Meisam Sadi - Academia.edu (original) (raw)

Papers by Meisam Sadi

Thermal Energy Storage Technologies for Sustainability, 2014

Journal of Cleaner Production, 2018

Concentrating solar power plant will be a key component of the future energy systems in which the... more Concentrating solar power plant will be a key component of the future energy systems in which the share of renewable energy is extremely high. A major challenge of this technology is, however, its intermittent power output, slowing down its rate of implementation in the global energy matrix. As such, waste incineration is a popular technology in the developed countries as a smart measure for the disposal of municipal waste and generating free energy. In this study, a hybrid configuration of a concentrating solar power plant accompanied with a waste incineration unit is proposed. In the proposed system, the waste incinerator offers a variable heating duty in order to regulate the power output of the concentrating solar power plant. The hybrid plant is designed for a case study in Denmark and is thermodynamically analyzed. The results of the simulations are presented and discussed. It is shown that the hybrid system can pave the bed for increasing the share of solar thermal power and bringing more waste incinerators to the electricity market. A 10 MWe hybrid power plant may prevent up to 8,000 tonnes of carbon dioxide equivalent emission per month. The overall efficiency of the hybrid system is expected to be 24%.

Sustainable Energy Technologies and Assessments, 2022

2020 IEEE 8th International Conference on Smart Energy Grid Engineering (SEGE), 2020

Every year in hot and arid areas of many developing countries, large amounts of fruits and vegeta... more Every year in hot and arid areas of many developing countries, large amounts of fruits and vegetables spoil due to the lack of appropriate cooling systems. This problem is doubled in areas having low-quality power grids. To use the high-irradiation potential of hot areas, this paper investigates the solar cooling system integrated with the ETCs. This system is considered to provide a maximum of 5 tons of refrigeration for the annual storage of 20 tonnes of tomato. In this regard, solar-driven cooling becomes an effective method to attain sustainability goals including poverty, climate change, and environmental degradation. Due to the intermittency behavior of solar resources, the thermal storage unit is a solution to this defect. Here, an absorption chiller is going to be heated by a storage unit integrated with the evacuated tube collectors. The results show that the absorption chiller can be fully charged throughout the year, requiring a storage tank and a sufficient number of evacuated tube collectors. When six collectors are in the series arrangement and the case of 24 hours of storage, the least number of ETCs are required. The minimum number is 196.

Energy Engineering Management, Nov 10, 2021

Sustainable Energy Technologies and Assessments, 2022

Journal of Energy Storage, 2022

Journal of Cleaner Production, 2022

2019 9th International Conference on Power and Energy Systems (ICPES), 2019

Steam power plants are a major component of almost any energy matrices of the world in all of whi... more Steam power plants are a major component of almost any energy matrices of the world in all of which the share of renewable energy is to higher in the near future. Today, solar energy technologies have become mature and well-popular in many countries, especially well-developed countries, to be an active part of the energy systems. In this study, solar parabolic trough collectors are proposed to provide a bed for increasing the efficiency of a steam power plant. In this system, the solar unit offers a variable heating duty at the highest demand time for the system in order for increasing the power output of the Rankine cycle. The steam power plant is designed for a case study in Denmark. The results of simulations on the performance of the solar-enhanced steam plant are presented and discussed.

Iranian Journal of Chemistry & Chemical Engineering-international English Edition, 2020

Dimensionless temperature, Nusselt number and entropy generation in stagnation flow of incompress... more Dimensionless temperature, Nusselt number and entropy generation in stagnation flow of incompressible nanofluid impinging on the infinite cylinder with uniform suction and blowing have been presented in this study. Initial stream rate of steady free stream is . Similarity solution of Navier-stokes and energy equations has been presented. These equations are simplified implementing appropriate transformations introduced in this research. The governing equations are solved where the heat flux at the cylinder’s wall is constant. All these solutions are acceptable for Reynolds numbers of 0.1-1000, various dimensionless surface diffusion and specific volume fractions of nanoparticles where a is the cylinder radius and is the kinematic viscosity of the base-fluid. The results show that for all Reynolds numbers, diffusion depth of radial and axial components of velocity field and wall shear stress increases as a result of decline in nano particles volume fraction and growth in surface diff...

2020 IEEE 8th International Conference on Smart Energy Grid Engineering (SEGE), 2020

Food and fruit storage is one of the ways to deal with problems such as poverty and environmental... more Food and fruit storage is one of the ways to deal with problems such as poverty and environmental degradation. This paper addresses this issue with the aid of renewable energy. To make the cold storage process an environmentally friendly one, it is proposed that solar thermal energy is implemented. In applications with the aid of solar energy, the production does not match the consumption variations, and hence, storing solar heat would be a solution. One way to store solar energy is through the use of storage tanks. The purpose of this paper is to provide cold storage for storing 20 tonnes of potato, by applying FPCs and storage tanks. There is a maximum cooling load of five-tone of refrigeration. A storage tank is required to supply the heat demand of the chiller. Different collector arrangement is considered to be investigated. The results show that for an increase of 12 hours of storage, the number of collectors increases by 10%. The lowest number of collectors was obtained for 24 hours of storage and a 6-series collector configuration. The highest number of collectors was achieved for 72 hours of storage, with a 12-series collector configuration. The results also show that as the storage time increases, more collectors are required to support the absorption chiller.

In this study, by employing solar parabolic trough collectors, the supply of the thermal energy d... more In this study, by employing solar parabolic trough collectors, the supply of the thermal energy demand of an absorption chiller, as well as a portion of the local district heating demand, is proposed for a case study. The case study already uses the local district heating system to support the chiller which makes problems during the warm months of the year. The results show that the system totally resolves the technical problem of the case study, offers a great contribution to providing the district heating demand and leads to a more favorable economic index compared to the old design. It is observed that the heat demand of chiller is zero for one-third of the year. For a quarter of the year, the system feeds district heating over 1 MW heat and the IRR value of the system is 5.7% for 8 years of operation.

PCM-based thermal energy storage in conjunction with an electric air-source offered as a potentia... more PCM-based thermal energy storage in conjunction with an electric air-source offered as a potential tool to support domestic energy demand reduction while at the same time minimising supply challenges for the electricity utilities. This study is to advance the use of hybrid ventilation concepts in building design by assessment of PCM storage unit with an operation of evaporative ventilation system. RSM CCD methods was employed to evaluate and optimize individual/interactive effect of parameters on cooling efficiency of proposed system. Optimization results indicates that maximum efficiecny can be achieved when inlet air temperature and velocity of 28 oC and 1.2 m/s when PCM coils number was set to 28, respectively. This research compared the effectiveness of passive and free cooling application of PCM when applied to a duplex brick veneer building in Melbourne. It was observed that during the studied period, free cooling application method is more effective than passive application m...

The future energy system is based on a high contribution of renewable energy while stochastic flu... more The future energy system is based on a high contribution of renewable energy while stochastic fluctuations of the main renewable energy sources, i.e. solar and wind, is the main challenge for further implementation of such technologies. In addition, waste incineration is a key component of most European countries’ energy matrix for base load heat or power supply. In this study, a steam power plant is proposed in which the heat demand is supplied by a hybrid system including a parabolic trough solar collector array and a waste incineration unit. The proposed hybrid power plant provides a uniform power production profile, making the produced intermittent solar energy well dispatchable, energy-efficient and cost-effective. The proposed plant is designed, sized and analyzed over an entire year of operation in a case study in Denmark. The results of the simulations of the system are presented and discussed.

Energy, 2020

Abstract This is quite common to supply the heating demand of absorption chillers via the local d... more Abstract This is quite common to supply the heating demand of absorption chillers via the local district heating system. This can be technically challenging during summer when the district heating system does not have enough load to take advantage of the high-temperature discharged flow from the absorption machine. In this study, employing parabolic trough solar collectors for the co-supply of a major heating demand of the chiller and district heating network is proposed. As the expansion of district heating systems for the newly built areas is mainly implemented in lower supply temperatures, the proposed solution works more cost-effective for such cases. The proposed solution is thermodynamically analyzed for an entire year in a case study. The results show that the system totally resolves the technical problem of the case study, offers a significant contribution to supply the district heating demand and presents an impressively better economic index compared to the conventional configuration. Results show that heat demand of the chiller is zero for one-third of the year, the system feeds district heating with a heat supply rate of over 1 MW for about three months, and the internal rate of return of the system is 5.7% for 8 years of operation.

International Journal of Refrigeration, 2014

ABSTRACT In order to enhance the Ranque-Hilsch Vortex Tube (RHVT) performance, an improved design... more ABSTRACT In order to enhance the Ranque-Hilsch Vortex Tube (RHVT) performance, an improved design of a Vortex Tube (VT) is introduced here. The new design of the VT which called Annular Vortex Tube (AVT) is experimentally tested and compared with a similar design RHVT. The hot stream, after passing the hot conical valve, redirected along the outer wall of hot tube in the AVT. This increases heat lost from outer wall of the hot tube. Results show that AVT has higher thermal separation performance comparing to RHVT. For optimum cold mass fraction, AVT improves cooling efficiency about 24% comparing to RHVT. The conical valve angle has also no effect on thermal performance of AVT. For AVT, three vortex generators are tested with different nozzle areas. All vortex generators have the same coefficient of performance in heating while vortex generator with higher nozzle area ratio represents better cooling efficiency among the others.

Energy, 2014

The effect of vortex generator parameters (Cold orifice angle, Cold orifice diameter and Nozzle a... more The effect of vortex generator parameters (Cold orifice angle, Cold orifice diameter and Nozzle area) on vortex tube performance is investigated experimentally. Vortex tube is connected to a natural gas pipeline with constant pressure of 4 bars. To improve vortex tube efficiency, six generators with different cold orifice angle, five generators with different cold orifice diameter and three generators with different nozzle area are studied for each experiment part. Results show variation of nozzle area has no effect on optimum cold mass fraction while cold mass angle and cold mass diameter move this point. Increment in cold orifice diameter increases optimum cold mass fraction and decreases cold temperature. As the angle of cold orifice increases, more mass flow passes through cold outlet and optimum cold mass fraction also increases. The expansion of the gas in the diffuser type cold orifice is investigated as the dominating reason for the different vortex tube performance. These mentioned designing parameters of vortex generator affect the flow pattern and efficiency of vortex tube as a consequence. For cold orifice angle of 4.1 , cold orifice ratio of 0.64 and nozzle area ratio of 0.14, highest efficiency is achieved.

Thermal Energy Storage Technologies for Sustainability, 2014

Journal of Cleaner Production, 2018

Concentrating solar power plant will be a key component of the future energy systems in which the... more Concentrating solar power plant will be a key component of the future energy systems in which the share of renewable energy is extremely high. A major challenge of this technology is, however, its intermittent power output, slowing down its rate of implementation in the global energy matrix. As such, waste incineration is a popular technology in the developed countries as a smart measure for the disposal of municipal waste and generating free energy. In this study, a hybrid configuration of a concentrating solar power plant accompanied with a waste incineration unit is proposed. In the proposed system, the waste incinerator offers a variable heating duty in order to regulate the power output of the concentrating solar power plant. The hybrid plant is designed for a case study in Denmark and is thermodynamically analyzed. The results of the simulations are presented and discussed. It is shown that the hybrid system can pave the bed for increasing the share of solar thermal power and bringing more waste incinerators to the electricity market. A 10 MWe hybrid power plant may prevent up to 8,000 tonnes of carbon dioxide equivalent emission per month. The overall efficiency of the hybrid system is expected to be 24%.

Sustainable Energy Technologies and Assessments, 2022

2020 IEEE 8th International Conference on Smart Energy Grid Engineering (SEGE), 2020

Every year in hot and arid areas of many developing countries, large amounts of fruits and vegeta... more Every year in hot and arid areas of many developing countries, large amounts of fruits and vegetables spoil due to the lack of appropriate cooling systems. This problem is doubled in areas having low-quality power grids. To use the high-irradiation potential of hot areas, this paper investigates the solar cooling system integrated with the ETCs. This system is considered to provide a maximum of 5 tons of refrigeration for the annual storage of 20 tonnes of tomato. In this regard, solar-driven cooling becomes an effective method to attain sustainability goals including poverty, climate change, and environmental degradation. Due to the intermittency behavior of solar resources, the thermal storage unit is a solution to this defect. Here, an absorption chiller is going to be heated by a storage unit integrated with the evacuated tube collectors. The results show that the absorption chiller can be fully charged throughout the year, requiring a storage tank and a sufficient number of evacuated tube collectors. When six collectors are in the series arrangement and the case of 24 hours of storage, the least number of ETCs are required. The minimum number is 196.

Energy Engineering Management, Nov 10, 2021

Sustainable Energy Technologies and Assessments, 2022

Journal of Energy Storage, 2022

Journal of Cleaner Production, 2022

2019 9th International Conference on Power and Energy Systems (ICPES), 2019

Steam power plants are a major component of almost any energy matrices of the world in all of whi... more Steam power plants are a major component of almost any energy matrices of the world in all of which the share of renewable energy is to higher in the near future. Today, solar energy technologies have become mature and well-popular in many countries, especially well-developed countries, to be an active part of the energy systems. In this study, solar parabolic trough collectors are proposed to provide a bed for increasing the efficiency of a steam power plant. In this system, the solar unit offers a variable heating duty at the highest demand time for the system in order for increasing the power output of the Rankine cycle. The steam power plant is designed for a case study in Denmark. The results of simulations on the performance of the solar-enhanced steam plant are presented and discussed.

Iranian Journal of Chemistry & Chemical Engineering-international English Edition, 2020

Dimensionless temperature, Nusselt number and entropy generation in stagnation flow of incompress... more Dimensionless temperature, Nusselt number and entropy generation in stagnation flow of incompressible nanofluid impinging on the infinite cylinder with uniform suction and blowing have been presented in this study. Initial stream rate of steady free stream is . Similarity solution of Navier-stokes and energy equations has been presented. These equations are simplified implementing appropriate transformations introduced in this research. The governing equations are solved where the heat flux at the cylinder’s wall is constant. All these solutions are acceptable for Reynolds numbers of 0.1-1000, various dimensionless surface diffusion and specific volume fractions of nanoparticles where a is the cylinder radius and is the kinematic viscosity of the base-fluid. The results show that for all Reynolds numbers, diffusion depth of radial and axial components of velocity field and wall shear stress increases as a result of decline in nano particles volume fraction and growth in surface diff...

2020 IEEE 8th International Conference on Smart Energy Grid Engineering (SEGE), 2020

Food and fruit storage is one of the ways to deal with problems such as poverty and environmental... more Food and fruit storage is one of the ways to deal with problems such as poverty and environmental degradation. This paper addresses this issue with the aid of renewable energy. To make the cold storage process an environmentally friendly one, it is proposed that solar thermal energy is implemented. In applications with the aid of solar energy, the production does not match the consumption variations, and hence, storing solar heat would be a solution. One way to store solar energy is through the use of storage tanks. The purpose of this paper is to provide cold storage for storing 20 tonnes of potato, by applying FPCs and storage tanks. There is a maximum cooling load of five-tone of refrigeration. A storage tank is required to supply the heat demand of the chiller. Different collector arrangement is considered to be investigated. The results show that for an increase of 12 hours of storage, the number of collectors increases by 10%. The lowest number of collectors was obtained for 24 hours of storage and a 6-series collector configuration. The highest number of collectors was achieved for 72 hours of storage, with a 12-series collector configuration. The results also show that as the storage time increases, more collectors are required to support the absorption chiller.

In this study, by employing solar parabolic trough collectors, the supply of the thermal energy d... more In this study, by employing solar parabolic trough collectors, the supply of the thermal energy demand of an absorption chiller, as well as a portion of the local district heating demand, is proposed for a case study. The case study already uses the local district heating system to support the chiller which makes problems during the warm months of the year. The results show that the system totally resolves the technical problem of the case study, offers a great contribution to providing the district heating demand and leads to a more favorable economic index compared to the old design. It is observed that the heat demand of chiller is zero for one-third of the year. For a quarter of the year, the system feeds district heating over 1 MW heat and the IRR value of the system is 5.7% for 8 years of operation.

PCM-based thermal energy storage in conjunction with an electric air-source offered as a potentia... more PCM-based thermal energy storage in conjunction with an electric air-source offered as a potential tool to support domestic energy demand reduction while at the same time minimising supply challenges for the electricity utilities. This study is to advance the use of hybrid ventilation concepts in building design by assessment of PCM storage unit with an operation of evaporative ventilation system. RSM CCD methods was employed to evaluate and optimize individual/interactive effect of parameters on cooling efficiency of proposed system. Optimization results indicates that maximum efficiecny can be achieved when inlet air temperature and velocity of 28 oC and 1.2 m/s when PCM coils number was set to 28, respectively. This research compared the effectiveness of passive and free cooling application of PCM when applied to a duplex brick veneer building in Melbourne. It was observed that during the studied period, free cooling application method is more effective than passive application m...

The future energy system is based on a high contribution of renewable energy while stochastic flu... more The future energy system is based on a high contribution of renewable energy while stochastic fluctuations of the main renewable energy sources, i.e. solar and wind, is the main challenge for further implementation of such technologies. In addition, waste incineration is a key component of most European countries’ energy matrix for base load heat or power supply. In this study, a steam power plant is proposed in which the heat demand is supplied by a hybrid system including a parabolic trough solar collector array and a waste incineration unit. The proposed hybrid power plant provides a uniform power production profile, making the produced intermittent solar energy well dispatchable, energy-efficient and cost-effective. The proposed plant is designed, sized and analyzed over an entire year of operation in a case study in Denmark. The results of the simulations of the system are presented and discussed.

Energy, 2020

Abstract This is quite common to supply the heating demand of absorption chillers via the local d... more Abstract This is quite common to supply the heating demand of absorption chillers via the local district heating system. This can be technically challenging during summer when the district heating system does not have enough load to take advantage of the high-temperature discharged flow from the absorption machine. In this study, employing parabolic trough solar collectors for the co-supply of a major heating demand of the chiller and district heating network is proposed. As the expansion of district heating systems for the newly built areas is mainly implemented in lower supply temperatures, the proposed solution works more cost-effective for such cases. The proposed solution is thermodynamically analyzed for an entire year in a case study. The results show that the system totally resolves the technical problem of the case study, offers a significant contribution to supply the district heating demand and presents an impressively better economic index compared to the conventional configuration. Results show that heat demand of the chiller is zero for one-third of the year, the system feeds district heating with a heat supply rate of over 1 MW for about three months, and the internal rate of return of the system is 5.7% for 8 years of operation.

International Journal of Refrigeration, 2014

ABSTRACT In order to enhance the Ranque-Hilsch Vortex Tube (RHVT) performance, an improved design... more ABSTRACT In order to enhance the Ranque-Hilsch Vortex Tube (RHVT) performance, an improved design of a Vortex Tube (VT) is introduced here. The new design of the VT which called Annular Vortex Tube (AVT) is experimentally tested and compared with a similar design RHVT. The hot stream, after passing the hot conical valve, redirected along the outer wall of hot tube in the AVT. This increases heat lost from outer wall of the hot tube. Results show that AVT has higher thermal separation performance comparing to RHVT. For optimum cold mass fraction, AVT improves cooling efficiency about 24% comparing to RHVT. The conical valve angle has also no effect on thermal performance of AVT. For AVT, three vortex generators are tested with different nozzle areas. All vortex generators have the same coefficient of performance in heating while vortex generator with higher nozzle area ratio represents better cooling efficiency among the others.

Energy, 2014

The effect of vortex generator parameters (Cold orifice angle, Cold orifice diameter and Nozzle a... more The effect of vortex generator parameters (Cold orifice angle, Cold orifice diameter and Nozzle area) on vortex tube performance is investigated experimentally. Vortex tube is connected to a natural gas pipeline with constant pressure of 4 bars. To improve vortex tube efficiency, six generators with different cold orifice angle, five generators with different cold orifice diameter and three generators with different nozzle area are studied for each experiment part. Results show variation of nozzle area has no effect on optimum cold mass fraction while cold mass angle and cold mass diameter move this point. Increment in cold orifice diameter increases optimum cold mass fraction and decreases cold temperature. As the angle of cold orifice increases, more mass flow passes through cold outlet and optimum cold mass fraction also increases. The expansion of the gas in the diffuser type cold orifice is investigated as the dominating reason for the different vortex tube performance. These mentioned designing parameters of vortex generator affect the flow pattern and efficiency of vortex tube as a consequence. For cold orifice angle of 4.1 , cold orifice ratio of 0.64 and nozzle area ratio of 0.14, highest efficiency is achieved.