ME300Lecture33 - Lecture 33: Rankine Cycle Improvements...

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33.1 Lecture 33: Rankine Cycle Improvements Basic Rankine Cycle:
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33.2 Rankine Cycle Performance Trends Effect of superheat on performance: » Reason: Increase average temperature for heat addition at a given boiler pressure increase in performance T 3 is limited by T H and materials Question: Why not increase T B instead? Answer: - Need high steam quality at turbine outlet to avoid corrosion (want x 4 > 0.9, better > 0.95) - Would require higher boiler pressure materials, safety
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33.3 Continue Rankine Cycle Performance Trends Continue effect of superheat on performance: » Consequence of superheating: T sup ( o F) x 4 0 0.186 0.858 100 0.190 0.913 500 0.217 >1.0 Note: » Increasing T sup has not a very big effect on thermal efficiency, but is needed to increase x 4 to a “practical” value!
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Continue Rankine Cycle Performance Trends Effect of boiler pressure on performance: - Increasing boiler pressure decreases heat input at relatively constant work output Increase in efficiency
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ME300Lecture33 - Lecture 33: Rankine Cycle Improvements...

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