A cost-effective vacuum dryer system operatable at low temperatures and ensures texture and consistency of heat-labile materials. The vacuum dryer system of the current invention comprises of an (i) liquid stored bottom tank (ii) a vertical tower with a closed top end and an open bottom end connected with each other through the sidewalls providing internal space for mixing and heat exchange of different temperature liquids; having three separate inlets for entry of a hot liquid, entry of a cold liquid and for air suction respectively; and having its bottom end dipped down in the liquid stored in said bottom tank, wherein the vacuum drying is achieved by connecting the wet object with the air suction inlet while allowing simultaneous entry and mixing of different temperature liquids inside said vertical tower through other inlets.