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Session: Poster session & Sponsor Exhibition
Session starts: Monday 07 October, 14:00

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Stefano Briola (1. Mechanical Engineering, Energy, Power Plants at Università di Pisa)
Seyed Majid Hashemian ()
Seyed Sajad Mousavi ()
Amir Mohammad Haddad Momeni ()
Seyed Masoud Haji Seyedi (Senior Expert in Energy Engineering)

Abstract:
In this paper, an economic optimization of the “Peterson” thermodynamic cycle with a two-phase fluid expander, employed in lieu of a traditional Joule-Thomson (J-T) valve, is performed. A two-phase fluid expander is able to work with chemical species in the wet vapor phase in order to convert its thermodynamic energy in mechanical energy, by means of simultaneous expansion of the two phases. “Peterson” cycle can produce electrical and cooling power by using low temperature heat source. In this paper, some working fluids types (R245fa, Solkatherm SES36, 1234ze and HDR-14) and some two-phase fluid expanders types (scroll, screw and radial) are considered. First, pre-design model of the “Peterson” cycle and process flow diagram was built and simulations ran with different working fluids and two-phase fluid expanders types. In the second step, components and system cost models were built and simulations carried out to evaluate the cost effectiveness of the systems associated with different working fluids and two-phase fluid expanders' types. The operating point for maximum power doesn’t correspond to that of the minimum specific investment cost. The mismatch aforementioned is due to the thermodynamic properties which significantly influence system performance and components sizes. Finally, seeking for profitable environmental solutions, economic optimization has been performed. Keywords: Peterson Cycle, Economic Optimization, Joule-Thomson (J-T) valve