Absorption　energy　storage　is　highly　effective　in　mitigating　the　intermittence　of　low-grade　energy　but　cannot　achieve　temperature　upgrading,　which　restricts　the　utilization　of　medium-temperature　heat　source.　An　absorption　energy　storage　heat　transformer　(ESHT)　for　energy　storage　and　temperature　lift　capabilities　offers　a　viable　solution　to　this　issue.　To　further　improve　the　temperature　lift,　a　novel　double　absorption　energy　storage　heat　transformer　(DAESHT)　is　proposed.　The　dynamic　characteristics　of　the　operational　process　are　conducted.　Moreover,　the　system　performance　is　analyzed　and　compared　between　the　DAESHT　and　double-stage　energy　storage　heat　transformer　(DESHT)　at　various　charging　and　discharging　temperatures.　Then,　the　effects　of　the　transport　pump　mass　flow　rate　are　extensively　investigated.　Results　show　that　the　DAESHT　can　achieve　comparable　or　superior　performance　to　the　DESHT　with　a　simpler　configuration.　The　maximum　temperature　lift　is　55　°C,　corresponding　to　energy　storage　density,　energy　storage　efficiency,　and　exergy　efficiency　of　19.29　kWh/m3,　0.10,　and　0.19,　respectively.　The　transport　pump　mass　flow　rate　should　be　reduced　as　much　as　possible　while　remaining　close　to　1.5　g/s,　and　the　mass　ratio　of　solution　tank　1　to　solution　tank　2　should　be　set　at　0.7　to　improve　system　performance.　This　study　could　provide　references　for　the　development　of　the　ESHT　systems.　©　2025　Elsevier　Ltd