Investigating carbon emission abatement long-term plan with the aim of energy system modeling; case study of Iran
Mohsen
Sharifi
Department of Energy Systems Engineering, Faculty of Mechanical Engineering, K. N. Toosi University of Technology, Tehran, Iran
author
Majid
Amidpour
Department of Energy Systems Engineering, Faculty of Mechanical Engineering, K. N. Toosi University of Technology, Tehran, Iran
author
Saeed
Mollaei
Department of Energy Systems Engineering, Faculty of Mechanical Engineering, K. N. Toosi University of Technology, Tehran, Iran
author
text
article
2018
eng
Increasing electric vehicles usage, as a promising solution for environmental issues, might have unexpected implications, since it entails some changes in different sectors and scales in energy system. In this respect, this research aims at investigating the long-term impacts of electric vehicles deployment on Iran's energy system. Accordingly, Iran's energy system was analyzed by LEAP model in demand, supply, and transmission sides for all fuels and two different scenarios. Existing policies with limited optimistic assumptions was investigated as "reference" scenario. Alternatively, the other scenario, "electric cars" scenario, is gradually for substitution of electric vehicles for 15% gasoline cars until 2030 and renewable energy sources have more contribution in electricity production. Finally, carbon dioxide emission was predicted and compared in both scenarios for 25 years later. Results indicate that with "electric cars" scenario at 2030, Iran would have by 9.2 % and 1.9% less Carbon Dioxide emissions in comparison to the "reference" scenario in the transportation sector and total system, respectively.
Energy Equipment and Systems
University of Tehran
2383-1111
6
v.
4
no.
2018
337
349
https://www.energyequipsys.com/article_33307_eb5f4bf1750ba897caef3d812996c699.pdf
dx.doi.org/10.22059/ees.2018.33307
A mixed integer nonlinear programming model for optimizing a gas pipeline transmission linear network
Seyed Hossain
Ebrahimi
Department of Industrial Engineering, Shomal University, Amol, Iran
author
Ahmad
J.Afshari
Department of Industrial Engineering, Shomal University, Amol, Iran
author
text
article
2018
eng
The technical equipment developed and used in both installation and operation processes in refineries, oil and gas pipelines, and gas booster stations has always been expensive. Hence, managers at different organizational levels are keen to find methods to control and reduce these costs. Generally speaking, the operators in a gas booster station choose the operating devices without considering the related costs. This research presents a mixed integer nonlinear programming model designed to minimize the operational costs of gas booster stations in a main pipeline distribution network. The goal is to optimize the choice of operating devices in these stations to minimize costs while still meeting customer demands. Turbo compressors are chosen as the operating devices and the operational costs are fuel, maintenance, start-up, and penalty costs. However, the significance indexes of these costs are valued differently by the three expert managers: the executive officer, operating head, and the overhaul repairing director. Consequently, the analytical hierarchy process (AHP) method is used to calculate the overall weights of costs, and a gas transmission company in the north of Iran is considered as a case study. The model can minimize the total cost, when compared to the selections of ten experienced operators; however, the absolute weights of choosing measures and the essence of the objective function under study mean that an operator choice exists that would represent the optimum selection of turbo compressors.
Energy Equipment and Systems
University of Tehran
2383-1111
6
v.
4
no.
2018
351
366
https://www.energyequipsys.com/article_33308_c6d53d2a79754469bdf3f18d0593dd5b.pdf
dx.doi.org/10.22059/ees.2018.33308
The development and assessment of solar-driven Tri-generation system energy and optimization of criteria comparison
Amir
Ghasemkhani
Department of Mechanical Engineering, Faculty of Engineering, University of Sistan and Bluchestan, Zahedan, Iran
author
Said
Farahat
Department of Mechanical Engineering, Faculty of Engineering, University of Sistan and Bluchestan, Zahedan, Iran
author
Mohammad Mahdi
Naserian
Department of Mechanical Engineering, Faculty of Engineering, University of Sistan and Bluchestan, Zahedan, Iran
author
text
article
2018
eng
In this research, the thermodynamic investigation of the tri-generation system is performed by the first and second law of Thermodynamics. The trigeneration system under study consists of three subsystems including the solar subsystem, Kalina subsystem and lithium bromide-water absorption chiller subsystem. The proposed system generates power, cooling and hot water using solar energy. The system considered is designed and evaluated based on the climate condition in Zahedan, Iran. The calculation results show that the most exergy destruction rate takes place in the solar cycle. The assessment of system is used dynamic and static forms. In dynamic form, that maximum total cost rate, energy and exergy efficiency are equal to 15.1 dollars per hour,by 33% and 36.47%, respectively. The results base-case demonstrate that energy and exergy efficiencies and total cost rates are equal to 9.63 dollars per hour by 17.37% and 18.82% , respectively in static analysis. Furthermore, optimization criteria comparison such as energy efficiency, exergy efficiency and power are discussed in static form. The results of static evaluation revealed that the power is the best criteria for thermodynamics. Moreover, optimization results based on maximum power criterion show that produced power, energy efficiency, exergy efficiency and total cost rate increase by 28%, 12.32%, of 13.97% and 7.68%, respectively in comparison with the base case.
Energy Equipment and Systems
University of Tehran
2383-1111
6
v.
4
no.
2018
367
379
https://www.energyequipsys.com/article_33309_f75ebea39a768e3764b110da20afef35.pdf
dx.doi.org/10.22059/ees.2018.33309
Damping analysis of sub-synchronous resonance (SSR) in a wind farm based on DFIG in a series compensated network
Ali
Ghasemi
Faculty of Electrical and Computer Engineering Shahid Rajaee Teacher Training University, Tehran, Iran
author
Mohammad Hossein
Refan
Faculty of Electrical and Computer Engineering Shahid Rajaee Teacher Training University, Tehran, Iran
author
Parviz
Amiri
Faculty of Electrical and Computer Engineering Shahid Rajaee Teacher Training University, Tehran, Iran
author
text
article
2018
eng
The effect of wind generator on sub-synchronous resonance (SSR) is being interested by increasing penetration of wind turbine in power systems,. Purpose of this article is to analyze SSR in a wind farm based on doubly fed induction generator (DFIG) which is connected to compensating series grid. A dynamic model for analysis of induction generator effect and Torsional Interaction (TI) has been utilized and simulated. The IEEE first benchmark model, is modified to include a 100 MW DFIG-based wind farm, is employed as a case study. three phenomena including a) series compensation level, b) the rotor speed, and c) effect of internal parameters of RSC controller on SSR are evaluated and the simulation results are analyzed.
Energy Equipment and Systems
University of Tehran
2383-1111
6
v.
4
no.
2018
381
392
https://www.energyequipsys.com/article_33310_787e021aa8b0a2f9126b0a6ead411453.pdf
dx.doi.org/10.22059/ees.2018.33310
Study of flow and heat transfer characteristics in a periodic zigzag channel for cooling of polymer electrolyte fuel cells
Elham
Kazemi
Mechanical Engineering Department, Shahrekord University, Shahrekord, Iran
author
Alireza
Shateri
Mechanical Engineering Department, Shahrekord University, Shahrekord, Iran
author
text
article
2018
eng
In this study, a periodic zigzag channel with rectangular cross-section has been used in order to obtain a high-efficiency system for cooling a polymer electrolyte fuel cell. An appropriate function of fuel cells and enhancement of their lifetime require uniform temperature conditions of around 80°C. On the other hand, due to volume and weight constraints, a low-density compact heat exchanger is required, where the coolant fluid is water and the flow regime is laminar with a Reynolds number of 200. In order to consider these problems and increase the heat transfer rate under these conditions, a three-dimensional periodic zigzag channel is employed and the results are compared with the results which have been obtained for the straight channel. The results indicate that the zigzag channel generates chaotic advection and provides a good mixture of the hot fluid adjacent to the wall and the cool fluid away from it. This leads to a uniform temperature distribution along the channel. In addition, the values of Nusselt number and friction coefficient show that average Nusselt number in the zigzag channel is 6.5 times larger than that in the straight channel while the pressure drop remains approximately constant.
Energy Equipment and Systems
University of Tehran
2383-1111
6
v.
4
no.
2018
393
412
https://www.energyequipsys.com/article_33311_3524e9ce9a9da65e05d22a25076f65a1.pdf
dx.doi.org/10.22059/ees.2018.33311
Thermoeconomic analysis of a hybrid PVT solar system integrated with double effect absorption chiller for cooling/hydrogen production
Amirmohammad
Behzadi
School of Mechanical Engineering, College of Engineering, University of Tehran, P.O. Box 11155-4563, Tehran, Iran
author
Ehsan
Gholamian
School of Mechanical Engineering, College of Engineering, University of Tehran, P.O. Box 11155-4563, Tehran, Iran
author
Ehsan
Houshfar
School of Mechanical Engineering, College of Engineering, University of Tehran, P.O. Box 11155-4563, Tehran, Iran
author
Mehdi
Ashjaee
School of Mechanical Engineering, College of Engineering, University of Tehran, P.O. Box 11155-4563, Tehran, Iran
author
Ali
Habibollahzade
School of Mechanical Engineering, College of Engineering, University of Tehran, P.O. Box 11155-4563, Tehran, Iran
author
text
article
2018
eng
A novel solar-based combined system which is consisting of a concentrated PV, a double effect LiBr-H2O absorption chiller, and a Proton Exchange Membrane (PEM) is proposed for hydrogen production. A portion of the received energy is recovered to run a double effect absorption chiller and the rest is turned into electricity, being consumed in the PEM electrolyzer for hydrogen production. The thermodynamic and thermoeconomic analyses are performed to understand the system performance. A parametric study which is implementing Engineering Equation Solver (EES) is carried out to assess the influence of main decision parameters on the overall exergy efficiency and total product unit cost. The 2nd law analysis shows that PVT with exergy destruction rate of 76.9% of total destruction rate is the major source of irreversibility. Furthermore, in the cooling system, Cooling Set (CS) has the highest exergy destruction rate due to the dissipative components. Exergoeconomic results demonstrate that in cooling set with the lowest value of exergoeconomic factor, the cost of exergy destruction and loss has the major effect on the overall cost rate. Furthermore, results of the parametric study indicate that by decreasing PV cell’s temperature from 100 °C to 160 °C, the total product unit cost is decreased by about 1.94 $/GJ.
Energy Equipment and Systems
University of Tehran
2383-1111
6
v.
4
no.
2018
413
427
https://www.energyequipsys.com/article_33319_8909599f32c82c648bf80aeab5d08108.pdf
dx.doi.org/10.22059/ees.2018.33319
Developing off-design model of Yazd integrated solar combined cycle for analyzing environmental benefits of using solar energy instead of supplementary firing
Bagher
Shahbazi
Faculty of Mechanical Engineering, University of Tabriz, Tabriz, Iran
author
Faramarz
Talati
Faculty of Mechanical Engineering, University of Tabriz, Tabriz, Iran
author
S.Mohammad
Seyyed Mahmoudi
Faculty of Mechanical Engineering, University of Tabriz, Tabriz, Iran
author
Mortaza
Yari
Faculty of Mechanical Engineering, University of Tabriz, Tabriz, Iran
author
text
article
2018
eng
An integrated solar combined cycle (ISCC) is analyzed at "off-design" operating conditions. Using the principles of thermodynamics heat and mass transfer a computer code is developed in FORTRAN programming language to simulate the system’s hourly performance under steady state conditions. Three scenarios are considered for the study. In the first one, only the combined cycle (CC) is studied. In the second scenario, two solar heat exchangers are added to the system (ISCC) to produce some extra steam fed to the steam turbine for more power production. In the third one, as that of the ISCC scenario, a supplementary firing is used instead of solar heat exchangers to produce the same power. The main performance parameters are calculated for the hourly variation of solar direct normal irradiation intensity (DNI) and ambient air temperature for analyzing environmental benefits of using solar energy instead of supplementary firing. Results show that the contribution of solar energy in the annual produced power by the ISCC scenario is 75.14 GWh, which is 2.1% of the whole. In addition, it is found that using solar energy leads to an annual reduction of 36.13 Kton in the produced CO2 and an annual fuel saving of 3.76 ton.
Energy Equipment and Systems
University of Tehran
2383-1111
6
v.
4
no.
2018
429
448
https://www.energyequipsys.com/article_33320_2ba1bf55f04f383d644dd4a544448532.pdf
dx.doi.org/10.22059/ees.2018.33320