An investigation of a hybrid wind-solar integrated energy system with heat and power energy storage system in a near-zero energy building-A dynamic study

Abstract

This work focuses on a dynamic model of an innovative multigenerational solar-wind-based system from energetic, exergetic, economic, and environmental approaches. It is integrated to a near-zero energy building in St. Petersburg of Russia, with the purpose of covering the hourly cooling, heating, and electricity loads of the building. It consists of a wind turbine, a parabolic trough solar loop, an absorption chiller, and a compressed air energy storage system. A gas heater is also used to meet the total heating load of the system at off-peak hours of solar energy and becomes the main source of energy in some months. A comprehensive model is developed and the feasibility of the solar and wind energy is investigated dynamically on the proposed system. Results of the study show that the proposed solar system can cover up to 61 % of the yearly heating loads of the building, and the system. The required heat load of the system itself includes the heat demand of the absorption chiller, and the compressed air storage system. It is also noticeable that the presented energy storage system provides almost 99 % of the required electricity load beside the wind turbine and the rest of it needs the grid connection. In January, 13 % of the electricity demand is supplied from the grid and in the last three months, nearly 69 % of produced power of wind turbine is sold to the grid. This system leads to 13859 kg/year of CO2 emission reduction due to heating, cooling, and electricity. Moreover, the maximum monthly energy and exergy efficiencies are achieved in December with amounts of 41 % and 11 %, respectively. Finally, from the economic analysis, it is found that the positive amount of net present value is accessible after 12, 14, and 17 years, assuming interest rates of 1 %, 3 %, and 5 %, respectively.