Seasonal assessment of a hybrid CCHP-photovoltaic system coupled with CAES for a residential building in Rio de Janeiro: Energetic, exergetic, exergoeconomic and environmental analysis

Abstract

Addressing the issues of energy transition requires good practices for better energy management and increase of efficiency, alongside a widespread utilization of renewable energy sources and energy storage, optimized to the consumers’ demands. In this context, a numerical simulation is developed to investigates a trigeneration (electricity, heating, and cooling) scenario applied to a typical on-grid residential building in Rio de Janeiro, Brazil. The studied configuration for the hybrid combined cooling, heat, and power system is mainly composed of photovoltaic panels; a small-scale compressed air storage system with compressors and turbines with intercoolers and preheaters and two air storage tanks; and water tanks functioning as thermal energy storages. The system undergoes an evaluation through an energetic, exergetic, exergoeconomic and environmental (4E) analysis in a quasi-steady state regime. The yearly investigation allows to assess the seasonality effect on the system, and its impacts of different parameters. The results indicate that the proposed system can sustain 94.3 % of the building electric demand. Considering one year of operation, the system has an electric, cogeneration and trigeneration efficiencies of 37.6 %, 41.1 % and 44.3 %, respectively Regarding the exergy performance, the charging process is responsible for most of the exergy destruction of the system due to the low exergy efficiency of the photovoltaic panels. The discharge operation registered a low exergoeconomic factor compared to the charging one. The system operation was able to abate 20.34 tCO_2eq emissions.