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i. Example 3 -- Large Scale Solar-Thermal Energy Conversion System Utilizing Intermediate (60O0F) Peak Temperatures In this example, several cycles and working fluids were'examined to determine which system would be the most cost effective based on the cost of cbllectors and storage. As in example 2, the number and cost of collectors goes up with decreasing cycle efficiency and the cost of sensible heat storage goes up with decreasing AT. The system parameters for this example were chosen to be compatible with those being studied for several applications including the central power plant size cited. The results of the analyses are summarized in Table I. T-S and T-H plots for the ideal cycles are shown in Figures 9 through 16. TABLE I Summary of Cycle Impact on Conversion Efficiency and Sensible Heat Source AT f . =t I Cycles 1 and 2 in Table I indicate that superheat cycles using water and toluene have roughly equivalent efficiencies and result inapproximately the same temperature drop in the heating medium at a given efficiency level. Increasing the amount of superheat in both cycles decreases cycle effi- ciency and increases the heat source temperature drop and cohversely for a decrease in the level of superheat. 1 Cycle 3 was an attempt to find a suitable fluid and cycle which would not require either a re- heater or a regenerator (to minimize costs) and yet. be supercritical or nearly so to get a large AT in the heating source. Fluorinal-50 9 is a 50 mole percent trifluoroethanol - 50 mole percent water i *Registered trademark of the Halocarbon Products Corp. Cycle Efficiency' Cycle Cycle Temperatures Ideal/Non-Ideal Sensible Heating Source AT (Ideal) Number Working Fluid HighlLow in O F in % 1 Water sso~eo 35/29 185 2 Toluene 6OOllOO 31/30 190 3 Fluorinol-502 600llOO 2311a 290 4 Trifluoroethanol 600/100 33/28 340 Notes: 1. Non-ideal cycle calculations assume the followingcomponent efficiencies which might be typical of a 300 MWe plant: Generator Efficiency - 0.98 Turbine 6r Feed Pump Efficiencies - 0.85 Regenerator (where used) Efficiency - 0.90 Pressure Drop Lssses and Parasitic Power Losses Not Considered 2. Registered trademark ofthe Halocarbon Products Corporation in OF Comments Superheat cycle with two reheats. Maximum pres- sure is600psia. Superheat cycle with regenera- tion. Maximum pressure is 200 psia. Superheat cycle without re- generation. Maximum pres- sureis900 psia. Supercritical cycle with regen- eration. 800 psia. Maximum pressure is 13PDF Image | RANKINE CYCLE ENERGY CONVERSION SYSTEM DESIGN CONSIDERATIONS FOR LOW AND INTERMEDIATE TEMPERATURE SENSIBLE HEAT SOURCES
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