Multi-objective optimization of a biomass gasification to generate electricity and desalinated water using Grey Wolf Optimizer and artificial neural network

Multi-objective optimization of a biomass gasification to generate electricity and desalinated water using Grey Wolf Optimizer and artificial neural network.

https://profdoc.um.ac.ir/articles/a/1082109.pdf

Design and multi-criteria optimisation of a trigeneration district energy system based on gas turbine, Kalina, and ejector cycles: Exergoeconomic and exergoenvironmental evaluation

Integration of biomass gasification with a supercritical CO2 and Kalina cycles in a combined heating and power system: A thermodynamic and exergoeconomic analysis

This work studies the effect of the tool tilt angle on the generated heat and the material flow in the work pieces joint by Friction Stir Welding (FSW). An apropos kinematic framework together with a two-stage speed-up strategy is adopted to simulate the FSW problem. The effect of tilt angle on the FSWelds is modeled through the contact condition by modifying an enhanced friction model. A rotated friction shear stress is proposed, the angle of rotation depending on the process parameters and the tilt angle. The proposed rotation angle is calibrated by the experimental data provided for a tilt angle 2.5°. The differences of generated heat and material flow for the cases of tool with tilt angle of 0° and 2.5° are discussed. It is concluded that due to the higher temperature, softer material and greater frictional force in the trailing side of the tool, the material flow in the rear side of the FSW tool with the title angle is considerably enhanced, which assists to prevent the generation of defect.

Effect of the Tool Tilt Angle on the Heat Generation and the Material Flow in Friction Stir Welding

Proposal and assessment of a novel combined heat and power system: Energy, exergy, environmental and economic analysis

Sensitivity analysis and multi-objective optimization of energy consumption and thermal comfort by using interior light shelves in residential buildings

Failure analysis of ductile iron crankshaft in compact pickup truck diesel engine

In this article, failure analysis was examined in four-cylinder light-duty truck diesel engine crankshaft. The failure happened in service after 95,000 km of operation by fatigue crack growth which was initiated from a surface defect on the second crankpin from the crankpin–web fillet. For such objective, standard specimens were cut off from the crankshaft and examined to evaluate the mechanical properties. Some hardness and tensile tests were conducted, and spectrometry analysis was used in order to study the chemical composition of the crankshaft material. Also, for considering and evaluating the microstructure, microcracks, fracture surface and the cause of failure, optical microscopy and scanning electron microscopy equipped with energy-dispersive spectrometry were used. The morphology of the fracture surface shows that the failure happened in the second crankpin at the crankpin–web fillet of crankshaft where the stress concentration was the highest.

Failure analysis of four-cylinder diesel engine crankshaft

Using light shelves (LSs) is one of the passive-enhancement methods for energy saving and providing better thermal comfort conditions of the building users. The goal of this research is to create a consistent daylight environment that improves the visual and thermal comfort of users in buildings. Comfort effects on the four fronts of a building (in the Pars residential complex of Mashhad city in Iran as a case study) are investigated. Five types of LSs are suggested for improving the building’s thermal and visual conditions. Then, the illuminance analysis is performed for the building with and without the LSs. Horizontal and vertical LSs are considered in building to enhance visual quality and uniformity of daylight in the building space. According to the highest and lowest light intensity in the investigated spaces, the LS that provides optimal visual conditions for space is selected. Then, the role of optimum LS in thermal comfort and energy indicators (heating, cooling, and electricity) has been investigated and compared with the base situation. Analyzing the results reveals that using the optimal LS causes an annual average improvement of 18%, 11%, and 7% in the demand for heating, cooling, and electricity, respectively, of the building throughout the year.

Karim Aliakbari

Papers

Proposal and assessment of a novel combined heat and power system: Energy, exergy, environmental and economic analysis

Sensitivity analysis and multi-objective optimization of energy consumption and thermal comfort by using interior light shelves in residential buildings

Failure analysis of ductile iron crankshaft in compact pickup truck diesel engine

Failure analysis of four-cylinder diesel engine crankshaft

Performance analysis of light shelves in providing visual and thermal comfort and energy savings in residential buildings