Download Thermodynamic (I) PE200 Assignment #6

‫جامعه فاروس‬
‫كلية الهندسة‬
‫قسم البتروكيماويات‬
Pharos University
Faculty of Engineering
Petrochemical Department
Thermodynamic (I) PE200
Assignment #6
1.A 0.5-m3 rigid tank contains refrigerant-134a initially at 160 kPa and 40 percent quality.
Heat is now transferred to the refrigerant until the pressure reaches 700 kPa. Determine
(a) the mass of the refrigerant in the tank and
(b) the amount of heat transferred. Also, show the process on a P-v diagram with respect to
saturation lines.
2.A 20-ft3 rigid tank initially contains saturated refrigerant- 134a vapor at 160 psia. As a
result of heat transfer from the refrigerant, the pressure drops to 50 psia. Show the process
on a P-v diagram with respect to saturation lines, and determine:
(a) the final temperature,
(b) the amount of refrigerant that has condensed,
and (c) the heat transfer.
3. An insulated piston–cylinder device contains 5 L of saturated liquid water at a constant
pressure of 175 kPa. Water is stirred by a paddle wheel while a current of 8 A flows for 45
min through a resistor placed in the water. If one-half of the liquid is evaporated during
this constant pressure process and the paddle-wheel work amounts to 400 kJ, determine
the voltage of the source. Also, show the process on a P-v diagram with respect to
saturation lines
4. A piston–cylinder device contains 0.5 lbm of water initially at 120 psia and 2 ft3. Now
200 Btu of heat is transferred to the water while its pressure is held constant. Determine
the final temperature of the water. Also, show the process on a T-v diagram with respect to
saturation lines.
5. An insulated tank is divided into two parts by a partition. One part of the tank
contains 2.5 kg of compressed liquid water at 60°C and 600 kPa while the other part
is evacuated. The partition is now removed, and the water expands to fill the entire
tank. Determine the final temperature of the water and the volume of the tank for a
final pressure of 10 kPa.