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Instructor (Circle One): Brown Dancey Uzgoren-MWF 10 U zgoren-MWE Il
ME 3134 Your Name te ce
Test 3
This is a closed book test. You may use your equation sheet and the tables you printed out from
Blackboard. Show your work completely to reccive an appropriate amount of partial credit.
Make sure that you also write your name at the back of the last page.
T neither gave nor accepted unauthorized help on this test.
Your signature i
1. (25) Hydrogen (2) at 25 °C, 1 bar enters a steady state combustion chamber with a
molar flow rate of 0.1 kmol/s and burns with 0.5 kmol/s of oxygen (Qo) entering at 25 °C, 1 bar.
If the products leave the chamber at 25 °C, 1 bar, determine the heat released to the surroundings
in kW. Kinetic and potential energy effects are negligible. The molecular weight of hydrogen is
2 kg/kmol and the molecular weight g of oxygen is 32 Kekmol
, a
QW amie rg Qe
“Seu oa
ar ~~ EON en L
Me +5 O, 8 Woe -eO 2
bay
bee SO 2 ~ISG Re tly g
Hel (g
oma
NO Stl = USES WY k 4 brads
2 (25) Consider an ideal (internally reversible) Rankine cycle operating between a pressure
of 80 bar and 0.08 bar where the steam entering the turbine is a saturated vapor and the steam
leaving the condenser is a saturated liquid.
{a) On the axes provided above, draw the T-s diagram for this cycle and label the states as
indicated in this sketch. Show the lines of consiant pressure.
(b) Fill in the missing values in the table below with the correct entries.
State EP, bar T, °C u, ki/kg h, kI/kg s kI/ke-K | vy m/ke
1 [80.0 293.1 2569.78 [2757.94 15.7431 | 0.02352 |
2 0.08 1697.10 | 1794.77, forde) | 12.2087 |
3 0.08 173.87 173.88 | 0.5926 0.00101 |
4 80.0 1133.87 ACU 5 | EK O¢.] 0.00101 ~|
NA. Aes =. Wey = Tee - =O Re Pad= O@ento- Oca io)
— (7S, Ch 4 Ces = - (Eh La wi ha
€ 2 What is the heat aces to the steam in the boiler in kJ/kg? ?
hee = Wk 4 = EISIGSACLAG = qre WA hoy
(d) What is the rejected from the steam in the condenser in kI/kg?
wo Myo Ba = O93 KR IAG TD) = el KT
ye VL A I rhe
()
ee ee ale eRe.
on & fot g fy 4
