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Dr. Pouyan Talebizadehsardari
University of Nottingham

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0 Multiphase Flow
0 Solar Energy
0 CFD
0 phase change material
0 geothermal energy

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phase change material
Energy Storage and Application
CFD
Solar Energy
Computational Fluid Dynamics
Particle Deposition
geothermal energy
Multiphase Flow

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Journal article
Published: 02 August 2021 in Applied Thermal Engineering
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Numerical investigations of the melting/solidification in a metal foam saturated with phase change material (PCM) were performed for simultaneous and consecutive operational modes. The composite is embedded in a rectangular compound cooled by passing air in a middle channel which is then employed to heat the room as a space heater. The composite is heated by two-rod heating elements to store thermal energy for peak-shaving purposes. The study covered the evaluation of the system in different operational modes for charging and discharging rate, the impacts of the metal foam and the influence of coolant flow rate on the solidification performance. The presence of PCM on one hand due to having almost constant temperature during the phase change process and the use of metal foam on the other hand due to proving high heat transfer rate from the PCM to the coolant, help in providing a uniform output temperature from the system which is a key factor for highly efficient space heaters. Moreover, evaluation of the operational modes can help to understand the behavior of the system in real scenarios when there is a need to charge the storage system and heat the room (discharging) simultaneously. The results show that the melting process is fully achieved due to the faster-charging process rate in modes I (8-hour charging and 8-hour discharging separately) and III (2-hour charging and 14-hour simultaneous charging-discharging), compared with mode II (2-hour charging and 2-hour discharging separately, repeated for 16 h). The temperature distribution in Mode III was more constant, which produced uniform heat exchanged between the PCM and the cooling fluid. The porosity is inversely proportional to the liquid development rate. The PCM melts entirely within 6.5 h for 90% porosity while 78% of the PCM melts in 8 h for the 95% porosity case. The final mean PCM temperature changed from 69.9 °C to 66.4 °C, when the air flow rate increases from 0.01 kg/s to 0.03 kg/s.

ACS Style

Jasim M. Mahdi; Hayder I. Mohammed; Pouyan Talebizadehsardari; Mohammad Ghalambaz; Hasan Sh. Majdi; Afrasyab Khan; Wahiba Yaïci; Donald Giddings. Simultaneous and consecutive charging and discharging of a PCM-based domestic air heater with metal foam. Applied Thermal Engineering 2021, 197, 117408 .

AMA Style

Jasim M. Mahdi, Hayder I. Mohammed, Pouyan Talebizadehsardari, Mohammad Ghalambaz, Hasan Sh. Majdi, Afrasyab Khan, Wahiba Yaïci, Donald Giddings. Simultaneous and consecutive charging and discharging of a PCM-based domestic air heater with metal foam. Applied Thermal Engineering. 2021; 197 ():117408.

Chicago/Turabian Style

Jasim M. Mahdi; Hayder I. Mohammed; Pouyan Talebizadehsardari; Mohammad Ghalambaz; Hasan Sh. Majdi; Afrasyab Khan; Wahiba Yaïci; Donald Giddings. 2021. "Simultaneous and consecutive charging and discharging of a PCM-based domestic air heater with metal foam." Applied Thermal Engineering 197, no. : 117408.

Preprint content
Published: 16 July 2021
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ACS Style

Wahiba Yaici; Evgueniy Entchev; Pouyan Talebizadeh Sardari. Performance Investigation of Solar Organic Rankine Cycle Systems With and Without Regeneration and With Zeotropic Working Fluid Mixtures for Use in Micro-Cogeneration. 2021, 1 .

AMA Style

Wahiba Yaici, Evgueniy Entchev, Pouyan Talebizadeh Sardari. Performance Investigation of Solar Organic Rankine Cycle Systems With and Without Regeneration and With Zeotropic Working Fluid Mixtures for Use in Micro-Cogeneration. . 2021; ():1.

Chicago/Turabian Style

Wahiba Yaici; Evgueniy Entchev; Pouyan Talebizadeh Sardari. 2021. "Performance Investigation of Solar Organic Rankine Cycle Systems With and Without Regeneration and With Zeotropic Working Fluid Mixtures for Use in Micro-Cogeneration." , no. : 1.

Journal article
Published: 15 June 2021 in Nanomaterials
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The hydrothermal performance of multiple semi-twisted tape inserts inside a heat exchanger pipe is numerically examined in three-dimensions. This study aims to find the optimum case for having the highest heat transfer enhancement with the lowest friction factor using nanofluid (Al2O3/water). A performance evaluation criterion (PEC) is defined to characterize the performance based on both friction factor and heat transfer. It was found that increasing the number of semi-twisted tapes increases the number of swirl flow streams and leads to an enhancement in the local Nusselt number as well as the friction factor. The average Nusselt number increases from 15.13 to 28.42 and the average friction factor enhances from 0.022 to 0.052 by increasing the number of the semi-twisted tapes from 0 to 4 for the Reynolds number of 1000 for the base fluid. By using four semi-twisted tapes, the average Nusselt number increases from 12.5 to 28.5, while the friction factor reduces from 0.155 to 0.052 when the Reynolds number increases from 250 to 1000 for the base fluid. For the Reynolds number of 1000, the increase in nanofluid concentration from 0 to 3% improves the average Nusselt number and friction factor by 6.41% and 2.29%, respectively. The highest PEC is equal to 1.66 and belongs to the Reynolds number of 750 using four semi-twisted tape inserts with 3% nanoparticles. This work offers instructions to model an advanced design of twisted tape integrated with tubes using multiple semi-twisted tapes, which helps to provide a higher amount of energy demand for solar applications.

ACS Style

Yongfeng Ju; Tiezhu Zhu; Ramin Mashayekhi; Hayder Mohammed; Afrasyab Khan; Pouyan Talebizadehsardari; Wahiba Yaïci. Evaluation of Multiple Semi-Twisted Tape Inserts in a Heat Exchanger Pipe Using Al2O3 Nanofluid. Nanomaterials 2021, 11, 1570 .

AMA Style

Yongfeng Ju, Tiezhu Zhu, Ramin Mashayekhi, Hayder Mohammed, Afrasyab Khan, Pouyan Talebizadehsardari, Wahiba Yaïci. Evaluation of Multiple Semi-Twisted Tape Inserts in a Heat Exchanger Pipe Using Al2O3 Nanofluid. Nanomaterials. 2021; 11 (6):1570.

Chicago/Turabian Style

Yongfeng Ju; Tiezhu Zhu; Ramin Mashayekhi; Hayder Mohammed; Afrasyab Khan; Pouyan Talebizadehsardari; Wahiba Yaïci. 2021. "Evaluation of Multiple Semi-Twisted Tape Inserts in a Heat Exchanger Pipe Using Al2O3 Nanofluid." Nanomaterials 11, no. 6: 1570.

Journal article
Published: 08 June 2021 in International Journal of Thermal Sciences
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Numerical simulation is performed to evaluate the privilege of inserting stationary or rotating twisted tape inside a tube as a heat transfer enhancement technique. The main emphasis of this work is placed on understanding the effect of pitch distance on the hydrothermal performance of such a system. The obtained results are validated with published experimental findings. The results of numerical study shows that the heat transfer, pressure drop and total energy consumption are increased by inserting a twisted tape inside a tube. Under the stationary condition, decreasing the pitch distance results in higher Nusselt number together with more friction factor. As the twisted tape starts to rotate (RTT1 case), both Nusselt number and friction factor are further increased. However, decreasing the pitch distance from L/2 to L/6 exhibits a marginal impact on the Nusselt number and friction factor. Further increase in the angular velocity (RTT3 case), although improved the average Nusselt number, comes at the expense of much more friction factor as well as energy consumption. Considering performance evaluation criterion (PEC) as a metric to assess the interaction between heat transfer and energy consumption, it is found that rotating twisted tape is beneficial at lower Reynolds number. Among the design parameters analysed in this research, the highest PEC number of 1.5 corresponds to the case of stationary twisted tape at Reynolds number of 1000 and twisted tape pitch of L/6.

ACS Style

Hossein Arasteh; Alireza Rahbari; Ramin Mashayekhi; Amir Keshmiri; Roohollah Babaei Mahani; Pouyan Talebizadehsardari. Effect of pitch distance of rotational twisted tape on the heat transfer and fluid flow characteristics. International Journal of Thermal Sciences 2021, 170, 106966 .

AMA Style

Hossein Arasteh, Alireza Rahbari, Ramin Mashayekhi, Amir Keshmiri, Roohollah Babaei Mahani, Pouyan Talebizadehsardari. Effect of pitch distance of rotational twisted tape on the heat transfer and fluid flow characteristics. International Journal of Thermal Sciences. 2021; 170 ():106966.

Chicago/Turabian Style

Hossein Arasteh; Alireza Rahbari; Ramin Mashayekhi; Amir Keshmiri; Roohollah Babaei Mahani; Pouyan Talebizadehsardari. 2021. "Effect of pitch distance of rotational twisted tape on the heat transfer and fluid flow characteristics." International Journal of Thermal Sciences 170, no. : 106966.

Journal article
Published: 20 May 2021 in Solar Energy
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Employing PCMs for thermal management of photovoltaic modules (PVs) is reported as a cost-effective, sustainable approach to overcome the decline in PV conversion efficiency at high operating temperatures. Based on a new arrangement, this study examines the use of multiple PCMs of different melting temperatures to remarkably provide longer thermal management durations in PVs. The idea is to arrange the multiple PCMs in a way that their melting points be decreasing along the heat flow direction so that more uniform temperature of PV module with a lower melting rate of the multiple PCMs is achieved. This facilitates longer thermal management by PCMs so higher power output from the PV module is produced. The results based on numerical simulation show that the use of multiple PCMs based on the proposed arrangement can increase the PCM melting time and prolong the PV thermal-management duration by up to 18% and 33% respectively, depending on the PV inclination and the number of multiple PCMs in use. Also, employing combinations having higher numbers of multiple PCMs with appropriate thermophysical properties and/or lower PV inclination angles significantly improves the thermal management potential of PCM component and substantially lengthen the PV thermal regulation time.

ACS Style

Jasim M. Mahdi; Hayder I. Mohammed; Pouyan Talebizadehsardari. A new approach for employing multiple PCMs in the passive thermal management of photovoltaic modules. Solar Energy 2021, 222, 160 -174.

AMA Style

Jasim M. Mahdi, Hayder I. Mohammed, Pouyan Talebizadehsardari. A new approach for employing multiple PCMs in the passive thermal management of photovoltaic modules. Solar Energy. 2021; 222 ():160-174.

Chicago/Turabian Style

Jasim M. Mahdi; Hayder I. Mohammed; Pouyan Talebizadehsardari. 2021. "A new approach for employing multiple PCMs in the passive thermal management of photovoltaic modules." Solar Energy 222, no. : 160-174.

Journal article
Published: 20 April 2021 in Applied Thermal Engineering
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Due to the remarkable energy savings, isothermal nature of the operation and low costs, energy storage with phase-change materials (PCMs) is a reliable technology for filling the gap between energy supply and demand. In this paper, an attempt has been made to modify the storage functionality of PCM in a plate type heat exchanger with zigzag configuration. A two-dimensional, time-dependent simulation model for the PCM phase transition during the charging and discharging modes has been developed and validated via earlier related findings. The effects of zigzag angle orientation, inlet flowrate and mean temperature of the heat transfer fluid (HTF) are thoroughly studied and revealed. Results show that increasing the angle of zigzag orientation has no noticeable impact on the development of phase transition during the early stages of operation. However, this effect becomes more noticeable and almost leads to faster storage/retrieval rates as time further elapses. It is found that the system with the zigzag angle of 60° augments the storage rate by 32.6% compared with the system of 30° zigzag angle. Also, higher HTF temperature and/or higher Reynold number result in faster phase-transition rates during both parts of the energy charging-discharging cycle.

ACS Style

Pouyan Talebizadehsardari; Jasim M. Mahdi; Hayder I. Mohammed; M.A. Moghimi; Amir Hossein Eisapour; Mohammad Ghalambaz. Consecutive charging and discharging of a PCM-based plate heat exchanger with zigzag configuration. Applied Thermal Engineering 2021, 193, 116970 .

AMA Style

Pouyan Talebizadehsardari, Jasim M. Mahdi, Hayder I. Mohammed, M.A. Moghimi, Amir Hossein Eisapour, Mohammad Ghalambaz. Consecutive charging and discharging of a PCM-based plate heat exchanger with zigzag configuration. Applied Thermal Engineering. 2021; 193 ():116970.

Chicago/Turabian Style

Pouyan Talebizadehsardari; Jasim M. Mahdi; Hayder I. Mohammed; M.A. Moghimi; Amir Hossein Eisapour; Mohammad Ghalambaz. 2021. "Consecutive charging and discharging of a PCM-based plate heat exchanger with zigzag configuration." Applied Thermal Engineering 193, no. : 116970.

Technical paper
Published: 12 April 2021 in Journal of the Brazilian Society of Mechanical Sciences and Engineering
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The motion of gravity current is attributed to the difference in density of current and the surrounding environment. If a fluid with a certain density enters the stratified environment so that its density is less than the lower layers and higher than the upper layers, the gravity current would be of intrusive type. Turbidity current is known as an important class of density currents, where the density difference is formed due to the presence of suspended solid particles in the fluid. In this paper, a three-dimensional numerical simulation of stratified intrusive gravity current in the presence of particles is investigated. For this purpose, the open-source OpenFOAM code is implemented for large eddy simulation to model the flow turbulence. According to the obtained results, the addition of particle mass to the intrusive gravity flow in dual symmetric state and flat bed would be followed by reduced velocities of intrusive gravity forward advance and ambient return flow at the bottom of the channel. Moreover, the flow behavior for the case of reverse slopes of 2, 4 and 6° in dual symmetric state in the absence of particles and at a 4° slope in the presence of particles with diameters of 20 and 30 microns has been investigated. Finally, the effect of bed slope on the instability of ambient gravity flow in the absence and presence of particles has explored with the help of local Richardson number. Faster instability in gravity current was achieved as a result of an increase in the bed slope in the absence of particles. Moreover, examining the instability in the 4° bed slope in the presence of particle with diameters of 20 and 30 microns revealed a reduction in local Richardson. Hence, the higher stability of the flow in the presence of particles compared to their absence can be inferred.

ACS Style

Mohammadreza Darabian; Ehsan Khavasi; Arameh Eyvazian; Pouyan Talebizadehsardari. Numerical simulation of stratified intrusive gravity current in three-dimensional state due to the presence of particles using large eddy simulation method. Journal of the Brazilian Society of Mechanical Sciences and Engineering 2021, 43, 1 -26.

AMA Style

Mohammadreza Darabian, Ehsan Khavasi, Arameh Eyvazian, Pouyan Talebizadehsardari. Numerical simulation of stratified intrusive gravity current in three-dimensional state due to the presence of particles using large eddy simulation method. Journal of the Brazilian Society of Mechanical Sciences and Engineering. 2021; 43 (5):1-26.

Chicago/Turabian Style

Mohammadreza Darabian; Ehsan Khavasi; Arameh Eyvazian; Pouyan Talebizadehsardari. 2021. "Numerical simulation of stratified intrusive gravity current in three-dimensional state due to the presence of particles using large eddy simulation method." Journal of the Brazilian Society of Mechanical Sciences and Engineering 43, no. 5: 1-26.

Research article
Published: 24 March 2021 in PLOS ONE
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In the present study, the thermal energy storage of a hot petal tube inside a shell-tube type Thermal Energy Storage (TES) unit was addressed. The shell is filled with the capric acid Phase Change Material (PCM) and absorbs the heat from a hot U-tube petal. The governing equations for the natural convection flow of molten PCM and phase change heat transfer were introduced by using the enthalpy-porosity approach. An automatic adaptive mesh scheme was used to track the melting interface. The accuracy and convergence of numerical computations were also controlled by a free step Backward Differentiation Formula. The modeling results were compared with previous experimental data. It was found that the present adaptive mesh approach can adequately the melting heat transfer, and an excellent agreement was found with available literature. The effect of geometrical designs of the petal tube was investigated on the melting response of the thermal energy storage unit. The phase change behavior was analyzed by using temperature distribution contours. The results showed that petal tubes could notably increase the melting rate in the TES unit compared to a typical circular tube. Besides, the more the petal numbers, the better the heat transfer. Using a petal tube could increase the charging power by 44% compared to a circular tube. The placement angle of the tubes is another important design factor which should be selected carefully. For instance, vertical placement of tubes could improve the charging power by 300% compared to a case with the tubes’ horizontal placement.

ACS Style

S. A. M. Mehryan; Kaamran Raahemifar; Sayed Reza Ramezani; Ahmad Hajjar; Obai Younis; Pouyan Talebizadeh Sardari; Mohammad Ghalambaz. Melting phase change heat transfer in a quasi-petal tube thermal energy storage unit. PLOS ONE 2021, 16, e0246972 .

AMA Style

S. A. M. Mehryan, Kaamran Raahemifar, Sayed Reza Ramezani, Ahmad Hajjar, Obai Younis, Pouyan Talebizadeh Sardari, Mohammad Ghalambaz. Melting phase change heat transfer in a quasi-petal tube thermal energy storage unit. PLOS ONE. 2021; 16 (3):e0246972.

Chicago/Turabian Style

S. A. M. Mehryan; Kaamran Raahemifar; Sayed Reza Ramezani; Ahmad Hajjar; Obai Younis; Pouyan Talebizadeh Sardari; Mohammad Ghalambaz. 2021. "Melting phase change heat transfer in a quasi-petal tube thermal energy storage unit." PLOS ONE 16, no. 3: e0246972.

Research article
Published: 23 March 2021 in International Journal of Energy Research
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A numerical parametric study is presented of a domestic thermal storage heat exchanger to explore the effect of highly localized positive temperature coefficient cylindrical heating elements in a phase change material (PCM) with conductive enhancement by open‐pore metal foam. By using 90 L of commercially available Rubitherm RT70HC wax, 5.7 kWh of thermal energy is captured by the unit. The discharge is via a central convective air channel. The constant low‐temperature heating elements are inherently safe for combustible PCM. The heat distribution by Fourier's law and the creeping flow is investigated using the local thermal equilibrium assumption between the PCM and metal foam. Heating element position, diameter, and temperature are varied to optimize charge time and exit air temperature. Two heating elements of 1 cm diameter and constant temperature of 90°C produce a suitable performance for overnight store charging of 7.23 hours. Discharge via the air channel provides an average temperature of the output air over 30°C. The results indicated that the PCM inside metal foam almost follows Fourier's law. The creeping flow of molten PCM inside the pores of the porous medium (free convection heat effect) has an inconsiderable influence on heat transfer in the domain.

ACS Style

Pouyan Talebizadeh Sardari; Hayder I. Mohammed; Jasim M. Mahdi; Mohammad Ghalambaz; Mark Gillott; Gavin S. Walker; David Grant; Donald Giddings. Localized heating element distribution in composite metal foam‐phase change material: Fourier's law and creeping flow effects. International Journal of Energy Research 2021, 45, 13380 -13396.

AMA Style

Pouyan Talebizadeh Sardari, Hayder I. Mohammed, Jasim M. Mahdi, Mohammad Ghalambaz, Mark Gillott, Gavin S. Walker, David Grant, Donald Giddings. Localized heating element distribution in composite metal foam‐phase change material: Fourier's law and creeping flow effects. International Journal of Energy Research. 2021; 45 (9):13380-13396.

Chicago/Turabian Style

Pouyan Talebizadeh Sardari; Hayder I. Mohammed; Jasim M. Mahdi; Mohammad Ghalambaz; Mark Gillott; Gavin S. Walker; David Grant; Donald Giddings. 2021. "Localized heating element distribution in composite metal foam‐phase change material: Fourier's law and creeping flow effects." International Journal of Energy Research 45, no. 9: 13380-13396.

Journal article
Published: 15 March 2021 in Energies
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A twisted-fin array as an innovative structure for intensifying the charging response of a phase-change material (PCM) within a shell-and-tube storage system is introduced in this work. A three-dimensional model describing the thermal management with charging phase change process in PCM was developed and numerically analyzed by the enthalpy-porosity method using commercial CFD software. Efficacy of the proposed structure of fins for performing better heat communication between the active heating surface and the adjacent layers of PCM was verified via comparing with conventional longitudinal fins within the same design limitations of fin material and volume usage. Optimization of the fin geometric parameters including the pitch, number, thickness, and the height of the twisted fins for superior performance of the proposed fin structure, was also introduced via the Taguchi method. The results show that a faster charging rate, higher storage rate, and better uniformity in temperature distribution could be achieved in the PCMs with Twisted fins. Based on the design of twisted fins, it was found that the energy charging time could be reduced by up to 42%, and the energy storage rate could be enhanced up to 63% compared to the reference case of straight longitudinal fins within the same PCM mass limitations.

ACS Style

Mohammad Ghalambaz; Hayder Mohammed; Jasim Mahdi; Amir Eisapour; Obai Younis; Aritra Ghosh; Pouyan Talebizadehsardari; Wahiba Yaïci. Intensifying the Charging Response of a Phase-Change Material with Twisted Fin Arrays in a Shell-And-Tube Storage System. Energies 2021, 14, 1619 .

AMA Style

Mohammad Ghalambaz, Hayder Mohammed, Jasim Mahdi, Amir Eisapour, Obai Younis, Aritra Ghosh, Pouyan Talebizadehsardari, Wahiba Yaïci. Intensifying the Charging Response of a Phase-Change Material with Twisted Fin Arrays in a Shell-And-Tube Storage System. Energies. 2021; 14 (6):1619.

Chicago/Turabian Style

Mohammad Ghalambaz; Hayder Mohammed; Jasim Mahdi; Amir Eisapour; Obai Younis; Aritra Ghosh; Pouyan Talebizadehsardari; Wahiba Yaïci. 2021. "Intensifying the Charging Response of a Phase-Change Material with Twisted Fin Arrays in a Shell-And-Tube Storage System." Energies 14, no. 6: 1619.

Journal article
Published: 14 March 2021 in Molecules
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A latent heat thermal energy storage (LHTES) unit can store a notable amount of heat in a compact volume. However, the charging time could be tediously long due to weak heat transfer. Thus, an improvement of heat transfer and a reduction in charging time is an essential task. The present research aims to improve the thermal charging of a conical shell-tube LHTES unit by optimizing the shell-shape and fin-inclination angle in the presence of nanoadditives. The governing equations for the natural convection heat transfer and phase change heat transfer are written as partial differential equations. The finite element method is applied to solve the equations numerically. The Taguchi optimization approach is then invoked to optimize the fin-inclination angle, shell aspect ratio, and the type and volume fraction of nanoparticles. The results showed that the shell-aspect ratio and fin inclination angle are the most important design parameters influencing the charging time. The charging time could be changed by 40% by variation of design parameters. Interestingly a conical shell with a small radius at the bottom and a large radius at the top (small aspect ratio) is the best shell design. However, a too-small aspect ratio could entrap the liquid-PCM between fins and increase the charging time. An optimum volume fraction of 4% is found for nanoparticle concentration.

ACS Style

Mohammad Ghalambaz; Hassan Shirivand; Kasra Ayoubloo; S.A.M. Mehryan; Obai Younis; Pouyan Talebizadehsardari; Wahiba Yaïci. The Thermal Charging Performance of Finned Conical Thermal Storage System Filled with Nano-Enhanced Phase Change Material. Molecules 2021, 26, 1605 .

AMA Style

Mohammad Ghalambaz, Hassan Shirivand, Kasra Ayoubloo, S.A.M. Mehryan, Obai Younis, Pouyan Talebizadehsardari, Wahiba Yaïci. The Thermal Charging Performance of Finned Conical Thermal Storage System Filled with Nano-Enhanced Phase Change Material. Molecules. 2021; 26 (6):1605.

Chicago/Turabian Style

Mohammad Ghalambaz; Hassan Shirivand; Kasra Ayoubloo; S.A.M. Mehryan; Obai Younis; Pouyan Talebizadehsardari; Wahiba Yaïci. 2021. "The Thermal Charging Performance of Finned Conical Thermal Storage System Filled with Nano-Enhanced Phase Change Material." Molecules 26, no. 6: 1605.

Journal article
Published: 12 March 2021 in Energies
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The melting of a coconut oil–CuO phase change material (PCM) embedded in an engineered nonuniform copper foam was theoretically analyzed to reduce the charging time of a thermal energy storage unit. A nonuniform metal foam could improve the effective thermal conductivity of a porous medium at regions with dominant conduction heat transfer by increasing local porosity. Moreover, the increase in porosity contributes to flow circulation in the natural convection-dominant regimes and adds a positive impact to the heat transfer rate, but it reduces the conduction heat transfer and overall heat transfer. The Taguchi optimization method was used to minimize the charging time of a shell-and-tube thermal energy storage (TES) unit by optimizing the porosity gradient, volume fractions of nanoparticles, average porosity, and porous pore sizes. The results showed that porosity is the most significant factor and lower porosity has a faster charging rate. A nonuniform porosity reduces the charging time of TES. The size of porous pores induces a negligible impact on the charging time. Lastly, the increase in volume fractions of nanoparticles reduces the charging time, but it has a minimal impact on the TES unit’s charging power.

ACS Style

Mohammad Ghalambaz; S.A.M. Mehryan; Hassan Shirivand; Farshid Shalbafi; Obai Younis; Kiao Inthavong; Goodarz Ahmadi; Pouyan Talebizadehsardari. Simulation of a Fast-Charging Porous Thermal Energy Storage System Saturated with a Nano-Enhanced Phase Change Material. Energies 2021, 14, 1575 .

AMA Style

Mohammad Ghalambaz, S.A.M. Mehryan, Hassan Shirivand, Farshid Shalbafi, Obai Younis, Kiao Inthavong, Goodarz Ahmadi, Pouyan Talebizadehsardari. Simulation of a Fast-Charging Porous Thermal Energy Storage System Saturated with a Nano-Enhanced Phase Change Material. Energies. 2021; 14 (6):1575.

Chicago/Turabian Style

Mohammad Ghalambaz; S.A.M. Mehryan; Hassan Shirivand; Farshid Shalbafi; Obai Younis; Kiao Inthavong; Goodarz Ahmadi; Pouyan Talebizadehsardari. 2021. "Simulation of a Fast-Charging Porous Thermal Energy Storage System Saturated with a Nano-Enhanced Phase Change Material." Energies 14, no. 6: 1575.

Journal article
Published: 11 March 2021 in Heat Transfer Engineering
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Al2O3–water nanofluids along with stationary and rotating twisted tape inserts are used to increase the rate of heat transfer in a plain tube. The simulations are conducted through varying the design parameters including angular velocity of twisted tape, Reynolds number and nanofluid volume concentration. It is found that inserting a twisted tape inside a tube substantially increases the heat transfer coefficient and friction factor compared to the plain tube. Compared to the stationary twisted tape, the rotating twisted tape exhibits a great potential to modify the average Nusselt number by about 32.8–39.6% at Reynolds number of 250, depending on the angular velocity. This is attributed to the formation of conical tornado-shape structures in the flow pattern, causing more effective mixing in the flow. By increasing the Reynolds number, the enhancement in the average Nusselt number increases in stationary and decreases in rotating configurations compared with the plain tube. To assess the tradeoff between heat transfer enhancement and pressure loss penalty, the performance evaluation criterion (PEC) is calculated. The results suggest that the highest PEC is obtained at Reynolds number of 250, nanofluid volume concentration of 3% and the highest studied angular velocity.

ACS Style

Ramin Mashayekhi; Hossein Arasteh; Pouyan Talebizadehsardari; Apurv Kumar; Morteza Hangi; Alireza Rahbari. Heat Transfer Enhancement of Nanofluid Flow in a Tube Equipped with Rotating Twisted Tape Inserts: A Two-Phase Approach. Heat Transfer Engineering 2021, 1 -18.

AMA Style

Ramin Mashayekhi, Hossein Arasteh, Pouyan Talebizadehsardari, Apurv Kumar, Morteza Hangi, Alireza Rahbari. Heat Transfer Enhancement of Nanofluid Flow in a Tube Equipped with Rotating Twisted Tape Inserts: A Two-Phase Approach. Heat Transfer Engineering. 2021; ():1-18.

Chicago/Turabian Style

Ramin Mashayekhi; Hossein Arasteh; Pouyan Talebizadehsardari; Apurv Kumar; Morteza Hangi; Alireza Rahbari. 2021. "Heat Transfer Enhancement of Nanofluid Flow in a Tube Equipped with Rotating Twisted Tape Inserts: A Two-Phase Approach." Heat Transfer Engineering , no. : 1-18.

Journal article
Published: 09 March 2021 in Energies
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The melting flow and heat transfer of copper-oxide coconut oil in thermal energy storage filled with a nonlinear copper metal foam are addressed. The porosity of the copper foam changes linearly from bottom to top. The phase change material (PCM) is filled into the metal foam pores, which form a composite PCM. The natural convection effect is also taken into account. The effect of average porosity; porosity distribution; pore size density; the inclination angle of enclosure; and nanoparticles’ concentration on the isotherms, melting maps, and the melting rate are investigated. The results show that the average porosity is the most important parameter on the melting behavior. The variation in porosity from 0.825 to 0.9 changes the melting time by about 116%. The natural convection flows are weak in the metal foam, and hence, the impact of each of the other parameters on the melting time is insignificant (less than 5%).

ACS Style

Mohammad Ghalambaz; Mohammad Shahabadi; S. Mehryan; Mikhail Sheremet; Obai Younis; Pouyan Talebizadehsardari; Wabiha Yaici. Latent Heat Thermal Storage of Nano-Enhanced Phase Change Material Filled by Copper Foam with Linear Porosity Variation in Vertical Direction. Energies 2021, 14, 1508 .

AMA Style

Mohammad Ghalambaz, Mohammad Shahabadi, S. Mehryan, Mikhail Sheremet, Obai Younis, Pouyan Talebizadehsardari, Wabiha Yaici. Latent Heat Thermal Storage of Nano-Enhanced Phase Change Material Filled by Copper Foam with Linear Porosity Variation in Vertical Direction. Energies. 2021; 14 (5):1508.

Chicago/Turabian Style

Mohammad Ghalambaz; Mohammad Shahabadi; S. Mehryan; Mikhail Sheremet; Obai Younis; Pouyan Talebizadehsardari; Wabiha Yaici. 2021. "Latent Heat Thermal Storage of Nano-Enhanced Phase Change Material Filled by Copper Foam with Linear Porosity Variation in Vertical Direction." Energies 14, no. 5: 1508.

Journal article
Published: 09 March 2021 in Molecules
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A wavy shape was used to enhance the thermal heat transfer in a shell-tube latent heat thermal energy storage (LHTES) unit. The thermal storage unit was filled with CuO–coconut oil nano-enhanced phase change material (NePCM). The enthalpy-porosity approach was employed to model the phase change heat transfer in the presence of natural convection effects in the molten NePCM. The finite element method was applied to integrate the governing equations for fluid motion and phase change heat transfer. The impact of wave amplitude and wave number of the heated tube, as well as the volume concertation of nanoparticles on the full-charging time of the LHTES unit, was addressed. The Taguchi optimization method was used to find an optimum design of the LHTES unit. The results showed that an increase in the volume fraction of nanoparticles reduces the charging time. Moreover, the waviness of the tube resists the natural convection flow circulation in the phase change domain and could increase the charging time.

ACS Style

Mohammad Ghalambaz; S.A.M. Mehryan; Ahmad Hajjar; Mohammad Shdaifat; Obai Younis; Pouyan Talebizadehsardari; Wahiba Yaïci. Thermal Charging Optimization of a Wavy-Shaped Nano-Enhanced Thermal Storage Unit. Molecules 2021, 26, 1496 .

AMA Style

Mohammad Ghalambaz, S.A.M. Mehryan, Ahmad Hajjar, Mohammad Shdaifat, Obai Younis, Pouyan Talebizadehsardari, Wahiba Yaïci. Thermal Charging Optimization of a Wavy-Shaped Nano-Enhanced Thermal Storage Unit. Molecules. 2021; 26 (5):1496.

Chicago/Turabian Style

Mohammad Ghalambaz; S.A.M. Mehryan; Ahmad Hajjar; Mohammad Shdaifat; Obai Younis; Pouyan Talebizadehsardari; Wahiba Yaïci. 2021. "Thermal Charging Optimization of a Wavy-Shaped Nano-Enhanced Thermal Storage Unit." Molecules 26, no. 5: 1496.

Journal article
Published: 07 March 2021 in Sustainability
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The melting heat transfer of nano-enhanced phase change materials was addressed in a thermal energy storage unit. A heated U-shape tube was placed in a cylindrical shell. The cross-section of the tube is a petal-shape, which can have different amplitudes and wave numbers. The shell is filled with capric acid with a fusion temperature of 32 °C. The copper (Cu)/graphene oxide (GO) type nanoparticles were added to capric acid to improve its heat transfer properties. The enthalpy-porosity approach was used to model the phase change heat transfer in the presence of natural convection heat transfer effects. A novel mesh adaptation method was used to track the phase change melting front and produce high-quality mesh at the phase change region. The impacts of the volume fraction of nanoparticles, the amplitude and number of petals, the distance between tubes, and the angle of tube placements were investigated on the thermal energy rate and melting-time in the thermal energy storage unit. An average charging power can be raised by up to 45% by using petal shape tubes compared to a plain tube. The nanoadditives could improve the heat transfer by 7% for Cu and 11% for GO nanoparticles compared to the pure phase change material.

ACS Style

Mohammad Ghalambaz; Seyed Mehryan; Reza Feeoj; Ahmad Hajjar; Obai Younis; Pouyan Talebizadehsardari; Wahiba Yaïci. Effect of the Quasi-Petal Heat Transfer Tube on the Melting Process of the Nano-Enhanced Phase Change Substance in a Thermal Energy Storage Unit. Sustainability 2021, 13, 2871 .

AMA Style

Mohammad Ghalambaz, Seyed Mehryan, Reza Feeoj, Ahmad Hajjar, Obai Younis, Pouyan Talebizadehsardari, Wahiba Yaïci. Effect of the Quasi-Petal Heat Transfer Tube on the Melting Process of the Nano-Enhanced Phase Change Substance in a Thermal Energy Storage Unit. Sustainability. 2021; 13 (5):2871.

Chicago/Turabian Style

Mohammad Ghalambaz; Seyed Mehryan; Reza Feeoj; Ahmad Hajjar; Obai Younis; Pouyan Talebizadehsardari; Wahiba Yaïci. 2021. "Effect of the Quasi-Petal Heat Transfer Tube on the Melting Process of the Nano-Enhanced Phase Change Substance in a Thermal Energy Storage Unit." Sustainability 13, no. 5: 2871.

Journal article
Published: 07 March 2021 in Journal of Energy Storage
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High-temperature metal hydride (MH), such as magnesium hydride, is considered as one of the most promising technology to store hydrogen. However, there are two main bottlenecks, including the low rate of hydrogen absorption and low capacity of the MH reactor. In this regard, heat removal from the MH tank plays a crucial role in the hydrogen storage process. In the present study, to increase the hydrogen absorption performance, a novel configuration of the MH reactor is proposed and simulated using computational fluid dynamics (CFD). The study aims to assess the geometrical parameters of the proposed heat exchanger. Besides, a sensitivity analysis of the operating parameters of the reactor, including the Reynolds number and temperature of the air as well as hydrogen supply pressure is performed. The results indicate that the charging time drops significantly by increasing the number of air passages since the heat transfer rate improves dramatically. By raising the heat transfer fluid initial temperature, the charging time increases; however, as the heat transfer fluid Reynolds number and the inlet pressure of hydrogen increase, the absorption process accelerates. The recommended configuration is introduced by considering both charging time and manufacturing limitations. It is shown that the loading is approximately 30 minutes for the new multi-zone hydrogen energy storage using four passages for the air which provides a more applicable hydrogen fuel system.

ACS Style

Amir Hossein Eisapour; Mehdi Eisapour; Pouyan Talebizadehsardari; Gavin S. Walker. An innovative multi-zone configuration to enhance the charging process of magnesium based metal hydride hydrogen storage tank. Journal of Energy Storage 2021, 36, 102443 .

AMA Style

Amir Hossein Eisapour, Mehdi Eisapour, Pouyan Talebizadehsardari, Gavin S. Walker. An innovative multi-zone configuration to enhance the charging process of magnesium based metal hydride hydrogen storage tank. Journal of Energy Storage. 2021; 36 ():102443.

Chicago/Turabian Style

Amir Hossein Eisapour; Mehdi Eisapour; Pouyan Talebizadehsardari; Gavin S. Walker. 2021. "An innovative multi-zone configuration to enhance the charging process of magnesium based metal hydride hydrogen storage tank." Journal of Energy Storage 36, no. : 102443.

Journal article
Published: 05 March 2021 in Materials
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Utilizing phase change materials in thermal energy storage systems is commonly considered as an alternative solution for the effective use of energy. This study presents numerical simulations of the charging process for a multitube latent heat thermal energy storage system. A thermal energy storage model, consisting of five tubes of heat transfer fluids, was investigated using Rubitherm phase change material (RT35) as the. The locations of the tubes were optimized by applying the Taguchi method. The thermal behavior of the unit was evaluated by considering the liquid fraction graphs, streamlines, and isotherm contours. The numerical model was first verified compared with existed experimental data from the literature. The outcomes revealed that based on the Taguchi method, the first row of the heat transfer fluid tubes should be located at the lowest possible area while the other tubes should be spread consistently in the enclosure. The charging rate changed by 76% when varying the locations of the tubes in the enclosure to the optimum point. The development of streamlines and free-convection flow circulation was found to impact the system design significantly. The Taguchi method could efficiently assign the optimum design of the system with few simulations. Accordingly, this approach gives the impression of the future design of energy storage systems.

ACS Style

Mohammad Ghalambaz; Hayder Mohammed; Ali Naghizadeh; Mohammad Islam; Obai Younis; Jasim Mahdi; Ilia Chatroudi; Pouyan Talebizadehsardari. Optimum Placement of Heating Tubes in a Multi-Tube Latent Heat Thermal Energy Storage. Materials 2021, 14, 1232 .

AMA Style

Mohammad Ghalambaz, Hayder Mohammed, Ali Naghizadeh, Mohammad Islam, Obai Younis, Jasim Mahdi, Ilia Chatroudi, Pouyan Talebizadehsardari. Optimum Placement of Heating Tubes in a Multi-Tube Latent Heat Thermal Energy Storage. Materials. 2021; 14 (5):1232.

Chicago/Turabian Style

Mohammad Ghalambaz; Hayder Mohammed; Ali Naghizadeh; Mohammad Islam; Obai Younis; Jasim Mahdi; Ilia Chatroudi; Pouyan Talebizadehsardari. 2021. "Optimum Placement of Heating Tubes in a Multi-Tube Latent Heat Thermal Energy Storage." Materials 14, no. 5: 1232.

Journal article
Published: 02 March 2021 in Sustainability
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This study aims to assess the effect of adding twisted fins in a triple-tube heat exchanger used for latent heat storage compared with using straight fins and no fins. In the proposed heat exchanger, phase change material (PCM) is placed between the middle annulus while hot water is passed in the inner tube and outer annulus in a counter-current direction, as a superior method to melt the PCM and store the thermal energy. The behavior of the system was assessed regarding the liquid fraction and temperature distributions as well as charging time and energy storage rate. The results indicate the advantages of adding twisted fins compared with those of using straight fins. The effect of several twisted fins was also studied to discover its effectiveness on the melting rate. The results demonstrate that deployment of four twisted fins reduced the melting time by 18% compared with using the same number of straight fins, and 25% compared with the no-fins case considering a similar PCM mass. Moreover, the melting time for the case of using four straight fins was 8.3% lower than that compared with the no-fins case. By raising the fins’ number from two to four and six, the heat storage rate rose 14.2% and 25.4%, respectively. This study presents the effects of novel configurations of fins in PCM-based thermal energy storage to deliver innovative products toward commercialization, which can be manufactured with additive manufacturing.

ACS Style

Mohammad Ghalambaz; Jasim Mahdi; Amirhossein Shafaghat; Amir Eisapour; Obai Younis; Pouyan Talebizadeh Sardari; Wahiba Yaïci. Effect of Twisted Fin Array in a Triple-Tube Latent Heat Storage System during the Charging Mode. Sustainability 2021, 13, 2685 .

AMA Style

Mohammad Ghalambaz, Jasim Mahdi, Amirhossein Shafaghat, Amir Eisapour, Obai Younis, Pouyan Talebizadeh Sardari, Wahiba Yaïci. Effect of Twisted Fin Array in a Triple-Tube Latent Heat Storage System during the Charging Mode. Sustainability. 2021; 13 (5):2685.

Chicago/Turabian Style

Mohammad Ghalambaz; Jasim Mahdi; Amirhossein Shafaghat; Amir Eisapour; Obai Younis; Pouyan Talebizadeh Sardari; Wahiba Yaïci. 2021. "Effect of Twisted Fin Array in a Triple-Tube Latent Heat Storage System during the Charging Mode." Sustainability 13, no. 5: 2685.

Journal article
Published: 26 February 2021 in Energies
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The melting process of a multi-tube’s thermal energy storage system in the existence of free convection effects is a non-linear and important problem. The placement of heated tubes could change the convective thermal circulation. In the present study, the impact of the position of seven heat exchanger tubes was systematically investigated. The energy charging process was numerically studied utilizing liquid fraction and stored energy with exhaustive temperature outlines. The tubes of heat transfer fluid were presumed in the unit with different locations. The unit’s heat transfer behavior was assessed by studying the liquid fraction graphs, streamlines, and isotherm contours. Each of the design factors was divided into four levels. To better investigate the design space for the accounted five variables and four levels, an L16 orthogonal table was considered. Changing the location of tubes could change the melting rate by 28%. The best melting rate was 94% after four hours of charging. It was found that the tubes with close distance could overheat each other and reduce the total heat transfer. The study of isotherms and streamlines showed the general circulation of natural convection flows at the final stage of melting was the most crucial factor in the melting of top regions of the unit and reduces the charging time. Thus, particular attention to the tubes’ placement should be made so that the phase change material could be quickly melted at both ends of a unit.

ACS Style

Mohammad Ghalambaz; Amir Eisapour; Hayder Mohammed; Mohammad Islam; Obai Younis; Pouyan Sardari; Wahiba Yaïci. Impact of Tube Bundle Placement on the Thermal Charging of a Latent Heat Storage Unit. Energies 2021, 14, 1289 .

AMA Style

Mohammad Ghalambaz, Amir Eisapour, Hayder Mohammed, Mohammad Islam, Obai Younis, Pouyan Sardari, Wahiba Yaïci. Impact of Tube Bundle Placement on the Thermal Charging of a Latent Heat Storage Unit. Energies. 2021; 14 (5):1289.

Chicago/Turabian Style

Mohammad Ghalambaz; Amir Eisapour; Hayder Mohammed; Mohammad Islam; Obai Younis; Pouyan Sardari; Wahiba Yaïci. 2021. "Impact of Tube Bundle Placement on the Thermal Charging of a Latent Heat Storage Unit." Energies 14, no. 5: 1289.