Suitable only for systems whose variation over time is limited For systems

Suitable only for systems whose variation over time

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Suitable only for systems whose variation over time is limited For systems whose optimal set point can be established a priori For system characterized by strong load variations Comparison of strategies 15 759 75 75 M. Antonelli - Sistemi di trattamento e recupero energetico da biomassa Espansore Wankel
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Comparison of rotational speed (strategy II and III) At low saturation temperatures the expander reached the maximum allowed speed: saturation temperature was not kept to the set point value; With control strategy III fluctuations of speed were lower than with strategy II. 16 15 769 76 76 M. Antonelli - Sistemi di trattamento e recupero energetico da biomassa Espansore Wankel
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Using control strategy III the set point varied over time and the saturation temperature driven by the expander rotational speed was able to follow set point variations. load cycle 1 load cycle 2 77 SATURATION TEMPERATURE 15 779 77 77 M. Antonelli - Sistemi di trattamento e recupero energetico da biomassa Espansore Wankel
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Start-up processes Thermal power raised up from 0 up to the maximum in 20 s. 78 Lower T sat Equilibrium Time Delivered Power Higher T sat Equilibrium Time Delivered Power Control strategy III Equilibrium Time Delivered Power 15 789 78 78 M. Antonelli - Sistemi di trattamento e recupero energetico da biomassa Espansore Wankel
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Conclusions Waste heat recovery ORC cycle with a Wankel expander; Working fluid selection through static analyses of the expansion device; R-600a provided the highest mechanical power. Two different load cycles were tested; Superheated vs saturated cycles: saturated cycles provided the highest overall efficiency; Three different control strategies: 1) constant speed; 2)constant saturation pressure; 3) variable saturation temperature and speed. Strategy n. 3 always provided the same efficiency than strategy n. 2 but no need for optimal parameters set-up; Improved start-up time and delivered power at steady state. 19 15 79 79 79 M. Antonelli - Sistemi di trattamento e recupero energetico da biomassa Espansore Wankel
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