Performance and environmental impact evaluations of a novel multigeneration system with sonic hydrogen production and energy storage options

Abstract

This article designs and develops a unique system integrated with hydrogen production and energy storage effectively to meet the variable energy demands of residential communities by harnessing both solar and geothermal energies. The system features a synergy of technologies, including a steam Rankine cycle, an ammonia-water-based double-effect absorption system, two organic Rankine cycles, a thermal energy storage, battery and hydrogen storage options, and a sonohydrogen production device. In order to develop a new system for producing cooling, electricity, heat and hydrogen, the present study dives deep into an analysis based on energy and exergy approaches using balance equations. The present system has the ability to generate 0.0016 kg/s of hydrogen, creates a net output of 2177 kW, supplies 4337 kW for heating purposes, and offers 903.8 kW of cooling capacity. In addition, the system's performance was rigorously evaluated, revealing an energy efficiency of 83.28 % and an exergy efficiency of 58.71 %, with energetic and exergetic coefficients of performance (COP) of 1.646 and 0.6215, respectively. Additionally, an environmental impact assessment was conducted, focusing on CO2 emissions to gauge the system's sustainability. This assessment further indicates that the system could potentially avoid the release of 3.351 kg of carbon dioxide per kilowatt-hour into the atmosphere which might have come from conventional systems.