thermodynamics II PLEASE know your stuff
bad_student
160383043_designfall2016_eue231_3_1.docx
ME 4293 Thermodynamics II Name: ______________________________
Design Project, Fall 2016 UTSA (abc123): _______________________
Key (1st column in table): _______________________
A combined cycle plant operates with a topping gas turbine and a bottoming vapor turbine cycle. The working fluid in the vapor turbine cycle is water.
Use Excel and thermodynamics property evaluation add-in for steam available from BB/Learn. For air use perform a cold air-standard analysis using the following values: cp = 1.005 kJ/kgK, cv =
0.718 kJ/kgK, k=1.40, M=28.97 kg/kmol. Let T0 = 25°C and P0=100 kPa
|
key |
student |
Wnet T4 (K) |
P8 (kPa)
|
T8 (C) |
T10 (C) |
Regenerator Effectiveness |
Compressor Pressure Ratio |
Gas Compressor Isentropic Efficiency |
Gas Turbine Isentropic Efficiency |
Vapor Turbine Isentropic Efficiency |
Pump Isentropic Efficiency |
|
101 |
eue231 |
1280 |
160 |
260 |
38 |
80% |
13 |
78% |
90% |
86% |
82% |
Let T0 = 25°C and P0=100 kPa Analyze the system and determine the following:
mg = _______________ (mass flow rate through gas cycle turbine)
mv = _______________ (mass flow rate through vapor cycle turbine)
Wgtc = ______________ (shaft power to the GTC generator)
Wvtc = ______________ (shaft power to the VTC generator)
Qin = ______________ (rate of heat transfer to gas flowing through combustor)
Qout = ________________ (rate of heat rejection in condenser)
Ef ,comb = ______________ (rate of exergy increase in gas flowing through combustor)
Ed,cond = ______________ (rate of exergy destruction in condenser)
Ed,evap = ______________ (rate of exergy destruction in evaporator)
th = _______________ (plant thermal efficiency, conversion of heat to electric)
II = ______________ (plant second law efficiency)
If you switched fluids from H2O to R134a in the Vapor Turbine Cycle, what would be appropriate values at state 8, such that the outlet quality at state 9 is between 0.95 and 0.99
P8= ______________ (pressure into vapor turbine)
T8 = ______________ (temperature into vapor turbine)
Turn in paper copy of solution that includes:
1) All pages of this handout
2) Hand calculations
3) Excel showing plant results
4) Excel showing underlying equations
5) ("ctrl ~ " to expose formula) 6) Excel showing plant results with 7) design change.
Do NOT share Excel files with other students.
