Proposing a new method for waste heat recovery from the internal combustion engine for the double-effect direct-fired absorption chiller

•Introducing a new waste heat recovery system for use in the direct-fired absorption chiller cycle.•Designing a new generator for direct-fired absorption chiller.•Using the high-temperature water for heat transfer in new generator.•Saving the natural gas consumption of by an average of 90 m3/h.•Reducing NOX and CO2 emissions to 15216.79 and 2492251.2 ton/year by using the proposed system.