Hamid Mohsenimonfared

Bio: Hamid Mohsenimonfared is an academic researcher from Islamic Azad University, Arak. The author has contributed to research in topics: Combined cycle & Exergy. The author has an hindex of 2, co-authored 5 publications receiving 9 citations.

Free Vibration Analysis of 2D Functionally Graded Annular Plate considering the Effect of Material Composition via 2D Differential Quadrature Method

Abstract: This study investigates the free vibration of the Two-Dimensional Functionally Graded Annular Plates (2D-FGAP). The theoretical formulations are based on the three-dimensional elasticity theory with small strain assumption. The Two-Dimensional Generalized Differential Quadrature Method (2D-GDQM) as an efficient and accurate semi-analytical approach is used to discretize the equations of motion and to implement the various boundary conditions. The fast rate of convergence for this method is shown and the results are compared with the existing results in the literature. The material properties are assumed to be continuously changing along thickness and radial directions simultaneously, which can be varied according to the power law and exponential distributions, respectively. The effects of the geometrical parameters, the material graded indices in thickness and radial directions, and the mechanical boundary conditions on the frequency parameters of the two-dimensional functionally graded annular plates are evaluated in detail. The results are verified to be against those given in the literature.

Exergy and thermoeconomic analysis of the combined MED desalination system and the Allam power generation system

Abstract: Because of population growth, demands for water and energy for domestic, industrial, and agricultural usages are increasing. Considerable research has been conducted in recent years to evaluate the thermodynamics and optimization of desalination systems. One important concept is the capacity to integrate power generation systems with desalination plants. The purpose of this study is to analyze the exergy and thermoeconomics of the combined desalination system (MED) and Allam power generation system. The key advantage of this proposed system is to use the heat generated in the Allam power generation system to operate the desalination system. Similarly, due to the performance of the Allam generation system, the amount of carbon dioxide produced is virtually zero. By determining the processes and solving the governing equations, the properties of the fluids passing through the combined cycle of Allam and MED are determined and thermodynamic, exergetic and thermoeconomic analysis is performed along with the thermoeconomic optimization of the system. In this research, genetic algorithm has been used for optimization and the result has been described in multi-objective optimization. Subsequently, parametric analysis and the effect of design variables on the system cost function have been accomplished. The results show that in a specific vector of decision variables, the objective functions including, the exergetic efficiency and the cost of the product produced by the system are optimized simultaneously. In conventional desalination plants, a boiler is used to supply the steam entering the desalination system. After conducting the model simulation of the desalination system, the Allam generation system is modeled as well. Thus, by combining these two systems, the heat generated by the Allam generation system can be used to evaporate water in the desalination system. In the ideal case, the price of fresh water of using the steam produced by the boiler is $1.131 per cubic meter, and by means of the steam produced by the power generation system would be $1.087 per cubic meter. Hence, the results indicate that combining the desalination system with the Allam generation system provides a 4% reduction. Reducing carbon dioxide emissions is also a significant benefit of this system.

Thermoeconomic analysis of combined steam and organic Rankine cycle with primary mover of Allam cycle

Abstract: Because of the fossil fuels crisis in recent years, increasing fossil fuel consumption and the oil crisis, energy efficiency is becoming a major concern of the twenty-first century. In this research, the combined cycle of steam Rankine and organic Rankine with the primary mover of the Allam generation cycle has been simulated. The hybrid cycle is configured in such a way that the high temperature waste heat first acts as the steam cycle evaporator and the waste heat output from the steam cycle evaporator is used as the low temperature evaporator of the organic cycle. Then, the effect of changing various parameters such as evaporator temperature and steam cycle condenser pressure on output work values, total irreversibility, energy efficiency, exergy efficiency and exergy-economic variables is investigated. The results show that the energy efficiency and exergy efficiency of the combined cycle are 0.57 and 0.66, respectively, and the amount of output work and total irreversibility are 150,125 kW and 91,237 kW, respectively. Also, according to the study results, a lot of exergy destruction takes place in the system, thus it is recommended to increase the initial price in different components in order to improve the performance of the system. Evaporators and steam cycle condensers are components that should be considered from an exergy-economic perspective, as they have the highest rate for the sum of the initial cost rate and the cost of exergy destruction.

Free Vibration of Annular Plate Reinforced with Multi-walled Carbon Nanotubes Resting on an Elastic Foundation Using Refined Theory

Abstract: In this paper, an attempt is made for solution of free vibration analysis of annular plate reinforced with carbon nanotubes for Uniformly Distribution (UD), resting on an elastic foundation using a refined theory presented. In this theory, a parabolic distribution of shear stress and strain in the thickness direction and satisfies the boundary conditions of zero shear stress on the upper and lower crust cut without using a correction factor to be considered. The equations of motion are obtained using Hamilton's principle. And then these equations are solved by GDQ method .Factors affecting the frequency such large radius to small radius, the ratio of thickness to the radius of the annular plate, the length of the radius is obtained. To check the compatibility equations and solving method is used, a comparison between the present work has been done with papers

Exergy and thermoeconomic analysis of a combined Allam generation system and absorption cooling system

Abstract: In recent years, the use of Allam cycle based on the closed cycle of carbon dioxide has been considered by researchers due to its high efficiency and reduction of carbon dioxide emissions in the environment. In the present study, the combined system including Allam cycle and absorption cycle has been investigated from the perspective of energy, exergy and exergy–economy. The use of the absorption cycle is to use the waste heat of the power cycle and increase energy efficiency. The simulation results show that the total exergy efficiency of the cogeneration cycle is 0.72. Turbine, compressor and absorption cycle are introduced as primary components that should be considered from the exergy–economic point of view because they account for the highest cost rate of exergy efficiency. Also, the results of parametric analysis indicate that increasing the compressor pressure ratio has a negative effect on the cycle performance, thus reducing the overall work and efficiency of the exergy as well as increasing the cost rate. Similarly, changing the compressor pressure ratio has the greatest impact on the performance of the combined cycle, so that changing the pressure ratio in the range of 2 to 10 resulted in reducing the exergy efficiency by 63%. The key assessment is that the performance of the system increases as the temperature of the cooled water in the evaporator rises. Exergy efficiency works in contrast to the system performance coefficient and the main reason for the return of imperfections in the absorption cooling system is the undesirable heat transfer in the system heat exchangers.