Assume that the throttling valves, flash evaporators, mixing chamber and tu me the properties of the fishy water to be the same as water. ) Determine the mass flow rate at states 3 and 4. ) Determine the enthalpy at state 5 and the power required by the pump. ) What is the heat transfer to the heat exchanger? ) Determine the mass flow rate at state 9. ) How much power is produced by the turbine?
Assume that the throttling valves, flash evaporators, mixing chamber and tu me the properties of the fishy water to be the same as water. ) Determine the mass flow rate at states 3 and 4. ) Determine the enthalpy at state 5 and the power required by the pump. ) What is the heat transfer to the heat exchanger? ) Determine the mass flow rate at state 9. ) How much power is produced by the turbine?
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Question
part a b and c

Transcribed Image Text:A two-stage flash evaporation system, as shown in the figure, is used to concentrate the waste water from
a fish plant (fishy water) and generate electricity. The 2 kg/s fishy water is heated and pumped to the two-
stage flash evaporation system at a pressure of 2000 kPa and 160 °C, state 1. The fishy water is throttled
before entering the first flash evaporator, which forms a fishier liquid stream (state 4) and a vapour at 350
kPa (state 3).
The fishy water liquid stream from the first flash evaporator is further concentrated in a second flash
evaporator. The fishy liquid is first compressed by a pump to a pressure of 2000 kPa, state 5, before
entering a heat exchanger where the fishy liquid is heated to 200 °C at constant pressure, state 6. The
fishy water is then throttled and enters the second flash evaporator at a pressure of 350 kPa, state 7. The
concentrated fishier liquid stream and the vapour streams exits at states 8 and 9 respectively.
The vapor streams from the flash evaporators are combined in a mixing chamber and exit at state 10. The
combined vapour stream is then expanded through a turbine exiting as a saturated vapour at 50 kPa, state
11. Assume that the throttling valves, flash evaporators, mixing chamber and turbine are adiabatic and
assume the properties of the fishy water to be the same as water.
a) Determine the mass flow rate at states 3 and 4.
b) Determine the enthalpy at state 5 and the power required by the pump.
c) What is the heat transfer to the heat exchanger?
d) Determine the mass flow rate at state 9.
e) How much power is produced by the turbine?
T,= 160°C
P,=2000 kPa
P,=350 kPa
sat. vapor
P,=P,=P,
Flash
Evap.
m, =2 kg/s
Throttling
Valve
P,=350 kPa
sat. vapor
P,=P,=P,
Flash
Mixing
Chamber
10
Evap.
P.=350 kPa
sat. liquid
Turbine
P,=350 kPa
sat. liguid
Heat Exchanger T,=200°C
P,-2000 kPa
P=50 kPa
sat. vapor
dund
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