Design a novel solar based system integrated with humidification-dehumidification unit and re-compression sCO2 cycle for sustainable development

Abstract

This paper discusses thermodynamic modeling of a power generation cycle, cooling, and freshwater with the employment of solar energy. The introduced system has different subsystems; solar dish collector, a re-compression sCO2 Brayton cycle integrated with a combined Rankine power-ejector refrigeration system and humidification and dehumidification desalination unit driven with a solar dish system. The considered system is analyzed in the context of thermodynamics index and criteria such as irreversibility, freshwater production, energy and exergy efficiencies, and environmental metric. The performance-affecting primary variables are determined through a parametric evaluation of the suggested system. According to the results, the system is capable of producing 83.3 kW of electrical power at the design point and 3.1 kW of cooling as well as 41.54 kg/h of freshwater. A more accurate analysis of exergy destruction shows that solar dish and heat exchanger-4 have the most significant rate of exergy destruction. In addition, parameters such as solar radiation intensity, compressor pressure ratio, and entrainment ratio are parametrically analyzed. The results indicated that increasing entrainment ratio from 0.3 to 0.6, will increase the refrigeration capacity from 2.33 kW to 4.66 kW and the operation of Turbine 2 from 15.96 kW to 18.63 kW. Also, enhancing the solar radiation intensity from 650 W/m2 to 950 W/m2 has different influences the system outputs so that increasing the solar intensity will reduce the performance of the cooling cycle and increase the freshwater produced.