Thermal analysis of modified solar-driven dual-evaporation Kalina system

•The concept of dual-evaporation pressure has been adopted into a Kalina cogeneration.•The spiral baffle is inserted in the temperature difference thermal storage tank.•The thermal efficiency is found to be 32.66%, and the exergy efficiency is 74.49%.•The collector efficiency of parabolic trough solar collector could be up to 64.7%.•The solar-power efficiency of whole system could be up to 19.9%.