Entity

Time filter

Source Type


Ahmadi M.H.,K. N. Toosi University of Technology | Dehghani S.,K. N. Toosi University of Technology | Mohammadi A.H.,Institute Of Recherche En Genie Chimique Et Petrolier Irgcp | Mohammadi A.H.,University of KwaZulu - Natal | And 2 more authors.
Energy Conversion and Management | Year: 2013

To study the optimum design factors and the optimal thermo-economical performances an optimal performance analysis of a solar driven heat engine system at maximum thermo-economical objective function conditions is done numerically. In the present investigation, thermodynamic analysis and NSGAII algorithm are employed to optimize objective function associated to the power output, thermal efficiency for a Solar driven engine system. Three decision-making procedures are applied to optimized answers from the results. The error through investigation is shown using error analysis. © 2013 Elsevier Ltd. All rights reserved. Source


Ahmadi M.H.,K. N. Toosi University of Technology | Mohammadi A.H.,Institute Of Recherche En Genie Chimique Et Petrolier Irgcp | Mohammadi A.H.,University of KwaZulu - Natal | Dehghani S.,K. N. Toosi University of Technology
Energy Conversion and Management | Year: 2013

In this communication, the optimal power of an endoreversible Stirling cycle with perfect regeneration is investigated. In the endoreversible cycle, external heat transfer processes are irreversible. Optimal temperature of the heat source leading to a maximum power for the cycle is detained. Moreover, effect of design parameters of the Stirling engine on the maximized power of the engine and its corresponding thermal efficiency is studied. © 2013 Elsevier Ltd. All rights reserved. Source


Ahmadi M.H.,K. N. Toosi University of Technology | Sayyaadi H.,K. N. Toosi University of Technology | Mohammadi A.H.,Institute Of Recherche En Genie Chimique Et Petrolier Irgcp | Mohammadi A.H.,University of KwaZulu - Natal | Barranco-Jimenez M.A.,Escuela Superior de cOmputodel IPN
Energy Conversion and Management | Year: 2013

In the recent years, remarkable attention is drawn to Stirling engine due to noticeable advantages, for instance a lot of resources such as biomass, fossil fuels and solar energy can be applied as heat source. Great number of studies are conducted on Stirling engine and finite time thermo-economic is one of them. In the present study, the dimensionless thermo-economic objective function, thermal efficiency and dimensionless power output are optimized for a dish-Stirling system using finite time thermo-economic analysis and NSGA-II algorithm. Optimized answers are chosen from the results using three decision-making methods. Error analysis is done to find out the error through investigation. © 2013 Elsevier B.V. All rights reserved. Source


Ahmadi M.H.,K. N. Toosi University of Technology | Hosseinzade H.,K. N. Toosi University of Technology | Sayyaadi H.,K. N. Toosi University of Technology | Mohammadi A.H.,Institute Of Recherche En Genie Chimique Et Petrolier Irgcp | And 2 more authors.
Renewable Energy | Year: 2013

In the recent years, numerous studies have been done on Stirling cycle and Stirling engine which have been resulted in different output power and engine thermal efficiency analyses. Finite speed thermodynamic analysis is one of the most prominent ways which considers external irreversibilities. In the present study, output power and engine thermal efficiency are optimized and total pressure losses are minimized using NSGA algorithm and finite speed thermodynamic analysis. The results are successfully verified against experimental data. © 2013 Elsevier Ltd. Source


Mohammadi A.,University of Bojnord | Manteghian M.,Tarbiat Modares University | Mohammadi A.H.,Institute Of Recherche En Genie Chimique Et Petrolier Irgcp | Mohammadi A.H.,University of KwaZulu - Natal
Journal of Chemical and Engineering Data | Year: 2013

One of the limitations in the process of hydrate formation to benefit its positive application is high pressure and low temperature conditions. Design and construction of a unit with the aforementioned conditions is therefore expensive and unsafe. Thus, an investigation of methods for moderation of hydrate formation conditions seems to be very important. As mentioned in literature, utilization of ammonium salts in water normally promotes the hydrate formation conditions. One of these salts is tetra-n-butylammonium fluoride (TBAF). In this research, the dissociation data of semiclathrate hydrates for the systems of methane + TBAF + water, carbon dioxide + TBAF + water, and nitrogen + TBAF + water have been measured and reported. Experimental measurements were performed at three concentrations of TBAF, that is, (0.02, 0.05, and 0.15) mass fraction. A comparison of hydrate dissociation data in the presence or absence of TBAF shows the promotion effect of TBAF on methane, carbon dioxide, and nitrogen hydrate formation. By increasing the concentration of TBAF from (0.02 to 0.15) mass fraction, its promotion effect increases, and the p-T curves of the double gas + TBAF semiclathrate systems shift to the low pressure and high temperature regions (moderate conditions). Results of the experiments show that, contrary to clathrate hydrates, a small increase in temperature of semiclathrate hydrates, studied herein, leads to a noticeable increase in dissociation pressure. © 2013 American Chemical Society. Source

Discover hidden collaborations