Design optimization of a polygeneration plant fuelled by natural gas and renewable energy sources

A new and systematic procedure to select and size a polygeneration plant fuelled by natural gas, solar energy and gasified biomass is presented in this paper. The proposed procedure is based on the superstructure definition, containing a long list of possible configurations for a polygeneration plant simultaneously producing electricity, heat, cold and fresh water. Based on that superstructure, a mathematical programming model was developed and applied to a Spanish tourist resort. Three key aspects were optimized in the mathematical programming problem: energy savings, greenhouse gases (GHG) emission reduction and economic feasibility. The results show, firstly, that the simultaneous production of electricity, heat, cold and fresh water is reliable upon the established assumptions. Secondly, that today higher economic profitability is yet achieved with only natural gas-based technologies, although higher energy savings and GHG reduction are obtained through the gradual increase of renewable energy sources.

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