University of TehranEnergy Equipment and Systems2383-11115420171201Selection of the optimum prime mover and the working fluid in a regenerative organic rankine cycle3253392896910.22059/ees.2017.28969ENHassan HajabdollahiDepartment of Mechanical Engineering, Vali-e-Asr University of Rafsanjan, Rafsanjan, IranAlireza EsmaieliDepartment of Mechanical Engineering, Vali-e-Asr University of Rafsanjan, Rafsanjan, IranJournal Article20161013A regenerative organic Rankine cycle (RORC) is modeled and optimized for the use of waste heat recovery from a prime mover (PM). Three PMs including, a diesel engine, a gas engine, and a microturbine are selected in this study. Four refrigerants including isobutane, R123, R134a, and R245fa are selected. The nominal capacity of the PM, PM operating partial load, turbine inlet pressure, condenser pressure, refrigerant mass flow rate, pump efficiency, turbine efficiency, and regenerator effectiveness are considered as the decision variables. Then, the Genetic Algorithm is applied to maximize the thermal efficiency and minimize the total annual cost (TAC), simultaneously. The optimum results demonstrate that the best working fluid and the PM are, respectively, R123 and the diesel engine, which have a thermal efficiency of 0.50 and a TAC of $170,276/year. The optimum results are compared with each of the other studied cases. For example, the optimum result in the case of a diesel engine working with R123 shows a 2% and 2.52% improvement in the thermal efficiency and the TAC, respectively, in comparison to the case of a gas engine working with R123. Furthermore, a 26% and an 18.38% improvement in the thermal efficiency and the TAC are found when the best-studied cycle is compared with a microturbine and R123.University of TehranEnergy Equipment and Systems2383-11115420171201Energy efficiency in a building complex through seasonal storage of thermal energy in a confined aquifer3413482897010.22059/ees.2017.28970ENHadi GhaebiDepartment of Mechanical Engineering, University of Mohaghegh Ardabili, P.O.B. 179, Ardabil, IranMehdi BahadorinejadSchool of Mechanical Engineering, Sharif University of Technology, P.O. Box 11155-9567, Tehran, IranMohammad Hassan SaidiSchool of Mechanical Engineering, Sharif University of Technology, P.O. Box 11155-9567, Tehran, IranJournal Article20161212Confined aquifers are formations surrounded by impermeable layers called cap rocks and bed rocks. These aquifers are suitable for the seasonal storage of thermal energy.<br /> A confined aquifer was designed to meet the cooling and heating energy needs of a residential building complex located in Tehran, Iran. The annual cooling and heating energy needs of the buildings were estimated to be 8.7 TJ and 1.9 TJ, respectively. Two different alternatives were analyzed for an aquifer thermal energy storage (ATES) system. These alternatives were: 1) using ATES for cooling alone, and 2) coupling ATES with a heat pump for both cooling and heating. The thermal annual energy recovery factor and the annual coefficient of performance (COP) of the system were determined. A COP of 10 was obtained when ATES was employed for cooling alone. When ATES was employed for cooling and heating (using a heat pump), a COP of 17 was obtained for the cooling mode, and 5 for the heating mode.University of TehranEnergy Equipment and Systems2383-11115420171201Proposing a quantitative approach to measure the success of energy management systems in accordance with ISO 50001: 2011 using an analytical hierarchy process (AHP)3493552897110.22059/ees.2017.28971ENAbdorrahman HaeriSchool of Industrial Engineering, Iran University of Science & amp; Technology, Tehran, IranJournal Article20170118ISO 50001: 2011 provides an integrated and systematic framework to plan, implement, operate, certify, and maintain energy management systems (EMSs). Evaluation of organizations in relation to meeting the standard requirements is performed by an auditing qualitative approach. In this research, a quantitative approach has been proposed and implemented to assess organizations and rank them based on the related capabilities of the EMS. Initially, ISO 50001 was accurately reviewed to extract requirements. Later, an analytical hierarchy process (AHP) was used to perform pair-wise comparison and to specify the importance factors of ISO 50001 requirements. A number of Iranian oil and gas plants were evaluated in accordance with the specified requirements of ISO 50001. The results of the evaluation were used to rank the considered plant in capabilities of the EMS. In addition, it was used to specify which areas of ISO 50001 need more attention in the considered plants. Finally, the improvement approaches were proposed to enable Iranian oil and gas plants to increase the effectiveness of the implemented EMS.University of TehranEnergy Equipment and Systems2383-11115420171201Effects of supportive spaces and people on heating energy demand in cold climate in Iran3573742897210.22059/ees.2017.28972ENAzin KeshtkarbanaeemoghadamDepartment of Architecture, Damavand Branch, Islamic Azad University Damavand, IranMohammad Hadi KaboliDepartment of Architecture, Damavand Branch, Islamic Azad University Damavand, IranAli DehghanbanadakiDepartment of Civil Engineering, Damavand Branch, Islamic Azad University, Damavand, IranJournal Article20170307<span>Decreasing heating needed energy of building located in mountainous areas without any urban infrastructure of energy supply and services is one of the most important things to get thermal comfort. Accordingly, using building conditions based on different types of applicability and passive design strategies should be considered. Therefore, the objective of this study was to achieve the proper heating needed energy for proposing functional model as a mountainous shelter located in Iran. Two influence factors namely, number of people per area and different supportive space were considered. The analysis has been performed by Honeybee and Ladybug add-ons in Rhino/Grasshopper software. Material characteristic, zone load, location and climate data as sub-parameter were calculated using ASHRAE Standard 90.1-2010. The results indicated that regarding to time-use period of the shelter that is mostly in warm months, the highest performance of the space, based on minimum heating needed energy was attributed to the maximum size of supportive space by 608 m2 when the number of people was 0.26 per area. The reduction of heating needed energy was 17% in cold month and 23% in warm month.</span>University of TehranEnergy Equipment and Systems2383-11115420171201Equipment capacity optimization of an educational building’s CCHP system by genetic algorithm and sensitivity analysis3753872897410.22059/ees.2017.28974ENMohammadreza ShahnazariDepartment of Mechanical Engineering K.N. Toosi University of Technology, Tehran, IranLeila Samandari-MasoulehDepartment of Chemical Engineering, College of Engineering University of Tehran, Tehran, IranSaeed EmamiDepartment of Management Islamic Azad University, North Tehran Branch, Tehran, IranJournal Article20170317Combined cooling, heating, and power (CCHP) systems produce electricity, cooling, and heat due to their high efficiency and low emission. These systems have been widely applied in various building types, such as offices, hotels, hospitals and malls. In this paper, an economic and technical analysis to determine the size and operation of the required gas engine for specific electricity, cooling, and heating load curves during a year has been conducted for a building. To perform this task, an objective function net present value (NPV) was introduced and maximized by a genetic algorithm (GA). In addition, the results end up finding optimal capacities. Furthermore, a sensitivity analysis was necessary to show how the optimal solutions vary due to changes in some key parameters such as fuel price, buying electricity price, and selling electricity price. The results show that these parameters have an effect on the system’s performance.University of TehranEnergy Equipment and Systems2383-11115420171201RETRACTED! Transient stability enhancement of DFIG based 10 MW wind farm by using of new inductive bridge type fault current limiter3893992897510.22059/ees.2017.28975ENMd Emrad HossainDepartment of Electroconvulsive Therapy (ECT), Remington College, Memphis, Tennessee, USAJournal Article20170417<span style="text-decoration: underline;"><strong>RETRACTED</strong></span>University of TehranEnergy Equipment and Systems2383-11115420171201The finite element analysis of the linear hybrid reluctance motor for the electromagnetic launch system4014092897610.22059/ees.2017.28976ENHassan Moradi CheshmehbeigiElectrical Engineering Department, Engineering Faculty, Razi University, Kermanshah, IranFarzad FathiniaElectrical Engineering Department, Engineering Faculty, Razi University, Kermanshah, IranJournal Article20161107The Electromagnetic Aircraft Launch System (EMALS) is being developed utilizing electrical and electronic technologies. EMALS is emerging in order to replace the existing steam catapult on naval carriers. Recently, the double-sided linear launcher has drawn increasing attention of researchers. This paper presents the design and analysis of the Linear Hybrid Reluctance Motor (LHRM). This new motor is characterized by a stator, formed by a combination of independent magnetic structures. Each magnetic structure is composed of an electromagnet—the magnetic core with one or several coils wound around it and associated with a permanent magnet, disposed between their poles. The rotor has the same configuration of a switched reluctance motor (SRM) without any coil, magnets or squirrel cage. In order to improve the thrust of LHRM, the structural characteristics and magnetic field are analyzed. According to the initial design, the Finite Element Analysis (FEA) is presented to obtain the magnetic cogging force and thrust force. Moreover, the effects of the parameters on the thrust and thrust ripple waveforms are analyzed using FEA.University of TehranEnergy Equipment and Systems2383-11115420171201Energy flow modeling of broiler production in Guilan province of Iran4114182897710.22059/ees.2017.28977ENSaeed FirouziDepartment of Agronomy, Rasht Branch, Islamic Azad University, Rasht, IranMohammad BagherzadehDepartment of Agronomy, Rasht Branch, Islamic Azad University, Rasht, IranAmir Hossein BazyarSama Technical and Vocational training college, Rasht Branch, Islamic Azad University, Rasht, IranJournal Article20170529The aim of this research was to study the energy flow and the modelling of energy use in broiler production in the Guilan Province of Iran. The data were gathered through interview with 25 broiler farm managers out of a total of 146 broiler producers in Rasht, the center of Guilan Province, Iran. The effect of broiler farm size at three levels—small (˂20,000 birds), medium (20,000–30,000 birds), and large (˃30,000 birds)–was evaluated, based on the energy use indices. The Cobb-Douglas model and sensitivity analysis were used to investigate the effects of energy inputs on poultry production. The results showed that the total energy input and energy ratio were 2,605.54 Mcal (1000 birds)<sup>-1</sup> and 0.234, respectively. Diesel fuel and feed were ranked the first and second energy inputs for broiler production with the shares of 43.92% and 36.68%, respectively, of the total energy input. The shares of renewable and non-renewable energy forms in broiler production were determined to be 37.33% and 62.67% of the total energy input, respectively. The energy ratios of small, medium, and large farms were computed as 0.232, 0.225, and 0.250, respectively. Consequently, the large-sized farms were more energy efficient than the small and medium-sized ones. Results of the Cobb-Douglas model showed that the impacts of energy inputs of labor, chick, diesel fuel, machinery, disinfectants, and medicines on broiler performance were positive, while the impacts of electricity and feed were negative.University of TehranEnergy Equipment and Systems2383-11115420171201Multi objective optimization of the MED-TVC system with exergetic and heat transfer analysis4194302897810.22059/ees.2017.28978ENSomayyeh SadriFaculty of Mechanical and Energy Engineering, Shahid Beheshti University, P.O. Box 16765-1719, Tehran, IranRamin Haghighi KhoshkhooFaculty of Mechanical and Energy Engineering, Shahid Beheshti University, P.O. Box 16765-1719, Tehran, IranMohammad AmeriFaculty of Mechanical and Energy Engineering, Shahid Beheshti University, P.O. Box 16765-1719, Tehran, IranJournal Article20170608The mathematical model to predict the performance and the exergetic efficiency in a multi-effect desalination system with thermal vapor compression (MED-TVC system) has been presented. The energy and the concentration conservation law were developed for each effect, considering the boiling point elevation and the various thermodynamic losses by developing the mathematical models. These analyses led to the determination of the thermodynamic properties at different points and to the gain output ratio (GOR) values. Then, a heat transfer equation was developed in each effect and the required heat transfer areas were determined. Finally, irreversibility analysis was performed, from which the exergy destruction (considering chemical and physical exergy) and the exergetic efficiency were calculated. To obtain the optimum point of a system, multi-objective optimization was used. Determination of the best trade-off between GOR and heat transfer area was the final goal of this optimization. The optimum design led to a selected system with the lowest heat transfer area (and related cost) and the highest GOR.University of TehranEnergy Equipment and Systems2383-11115420171201Numerical simulation of a solar chimney power plant in the southern region of Iran4314372897910.22059/ees.2017.28979ENMorteza BayarehDepartment of Mechanical Engineering, Faculty of Engineering, Shahrekord University, Shahrekord, IranJournal Article20170808Three-dimensional numerical simulations are performed to investigate the effects of pressure drop across the turbine and solar radiance on the performance of a solar chimney power plant (SCPP). The SCPP system expected to provide electric power to a city is located in southern region of Iran (city of Lamerd, Fars province). Its dimensions are similar to the Manzanares prototype (built in Spain, 1970s). The results demonstrated that the SCPP can provide up to 40–200 KW of power, depending on the season. It was found that the turbine pressure drop and the solar radiation had significant effects on the first and second law efficiencies.