Multiobjective Synthesis of a Polygeneration System for a Residential Building Integrating Renewable Energy and Electrical and Thermal Energy Storage
Abstract
The residential sector plays an important role in the action to combat climate change and its impacts. Recent studies show that the integration of thermal and electrical systems allows to increase the share of renewable energy, and the reduction of CO2 emissions. Polygeneration systems lead to a reduction of economic costs and CO2 emissions with respect to the separate production of energy services, thanks to an adequate systems integration. Achieving such benefits requires an appropiate design procedure bearing in mind that the minimization of the economic costs is often opposite to the minimization of the environmental impact. The aim of this paper is to carry out the synthesis of a polygeneration system for a residential building located in Zaragoza (Spain) encompassing renewable energy, thermal energy storage and batteries, considering economic and environmental aspects. A mixed integer linear programming (MILP) model has been developed to obtain trade-off solutions through the multiobjective optimization in two cases: grid connected and standalone systems. In both cases, five configurations of commercially available equipment were obtained, finding interesting solutions where significant CO2 emissions reduction were achieved with a small increasing in the economic cost.