Fundamentals Of Engineering Thermodynamics
9th Edition
ISBN: 9781119391388
Author: MORAN, Michael J., SHAPIRO, Howard N., Boettner, Daisie D., Bailey, Margaret B.
Publisher: Wiley,
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Chapter 4, Problem 4.50P
To determine
The mass flow rate of the air.
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Steam at a pressure of 0.08 bar and a quality of 93.2% enters a shell-and-tube heat exchanger where it condenses on the outside of
tubes through which cooling water flows, exiting as saturated liquid at 0.08 bar. The mass flow rate of the condensing steam is 5.8 x
105 kg/h. Cooling water enters the tubes at 15°C and exits at 35°C with negligible change in pressure.
Neglecting stray heat transfer and ignoring kinetic and potential energy effects, determine the mass flow rate of the cooling water, in
kg/h, for steady-state operation.
mwater = i
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A counterflow heat exchanger operates at steady state while being well-insulated from the surroundings with air and ammonia flowing in separate streams. Ammonia enters at state 1 with -30°C and a quality of 30% and exits at state 2 as saturated vapor at -30°C. Air enters at state 3 with pressure 1 bar and temperature 295 K and exits at state 4 with pressure 1 bar and temperature 265 K. The flow rate of air is 10 kg/s. Ignore kinetic and potential energy effects, and take the dead state as 1 bar and 300 K.
a. Describe the heat transfer inside the heat exchanger (what is transferring heat to what?)
b. Determine the specific enthalpy of each state, in kJ/kg.
c. Determine the mass flow rate of ammonia, in kg/s.
d. Determine the rate of exergy destruction within the heat exchanger, in kW.e. Devise and evaluate an exergetic efficiency for the heat…
Steam enters the first-stage turbine shown in Figure (right) at 40 bar and 500°C with a volumetric flow rate of
90 m³/min. Steam exits the turbine at 20 bar and 400°C. The steam is then reheated at constant pressure to
500°C before entering the second-stage turbine. Steam leaves the second stage as saturated vapor at 0.6 bar.
For operation at steady state, and ignoring
stray heat transfer and kinetic and potential
energy effects, determine the
a. mass flow rate of the steam, in kg/h.
b. total power produced by the two stages of
the turbine, in kW.
Steam +
P₁ = 40 bar
T₁=500°C
(AV), -90 m³/min
Turbine
P=20 bar
7₂-400°C
2
Reheater
Qecheater
Turbine
20 bar
T₁-500°C
Saturated
vapor.
P4-0.6 bar
Power
Chapter 4 Solutions
Fundamentals Of Engineering Thermodynamics
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