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Dr. Mehdi Jafarian
Centre for Energy Technology, University of Adelaide, Adelaide 5005, Australia

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0 Energy Management
0 Energy Systems
0 Thermodynamics
0 Transport Phenomena
0 Carbon Capture and Storage

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Chemical looping
Solar thermal energy storage
Energy Systems

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Journal article
Published: 12 February 2020 in Chemical Engineering Science
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A pneumatically-mixed novel configuration of two inter-connected bubble column reactors is reported using air-water to demonstrate the device, enabling circulation of a liquid between the columns solely by a gas-lift mechanism. The new reactor may be used for circulating a high temperature/corrosive liquid between the columns, enabling the cyclical processing of a liquid medium with two different gaseous reactants. The effects of superficial gas velocity, unaerated liquid height in the columns and the diameter of aeration nozzles are discussed with reference to the gas holdup in, and rate of liquid circulation between, the two columns, together with the energetics of circulation. The height of the gas-free liquid in the reactor was found to influence the liquid circulation velocity positively, but the effect of aeration nozzles diameter was marginal. The lowest and highest measured flow rates of circulating water between the columns were 0.7 dm3 min−1 and 4.2 dm3 min−1, respectively.

ACS Style

Mehdi Jafarian; Yusuf Chisti; Graham J. Nathan. Gas-lift circulation of a liquid between two inter-connected bubble columns. Chemical Engineering Science 2020, 218, 115574 .

AMA Style

Mehdi Jafarian, Yusuf Chisti, Graham J. Nathan. Gas-lift circulation of a liquid between two inter-connected bubble columns. Chemical Engineering Science. 2020; 218 ():115574.

Chicago/Turabian Style

Mehdi Jafarian; Yusuf Chisti; Graham J. Nathan. 2020. "Gas-lift circulation of a liquid between two inter-connected bubble columns." Chemical Engineering Science 218, no. : 115574.

Journal article
Published: 05 July 2019 in Energies
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A thermodynamic assessment is conducted for a new configuration of a supercritical water gasification plant with a water–gas shift reactor. The proposed configuration offers the potential for the production of syngas at different H2:CO ratios for various applications such as the Fischer–Tropsch process or fuel cells, and it is a path for addressing the common challenges associated with conventional gasification plants such as nitrogen dilution and ash separation. The proposed concept consists of two reactors, R1 and R2, where the carbon containing fuel is gasified (in reactor R1) and in reactor R2, the quality of the syngas (H2:CO ratio) is substantially improved. Reactor R1 is a supercritical water gasifier and reactor R2 is a water–gas shift reactor. The proposed concept was modelled using the Gibbs minimization method with HSC chemistry software. Our results show that the supercritical water to fuel ratio (SCW/C) is a key parameter for determining the quality of syngas (molar ratio of H2:CO) and the carbon conversion reaches 100%, when the SWC/C ratio ranges between two and 2.5 at 500–1000 °C.

ACS Style

M. M. Sarafraz; Mohammad Reza Safaei; Mehdi Jafarian; Marjan Goodarzi; Maziar Arjomandi. High Quality Syngas Production with Supercritical Biomass Gasification Integrated with a Water–Gas Shift Reactor. Energies 2019, 12, 2591 .

AMA Style

M. M. Sarafraz, Mohammad Reza Safaei, Mehdi Jafarian, Marjan Goodarzi, Maziar Arjomandi. High Quality Syngas Production with Supercritical Biomass Gasification Integrated with a Water–Gas Shift Reactor. Energies. 2019; 12 (13):2591.

Chicago/Turabian Style

M. M. Sarafraz; Mohammad Reza Safaei; Mehdi Jafarian; Marjan Goodarzi; Maziar Arjomandi. 2019. "High Quality Syngas Production with Supercritical Biomass Gasification Integrated with a Water–Gas Shift Reactor." Energies 12, no. 13: 2591.

Journal article
Published: 06 May 2019 in Renewable Energy
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The first systematic experimental study of the combined influences of wind speed (0–9 m/s), aperture ratio (0.33–1) and tilt angle (15°–45°) on the mixed (free and forced) convective heat losses from a heated cavity, is presented. The cylindrical cavity is heated by 16 individually temperature-controlled heating elements in the open section of a wind tunnel. Heat flux distribution and total heat losses from the cavity were measured. A complex inter-dependence was found between aperture ratio, wind speed and convective heat losses. In particular, the total heat losses can vary by up to ∼75% by varying the aperture ratio from 0.33 to 0.75, for no wind condition, but the effect of aperture ratio is decreased as wind speed is increased. The tilt angle was found to have a small effect on the heat losses relative to the aperture ratio and wind speed. Nevertheless, the average minimum mixed heat loss for various wind speeds occurs for a tilt angle of between 15° and 30° for a downward tilting solar tower system.

ACS Style

Ka Lok Lee; Alfonso Chinnici; Mehdi Jafarian; Maziar Arjomandi; Bassam Dally; Graham Nathan. The influence of wind speed, aperture ratio and tilt angle on the heat losses from a finely controlled heated cavity for a solar receiver. Renewable Energy 2019, 143, 1544 -1553.

AMA Style

Ka Lok Lee, Alfonso Chinnici, Mehdi Jafarian, Maziar Arjomandi, Bassam Dally, Graham Nathan. The influence of wind speed, aperture ratio and tilt angle on the heat losses from a finely controlled heated cavity for a solar receiver. Renewable Energy. 2019; 143 ():1544-1553.

Chicago/Turabian Style

Ka Lok Lee; Alfonso Chinnici; Mehdi Jafarian; Maziar Arjomandi; Bassam Dally; Graham Nathan. 2019. "The influence of wind speed, aperture ratio and tilt angle on the heat losses from a finely controlled heated cavity for a solar receiver." Renewable Energy 143, no. : 1544-1553.

Journal article
Published: 20 March 2019 in Journal of Energy Storage
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The reversible reduction and oxidation (RedOx) reactions of CuO/Cu2O, Co3O4/CoO, Mn2O3/Mn3O4, and Pb3O4/PbO have been assessed experimentally with thermogravimetric Analysis (TGA). The temperature was maintained constant during charging and discharging of the thermochemical energy storage via pressure swing for a range of oxygen partial pressures spanning from 0.05 to 0.8 bar. The rate of oxidation reactions were assessed for a range of partial pressures, while changes to the structure of the materials was assessed with X-Ray diffraction spectra (XRD) before and after 10 successive reduction and oxidation cycles. The results show that the Co3O4/CoO, Mn2O3/Mn3O4, and CuO/Cu2O pairs have a potential for chemical storage at temperatures ranges from 900 °C to 1000 °C, while no thermochemical reaction was observed for Pb3O4 up to a temperature of 550 °C.

ACS Style

Mahyar Silakhori; Mehdi Jafarian; Maziar Arjomandi; Graham J. Nathan. Thermogravimetric analysis of Cu, Mn, Co, and Pb oxides for thermochemical energy storage. Journal of Energy Storage 2019, 23, 138 -147.

AMA Style

Mahyar Silakhori, Mehdi Jafarian, Maziar Arjomandi, Graham J. Nathan. Thermogravimetric analysis of Cu, Mn, Co, and Pb oxides for thermochemical energy storage. Journal of Energy Storage. 2019; 23 ():138-147.

Chicago/Turabian Style

Mahyar Silakhori; Mehdi Jafarian; Maziar Arjomandi; Graham J. Nathan. 2019. "Thermogravimetric analysis of Cu, Mn, Co, and Pb oxides for thermochemical energy storage." Journal of Energy Storage 23, no. : 138-147.

Journal article
Published: 12 March 2019 in Applied Thermal Engineering
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An experimental investigation is presented of the effects of wind speed (0 - 9 m/s), yaw angle (0° and 90°), and tilt angle (15° and -90°) on the mixed convective heat losses from a cylindrical cavity heated with different internal wall temperature distributions. The internal wall comprised 16 individually controlled heating elements to allow the distribution of the surface temperature to be well controlled, while the air flow was controlled with a wind tunnel. It is found that temperature distribution has a strong influence on the convective heat losses, with a joint dependence on the wind speed and its direction. For the no-wind and side-on wind conditions, the measured range of the heat losses varied by up to 50% with a change in the wall temperature distribution. However, for high head-on wind speeds, this variation reduced down to ∼20%. In addition, the heat losses from downward tilted were ∼3 times larger than the upward facing heated cavity for high wind speeds (typical of tower-mounted and beam-down configurations, respectively). Also, the measured heat losses were found to be only slightly dependent on wind speed and direction in contrast with the downward tilted cases.

ACS Style

Ka Lok Lee; Alfonso Chinnici; Mehdi Jafarian; Maziar Arjomandi; Bassam Dally; Graham Nathan. The influence of wall temperature distribution on the mixed convective losses from a heated cavity. Applied Thermal Engineering 2019, 155, 157 -165.

AMA Style

Ka Lok Lee, Alfonso Chinnici, Mehdi Jafarian, Maziar Arjomandi, Bassam Dally, Graham Nathan. The influence of wall temperature distribution on the mixed convective losses from a heated cavity. Applied Thermal Engineering. 2019; 155 ():157-165.

Chicago/Turabian Style

Ka Lok Lee; Alfonso Chinnici; Mehdi Jafarian; Maziar Arjomandi; Bassam Dally; Graham Nathan. 2019. "The influence of wall temperature distribution on the mixed convective losses from a heated cavity." Applied Thermal Engineering 155, no. : 157-165.

Journal article
Published: 05 March 2019 in International Journal of Hydrogen Energy
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The thermodynamic potential of a chemical looping gasification with liquid bismuth oxide for the production of syngas was assessed using thermo-chemical analysis. In the proposed process, the feedstock is partially oxidised by the molten bismuth in the gasification reactor and then oxidised with air in the air reactor. The motivation for this process is its potential to avoid both the technical challenges associated with the use of solid oxygen carriers in conventional chemical looping gasification systems (e.g. agglomeration and sintering of solid-state oxygen carrier) and the challenge of dilution of syngas with nitrogen that occurs in conventional air gasification systems. This revealed thermochemical potential to achieve a higher quality of syngas for a given amount of steam than has been reported previously for other gasification systems at a moderate temperature of 850 °C. Plausible approaches to address the research challenges that need to be overcome to implement the method are also identified, justifying further development of the technology.

ACS Style

M.M. Sarafraz; Mehdi Jafarian; M. Arjomandi; G.J. Nathan. The thermo-chemical potential liquid chemical looping gasification with bismuth oxide. International Journal of Hydrogen Energy 2019, 44, 8038 -8050.

AMA Style

M.M. Sarafraz, Mehdi Jafarian, M. Arjomandi, G.J. Nathan. The thermo-chemical potential liquid chemical looping gasification with bismuth oxide. International Journal of Hydrogen Energy. 2019; 44 (16):8038-8050.

Chicago/Turabian Style

M.M. Sarafraz; Mehdi Jafarian; M. Arjomandi; G.J. Nathan. 2019. "The thermo-chemical potential liquid chemical looping gasification with bismuth oxide." International Journal of Hydrogen Energy 44, no. 16: 8038-8050.

Journal article
Published: 04 March 2019 in Solar Energy
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A numerical analysis of the isothermal flow field within a directly irradiated Rotating Fluidized Bed Receiver (RFBR), is presented to provide a systematic assessment of the influence of key receiver control parameters, namely fluidized bed rotational speed and radial fluidizing gas velocity, on the flow field inside the receiver and particle deposition onto the receiver window. To achieve these aims, a Computational Fluid Dynamics (CFD) model of the RFBR was developed and coupled with Discrete Phase Model (DPM) to analyse the fluid flow and particle trajectory in the receiver cavity due to systematic variations in the key control parameters. The fluid flow modelling approach was partially verified by comparing the numerical predictions with previously published experimental flow measurements in a rotating vortex flow device that is geometrically similar to the RFBR. Using the reported modelling approach, the sensitivity of the flow field and particle deposition to the variations in the key control parameters was determined. Flow features and physical mechanisms linked to particle deposition onto the receiver window were identified with the view to better understand the operation of the RFBR and determine suitable operating regimes that achieve a low risk of particle deposition.

ACS Style

Zhao Lu; Alfonso Chinnici; Mehdi Jafarian; Maziar Arjomandi; Graham J. Nathan. Numerical investigation of the isothermal flow field and particle deposition behaviour in a rotating fluidized bed solar receiver. Solar Energy 2019, 182, 348 -360.

AMA Style

Zhao Lu, Alfonso Chinnici, Mehdi Jafarian, Maziar Arjomandi, Graham J. Nathan. Numerical investigation of the isothermal flow field and particle deposition behaviour in a rotating fluidized bed solar receiver. Solar Energy. 2019; 182 ():348-360.

Chicago/Turabian Style

Zhao Lu; Alfonso Chinnici; Mehdi Jafarian; Maziar Arjomandi; Graham J. Nathan. 2019. "Numerical investigation of the isothermal flow field and particle deposition behaviour in a rotating fluidized bed solar receiver." Solar Energy 182, no. : 348-360.

Journal article
Published: 01 March 2019 in Energy
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ACS Style

Mahyar Silakhori; Mehdi Jafarian; Maziar Arjomandi; Graham J. Nathan. The energetic performance of a liquid chemical looping cycle with solar thermal energy storage. Energy 2019, 170, 93 -101.

AMA Style

Mahyar Silakhori, Mehdi Jafarian, Maziar Arjomandi, Graham J. Nathan. The energetic performance of a liquid chemical looping cycle with solar thermal energy storage. Energy. 2019; 170 ():93-101.

Chicago/Turabian Style

Mahyar Silakhori; Mehdi Jafarian; Maziar Arjomandi; Graham J. Nathan. 2019. "The energetic performance of a liquid chemical looping cycle with solar thermal energy storage." Energy 170, no. : 93-101.

Journal article
Published: 28 February 2019 in Solar Energy
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A preliminary assessment of a novel configuration of a solar gas heater is presented that takes advantage of both the high heat transfer rates in the gas-bubbling regime and the outstanding thermo-physical properties of molten metals or their oxides. In this device a gas is injected as bubbles through the submerged nozzles into a bath of heat transfer fluid, into which the cavity is also submerged. This induces turbulence into the molten bath, which augments the rate of heat transfer between the outlet surface of the cavity and the gas. The first-of-a-kind experimental demonstration of this novel concept, using gallium and argon, reports a temperature difference of approximately 10 °C between the cavity and the molten bath. This corresponds to a mean heat transfer rate of more than 3.4 × 103 W/m2 °C. The well-known trade-off between heat transfer and pressure drop overlaps those employed in the highest performing devices reported previously. However, this is expected to be achieved without the same mechanical constraints that can induce high stresses, since the cavity is free to move unconstrained within the bath. Furthermore, many alternative configurations are possible, which offer a different trade-off between heat transfer and pressure drop.

ACS Style

Mehdi Jafarian; Mohammad Reza Abdollahi; Graham J. Nathan. Preliminary evaluation of a novel solar bubble receiver for heating a gas. Solar Energy 2019, 182, 264 -277.

AMA Style

Mehdi Jafarian, Mohammad Reza Abdollahi, Graham J. Nathan. Preliminary evaluation of a novel solar bubble receiver for heating a gas. Solar Energy. 2019; 182 ():264-277.

Chicago/Turabian Style

Mehdi Jafarian; Mohammad Reza Abdollahi; Graham J. Nathan. 2019. "Preliminary evaluation of a novel solar bubble receiver for heating a gas." Solar Energy 182, no. : 264-277.

Journal article
Published: 18 February 2019 in Fuel Processing Technology
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We report an experimental demonstration of the chemical reactions for the chemical looping gasification process using molten bismuth oxide as the oxygen carrier. Cycling of the material without noticeable degradation was shown using a thermo-gravimetric analyser (TGA) furnace through both the reduction of bismuth oxide with carbon and its oxidation with air. The potential for any contamination of liquid bismuth oxide with the alumina container and of any agglomeration was assessed experimentally using x-ray diffraction (XRD) test. A kinetic model was also developed using Kissinger method to estimate the activation energy and the pre-exponential factor for the reduction and the oxidation reactions. It was found that the reduction and oxidation of bismuth and its oxide is feasible at temperatures of approximately 900 °C with the activation energies of 229.4 kJ/mol and 173.6 kJ/mol for the reduction and oxidation reactions, respectively at chemical conversion of 0.7. The chemical conversion of carbon in the presence of bismuth oxide was measured to reach 85% for the partial oxidation of carbon and to reach completion for the complete oxidation of bismuth. Furthermore, no containment challenges for liquid bismuth were identified in the alumina crucible at 900 °C. Hence, the proposed system offers potential to avoid the challenges of sintering and agglomeration that are associated with chemical looping systems using a solid oxygen carrier.

ACS Style

M.M. Sarafraz; M. Jafarian; M. Arjomandi; G.J. Nathan. Experimental investigation of the reduction of liquid bismuth oxide with graphite. Fuel Processing Technology 2019, 188, 110 -117.

AMA Style

M.M. Sarafraz, M. Jafarian, M. Arjomandi, G.J. Nathan. Experimental investigation of the reduction of liquid bismuth oxide with graphite. Fuel Processing Technology. 2019; 188 ():110-117.

Chicago/Turabian Style

M.M. Sarafraz; M. Jafarian; M. Arjomandi; G.J. Nathan. 2019. "Experimental investigation of the reduction of liquid bismuth oxide with graphite." Fuel Processing Technology 188, no. : 110-117.

Journal article
Published: 04 December 2018 in Journal of Energy Storage
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The potential of copper oxide for both thermal energy storage and oxygen production in a liquid chemical looping thermal energy storage system has been assessed with thermogravimetric analysis. Liquid chemical looping thermal energy storage is a recently proposed system with potential to enable both the storage of thermal energy (through sensible heating, phase change and thermochemical reactions) and oxygen production. The process of isothermal reduction and oxidation of molten copper oxide was verified experimentally by heating the material isobarically, reducing or oxidising it isothermally, and then cooling it again isobarically. The isothermal reduction and oxidation reactions were achieved by varying the partial pressure of oxygen through the change in the concentrations of nitrogen and oxygen. This confirmed that copper oxide can be reduced in the liquid state by changing the partial pressure of oxygen in the system. Nevertheless, the extent of reduction in the assessed range of oxygen partial pressure in the liquid phase is approximately 2%, while this value in solid phase is approximately 10%, which implies that the thermochemical storage is mainly occurred in the solid phase. The reduction and oxidation cycles were repeated for 10 cycles. Superimposed on the cyclical weight change was an additional weight loss that was attribute to a side reaction between the copper oxide and alumina crucible.

ACS Style

Mahyar Silakhori; Mehdi Jafarian; Maziar Arjomandi; Graham J. Nathan. Experimental assessment of copper oxide for liquid chemical looping for thermal energy storage. Journal of Energy Storage 2018, 21, 216 -221.

AMA Style

Mahyar Silakhori, Mehdi Jafarian, Maziar Arjomandi, Graham J. Nathan. Experimental assessment of copper oxide for liquid chemical looping for thermal energy storage. Journal of Energy Storage. 2018; 21 ():216-221.

Chicago/Turabian Style

Mahyar Silakhori; Mehdi Jafarian; Maziar Arjomandi; Graham J. Nathan. 2018. "Experimental assessment of copper oxide for liquid chemical looping for thermal energy storage." Journal of Energy Storage 21, no. : 216-221.

Journal article
Published: 14 November 2018 in Solar Energy
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We report a first-order assessment of a novel vortex-based solar particle receiver and the sensitivity of its thermal performance to a number of key operational parameters. This assessment is made with a one-dimensional numerical model developed here to adapt the zonal method to calculate heat and mass transport within the enclosure of the solar vortex receiver (SVR) and to incorporate radiative and convective heat transfer between the particle phase, the air phase and the receiver wall together with re-radiative and conductive loss from the receiver. This simplified one-dimensional model allows for the systematic assessment of first order trends of mass and energy balance within the SVR and is used here to advance understanding of the dominant mechanisms controlling its thermal performance. Sensitivity studies of the thermal performance of the SVR reveal that the receiver can be configured to operate as either an air-heater or a particle-heater, depending primarily on the particle mass loading. For the present SVR configuration, the critical value of mass loading, ṁp/ṁair ≈ 1 was found to define the boundary, above which the device acts as a particle heater, and below which it acts as an air heater. Furthermore, an assessment of the two-phase flow direction found that a counter-flow (relative to the incident concentrated solar radiation) tends to result in a higher efficiency than a co-flow direction. The first order trends of the sensitivity of thermal performance of the SVR to the particle and air mass flow rates, particle size and receiver length were also assessed, finding that the ratio of receiver thermal input to heat capacity of the two-phase flow has a controlling influence on the thermal efficiency of the SVR, particularly with the front entry configuration. Overall receiver thermal efficiencies of up to 88% were predicted for the SVR operating with high mass flow rates of both particles and air, but it is expected that the thermal efficiency of the device for all operating conditions assessed here would increase with an increase in receiver scale from the laboratory-scale device considered here.

ACS Style

Dominic Davis; Mehdi Jafarian; Alfonso Chinnici; Woei Lean Saw; Graham J. Nathan. Thermal performance of vortex-based solar particle receivers for sensible heating. Solar Energy 2018, 177, 163 -177.

AMA Style

Dominic Davis, Mehdi Jafarian, Alfonso Chinnici, Woei Lean Saw, Graham J. Nathan. Thermal performance of vortex-based solar particle receivers for sensible heating. Solar Energy. 2018; 177 ():163-177.

Chicago/Turabian Style

Dominic Davis; Mehdi Jafarian; Alfonso Chinnici; Woei Lean Saw; Graham J. Nathan. 2018. "Thermal performance of vortex-based solar particle receivers for sensible heating." Solar Energy 177, no. : 163-177.

Journal article
Published: 01 May 2018 in Solar Energy
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ACS Style

Ka Lok Lee; Alfonso Chinnici; Mehdi Jafarian; Maziar Arjomandi; Bassam Dally; Graham Nathan. Experimental investigation of the effects of wind speed and yaw angle on heat losses from a heated cavity. Solar Energy 2018, 165, 178 -188.

AMA Style

Ka Lok Lee, Alfonso Chinnici, Mehdi Jafarian, Maziar Arjomandi, Bassam Dally, Graham Nathan. Experimental investigation of the effects of wind speed and yaw angle on heat losses from a heated cavity. Solar Energy. 2018; 165 ():178-188.

Chicago/Turabian Style

Ka Lok Lee; Alfonso Chinnici; Mehdi Jafarian; Maziar Arjomandi; Bassam Dally; Graham Nathan. 2018. "Experimental investigation of the effects of wind speed and yaw angle on heat losses from a heated cavity." Solar Energy 165, no. : 178-188.

Journal article
Published: 01 April 2018 in Energy
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Thermochemical energy storage (TCES) systems are a promising alternative to conventional molten salt systems for integration with solar thermal power plants. TCES systems can offer high storage densities and high storage temperatures. Thus, they have the potential to increase the efficiency and reduce the levelized cost of electricity of solar thermal power plants. The present study investigates reacting systems with alkaline carbonates and hydroxides and metal oxides performing redox and chemical looping combustion reactions for their near-term deployment potential. 17 solid–gas TCES systems are identified from the initial set of 21 systems for techno-economic assessment. A quantitative assessment methodology based on techno-economic performance indicators (TPIs) is proposed for the comparative analysis. The techno-economic analysis indicates that energy consumption by auxiliary equipment and the cost of the feedstock are the most important factors affecting the system capital cost. Eight TCES systems are identified as competitive with molten salts in the near term, with an estimated capital cost lower than $25 MJ−1: hydroxide looping with Ca(OH)2/CaO, Sr(OH)2/SrO and Ba(OH)2/BaO; carbonate looping with CaCO3/CaO and SrCO3/SrO; redox with BaO2/BaO and chemical looping combustion with Fe3O4/FeO and NiO/Ni.

ACS Style

Alicia Bayon; Roman Bader; Mehdi Jafarian; Larissa Fedunik-Hofman; Yanping Sun; Jim Hinkley; Sarah Miller; Wojciech Lipiński. Techno-economic assessment of solid–gas thermochemical energy storage systems for solar thermal power applications. Energy 2018, 149, 473 -484.

AMA Style

Alicia Bayon, Roman Bader, Mehdi Jafarian, Larissa Fedunik-Hofman, Yanping Sun, Jim Hinkley, Sarah Miller, Wojciech Lipiński. Techno-economic assessment of solid–gas thermochemical energy storage systems for solar thermal power applications. Energy. 2018; 149 ():473-484.

Chicago/Turabian Style

Alicia Bayon; Roman Bader; Mehdi Jafarian; Larissa Fedunik-Hofman; Yanping Sun; Jim Hinkley; Sarah Miller; Wojciech Lipiński. 2018. "Techno-economic assessment of solid–gas thermochemical energy storage systems for solar thermal power applications." Energy 149, no. : 473-484.

Journal article
Published: 01 March 2018 in International Journal of Hydrogen Energy
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ACS Style

Mohsen Sarafraz; Mehdi Jafarian; Maziar Arjomandi; G.J. Nathan. Potential of molten lead oxide for liquid chemical looping gasification (LCLG): A thermochemical analysis. International Journal of Hydrogen Energy 2018, 43, 4195 -4210.

AMA Style

Mohsen Sarafraz, Mehdi Jafarian, Maziar Arjomandi, G.J. Nathan. Potential of molten lead oxide for liquid chemical looping gasification (LCLG): A thermochemical analysis. International Journal of Hydrogen Energy. 2018; 43 (9):4195-4210.

Chicago/Turabian Style

Mohsen Sarafraz; Mehdi Jafarian; Maziar Arjomandi; G.J. Nathan. 2018. "Potential of molten lead oxide for liquid chemical looping gasification (LCLG): A thermochemical analysis." International Journal of Hydrogen Energy 43, no. 9: 4195-4210.

Journal article
Published: 01 January 2018 in Progress in Energy and Combustion Science
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ACS Style

G.J. Nathan; Mehdi Jafarian; B.B. Dally; Woei Lean Saw; Peter Ashman; E. Hu; A. Steinfeld. Solar thermal hybrids for combustion power plant: A growing opportunity. Progress in Energy and Combustion Science 2018, 64, 4 -28.

AMA Style

G.J. Nathan, Mehdi Jafarian, B.B. Dally, Woei Lean Saw, Peter Ashman, E. Hu, A. Steinfeld. Solar thermal hybrids for combustion power plant: A growing opportunity. Progress in Energy and Combustion Science. 2018; 64 ():4-28.

Chicago/Turabian Style

G.J. Nathan; Mehdi Jafarian; B.B. Dally; Woei Lean Saw; Peter Ashman; E. Hu; A. Steinfeld. 2018. "Solar thermal hybrids for combustion power plant: A growing opportunity." Progress in Energy and Combustion Science 64, no. : 4-28.

Journal article
Published: 01 November 2017 in Solar Energy
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The relative potential of liquid multivalent metal oxides for the storage of thermal energy as sensible, latent and/or thermochemical storage energy in a liquid chemical looping thermal enerrgy storage (LCL-TES) is reported. This LCL-TES cycle comprises a reduction reactor, an oxidation reactor, two reservoirs for storing the hot and cold medium and a heat recovery unit. The materials were assessed on the basis of their melting temperature, Gibbs free energy, reaction temperature and thermal storage capacity. Ellingham diagrams were used to identify regimes with a potential for application in a LCL-TES, while phase diagrams were used to identify processes which combine sensible, latent and thermochemical heat storage. Based on these criteria, the oxide of CuO/Cu2O was found to have the greatest thermodynamic potential for use in a LCL-TES system with a total enthalpy of 404.67 kJ/mol for thermal storage. However, the high temperature of ∼1200 °C and corrosive nature of molten copper and its oxides will make this cycle challenging to implement. Lead, on the other hand has a lower total enthalpy of 250.09 kJ/mol, but is molten at lower temperatures.

ACS Style

Mahyar Silakhori; Mehdi Jafarian; Maziar Arjomandi; Graham Nathan. Comparing the thermodynamic potential of alternative liquid metal oxides for the storage of solar thermal energy. Solar Energy 2017, 157, 251 -258.

AMA Style

Mahyar Silakhori, Mehdi Jafarian, Maziar Arjomandi, Graham Nathan. Comparing the thermodynamic potential of alternative liquid metal oxides for the storage of solar thermal energy. Solar Energy. 2017; 157 ():251-258.

Chicago/Turabian Style

Mahyar Silakhori; Mehdi Jafarian; Maziar Arjomandi; Graham Nathan. 2017. "Comparing the thermodynamic potential of alternative liquid metal oxides for the storage of solar thermal energy." Solar Energy 157, no. : 251-258.

Journal article
Published: 01 September 2017 in Solar Energy
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A novel solar chemical looping air separation (Sol-CLAS) system is proposed here, in which oxygen carrier particles, composed of CuO as the active ingredient and MgAl2O4 as the inert support, are employed to provide both solar thermal energy storage for power generation and to separate oxygen from air. The process has been simulated using codes developed in MATLAB and Aspen Plus software for the average diurnal solar insolation of Port Augusta, South Australia. The simulation predicts that 1000 °C can be achieved in both the solar reduction and oxidation reactors, whose identical temperature results in low exergy destruction. A net cycle efficiency of 46% is predicted with the oxygen co-product of 0.023 m3/MJ of input solar energy. The calculations also show that 81% of the total input solar energy to the system is stored as combined chemical and sensible heat in the oxygen carrier particles. The required enthalpy of reaction is 26% of the net absorbed input solar energy which is stored as chemical heat in the particles and consequently used for oxygen production. The variations of temperature and composition in different flow streams, total flow rate of oxygen produced per day, the amount of particles stored in the tanks, together with the fraction of sensible and chemical storages are also reported. Also reported is the sensitivity to the effects of main operating parameters of reservoir temperature and conversion of particles are also reported.

ACS Style

Pegah Haseli; Mehdi Jafarian; Graham Nathan. High temperature solar thermochemical process for production of stored energy and oxygen based on CuO/Cu 2 O redox reactions. Solar Energy 2017, 153, 1 -10.

AMA Style

Pegah Haseli, Mehdi Jafarian, Graham Nathan. High temperature solar thermochemical process for production of stored energy and oxygen based on CuO/Cu 2 O redox reactions. Solar Energy. 2017; 153 ():1-10.

Chicago/Turabian Style

Pegah Haseli; Mehdi Jafarian; Graham Nathan. 2017. "High temperature solar thermochemical process for production of stored energy and oxygen based on CuO/Cu 2 O redox reactions." Solar Energy 153, no. : 1-10.

Journal article
Published: 01 September 2017 in Applied Energy
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Not availableMehdi Jafarian, Maziar Arjomandi, Graham J.Natha

ACS Style

Mehdi Jafarian; Maziar Arjomandi; Graham J. Nathan. Thermodynamic potential of molten copper oxide for high temperature solar energy storage and oxygen production. Applied Energy 2017, 201, 69 -83.

AMA Style

Mehdi Jafarian, Maziar Arjomandi, Graham J. Nathan. Thermodynamic potential of molten copper oxide for high temperature solar energy storage and oxygen production. Applied Energy. 2017; 201 ():69-83.

Chicago/Turabian Style

Mehdi Jafarian; Maziar Arjomandi; Graham J. Nathan. 2017. "Thermodynamic potential of molten copper oxide for high temperature solar energy storage and oxygen production." Applied Energy 201, no. : 69-83.

Original
Published: 07 June 2017 in Heat and Mass Transfer
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A semi-empirical model for the estimation of the rate of bubble growth in nucleate pool boiling is presented, considering a new equation to estimate the temperature history of the bubble in the bulk of liquid. The conservation equations of energy, mass and momentum have been firstly derived and solved analytically. The present analytical model of the bubble growth predicts that the radius of the bubble grows as a function of \( \sqrt{t}.\mathit{\operatorname{erf}}\left( N\sqrt{t}\right) \), while so far the bubble growth rate has been mainly correlated to \( \sqrt{t} \) in the previous studies. In the next step, the analytical solutions were used to develop a new semi-empirical equation. To achieve this, firstly the analytical solution were non-dimensionalised and then the experimental data, available in the literature, were applied to tune the dimensionless coefficients appeared in the dimensionless equation. Finally, the reliability of the proposed semi-empirical model was assessed through comparison of the model predictions with the available experimental data in the literature, which were not applied in the tuning of the dimensionless parameters of the model. The comparison of the model predictions with other proposed models in the literature was also performed. These comparisons show that this model enables more accurate predictions than previously proposed models with a deviation of less than 10% in a wide range of operating conditions.

ACS Style

Mohammad Reza Abdollahi; Mehdi Jafarian; Mohammad Jamialahmadi. The rate of bubble growth in a superheated liquid in pool boiling. Heat and Mass Transfer 2017, 53, 3433 -3442.

AMA Style

Mohammad Reza Abdollahi, Mehdi Jafarian, Mohammad Jamialahmadi. The rate of bubble growth in a superheated liquid in pool boiling. Heat and Mass Transfer. 2017; 53 (12):3433-3442.

Chicago/Turabian Style

Mohammad Reza Abdollahi; Mehdi Jafarian; Mohammad Jamialahmadi. 2017. "The rate of bubble growth in a superheated liquid in pool boiling." Heat and Mass Transfer 53, no. 12: 3433-3442.