552Rankine Cycle Engine Performance

Heat source and heat sink temperatures have a strong effect on Rankine cycle efficiency. As shown in Figure 5.22, efficiency for organic Rankine cycle engines ranges from 7-10% for systems using heat source temperatures near 200°F to 25-30% for 600 to 1200°F sources. For comparison, efficient, fossil fueled, power plant Rankine cycles operating at high power levels and high temperatures exhibit cycle efficiencies in the 35 to 40% range. Using the cycle efficiency information in Figure 5.22, the potential power output of a low temperature, organic Rankine cycle engine can be estimated. Figure 5.23 shows predicted power as a function of heat source temperature and amount of available heat.

Solar Stirling Engine Basics Explained

Solar Stirling Engine Basics Explained

The solar Stirling engine is progressively becoming a viable alternative to solar panels for its higher efficiency. Stirling engines might be the best way to harvest the power provided by the sun. This is an easy-to-understand explanation of how Stirling engines work, the different types, and why they are more efficient than steam engines.

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