CONCLUSIONI Importanza della temperatura di vaporizzazione del fluido influenza

Conclusioni importanza della temperatura di

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CONCLUSIONI Importanza della temperatura di vaporizzazione del fluido – influenza sia sul rendimento termodinamico del ciclo che sull’efficienza di captazione. Condizioni operative che massimizzano la produzione di energia: bassi gradi di concentrazione C =1,75-2,25 (non c’è necessità di riposizionamento stagionale), temperature di vaporizzazione attorno a 120°C. Libertà di scelta fra configurazioni che forniscono la stessa energia annuale ma con diverse distribuzioni mensili. Variazione della temperatura di vaporizzazione in funzione della temperatura ambientale vantaggiosa. Basse temperature del ricevitore consentono una maggiore efficienza di captazione nei mesi invernali. Da approfondire lo studio (stato transitorio, effetto inerzia termica, collettori di tipo asimmetrico, doppio stadio di espansione).
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Esempio applicativo 2 impianto WHR M. Antonelli - Sistemi di trattamento e recupero energetico da biomassa
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62 Analysis of a low concentration solar plant with compound parabolic collectors and a rotary expander for electricity generation 68° Congresso Nazionale ATI – Bologna 11-14 settembre 2013 Introduzione M. Antonelli - Sistemi di trattamento e recupero energetico da biomassa Espansore Wankel Heat source: hot flue gas, ICE exhaust gas, geothermal brine, etc. A design point and a proper working fluid have to be defined. The real operating conditions may be not constant and different from the selected design point.
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The design of a waste heat recovery system needs the definition of a large number of parameters: 63 Thermal power input Heat source temperature Condensing and evaporating temperature Type of the expander ODP and GWP Goal of the system (thermo-economic optimum); Variable working conditions; Systems working out of optimal design conditions. 63 M. Antonelli - Sistemi di trattamento e recupero energetico da biomassa Espansore Wankel
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Highlights of the work Numerical analysis of the dynamic behaviour of a Waste Heat Recovery System Variable flue gas mass flow rate and temperature Small size (10-50 kW el ) Volumetric rotary expander - Wankel scheme - 316 cc displacement Choice of an appropriate fluid; Comparison between superheated and saturated cycle; Comparison of three different control strategies; Start up operation analysis. 64 M. Antonelli - Sistemi di trattamento e recupero energetico da biomassa Espansore Wankel
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Metodology Numerical model of the expansion device Numerical model of the whole recovery system. 65 Static behaviour for fluid selection: Dynamic behaviour: M. Antonelli - Sistemi di trattamento e recupero energetico da biomassa Espansore Wankel
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Three different fluids thermal power range 0-200 kW R600a: dry fluid, Tc = 134.7°C; R245fa: isentropic fluid, Tc = 154.1°C; R152a: wet fluid, Tc = 113.3°C. Maximum saturation temperatures -10-15°C below the critical point to avoid unstable operation; Rotating speed up to 3000 rpm; Cut-off ratio σ = (V 2 -V 1 )/ (V 3 -V 1 ) = 0.2; Fluids superheated up to 200°C.
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