Mohammad Nazififard | University of Kashan (original) (raw)

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Papers by Mohammad Nazififard

Iranian Journal of Radiation Safety and Measurement, Sep 10, 2013

Energy Engineering Management, Jan 10, 2019

Since the mean characteristic of nucleate boiling is bubble formation and collapse near the heati... more Since the mean characteristic of nucleate boiling is bubble formation and collapse near the heating surface, in this study attempts have been made to investigate heat transfer effects due to the bubbles ebullition and collapse cycle. All possible heat transfer mechanisms are studied qualitatively and quantitatively. For quantitative calculation of the heat transfer portion by each of the introduced mechanisms, a series of bubble parameters was selected from the experimental data provided by the high-speed photography of a heated rod containing nucleate boiling regime on its surface. According to the present results, the portion of the mechanisms such as latent heat transfer, super heated layer mixing and single-phase heat transfer are between 6~15%, 12~17%, and 3~5%, respectively. The results also show that the two mechanisms of the turbulence induced by the bubble formation and collapse and quenching have the main performance in transferring heat from the heating surface to the bul...

World Academy of Science, Engineering and Technology, International Journal of Mechanical and Mechatronics Engineering, 2016

Iranian Journal of Radiation Safety and Measurement, 2016

Iranian Journal of Radiation Safety and Measurement, 2014

International Journal of Energy Research, 2021

The main purpose of this study is to develop a sustainable smart energy management system for the... more The main purpose of this study is to develop a sustainable smart energy management system for the desert climate, which aims to reduce energy expenses, energy consumption, and greenhouse gas (GHG) emissions via finding optimum power output and smart scheduling while considering users' uncertain behaviors. Moreover, the effectiveness of five metaheuristic optimization algorithms is analyzed and reviewed for presented system, which is modeled as a multiobjective function and contains over 1000 variables. The case study is city of Kashan located at the desert area of Iran with hot and dry climate. Presented system is established based on smart residential energy hub and home energy management system. Residential loads for a modern household are appropriately categorized and modelled. Ten different uncertain scenarios for users' energy consumption are simulated within the algorithm with considering users' comfort level simultaneously. Both energy cost and users' comfort deviation for studied multi‐energy system are formulated as a multiobjective function with two weighting factors. Our results present a comparison between different cases studied and the effects of uncertain power consumption on energy cost, comfort level, and computing time. Our findings indicate that the presented system with specified weighting factors is able to reduce energy expenses around 50% in different cases. Accordingly, due to a noticeable decrease in energy consumption, GHG emissions from fossil fuels are reduced remarkably considering the fact that only 1% of Iran's power supply is provided by clean energies. Results also illustrate that considering uncertainty has more effect on users' comfort level than energy cost.

Sustainable Energy Technologies and Assessments, 2021

Sustainable Energy Technologies and Assessments, 2021

Abstract The development of renewable energy systems could be facilitated by appropriate energy p... more Abstract The development of renewable energy systems could be facilitated by appropriate energy policies according to the recognition of major barriers. Iran, with over 1,648,000 sq. km of suitable area and 300 sunny days per year, and over 2200 kWh/m2 of irradiation, has one of the highest potentials for utilization of solar energy on the planet. However, achieving the goals of renewable energy development based on Iranian roadmaps encounters various barriers. On the other hand, there is a research gap for conducting a comprehensive study by considering multiple-criteria decision-making (MCDM) methods and qualitative methods under uncertainty in investigating the barriers of photovoltaic developments. By combining Fuzzy MCDM methods and qualitative analysis ones, this study aims to respond to this research gap, particularly for the barriers facing Iran’s photovoltaic energy production development. This paper assesses the barriers based on Fuzzy analytic hierarchy process (Fuzzy-AHP) techniques. The Fuzzy-TOPSIS method is also used to determine how it is possible to overcome the challenges. The results imply that “messy economic situation” and “ineffective bureaucracy” are the most barriers hampering the development of photovoltaic energy production in Iran. Moreover, “Economic and financial incentives” and “mitigating bureaucratic efforts for permission approval” are the most effective solutions.

2020 6th International Conference on Electric Power and Energy Conversion Systems (EPECS), 2020

Using state of the art, which is Solar trailer, a cost-effective and efficient way to provide mic... more Using state of the art, which is Solar trailer, a cost-effective and efficient way to provide microgrid power for reducing shortages of the vulnerable population is presented. In this paper, the optimal design for a portable solar trailer is discussed in detail. Indeed, the energy is stored in a solar trailer employing some solar photovoltaic (PV) modules as well as diesel generator which can then be exploited to supply the required power in Battery energy storage (BES) to be used in providing medicines refrigeration, water treatment, and connecting to the web network. Employing HOMER software, the optimum system has been achieved and designed. Once the optimized system obtained in HOMER the interested solar trailer was designed in CATIA and prepared for production, based optimization results. It is worth mentioning that this optimum system is based on climatic conditions as well as the basic needs of the vulnerable community. The final proposed solar trailer in this paper incorporates one refrigerator, a water treatment device, eight solar panels of 400 W type, 12 batteries, a 4-kW generator.

Thermal Science, 2019

Heat transfer and pressure drop are numerically investigated for turbulent flows through a hexago... more Heat transfer and pressure drop are numerically investigated for turbulent flows through a hexagonal fuel rod bundle. For the purpose of numerical analysis, the geometric and boundary conditions were taken from the VVER-1000. Since VVER-1000 does not have mixing vane on the grid spacer of the fuel assembly, split mixing vane is designed to boost turbulent flow and heat transfer in the rod bundle subchannels. The computational domain including two grid spacers extend from 100 ? Dh upstream of the first grid spacer to 250 ? Dh downstream of the second grid spacer. The steady-state form of the RANS, mass, energy and turbulence equations was discretized and solved using ANSYS-CFX. The standard k-? model is employed to simulate turbulence. The results show a considerable increase in the average heat transfer to ~10 ? Dh downstream of the grid spacer using the mixing vane on the grid spacer of VVER type reactor. As expected, the pressure loss through the grid spacer also increased slightl...

Review of Scientific Instruments, 2016

Since the mean characteristic of nucleate boiling is bubble formation and collapse near the heati... more Since the mean characteristic of nucleate boiling is bubble formation and collapse near the heating surface, in this study attempts have been made to investigate heat transfer effects due to the bubbles ebullition and collapse cycle. All possible heat transfer mechanisms are studied qualitatively and quantitatively. For quantitative calculation of the heat transfer portion by each of the introduced mechanisms, a series of bubble parameters was selected from the experimental data provided by the high-speed photography of a heated rod containing nucleate boiling regime on its surface. According to the present results, the portion of the mechanisms such as latent heat transfer, super heated layer mixing and single-phase heat transfer are between 6~15%, 12~17%, and 3~5%, respectively. The results also show that the two mechanisms of the turbulence induced by the bubble formation and collapse and quenching have the main performance in transferring heat from the heating surface to the bul...

ASME 2011 Small Modular Reactors Symposium, 2011

This paper is aimed at understanding thermohydrodynamic and neutronic characteristics of nanoflui... more This paper is aimed at understanding thermohydrodynamic and neutronic characteristics of nanofluids for prospective application to water cooled small modular reactors. Numerical analysis is performed to investigate turbulent convective heat transfer and flow features of Al2O3 nanofluids as working fluid. The Al2O3-water nanofluids of 1%, 4% and 6% by volume have been employed for the numerical simulation resorting to the homogenous fluid assumptions with modified thermophysical properties. Results indicate that the heat transfer increases with nanoparticle volume concentrations by 4.2%–31% as compared against that for pure water. The maximum heat transfer increase at the center of a subchannel formed by fuel rods is 31.29% for the particle volume concentration of 6% corresponding to the Reynolds number of 65,000. It consequently appears promising enough to use nanofluids in small modular reactors. Neutronic and thermohydrodynamic investigations are further needed to streamline the n...

Radiation Protection Dosimetry, 2012

A Joint Automatic Dispenser Equipment (JADE) has been designed and fabricated for automatic withd... more A Joint Automatic Dispenser Equipment (JADE) has been designed and fabricated for automatic withdrawal and calibration of radiopharmaceutical materials. The thermoluminescent dosemeter procedures have shown a reduction in dose to the technician's hand with this novel dose dispenser system JADE when compared with the manual withdrawal of (99m)Tc. This system helps to increase the precision of calibration and to minimise the radiation dose to the hands and body of the workers. This paper describes the structure of this device, its function and user-friendliness, and its efficacy. The efficacy of this device was determined by measuring the radiation dose delivered to the hands of the nuclear medicine laboratory technician. The user-friendliness of JADE has been examined. The automatic withdrawal and calibration offered by this system reduces the dose to the technician's hand to a level below the maximum permissible dose stipulated by the international protocols. This research will serve as a backbone for future study about the safe use of ionising radiation in medicine.

Radiation Protection Dosimetry, 2012

A real-time automatic dose dispenser (RADD) has been designed and fabricated for automatic withdr... more A real-time automatic dose dispenser (RADD) has been designed and fabricated for automatic withdrawal and calibration of diagnostic radiopharmaceuticals such as those labelled with (99m)Tc. This system enhances the accuracy and precision of activity measurements and reduces personal radiation exposure. The structure, function, user-friendliness and performance of this device are described and examined for diagnostic activities of (99m)Tc ranging from 50 to 650 MBq. The results show that the RADD minimises the likelihood of miscalibration of radiopharmaceuticals due to human error and results in significantly reduced variability (i.e. higher precision) in dispensed activities of radiopharmaceuticals.

Iranian Journal of Radiation Safety and Measurement, Sep 10, 2013

Energy Engineering Management, Jan 10, 2019

Since the mean characteristic of nucleate boiling is bubble formation and collapse near the heati... more Since the mean characteristic of nucleate boiling is bubble formation and collapse near the heating surface, in this study attempts have been made to investigate heat transfer effects due to the bubbles ebullition and collapse cycle. All possible heat transfer mechanisms are studied qualitatively and quantitatively. For quantitative calculation of the heat transfer portion by each of the introduced mechanisms, a series of bubble parameters was selected from the experimental data provided by the high-speed photography of a heated rod containing nucleate boiling regime on its surface. According to the present results, the portion of the mechanisms such as latent heat transfer, super heated layer mixing and single-phase heat transfer are between 6~15%, 12~17%, and 3~5%, respectively. The results also show that the two mechanisms of the turbulence induced by the bubble formation and collapse and quenching have the main performance in transferring heat from the heating surface to the bul...

World Academy of Science, Engineering and Technology, International Journal of Mechanical and Mechatronics Engineering, 2016

Iranian Journal of Radiation Safety and Measurement, 2016

Iranian Journal of Radiation Safety and Measurement, 2014

International Journal of Energy Research, 2021

The main purpose of this study is to develop a sustainable smart energy management system for the... more The main purpose of this study is to develop a sustainable smart energy management system for the desert climate, which aims to reduce energy expenses, energy consumption, and greenhouse gas (GHG) emissions via finding optimum power output and smart scheduling while considering users' uncertain behaviors. Moreover, the effectiveness of five metaheuristic optimization algorithms is analyzed and reviewed for presented system, which is modeled as a multiobjective function and contains over 1000 variables. The case study is city of Kashan located at the desert area of Iran with hot and dry climate. Presented system is established based on smart residential energy hub and home energy management system. Residential loads for a modern household are appropriately categorized and modelled. Ten different uncertain scenarios for users' energy consumption are simulated within the algorithm with considering users' comfort level simultaneously. Both energy cost and users' comfort deviation for studied multi‐energy system are formulated as a multiobjective function with two weighting factors. Our results present a comparison between different cases studied and the effects of uncertain power consumption on energy cost, comfort level, and computing time. Our findings indicate that the presented system with specified weighting factors is able to reduce energy expenses around 50% in different cases. Accordingly, due to a noticeable decrease in energy consumption, GHG emissions from fossil fuels are reduced remarkably considering the fact that only 1% of Iran's power supply is provided by clean energies. Results also illustrate that considering uncertainty has more effect on users' comfort level than energy cost.

Sustainable Energy Technologies and Assessments, 2021

Sustainable Energy Technologies and Assessments, 2021

Abstract The development of renewable energy systems could be facilitated by appropriate energy p... more Abstract The development of renewable energy systems could be facilitated by appropriate energy policies according to the recognition of major barriers. Iran, with over 1,648,000 sq. km of suitable area and 300 sunny days per year, and over 2200 kWh/m2 of irradiation, has one of the highest potentials for utilization of solar energy on the planet. However, achieving the goals of renewable energy development based on Iranian roadmaps encounters various barriers. On the other hand, there is a research gap for conducting a comprehensive study by considering multiple-criteria decision-making (MCDM) methods and qualitative methods under uncertainty in investigating the barriers of photovoltaic developments. By combining Fuzzy MCDM methods and qualitative analysis ones, this study aims to respond to this research gap, particularly for the barriers facing Iran’s photovoltaic energy production development. This paper assesses the barriers based on Fuzzy analytic hierarchy process (Fuzzy-AHP) techniques. The Fuzzy-TOPSIS method is also used to determine how it is possible to overcome the challenges. The results imply that “messy economic situation” and “ineffective bureaucracy” are the most barriers hampering the development of photovoltaic energy production in Iran. Moreover, “Economic and financial incentives” and “mitigating bureaucratic efforts for permission approval” are the most effective solutions.

2020 6th International Conference on Electric Power and Energy Conversion Systems (EPECS), 2020

Using state of the art, which is Solar trailer, a cost-effective and efficient way to provide mic... more Using state of the art, which is Solar trailer, a cost-effective and efficient way to provide microgrid power for reducing shortages of the vulnerable population is presented. In this paper, the optimal design for a portable solar trailer is discussed in detail. Indeed, the energy is stored in a solar trailer employing some solar photovoltaic (PV) modules as well as diesel generator which can then be exploited to supply the required power in Battery energy storage (BES) to be used in providing medicines refrigeration, water treatment, and connecting to the web network. Employing HOMER software, the optimum system has been achieved and designed. Once the optimized system obtained in HOMER the interested solar trailer was designed in CATIA and prepared for production, based optimization results. It is worth mentioning that this optimum system is based on climatic conditions as well as the basic needs of the vulnerable community. The final proposed solar trailer in this paper incorporates one refrigerator, a water treatment device, eight solar panels of 400 W type, 12 batteries, a 4-kW generator.

Thermal Science, 2019

Heat transfer and pressure drop are numerically investigated for turbulent flows through a hexago... more Heat transfer and pressure drop are numerically investigated for turbulent flows through a hexagonal fuel rod bundle. For the purpose of numerical analysis, the geometric and boundary conditions were taken from the VVER-1000. Since VVER-1000 does not have mixing vane on the grid spacer of the fuel assembly, split mixing vane is designed to boost turbulent flow and heat transfer in the rod bundle subchannels. The computational domain including two grid spacers extend from 100 ? Dh upstream of the first grid spacer to 250 ? Dh downstream of the second grid spacer. The steady-state form of the RANS, mass, energy and turbulence equations was discretized and solved using ANSYS-CFX. The standard k-? model is employed to simulate turbulence. The results show a considerable increase in the average heat transfer to ~10 ? Dh downstream of the grid spacer using the mixing vane on the grid spacer of VVER type reactor. As expected, the pressure loss through the grid spacer also increased slightl...

Review of Scientific Instruments, 2016

Since the mean characteristic of nucleate boiling is bubble formation and collapse near the heati... more Since the mean characteristic of nucleate boiling is bubble formation and collapse near the heating surface, in this study attempts have been made to investigate heat transfer effects due to the bubbles ebullition and collapse cycle. All possible heat transfer mechanisms are studied qualitatively and quantitatively. For quantitative calculation of the heat transfer portion by each of the introduced mechanisms, a series of bubble parameters was selected from the experimental data provided by the high-speed photography of a heated rod containing nucleate boiling regime on its surface. According to the present results, the portion of the mechanisms such as latent heat transfer, super heated layer mixing and single-phase heat transfer are between 6~15%, 12~17%, and 3~5%, respectively. The results also show that the two mechanisms of the turbulence induced by the bubble formation and collapse and quenching have the main performance in transferring heat from the heating surface to the bul...

ASME 2011 Small Modular Reactors Symposium, 2011

This paper is aimed at understanding thermohydrodynamic and neutronic characteristics of nanoflui... more This paper is aimed at understanding thermohydrodynamic and neutronic characteristics of nanofluids for prospective application to water cooled small modular reactors. Numerical analysis is performed to investigate turbulent convective heat transfer and flow features of Al2O3 nanofluids as working fluid. The Al2O3-water nanofluids of 1%, 4% and 6% by volume have been employed for the numerical simulation resorting to the homogenous fluid assumptions with modified thermophysical properties. Results indicate that the heat transfer increases with nanoparticle volume concentrations by 4.2%–31% as compared against that for pure water. The maximum heat transfer increase at the center of a subchannel formed by fuel rods is 31.29% for the particle volume concentration of 6% corresponding to the Reynolds number of 65,000. It consequently appears promising enough to use nanofluids in small modular reactors. Neutronic and thermohydrodynamic investigations are further needed to streamline the n...

Radiation Protection Dosimetry, 2012

A Joint Automatic Dispenser Equipment (JADE) has been designed and fabricated for automatic withd... more A Joint Automatic Dispenser Equipment (JADE) has been designed and fabricated for automatic withdrawal and calibration of radiopharmaceutical materials. The thermoluminescent dosemeter procedures have shown a reduction in dose to the technician's hand with this novel dose dispenser system JADE when compared with the manual withdrawal of (99m)Tc. This system helps to increase the precision of calibration and to minimise the radiation dose to the hands and body of the workers. This paper describes the structure of this device, its function and user-friendliness, and its efficacy. The efficacy of this device was determined by measuring the radiation dose delivered to the hands of the nuclear medicine laboratory technician. The user-friendliness of JADE has been examined. The automatic withdrawal and calibration offered by this system reduces the dose to the technician's hand to a level below the maximum permissible dose stipulated by the international protocols. This research will serve as a backbone for future study about the safe use of ionising radiation in medicine.

Radiation Protection Dosimetry, 2012

A real-time automatic dose dispenser (RADD) has been designed and fabricated for automatic withdr... more A real-time automatic dose dispenser (RADD) has been designed and fabricated for automatic withdrawal and calibration of diagnostic radiopharmaceuticals such as those labelled with (99m)Tc. This system enhances the accuracy and precision of activity measurements and reduces personal radiation exposure. The structure, function, user-friendliness and performance of this device are described and examined for diagnostic activities of (99m)Tc ranging from 50 to 650 MBq. The results show that the RADD minimises the likelihood of miscalibration of radiopharmaceuticals due to human error and results in significantly reduced variability (i.e. higher precision) in dispensed activities of radiopharmaceuticals.