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1 . Qin . W net 4 2 TH TL Figure 2.5 – Schematic of a trilateral flash cycle Using Figure 2.5, the cycle efficiency can be evaluated. For the sake of simplification, the work of the pump is neglected and thus, the efficiency of the trilateral cycle derived from equation 2.1 becomes (Bryson, 2007): .. ηTR = Wnet =1- Qout TH -TL (2.4) With Qin = 2 [TH (s2 -s3 )-TL (s2 -s3 )]+TL (s2 -s3 ) and Qout =TL (s2 -s3 ) . TH and TL represent the absolute temperature of the heat source and that of the cold sink, respectively. It is obvious from equations 2.2 and 2.4 that the efficiency of a trilateral cycle is lower compared to that of a Carnot cycle. The possibility of using the trilateral cycle for power generation is being investigated. Recently, Zamfirescu and Dincer (2008), proposed an ammonia-water trilateral Rankine cycle for power generation. Their cycle uses no boiler and the saturated liquid at the pump exit is flashed by a positive displacement expander (e.g. reciprocating, centrifugal, rotating vane, and screw or scroll type expander). The proposed cycle showed good performance in comparison with Rankine and Kalina cycles. A series of research focusing the power generation using two-phase expanders in trilateral flash cycles (TFC) and the replacement of throttle valves in large vapor compression systems were carried out at City University, United Kingdom, by Smith et al., (2001a; 2001b; 2005), where they built and tested screw machines which can work in two-phase flows with satisfactory performance of 70% in expansion mode and 80% in compression mode. th . . Qin Qin TH TL .1. 3 . Qout Entropy Page | 40 TemperaturePDF Image | Low-Grade Heat Conversion into Power Using Small Scale Organic Rankine Cycles
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