6.86 By injecting liquid water into superheated steam, the desuperheater shown in Fig. P6.86 has a saturated vapor stream at its exit. Steady-state operating data are provided
6.87 An inventor claims that at steady state the device shown in Fig. P6.87 develops power from entering and exiting streams of water at a rate of 1174.9 kW. The accompanying table provides data for inlet 1 and exits 3 and 4. The pressure at inlet 2 is 1 bar. Stray heat transfer and kinetic and potential energy effects are negligible. Evaluate the inventor's claim.
|
State
|
m(kg/s)
|
p(bar)
|
T(8C)
|
y(m3/kg)
|
u(kJ/kg)
|
h(kJ/kg)
|
s(kJ/kg? K)
|
|
1
|
4
|
1
|
450
|
3.334
|
3049.0
|
3382.4
|
8.6926
|
|
3
|
5
|
2
|
200
|
1.080
|
2654.4
|
2870.5
|
7.5066
|
|
4
|
3
|
4
|
400
|
0.773
|
2964.4
|
3273.4
|
7.8985
|
