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Instructional Design Document
STAM Interactive Solutions
Rankine Cycle
Demo Outline (For reference)
Interactive pageEfficiency4
Animated pageRankine Cycle 3
Animated pageOrigin of Rankine Cycle 2
Animated pageGas-Vapor T-S Diagram1Page TypeTopic NameTopic Number
Change done on slide 14Quiz Question 5 Add “Liquid Metals” to list of choices
4
Change done on slide 12Quiz Question 3 Modify answer wording as marked
3
Slides 5, 6, 7 & 8 - saturation boundary made realistic
Overall Try to make the saturation boundary realistic – try to get from actual steam tables
2
Slide 5 – All areas marked as suggestedSlide 5 - Origin of Rankine Cycle – show superheated steam, shaded addedareas as compared to Carnot
1
Changes reflected on slide no.Changes Suggested by Prof. Gaitonde
Change Log (as per the minutes pdf)
Rankine CycleApplied Thermodynamics: Power Cycles
An important aspect that lead to modification of Carnot Cycle is the design of practical heat engines. Thus Rankine Cycle is a modified Carnot Cycle.
Rankine CycleApplied Thermodynamics: Power Cycles
Gas-Vapor T-S Diagram
Rankine CycleApplied Thermodynamics: Power Cycles
Origin of Rankine Cycle
Rankine CycleApplied Thermodynamics: Power Cycles
Rankine Cycle
Rankine Cycle
Rankine CycleApplied Thermodynamics: Power Cycles
Efficiency
Efficiency (%)
Set T1 and T3.
T
0
100
40
50
30
20
10
80
70
60
90
Compressor Inlet Temperature (T1):
Kelvin (Range: 283 to 313K)
Turbine Inlet Temperature (T3):
Kelvin (Range: 450 to 550K)
Saturation Boundary made
realistic
Note: The temperature bounds are illustrative, since the typical limits depend on the working fluid. Also the efficiency displayed is indicative.
Rankine CycleApplied Thermodynamics: Power Cycles
Resources
Books:1. G.J.Van Wylen's, "Thermodynamics“.
Reference Links:1. http://en.wikipedia.org/wiki/Rankine_cycle
Rankine CycleApplied Thermodynamics: Power Cycles
A Rankine Cycle is
an improvement on the Carnot Cycle
a modification of the Carnot cycle to yield higher efficiency
a modification of the Carnot cycle that results in lower efficiency but yields a design that is practical
Rankine CycleApplied Thermodynamics: Power Cycles
Rankine cycle involves
a closed cycle
an open cycle
depends on the working fluid
Rankine CycleApplied Thermodynamics: Power Cycles
The process in the Rankine Cycle that involves pumping the working fluid
is of the same nature as the Carnot Cycle
is isobaric, and uses more energy than an isothermal process would
is isobaric, and uses less energy than an isothermal process would if the right working fluid is selectedis isentropic, but uses almost the same energy as that in an isothermal process, because a liquid is being pumped
Rankine CycleApplied Thermodynamics: Power Cycles
To increase the efficiency of the Rankine Cycle
the pressure in the boiler should be lowered and the temperature in the condenser should be loweredthe pressure in the boiler should be raised and the temperature in the condenser should be lowered
the pressure in the boiler should be raised and the temperature in the condenser should be raisedthe pressure in the boiler should be lowered and the temperature in the condenser should be raised
Rankine CycleApplied Thermodynamics: Power Cycles
The most common working fluid encountered in Rankine-Cycle based machines is
Water / Steam
Ammonia
Freon
Liquid Metals