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NESTER, RYAN TIMOTHY. Organic Rankine Cycles: A Comparative Study and Analysis of Multiple Applications.

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NESTER, RYAN TIMOTHY. Organic Rankine Cycles: A Comparative Study and Analysis of Multiple Applications. ( nester-ryan-timothy-organic-rankine-cycles-comparative-study )

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4.4 ETC STORC Analysis Solar thermal power plants have been operational in many places in the US since the 1980’s. Currently most solar thermal power plants are large-scale power plants that produce over 1 MW of electricity. These plants use parabolic troughs to heat organic based fluids to high temperatures then use the heat from that fluid to create steam and run a traditional Rankine cycle. Since most of these plants still use water as the working fluid in the power production cycle a solar thermal power plant that uses an organic based fluid in the power production cycle was investigated. Multiple types of STORC’s were analyzed and compared. First small-scale applications of STORC’s were investigated. These small-scale STORC’s were analyzed using evacuated tube collectors as the heat transfer mechanism between the sun and the heat transfer fluid. The working fluid in the collector was water. This type of STORC was investigated due to the relatively low cost of the ETC’s and the possibility of being a relatively cheap and widely applicable way to produce power. The first step in determining the amount of power able to produce by a STORC is to determine how much solar radiation the ETC can absorb. In order to accurately calculate this value many intermediate calculations have to be performed based on the configuration and thermodynamic properties of the collectors. ETC’s are stationary collectors and do not track the sun. Therefore a way to model the sun’s movement throughout the day was needed. It was determined to look at the changes in incidence angle throughout the day because the incidence angle is a measure of the angle at which the sun strikes the collector. Since it was found that the incidence angle varied from about zero to 90 degrees then back to zero on a 86

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