NOVELTY - The enhanced thermal management system has fuel cell (1) which is provided with cooling loops (10,11) for exchanging the heat generated in fuel cell. The secondary cooling loop (11) is formed to circulate secondary coolant (9) from secondary coolant reserve tank (6) through flow controller (7) into plate heat exchanger (2) and radiator fan assembly (5) and back to secondary coolant reserve tank. The primary coolant is provided a water and secondary coolant is provided as (GN)-nanofluid.    USE - Enhanced thermal management system for fuel cell, used in vehicle such as car and bus.    ADVANTAGE - The operational duration of the fuel cell at optimal operating conditions is increased. The thermal property of the thermal management system is ensured. The weight of the fuel cell is reduced. The compact and mobile type of the fuel cell is ensured. The fuel cell is cooled efficiently by eliminating the open loop way of cooling and coolant flow.    DETAILED DESCRIPTION - The primary cooling loop (10) is formed to circulate the primary coolant (8) drawn from reserve tank (3) controlled by flow controller (4) into plate heat exchanger and feedback into reserve tank. The water is circulated as primary coolant through primary cooling circuit, and is drawn from reserve tank through the fuel cell to plate heat exchanger and back into reserve tank. The reserve quantity of primary coolant is retained. The inlet temperature, outlet temperature and flow rate of primary coolant is measured to the fuel cell. The primary coolant is cooled across the heat exchanger. The secondary cooling circuit is provided with (GN)-nanofluid as secondary coolant flowing through entire secondary cooling circuit to plate heat exchanger positioned between primary and secondary loops so as to enabled heat exchange to take place between primary and secondary coolants across exchanger. The radiator fan assembly is provided to perform heat exchange between secondary coolant and ambient air in radiator fan assembly through convective heat transfer. The secondary coolant (GN)-nanofluid is made from thermally exfoliated wrinkled graphene (TEWG). The required quaintly of graphite (2 gms) is reacted with concentrated sulfuric acid (46 ml) in container maintained in ice bath or maintained at temperature of (0 degrees C) with continuous stirring process. The sodium nitrate (1 gm) and potassium permanganate (6 gms) are added gradually in above mixture. The ice bath is removed and slowly bringing down the temperature of suspension to ambient temperature. The water (92 ml) is added into resultant mixture in which temperature suddenly rises to around 98 degrees C. The dilution of mixture is performed by addition of adequate quantity of warm water (280 ml) after 15 min. 3 % of hydrogen peroxide solution is turned into bright yellow. The suspension and washing is performed repeatedly with filter cake with warm water. The suspension of above filter cake is prepared using water while centrifuging the resulting suspension. The final product is dried under vacuum at 50 degrees C and stored in vacuum desiccators. The dried graphene oxide is sprinkled on quartz boat and stored inside thepreheated furnace at 1050 degrees C for 30 seconds in argon atmosphere causing increase in temperature (~2000 degrees C/minute) resulting in exfoliation of graphene oxide to graphene nanosheets. The ultrasonication of resultant GN in acid medium is performed with hydrogen sulfuric acid, nitric acid (3:l) for 3 hours. 2.5 kW of electrical power is maintained at stack temperature between 45 degrees C-50 degrees C for 60 minutes and more.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the loop cooling system.    Fuel cell (1)    Plate heat exchanger (2)    Reserve tank (3)    Flow controllers (4,7)    Radiator fan assembly (5)    Secondary coolant reserve tank (6)    Primary coolant (8)    Secondary coolant (9)    Primary cooling loop (10)    Secondary cooling loop (11)