Optimization and dynamic techno-economic assessment of integrated combined ejector cooling, heating, and power system

Abstract

Solar energy systems have been extensively studied for their potential to reduce greenhouse gas emissions and their economic feasibility in buildings. However, due to the high initial cost, the implementation of these systems has been limited. This study proposes an innovative energy system, incorporating Photovoltaic Thermal (PVT) technology without batteries and heaters, and ejector cooling for smart buildings that can interact with the power grid. The proposed system aims to offset the energy costs of buildings by selling excess electricity to the grid. Both thermodynamic and economic analyses were conducted using TRNSYS software, and optimization was applied to meet maximum exergy efficiency and minimum cost objectives. Results indicate that the maximum annual exergy efficiency of the system can reach 21.98%, while the minimum total production cost unit is $22.48/MWh. Operating conditions yield an annual exergy efficiency of 14.18%, with a total production cost unit of $34.01/MWh. Overall, findings demonstrate that this proposed system can efficiently provide electricity to the building while offering surplus energy for sale to the grid.