Homework #1 Material
Reading Assignment: All of Chapter 1.
State of a system
4.57 At steady state, a well-insulated compressor takes in nitrogen at 60°F, 14.2 lbf/in.2,
with a volumetric ﬂow rate of 1200 ftsfmin. Compressed nitrogen exits at 500°F, 120
lbf/in.2 Kinetic and potential energy changes from inlet to ex
4.93 A horizontal constant-diameter pipe with a build-up of debris is shown in Fig. P4.93. Air
modeled as an ideal gas enters at 320 K, 900 kPa, with a velocity of 30 m/s and exits at 305 K.
Assuming steady state and neglecting stray heat transfer, determ
4.69 During cardiac surgery, a heart-lung machine achieves extracorporeal circulation of the
patients blood using a pump operating at steady
4.91 Steam enters a partially-open valve operating at steady state as saturated liquid at 300oF
and exits at 60 lbf/in.2 Neglecting kinetic and potential energy effects and any stray heat transfer
with the surroundings, de
Conversion factors often used for the work term:
1 W = 1 J/s (1 kW = 1 kJ/s)
1 hp = 550 ft-lbf/s
Note the small
contribution of the
terms to the overall
PROBLE M 5- ‘l
5.9. Use the Kelvin—Planck statement of the second law to
show that the specified process is irreversible.
(a) As shown in Fig. P5.9a. a hot thermal reservoir is
separated from a cold thermal reservoir by a cylindrical rod
insulatern its la
Using the appropriate tables, determine the change in specific entropy between the specified
states, in Btu/lboR. Show the states on a sketch of the T-s diagram.
(a) water, p1 = 10 lbf/in.2, saturated vapor; p2 = 500 lbf/in.2, T2 =
Class meets from 3:30 to 4:45 on Tuesdays and Thursdays. On days for which there is no
quiz, a full lecture will be given. On days for which there is a quiz, the 15 minute quiz
will be given at the end of the clas
Water vapor at 1000oF, 140 lbf/in.2 enters a turbine operating at steady state and expands to 2
lbf/in.2, 150oF. Stray heat transfer and kinetic and potential energy effects are negligible.
Determine the actual wo
Should be 1.986
A system consisting of 2 kg of water initially at 160oC, 10 bar, undergoes an internally
reversible, isothermal expansion during which there
SCHEMATIC AND GIVEN DATA: See Fig. P4.17.
Problem 4.17, continued
4.21 Air enters a compressor operating at steady state with a pressure of 14.7 lbf/in.2 and a
volumetric flow rate of 8 ft3/s. The air velo
4.34 Air with a mass flow rate of 2.3 kg/s enters a horizontal nozzle operating at steady state at
450 K, 350 kPa, and velocity of 3 m/s. At the exit, the temperature is 300 K and the velocity is
460 m/s. Using the ideal gas model for air with constant cp
. LEARNING OUTCOMES
When you complete your study of this chapter, you will be able to .
.,. explain key concepts, including phase and pure substance, state
principle for simple compressible systems, p-v-T surface, saturation