Steam Turbine T₁ = 600°C Pi= 20 bar n=10,000 kw T₂=400°C P10 bar V7 1200 K Py = 10 bar www www Heat exchanger Turbine 2 T₁=240°C Pe= 1 bar T₁ = 1500 K 5 Ps= 1.35 bar 1500 kg/min

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Chapter10: Heat Exchangers
Section: Chapter Questions
Problem 10.17P
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Problem 2
The figure below shows the integration of devices used in a steam power plant with a reheat
heat exchanger, and most of their operational data. The reheat heat exchanger is used to
supply heat to the steam that leaves Turbine 1 before it enters Turbine 2 by using "hot"
combustion gases. Combustion gases may be modeled as air and the devices may be assumed
to be perfectly insulated. Starting with the general form for the mass and energy conservation
expressions for a control volume, please answer the following questions.
Note: all property values used to solve this problem must be obtained from the thermodynamic
tables in your textbook, please list the table number used.
a. Compute the mass flow rate of steam passing through Turbine 1, in kg/s. List the
assumptions you used.
b. Estimate the temperature of the steam when it exits the heat exchanger, in °C. List the
assumptions you used. Use the method of variable specific heats for the hot combustion
gases stream modeled as air.
c. On a single T-v diagram represent the processes for the steam. Identify the states using
the same numbers given in the figure below. Include the saturation lines and relevant
property values associated to each state.
d. Compute the power produced by Turbine 2, in kW.
Steam
in
Turbine
1
T₁ = 600°C
P₁ = 20 bar
W = 10,000 kw
T₂=400°C
P=10 bar
Py = 10 bar
T₁=?
VT = 1200 K
P = 1 bar
www
www
Heat exchanger
Turbine
T₁=240°C
Pa = 1 bar
T₁ = 1500 K
-5 ps=1.35 bar
Air in
m= 1500 kg/min
Transcribed Image Text:Problem 2 The figure below shows the integration of devices used in a steam power plant with a reheat heat exchanger, and most of their operational data. The reheat heat exchanger is used to supply heat to the steam that leaves Turbine 1 before it enters Turbine 2 by using "hot" combustion gases. Combustion gases may be modeled as air and the devices may be assumed to be perfectly insulated. Starting with the general form for the mass and energy conservation expressions for a control volume, please answer the following questions. Note: all property values used to solve this problem must be obtained from the thermodynamic tables in your textbook, please list the table number used. a. Compute the mass flow rate of steam passing through Turbine 1, in kg/s. List the assumptions you used. b. Estimate the temperature of the steam when it exits the heat exchanger, in °C. List the assumptions you used. Use the method of variable specific heats for the hot combustion gases stream modeled as air. c. On a single T-v diagram represent the processes for the steam. Identify the states using the same numbers given in the figure below. Include the saturation lines and relevant property values associated to each state. d. Compute the power produced by Turbine 2, in kW. Steam in Turbine 1 T₁ = 600°C P₁ = 20 bar W = 10,000 kw T₂=400°C P=10 bar Py = 10 bar T₁=? VT = 1200 K P = 1 bar www www Heat exchanger Turbine T₁=240°C Pa = 1 bar T₁ = 1500 K -5 ps=1.35 bar Air in m= 1500 kg/min
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