ASSIGNMENT 1
ERT 206
It is a group assignment. Each group must submit 1 assignment. Please hand in
before 12th June 2015. Marks will be deducted for late submission. Marks will be
deducted for those who do not have cover that consist of title, group number
(eg: A1) and name of group members. Thanks!
1. Is there any difference between intensive properties of saturated vapor at
a given temperature and the vapor of a saturated mixture at the same
temperature?
2. A heat engine is operating on a carnot cycle and has a thermal efficiency
of 75 percent. The waste heat from this engine is rejected to a nearby lake
at 15 °C at a rate of 800 kJ/min. Determine a) the power input of the
engine; and b) the temperature of the source.
3. A 600-MW steam power plant, which is cooled bt a nearby river has a
thermal efficiency of 40 percent. Determine the rate of heat transfer to
the river water. Will the actual heat transfer rate be higher or lower than
this value? Please explain why.
4. A piston-cylinder device initially contains 1.4 kg saturated liquid water at
200 °C. Now heat is transferred to the water until volume quadruples and
the cylinder contained contains saturated vapor only. Determine a) the
volume of the tank, b) final Temperature and pressure, c) internal change
of the water.
5. A cylinder contains 0.014 m3 of a fluid at 7 bar having a specific enthalpy
of 695 kJ/kg, and a specific volume of 0.00125 m3/kg. Heat energy is
supplied until the volume of the fluid becomes 0.28 m3, the pressure
remaining at 7 bar. If the final specific internal energy of the fluid is 885
kJ/kg, calculate: a. the mass of fluid
b. the final specific volume
c. the heat energy supplied
d. the work energy transferred.
-HIZ-