Dynamic simulation and 3E optimization with an environmental assessment of an efficient energy plant for generation of fresh water by humidification-dehumidification technology and green power and H₂

Buildings, mainly residential complexes, can benefit significantly from integrated district generating systems because of their flexibility, increased energy efficiency, and reduced emissions. The energy requirements of a building in Beijing, China, are investigated in this work using dynamic modeling software. The use of solar energy, including photovoltaic thermal panels and collectors, desalination systems, which include humidification and dehumidification units, and hydrogen generation systems, which include alkaline and proton exchange membrane electrolyzer, as well as heating and cooling systems, is suggested and examined transiently. The TRNSYS software works by simulating a situation from a thermodynamic and environmental point of view. According to the findings, we receive solar radiation on our solar panels for more than half the year, with a maximum output of 16.2 kWh. Additionally, it was found that more hydrogen and freshwater were produced during the year's warmer seasons, with the maximum hydrogen production rate reaching 2 kg per hour. The hydrogen tank, therefore, had a higher state of charge during the hotter months. The power and heating produced were also calculated on the hottest and coldest days of the year. The findings showed that power generation is roughly-four times higher on the year's hottest day than the coldest. Furthermore, since freshwater and hydrogen production rates rise during hot weather, the overall efficiency is higher during warm months. After optimization was completed, the best-case scenario saw 0.7 kg of hydrogen produced for 17.45 $/GJ. Environmentally, using solar energy can be reduced CO₂ emissions compared with fossil fuels.