Showing papers on "Thermal efficiency published in 2021"
TL;DR: In this article, the preparation methods and physicochemical properties of biodiesel-based fuels containing Cerium Oxide (CeO2) nanoparticles were fully introduced, and the effects of CeO2 on the atomization and micro-explosion of as-used fuels were also discussed in detail.
157 citations
TL;DR: In this paper, the potential of fuel candidates to increase efficiency in spark-ignition (SI) engines is quantified in a way that allows the individual fuel properties to be traded off for one another.
109 citations
TL;DR: In this article, the progress of ammonia combustion technologies in spark ignition engines, compression ignition engine, and gas turbine was reviewed, and the results showed that aqueous ammonia elevates heat release rate of full load compression ignition engines by almost 10%.
100 citations
TL;DR: In this paper, the influence of fuel borne additive on ternary fuel blend operated in a single cylinder DI diesel engine is investigated. And it is concluded that addition of 20ppm alumina nano additive in TF can enhance the engine performance and combustion as well as lower the exhaust pollutants simultaneously.
95 citations
TL;DR: In this paper, a vertical hybrid PVT solar dryer has been developed and analyzed by utilizing numerical and experimental approaches, and the obtained experimental findings showed that thermal efficiency values of the finless and finned vertical PVT collectors were in the ranges of 47.46-54.86% and 50.25-58.16%, respectively.
81 citations
TL;DR: In this paper, the authors focused on the investigation of various photovoltaic thermal (PVT) solar collector designs incorporating phase change materials as suitable material for thermal management and revealed the importance of a PVT-PCM collector design concerning the overall efficiency improvement of systems.
67 citations
TL;DR: In this paper, machine learning algorithms (MLAs) are used to predict emission and performance characteristics of a CI engine fuelled with various metaloxide based nanoparticles (Al2O3, CuO, and TiO2) at a mass fractions of 200 ppm.
66 citations
TL;DR: In this paper, the authors explored the impacts of titanium dioxide (TiO2) nanoparticles along with the water-in-diesel (DWS) emulsion fuel on the engine attributes, emission and combustion of a single cylinder diesel engine.
64 citations
B.V.B. College of Engineering and Technology1, University of Malaya2, King Khalid University3, Center for Advanced Materials4, King Abdulaziz University5, SDM College of Engineering and Technology6, Virginia Tech College of Natural Resources and Environment7, China Medical University (Taiwan)8, Techno India9
TL;DR: In this article, the performance and emission characteristics of a dual-fuel diesel/Honge Oil Methyl Ester (HOME)-PG operated CI engine has been studied and the injector nozzles with 4, 5, and 6 holes (diameter of 02, 025, and 03 mm) were analyzed.
Abstract: The improvement in performance has been observed by changing the injector nozzle's geometry of the dual-fuel liquid–gas engine The combined effect of injector parameters and producer gas (PG) derived from the redgram stalk on the performance and emission characteristics of a dual-fuel diesel/Honge Oil Methyl Ester (HOME)-PG operated CI engine has been studied The injector nozzles with 4, 5, and 6 holes (diameter of 02, 025, and 03 mm) were analyzed Diesel-PG operation with 4 holes, 025 mm diameter nozzle and HOME-PG operation with 6 holes, 025 mm diameter nozzle resulted in better performance and lower emissions Diesel-PG operation has 45% higher BTE (brake thermal efficiency) with a 4 hole nozzle and 07% higher for a 025 mm diameter 6 holes nozzle than HOME-PG operation The HOME-PG operation results showed that the with an injection opening pressure of 240 bar, 6-hole nozzle, and a diameter of 025 mm have an improved BTE of 58% with emission levels 15–30% lower than those of other geometries
64 citations
TL;DR: In this paper, a one-cylinder, four-stroke and spark ignition engine was used to study and analyze the effect of ethanol's/gasoline blend on power, efficiency and exhaust gases.
63 citations
TL;DR: In this paper, the authors make an attempt to add aluminium oxide (AL2O3) nanoparticles (25, 100ppm) into diesel-methanol blends, and to study the impact of the nanoparticle additive on the characteristics of a modern DI diesel engine.
TL;DR: In this article, a constructal thermodynamic optimization (CTO) based on a combination of constructal theory and finite-time thermodynamics is proposed for the dual-pressure organic Rankine cycle (DPORC) to solve energy problems.
TL;DR: In this article, a tree-shaped fin inspired by nature is employed for the thermal enhancement of vertical LHS units, and a three-dimensional mathematical model using the enthalpy-porosity method is developed to comprehensively evaluate the heat charging/discharging process of the new and traditional latent heat storage units, focusing on the role of heat transfer fluid (HTF) direction.
TL;DR: In this article, the performance, combustion and emission characteristics of a single-cylinder four-stroke, direct injection diesel engine fueled with fish oil biodiesel and waste palm cooking oils biodiesel via.
Ton Duc Thang University1, University of Engineering and Technology, Lahore2, University of Malaya3, Kyungpook National University4, P A College of Engineering5, King Khalid University6, Center for Advanced Materials7, Jiangsu University8, Banha University9, King Abdulaziz University10, Menoufia University11, Taif University12
TL;DR: In this article, the authors evaluated the emission and performance characteristics of a CI engine using biodiesel blends with three different nanoparticles, including CNT, TiO2 and Al2O3 nanoparticles.
TL;DR: In this paper, the optimum production yield of Food Industrial Waste Oil Methyl Ester (FIWOME, B100, FIWOB) was modelled using Response Surface Methodology (RSM) and Artificial Neural Network (ANN) techniques.
TL;DR: In this paper, Prandtl-Eyring hybrid nanofluid (P-EHNF) was chosen as a working fluid in the SWP model for the production of SWP in a parabolic trough surface collector (PTSC).
Abstract: Nowadays, with the advantages of nanotechnology and solar radiation, the research of Solar Water Pump (SWP) production has become a trend. In this article, Prandtl-Eyring hybrid nanofluid (P-EHNF) is chosen as a working fluid in the SWP model for the production of SWP in a parabolic trough surface collector (PTSC) is investigated for the case of numerous viscous dissipation, heat radiations, heat source, and the entropy generation analysis. By using a well-established numerical scheme the group of equations in terms of energy and momentum have been handled that is called the Keller-box method. The velocity, temperature, and shear stress are briefly explained and displayed in tables and figures. Nusselt number and surface drag coefficient are also being taken into reflection for illustrating the numerical results. The first finding is the improvement in SWP production is generated by amplification in thermal radiation and thermal conductivity variables. A single nanofluid and hybrid nanofluid is very crucial to provide us the efficient heat energy sources. Further, the thermal efficiency of MoS2-Cu/EO than Cu-EO is between 3.3 and 4.4% The second finding is the addition of entropy is due to the increasing level of radiative flow, nanoparticles size, and Prandtl-Eyring variable.
TL;DR: In this paper, the advantages of the ORC were used to improve overall performance of a simple gas turbine (GT) located in a wood production facility, where a steam boiler was also coupled with the GT to increase overall performance and to produce needed steam.
TL;DR: The applied soft computing combination appears to be a promising approach to model and optimize operating parameters and fuel composition of diesel engines.
TL;DR: In this paper, the effect of nanofluids on a photovolatic thermal solar system experimentally was investigated, which showed that the addition of nanoparticles showed profound results in electrical output, thermal efficiency and overall efficiency.
TL;DR: In this article, the Silkworm Oil Methyl Ester (SWOME) has been prepared by a two-step transesterification process and the catalyst used is Sulphuric acid (H2SO4) for esterification and Sodium hydroxide (NaOH) for the second step process.
TL;DR: In this paper, a phase change composite with expanded graphite and thermoplastic elastomer is used to mix with the powders with twin-screw extrusion technology for storing solar thermal energy with large enthalpy and high exergy.
TL;DR: In this paper, the optimal design and operation of an organic rankine cycle (ORC) system driven by solar energy is investigated, where a two-tank sensible thermal energy storage system is configured to overcome the intermittency of solar energy.
TL;DR: In this article, an ammonia/diesel dual-fuel (ADDF) engine is experimentally and numerically investigated, with focus on its feasibility to reduce GHG emissions while achieving a diesel-like efficiency.
TL;DR: In this article, the performance and characteristics of a compression ignition engine on methanol/diesel blends and the impact of engine loads on tailpipe emissions and engine performance were investigated and analyzed.
TL;DR: In this paper, the effect of helically coiled evacuated tube on the outlet temperature, heat gain, thermal efficiency and pressure losses, has been studied under the normal and reversed system operation.
TL;DR: In this paper, the impact of using hydrogen as a supplementary fuel for spark ignition (SI) and compression ignition (CI) engines on engine performance and gas emissions was investigated, and it was shown that using hydrogen will reduce the emissions of CO, UHC, CO2, and soot; however, NOx emission is expected to increase.
Abstract: The demand for fossil fuels is increasing because of globalization and rising energy demands. As a result, many nations are exploring alternative energy sources, and hydrogen is an efficient and practical alternative fuel. In the transportation industry, the development of hydrogen-powered cars aims to maximize fuel efficiency and significantly reduce exhaust gas emission and concentration. The impact of using hydrogen as a supplementary fuel for spark ignition (SI) and compression ignition (CI) engines on engine performance and gas emissions was investigated in this study. By adding hydrogen as a fuel in internal combustion engines, the torque, power, and brake thermal efficiency of the engines decrease, while their brake-specific fuel consumption increase. This study suggests that using hydrogen will reduce the emissions of CO, UHC, CO2, and soot; however, NOx emission is expected to increase. Due to the reduction of environmental pollutants for most engines and the related environmental benefits, hydrogen fuel is a clean and sustainable energy source, and its use should be expanded.
TL;DR: In this paper, probable single, dual and triple power system configurations were assessed in terms of energy, exergy and environment, and it was concluded that 46.39% of total heat input could be recovered by the triple GT-RC-KC.
01 May 2021
TL;DR: In this article, the authors reviewed and summarized the recent implementations carried out on utilizing nanofluids in different types of heat exchangers, including plate heat exchanger, double-pipe heat exchange, shell and tube heat exchange and cross-flow heat exchange.
Abstract: Heat exchangers are widely utilized in different thermal systems for diverse industrial aspects. The selection of HEx depends on the thermal efficiency, operating load, size, flexibility in operation, compatibility with working fluids, better temperature and flow controls, and comparatively low capital and maintenance costs. Heat transfer intensification of heat exchangers can be fulfilled using passive, active, or combined approaches. Utilizing nanofluids as working fluids for heat exchangers have evolved recently. The performance of heat exchangers employed different nanofluids depends mainly on the characteristics and improvement of thermophysical properties. Regarding the unique behavior of different nanofluids, researchers have attended noteworthy progress. The current study reviews and summarizes the recent implementations carried out on utilizing nanofluids in different types of heat exchangers, including plate heat exchangers, double-pipe heat exchangers, shell and tube heat exchangers, and cross-flow heat exchangers. The results showed that nanofluids with enhanced thermal conductivity, although accompanied by a considerable decrease in the heat capacity and raising viscosity, has resulted in performance enhancement of different heat exchangers types. So, the performance evaluation criterion that combines the thermal enhancement and increases the pumping power for any type of heat exchangers is requisite to evaluate the overall performance properly. The challenges and opportunities for future work of heat transfer and fluid flow for different types of heat exchangers utilizing nanofluids are discussed and presented.
TL;DR: In this paper, the authors evaluated the effect of the simultaneous use of thermoelectric cooling and heating application with various nanofluids on the performance of solar still and showed that the water productivity, thermal efficiency, and CO 2 mitigation of the solar still improved with increasing the concentration of the nanoparticles in the base fluid.