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The analysis of this cycle is identical to the Rankine cycle case with the added simplicity of only a single heat addition and rejection process modeled using an effectiveness-NTU technique. The efficiency of the ideal power producing cycle can be described by an internally-reversible power cycle efficiency analogous to the Carnot efficiency: 2 3 3−4 power cycle working fluid. The interest in analyzing this cycle is to establish the limits of theoretical powerplant performance. As such, a “cold” resource capacitance rate that is much larger (m& H CH << m& LCL ) than the “hot” resource capacitance rate is considered. This arrangement is not an unreasonable approximation of reality as high capacitance rates in power cycle cooling improve performance and have little cost relative to the “hot” resource (fuel). The results of the analysis of each case are shown in Figure 5.6 in the same power-efficiency variable space that the Carnot and Rankine cycle results were presented. Note that the fundamental relationship between power, power cycle efficiency, and UA is unchanged. However, as UA increases, a lower bound on achievable cycle efficiency emerges. As UA becomes very large cycle efficiency is limited to values larger than the CNCA efficiency. The shape of the curves remains unchanged, indicating that maximum power production occurs at the minimum achievable cycle efficiency. The efficiency that is approached as UA goes to infinity is here defined as ηMP: Q ∫Tds T∆S η=1− L =1−1 =1− 1−2 = 71 where T 1−2 η =1− 2TL,in MP [5.2.17] [ 5 . 2 . 1 8 ] [5.2.16] and T are the average temperatures of heat addition and heat rejection in the Q4 T∆S H ∫Tds 3−4 TH,in +TL,in and the corresponding power at ηMP: & W M P = m& H C H T + T 2 (TH,in −TL,in) 1−2 1− T T3 − 4 H,in L,inPDF Image | Organic Rankine Cycle Solar-Thermal Powerplants
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