K L University

Currently world is encountering crisis such as diminution of fossil fuel resources and global warming due to engine emissions.Changing operating parameters of engine is one of feasible technique to enhance engine performance.The present exptl. work is mainly focuses on influence of changing compression ratio along with diff. EGR rates for research diesel engine fueled with 20% mango seed Me ester (MSME 20).Transesterification process was used to reduce viscosity of mango seed Me ester.As per ASTM standards, fuel properties of MSME and MSME20 were evaluated and compared with diesel.Initially, compression ratio was varied at three levels such as 18:1, 20:1, and 22:1 for diesel engine powered with 20% mango seed biodiesel blend and compared with diesel.Based on experimentation, it was found that MSME20 blend with compression ratio of 22:1 was shown enhanced brake thermal efficiency by 7.4% and also reduction in engine emissions such as carbon monoxide, hydrocarbon and smoke opacity by 33.3%, 40%, and 7.1% were found at full load resp. when compared to MSME20 with compression ratio of 18:1.In order to mitigate NO_X emissions,engine is further operated with diff. EGR rates (5% and 10%) at compression ratio of 22:1.The test results evident that addition of 5% of EGR to engine running at compression ratio 22:1 reduced NO_X emission levels by 40.5% over standard conditions without much penalty in engine performance.

The current research work concentrates on the potentiality of waste plastic oil (WPO) as a viable source.Waste plastic oil is obtained by using the pyrolysis technique.The different fuel properties are determined and contrasted with diesel.Initially, different blends of waste plastic biodiesel blends (WPO10, WPO20 and WPO30) were tested on diesel engines at ideal conditions.From test results, the optimized WPO20 blend is further investigated with the addition of copper oxide (CuO) nanoparticles at two levels, 30 and 60 ppm, by using an ultrasonication process.Test results inferred that BTE for the WPO20 CuO 30 ppm is enhanced by 3.23% over WPO20.Furthermore, the harmful emissions of CO, HC and smoke are reduced drastically by 27.95%,11.11% and 5.7%, resp. over diesel.Overall, the use of WPO20 CuO nanoparticles shows pos. attributes of diesel engines.

The present study investigates the performance of a solar aluminum can air heater (SCAH) both with and without latent heat storage (LHS).The exptl. setup involved fabricating a solar air heater using recyclable aluminum cans and integrating latent thermal heat storage (LTHS) with paraffin wax as the phase-changing material.Experiments were conducted with three distinct mass flow rates: 0.015 kg s^-1, 0.022 kg s^-1, and 0.036 kg s^-1.The research was carried out in Tadepalle, Andhra Pradesh (16.4799° N, 80.6175° E), on clear days in March and Apr. of 2023.Comparative anal. reveals that the SCAH incorporating LTHS demonstrates higher efficiency and exits air temperatures compared to the SCAH without a thermal storage system.As the mass flow rate increases, the efficiency gap between SCAH with and without PCM reduces.Among the three trials, the SCAH with PCM exhibited the maximum efficiency at a mass flow rate of 0.036 kg s^-1.