Modern Engineering Thermodynamics

Problems 95
specific enthalpy of saturated liquid water at 50.0°C by
1.00 kJ/kg.
55. Determine the properties required in Table 3.12.
Table 3.12 Problem 55
Substance Given Find
a. Ammonia T = 0.00°C
x = 0.200
b. Water p = 400. psia
h = 1000. Btu/lbm
c. Water T = 500.°F
p = 400. psia
d. Refrigerant-134a p = 185.82 psia
h = 51.47 Btu/lbm
v =?
x =?
u =?
v =?
56.* The Kara Maru is a transport vessel that has inadvertently
entered an enemy neutral zone. She carries 600 passengers and
has radioed that she has blown her super-lumen drive system.
The Star Command distress codes are taken from the tables of
the thermodynamic properties of water, because the enemy has
a very poor knowledge of this substance. Therefore, if there are
any errors in the code, it may be a trap and not a real distress
call. Is the transmission in Table 3.13 correct? If not, what are
the errors? (Variations of less than 1% are not errors.)
Table 3.13 Problem 56
p (kPa)
T (°C)
v
(m 3 /kg)
u
(kJ/kg)
h
(kJ/kg)
x
(quality)
600. 600. 0.6696 2801.7 3700.7
0.6113 0.0100 206.1 2375.3 2501.3 1.00
100. 99.6 0.001043 417.3 417.4 0.00
a. The standard reply to all such distress messages is to transmit
the properties of water at 100% quality and 3000 kPa. What
are those values?
p = 3000. (kPa) u =?
T =? h =?
v =?
b. At this point, your reply is acknowledged with T = 200.°C,
p = 1554.9 kPa, x = 0.23.
Is the acknowledgment from the Kara Maru or the enemy?
Explain.
57. Using the tables in Thermodynamic Tables to accompany Modern
Engineering Thermodynamics, fill in the missing properties in
Table 3.14.
58. Using the tables and charts in Thermodynamic Tables to accompany
Modern Engineering Thermodynamics, fill in the missing properties
in Table 3.15.
59. Using the tables and charts in Thermodynamic Tables to accompany
Modern Engineering Thermodynamics fill in the missing properties
in Table 3.16.
60. Using the tables and charts in Thermodynamic Tables to accompany
Modern Engineering Thermodynamics, fill in the missing properties
in Table 3.17.
61. a. Using only the thermodynamic tables in Thermodynamic
Tables to accompany Modern Engineering Thermodynamics, fill in
the missing properties in Table 3.18.
b. Using only the thermodynamic charts in the tables book, fill
in the missing properties in Table 3.19.
62. Using the tables and charts in Thermodynamic Tables to accompany
Modern Engineering Thermodynamics, fill in the missing properties
in Table 3.20.
63. Using the tables and charts in Thermodynamic Tables to accompany
Modern Engineering Thermodynamics, fill in the missing properties
in Table 3.21.
64. Using the tables and charts in Thermodynamic Tables to accompany
Modern Engineering Thermodynamics, fill in the missing properties
in Table 3.22.
65. Using the tables and charts in Thermodynamic Tables to accompany
Modern Engineering Thermodynamics, fill in the missing properties
in Table 3.23.
66. Using the tables and charts in Thermodynamic Tables to accompany
Modern Engineering Thermodynamics, fill in the missing properties
in Table 3.24.
67. Using the tables and charts in Thermodynamic Tables to accompany
Modern Engineering Thermodynamics, fill in the missing properties
in Table 3.25.
68. Using the tables and charts in Thermodynamic Tables to accompany
Modern Engineering Thermodynamics, fill in the missing properties
in Table 3.26.
Table 3.14 Problem 57
Material T (°F) p (psia) u (Btu/lbm) v (ft 3 /lbm) ρ (lbm/ft 3 ) x
Water ? 60.0 ? ? ? 1.00
Water ? 80.0 ? ? ? 0.600
Ref.-134a ? 23.805 62.124 ? ?
Table 3.15 Problem 58
Substance p (psia) T (°F) v (ft 3 /lbm) h (Btu/lbm) u (Btu/lbm)
H 2 O 300. ? 0.7811 ? ?
H 2 O 300. 600. ? ? ?
Ref.-134a ? 70.0 0.2526 ? ?
Nitrogen 50.0 ? 1.00 ? ?