This　study　focuses　on　waste　heat　recovery,　renewable　energy　storage,　and　cascade　energy　utilization　by　proposing　a　polygeneration　system　that　integrates　a　Carnot　battery,　an　absorption　refrigeration　cycle,　and　multi-stage　flash　desalination.　This　system　is　engineered　to　provide　cooling,　heating,　electricity,　and　freshwater.　It　utilizes　a　dual-pressure　condensation　heat　pump　to　facilitate　energy　output　across　different　stages,　with　the　low-temperature　condenser　connected　to　the　absorption　refrigeration　cycle,　while　one　side　of　the　high-temperature　condenser　acts　as　thermal　energy　storage.　The　provision　of　freshwater　and　domestic　hot　water　primarily　relies　on　excess　heat　from　the　absorption　refrigeration　cycle.　In　this　research,　the　optimal　working　fluid　for　the　Carnot　battery　was　identified.　Subsequently,　the　study　analyzed　the　impact　of　several　operating　parameters　on　the　system＇s　thermodynamic　performance　and　economy,　including　the　outlet　water　temperature　of　the　low-temperature　condenser,　the　degree　of　superheat　of　the　working　fluid　in　the　heat　pump　evaporator,　the　temperature　of　the　storage　tank,　the　isentropic　efficiency　of　the　compressor,　and　the　mass　flow　rate　ratio　of　the　working　fluid　in　the　low/high-temperature　condensers.　Among　them,　the　mass　flow　rate　ratio　of　the　working　fluid　in　the　low/high-temperature　condensers　has　the　most　significant　impact　on　the　system,　and　the　overall　energy　efficiency　and　payback　period　of　the　system　increase　by　138.51　%　and　174.58　%,　respectively.　A　multi-objective　optimization　of　the　system　was　performed　using　the　Non-dominated　Sorting　Genetic　Algorithm　II　to　identify　the　optimal　design　parameters　for　the　integrated　generation　system.　The　optimized　system　achieved　total　energy　efficiency,　exergy　efficiency,　and　payback　period　of　23.26　%,　12.56　%,　and　4.96　years,　respectively.　©　2025　Elsevier　Ltd