SME026_5P0434Rankine Cycle- Regeneration

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STAM Interactive Solutions

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Demo Outline (For reference)‏ Topic Number Topic Name Page Type 1 Regeneration Animated page 2 Open Feed Water Heaters Animated page 3 Efficiency Interactive page

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Slides 4, 5, & 7 - saturation boundary made realistic Overall Try to make the saturation boundary realistic – try to get from actual steam tables 7 Slide 13 – Text changed as suggested Quiz Question 5 - Replace “compressor” with “pump” 6 Slide 11 - Changed as suggested Quiz Question 3 – Correct answer is 3 not 2 5 Slide 9 & 10 – The previous questions have been moved to Reheat IDD. Two new questions have been added. Quiz Questions 1 and 2 are for reheat 4 Slide 7 – Also see the notes for guidelines & formulae used Efficiency may not be displayable –use formulae as marked by the professor 3 Slide 6 – Zoom in animation included Slide 6 - convert to zoomed-in figure 2 Slide 6 – Closed feed water heater type deleted. Omit feed heater types 1 Changes reflected on slide no. Changes Suggested by Prof. Gaitonde Change Log (as per the minutes pdf)‏

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One of the ways to increase the efficiency of the Rankine Cycle is to increase the temperature of the fluid entering the boiler.

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Regeneration

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Open Feed Water Heaters Open Feed Water Heater System with an Open Feed Water Heater

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Efficiency Efficiency (%)‏ Set T1 and T3. 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: 500 to 700K)‏ Note: The temperature bounds are illustrative, since the typical limits depend on the working fluid. Also the efficiency displayed is indicative. Mass Fraction (m): Q supplied : Q rejected :

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Resources Books: G.J.Van Wylen's, "Thermodynamics“. Reference Links: www.heatexchange.org/pub/pdf/edu/Tech%20Sheet%20127.pdf http://www.personal.utulsa.edu/~kenneth-weston/chapter2.pdf

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The T-S diagram for the basic Rankine cycle is an excellent way to visualize the thermal efficiency. For the regenerative Rankine cycle the T-S diagram is just as useful in visualizing thermal efficiency the T-S diagram is slightly more complicated from a thermal-efficiency visualization point of view because of the different mass flow rates through various components the T-S diagram should not be used to visualize the thermal efficiency

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The use of regeneration in the Rankine cycle to increase thermal efficiency of the cycle is limited by the extra components required by a practical implementation limited by the efficiency of the heat exchanger limited by the characteristics of the working fluid uniquely defined by the lower and higher temperatures of the working fluid.

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A Rankine cycle with an ideal regenerative cycle has an efficiency exactly equal to that of a Carnot cycle operating between the same temperatures more than that of a Carnot cycle operating between the same temperatures less than that of a Carnot cycle operating between the same temperatures depends on the working fluid

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The number of regenerative stages is limited by the achievable efficiency the pressure of the working fluid cost of added equipment

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In a regenerative cycle mass of steam entering the turbine is the same as the mass of steam entering the pump mass of steam entering the turbine is more than the mass of steam entering the pump mass of steam entering the turbine is less than the mass of steam entering the pump depends on the design of the feedwater heater

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