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Thermo-economic optimization of a real polygenerative district.

Author(s) : BARBERIS S., RIVAROLO M., TRAVERSO A., et al.

Type of article: Article

Summary

This paper presents a real smart polygenerative grid, designed to satisfy energy demands of the University of Genoa, Campus of Savona (Italy). The plant is made up by different generators: conventional boilers, combined heat and power (CHP) units, electrical and thermal storages and renewable generators. The analysis of this polygenerative smart-grid is performed exploiting a software developed by the Authors' research group, which allows for the time-dependent multi level thermo-economic optimization of polygenerative energy systems. In the models the experimental off-design curves of the real devices installed were used in order to increase the reliability of the simulation results and to allow model validation to be easily obtained. The grid was simulated considering the time dependent nature of the demands throughout the whole year, finding best thermo-economic operational strategy. Finally, attention is devoted to future lay-out modifications in order to reduce purchased electricity from the National grid in summer months, when, as the thermal request decreases, the CHP units are not currently properly exploited. Two different solutions are analyzed coupling the micro-gas turbine (mGT) CHP units with absorption chillers or with a small size organic Rankine cycle (ORC) turbine, and their thermo-economic performances are discussed in depth.

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