentropic efficiency of 0.8. The atmospheric air enters the compressor at 100 kPa and 300 K, and is compressed to 900 kPa. The compressed air is heated to 1400 K in the combustion chamber and supplied to the turbine. The turbine discharges the expanded air back to the atmosphere. The air behaves as an ideal gas with cp = 1.005 kJ/kg.K and cv = 0.72 kJ/kg.K. Sketch the T-s diagram for the plant cycle indicating all relevant thermodynamic states. Find the net work output of the plant per kilogram of air and the overall thermal efficiency.
(16 Marks)The plant is modified by routing the turbine exhaust through a 100 percent effective heat exchanger placed between the compressor and the combustion chamber to reduce the final air discharge temperature to 650 K. Sketch the plant layout and calculate the thermal efficiency of the modified plant.
(9 Marks)
(Total 25 Marks)
Curtin University is a trademark of Curtin University of TechnologyCRICOS Provider Code 00301J
2/06/2015Applied Thermodynamics & Heat Transfer
T
s
Curtin University is a trademark of Curtin University of TechnologyCRICOS Provider Code 00301J
2/06/2015Applied Thermodynamics & Heat Transfer
Curtin University is a trademark of Curtin University of TechnologyCRICOS Provider Code 00301J
2/06/2015
2004 Th231/232 Exam Q5
Applied Thermodynamics & Heat Transfer