The recent pioneering advancement in the use of nanofluids as the working fluid in the two phase gravity assisted thermosyphon (TPGAT) significantly improved the heat transfer performance. In the present study, the performance enhancement of TPGAT using carbonaceous and metal based nanofluid as the working fluid is investigated. The experiment are conducted at various heat input in the evaporator and at different fill ratios. The results of the experiments revealed that the nanoparticles play a major role in enhancing the performance by bombarding the formation of vapour bubbles in the evaporator section. It is also found that the fill ratio has varying role in the condenser and evaporator section at various heat input of the evaporator section.
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