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1. THERMODYNAMICS
ASSIGNMENT
EC41FA2
Submitted to:
Engr. Joel Gatchalian
Date Submitted:
July 28, 2011

2. NAMES:
 Almarez, Melvin
 Balisi, Baby Liezel
 Claravall, Justine
 Jarabe, Crystel Ann
 Jose, Michell Anne
 Mercene, Ma. Laeka Ann
 Sarmiento, Czarina Jean
 Talavera, Jayson D.

3. 1. Assuming that there are
no heat effects and no
frictional effects, find the
kinetic energy and speed of
a 3220-lb body after it falls
778 ft from rest. Start with
the steady flow equation,
deleting energy terms
which are irrelevant.

4. Solution:

5. 2. A reciprocating compressor draws in
500 cubic feet per minute of air whose
density is 0.079 lb/cu.ft and discharges it
with a density of 0.304 lb/cu.ft. At the
suction, p1=15 psia; at discharge, p2= 80
psia. The increase in the specific
internal energy is 33.8 Btu/lb and the
heat transferred from the air by cooling
is 13 Btu/lb. Determine the work on the
air in Btu/min and in hp. Neglect change
in kinetic energy.

6. Solution:

8. 3. Steam enters a turbine
with an enthalpy of 1292
Btu/lb and leaves with an
enthalpy of 1098 Btu/lb. The
transferred heat is 13 Btu/lb.
What is the work in Btu/min
and in hp for a flow of 2
lb/sec?

9. Solution:

10. 4. A thermodynamic steady flow
system receives 4.56 kg per min of
a fluid where p1=137.90 kPa,
v1=0.0388 m3/kg, Ѵ1=122 m/s, and
u1=17.16 kJ/kg. The fluid leaves the
system at a boundary where
p2=551.6 kPa, v2=0.193 m3/kg,
Ѵ2=183 m/s and u2=52.80 kJ/kg.
During the passage through the
system the fluid receives 3000 J/s
of heat. Determine the work.

11. Solution:

13. 5. Air flows steadily at the rate of 0.5
kg/s through an air compressor, entering
at 7 m/s speed, 100 kPa pressure and
0.95 m3/kg specific volume, and leaving
at 5 m/s, 700 kPa, and 0.19 m3/kg. The
internal energy of the air leaving is 90
kJ/kg greater than that of the air
entering. Cooling water in the
compressor jackets absorbs heat from
the air at the rate of 58 kW. Compute the
work in kW.

14. Solution:

16. 6. In a steady flow apparatus, 135 kJ of
work is done by each kg of fluid. The
specific volume of the fluid, pressure, and
speed at the inlet are 0.37 m3/kg, 600 kPa,
and 16 m/s. The inlet is 32 m above the
floor, and the discharge pipe is at the floor
level. The discharge conditions are 0.62
m3/kg, 100 kPa, and 270 m/s. The total
heat loss between the inlet and discharge
is 9 kJ/kg of fluid. In flowing through this
apparatus, does the specific internal
energy increase or decrease, and by how
much?

17. Solution:

19. 7. Steam enters a turbine
stage with an enthalpy of
3628 kJ/kg at 70 m/s and
leaves the same stage with
an enthalpy of 2846 kJ/kg
and a velocity of 124 m/s.
Calculate the work done by
the steam.

20. Solution:

21. Group Pictures: 

22. THE END……
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