Yazar "Hemachandu, P." seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • Küçük Resim Yok
    Öğe
    Influences of various metal oxide-based nanosized particles-added algae biodiesel on engine characteristics
    (Pergamon-Elsevier Science Ltd, 2023) Jegan, C. Dhayananth; Selvakumaran, T.; Karthe, M.; Hemachandu, P.; Gopinathan, R.; Sathish, T.; Agbulut, Umit
    Nano fuel technology is widely used to enhance fuel capability to improve combustion, performance and emission behaviors of the engines. On the other hand, biodiesel is the best alternative to the conventional fossil fuels. However, it may worsen the engine characteristics, and should be modified. In this framework, this investigation aims to improve algae oil biodiesel by employing nano fuel technology by mixing metallic oxide nanoparticles like CeO2, SiO2 and TiO2 with a concentration of 150 mg/lit. The base fuel B25 blends consist of Algae oil-based biodiesel 25 vol% and 75 vol% of diesel. The B25 blends and 150 mg/lit concentration of nanoparticles were preferred through basic experimentation. An ultrasonicator was employed in the preparation of nano fuels such as B25CeO2, B25SiO2, and B25TiO2. The prepared Nano fuels were characterized and tested in a diesel engine at varying engine speeds ranging from 1250 rpm to 2500 rpm with the step of 250 rpm. The results revealed that the use of B25TiO2 recorded the maximum engine cylinder pressure at 72.2 bar was recorded at the 5O crank angle and maximum heat release rate of 63.2 J/OCA. The maximum speed of the engine leads to higher BTE. In comparison to that of conventional diesel fuel, the use of the B25+TiO2 blend increased in-cylinder pressure by 23.4%, heat release rate by 16.6%, BTE by 32.4%, CO2 by 65.09%, and decreased BSFC by 25.62%, CO by 33.4%, NOx by 68.3%, UHC by 22.75%, and smoke opacity by 30.99%. Hence, this investigation found a novel blend of B25TiO2 for lowering emissions and improving diesel engine performance.
  • Küçük Resim Yok
    Öğe
    PCM embedded square channel receiver for effective operation of Net Zero Emission/Energy PDC building heating system
    (Elsevier, 2023) Sathish, T.; Saravanan, R.; Jeyanthi, C. Esther; Sabariraj, R. V.; Hemachandu, P.; Agbulut, Umit; Saleel, C. Ahamed
    Net Zero Emission / Energy recommends reducing energy consumption to zero (use of renewable sources) and ensuring no pollution and emissions. Parabolic Dish Collector (PDC) is such a device, which utilizes the Solar energy (Zero Cost of Energy) for heating (Zero Emission of Carbon gases) by converting solar energy into heat transfer fluids (HTF). The recent researches PDC receiver's efficiency improvement by different designs or arrangement inside the receiver as well as different types of phase change materials (PCMs) incorporated to it. This investigation aims to improve the PDC by involving the square channel type solar receiver as an alternate receiver and embedding it with the PCM for building heating applications. The thermal performance of 14 m2 square-channeled PDC was investigated with and without PCM embedded conditions. For embedding PCM of Paraffin wax, 3 kg was used in thermal storage in this experiment. The square-channeled receiver recorded the lowest receiver surface temperature and the highest discharge water temperature. Black coating is employed to reduce the heat loss from the receiver substance.The average energy and exergy efficiencies are around 65.8 % and 6.8 %, respectively, at a flow velocity of 0.07 kg/s. As PCM maintains a constant temperature, the solar receiver can hold its internal temperature around triple times higher than the conventional PDC (without PCM case). Hence it was experimentally ensured that PCM-filled PDC (solar receivers) is suitable for heating applications in domestic and industrial buildings.