1.Water vapor in a piston-cylinder is heated at a constant temperature of 400 o
F
from saturated vapor to a pressure of 100 lbf/in2
. Determine the work, in Btu per pound
of water vapor, by integration of Eqn. 2.17 in your textbook:
(a) numerically with steam table data (at least 10 data points in the considered
range)

2. Steam enters an insulated turbine operating at steady state with negligible
velocity at pressure and temperature measured as 4 MPa and 320 oC, respectively. The
steam expands to an exit pressure of 0.07 MPa and a velocity of 90 m/s. The diameter of
the exit is 0.6 m. State any assumptions and determine and plot the power developed by
the turbine, in kW, versus the steam quality at the turbine exit ranging from 0.8 to 1.0 (in
increments of 0.02 or less). Solve by hand for x = 0.8 and using any software package
(such as Excel) for the quality range. Discuss your findings and comment on the
desirability and the implications on actual turbine operation of a steam quality lesser than
1.

3. Technical Paper Assignment
Many new substances have been considered in recent years as potential working fluids
for power plants or refrigeration systems and heat pumps. What thermodynamic property
data are needed to assess the feasibility of a candidate substance for possible use as a
working fluid? Write a paper discussing your findings, following a customary format as
in the sample posted on the class website.
Students will work in groups of 2 – 3, each student in the group should contribute
equally and provide at least 4 cited publications (books, articles, research papers or other
technical publications) to support their case.