thermodynamic and exergoeconomic evaluation of waste heat recovery for hydrogen production in a cchp system

This study presents the energy, exergy, and economic evaluation of recovering energy from a modified kalina powercooling system to provide heating and hydrogen. an orc is employed to use the waste heat of the kalina cycle, and the generated power is transmitted to a pem electrolyzer for hydrogen production. furthermore, the waste heat of the separator outlet is recovered through a new heat exchanger to provide heating. the results show that the proposed system can produce 317 kw power, 714.7 kw cooling, 50.3 kw heating, and 4.491 kg/h hydrogen. moreover, the exergoeconomic analysis indicates that the pem electrolyzer, the cascade heat exchanger, and the vapor generator have the highest cost rate among the system components. additionally, a parametric study was performed on the system to investigate the variation of some key parameters, including the maximum operating pressure, separator ii pressure, ammonia mass fraction in a basic solution, and pinch point temperature difference in the cascade heat exchanger for the thermodynamic and economic performance of the system.