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Dr. Lorenzo Talluri
Università degli Studi di Firenze

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0 Fluid Dynamics
0 ORC
0 Renewable Energy
0 Turbines
0 exergy

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tesla turbine
ORC
Fluid Dynamics
Turbines
exergoeconomic
exergy
Renewable Energy
geothermal energy
exergoenvironmental

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Journal article
Published: 24 July 2021 in Energy
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Despite the huge potential, energy harnessing from sea waves is often still at a demonstrative stage. Oscillating water column (OWC) wave energy converters have proven to be one of the few suitable solutions to this end. A wave-to-wire analytical code modelling an entire wave energy converter based on the OWC technology, operating with either a Wells or an impulse turbine, was developed. The hydrodynamics, thermodynamics, and aerodynamics of the caisson were determined with a rigid piston approach. Two original low-order aerodynamic models were created for the two turbines, providing an interesting compromise between accuracy and computational cost. Finally, a control strategy was applied to monitor the instant rotor angular velocity and torque in both design and off-design conditions. The simulation tool was applied to screen the geometry of two typologies of air turbines for a specific chamber under the wave conditions of a selected Mediterranean site located in Sardinia (Italy). In particular, annual and seasonal scatter matrices were utilised to define the wave conditions of the site, providing an overview of the seasonal performance variation. The designed Wells and impulse turbines are capable of converting 47.67 and 41.14 MWh/year and operate with an overall efficiency of 5.77% and 4.98%, respectively.

ACS Style

Lorenzo Ciappi; Lapo Cheli; Irene Simonetti; Alessandro Bianchini; Lorenzo Talluri; Lorenzo Cappietti; Giampaolo Manfrida. Wave-to-wire models of Wells and impulse turbines for oscillating water column wave energy converters operating in the Mediterranean Sea. Energy 2021, 121585 .

AMA Style

Lorenzo Ciappi, Lapo Cheli, Irene Simonetti, Alessandro Bianchini, Lorenzo Talluri, Lorenzo Cappietti, Giampaolo Manfrida. Wave-to-wire models of Wells and impulse turbines for oscillating water column wave energy converters operating in the Mediterranean Sea. Energy. 2021; ():121585.

Chicago/Turabian Style

Lorenzo Ciappi; Lapo Cheli; Irene Simonetti; Alessandro Bianchini; Lorenzo Talluri; Lorenzo Cappietti; Giampaolo Manfrida. 2021. "Wave-to-wire models of Wells and impulse turbines for oscillating water column wave energy converters operating in the Mediterranean Sea." Energy , no. : 121585.

Journal article
Published: 06 May 2021 in Energies
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A comprehensive cost correlation analysis was conducted based on available cost correlations, and new equipment cost correlation models were proposed based on QUE$TOR modeling. Cost correlations for various types of equipment such as pumps, compressors, heat exchangers, air coolers, and pressure vessels were generated on the basis of extracted cost data. The models were derived on the basis of robust multivariable regression with the aim of minimizing the residuals by using the genetic algorithm. The proposed compressor models for both centrifugal and reciprocating types showed that the Turton cost estimation for carbon steel compressor and Matche’s and Mhhe’s data were compatible with the generated model. According to the results, the cost trend in the Turton correlation for carbon steel had a somewhat lower estimation than these correlations. Further, the cost trend of the Turton correlation for carbon steel pressure vessels was close to the presented model trend for both bullet and sphere types. The Turton cost trend for U-tube shell-and-tube heat exchangers with carbon steel shell and stainless steel tube was close to the proposed heat exchanger model. Furthermore, the Turton cost trend for the flat-plate heat exchanger using carbon steel was similar to the proposed model with a slight difference.

ACS Style

Moein Shamoushaki; Pouriya Niknam; Lorenzo Talluri; Giampaolo Manfrida; Daniele Fiaschi. Development of Cost Correlations for the Economic Assessment of Power Plant Equipment. Energies 2021, 14, 2665 .

AMA Style

Moein Shamoushaki, Pouriya Niknam, Lorenzo Talluri, Giampaolo Manfrida, Daniele Fiaschi. Development of Cost Correlations for the Economic Assessment of Power Plant Equipment. Energies. 2021; 14 (9):2665.

Chicago/Turabian Style

Moein Shamoushaki; Pouriya Niknam; Lorenzo Talluri; Giampaolo Manfrida; Daniele Fiaschi. 2021. "Development of Cost Correlations for the Economic Assessment of Power Plant Equipment." Energies 14, no. 9: 2665.

Journal article
Published: 11 February 2021 in Sustainability
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This study deals with the life cycle assessment (LCA) and an exergo-environmental analysis (EEvA) of the geothermal Power Plant of Hellisheiði (Iceland), a combined heat and power double flash plant, with an installed power of 303.3 MW for electricity and 133 MW for hot water. LCA approach is used to evaluate and analyse the environmental performance at the power plant global level. A more in-depth study is developed, at the power plant components level, through EEvA. The analysis employs existing published data with a realignment of the inventory to the latest data resource and compares the life cycle impacts of three methods (ILCD 2011 Midpoint, ReCiPe 2016 Midpoint-Endpoint, and CML-IA Baseline) for two different scenarios. In scenario 1, any emission abatement system is considered. In scenario 2, re-injection of CO2 and H2S is accounted for. The analysis identifies some major hot spots for the environmental power plant impacts, like acidification, particulate matter formation, ecosystem, and human toxicity, mainly caused by some specific sources. Finally, an exergo-environmental analysis allows indicating the wells as significant contributors of the environmental impact rate associated with the construction, Operation & Maintenance, and end of life stages and the HP condenser as the component with the highest environmental cost rate.

ACS Style

Vitantonio Colucci; Giampaolo Manfrida; Barbara Mendecka; Lorenzo Talluri; Claudio Zuffi. LCA and Exergo-Environmental Evaluation of a Combined Heat and Power Double-Flash Geothermal Power Plant. Sustainability 2021, 13, 1935 .

AMA Style

Vitantonio Colucci, Giampaolo Manfrida, Barbara Mendecka, Lorenzo Talluri, Claudio Zuffi. LCA and Exergo-Environmental Evaluation of a Combined Heat and Power Double-Flash Geothermal Power Plant. Sustainability. 2021; 13 (4):1935.

Chicago/Turabian Style

Vitantonio Colucci; Giampaolo Manfrida; Barbara Mendecka; Lorenzo Talluri; Claudio Zuffi. 2021. "LCA and Exergo-Environmental Evaluation of a Combined Heat and Power Double-Flash Geothermal Power Plant." Sustainability 13, no. 4: 1935.

Journal article
Published: 15 August 2020 in Energy
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The Tesla turbine - also known as friction, viscous or bladeless turbine - is a peculiar expander, whichgenerates power through viscous entrainment. In the last years, it has gained a renewed appeal due to the rising of distributed power generation applications. Indeed, this expander is not suitable to large size power generation, but it could become a breakthrough technology in the low power ranges, due to its characteristics of low cost and reliability.The current study presents a design approach to the Tesla turbine, applied to organic working fluids (R1233zd(E), R245fa, R1234yf, n-Hexane). Three fundamental geometric parameters are identified (rotor channel width/inlet diameter ratio, rotor outlet/inlet diameter ratio, throat width ratio) and their effects on the performance are analyzed. The geometry of the turbine has been defined and the assessment of the performance potential is run, applying a 2D code for the viscous flow solution, considering real compressible fluid properties.For all the investigated working fluids, an efficiency higher than 60% has been achieved, with the defined geometry, under suitable thermo fluid-dynamic conditions.

ACS Style

Lorenzo Talluri; Olivier Dumont; Giampaolo Manfrida; Vincent Lemort; Daniele Fiaschi. Geometry definition and performance assessment of Tesla turbines for ORC. Energy 2020, 211, 118570 .

AMA Style

Lorenzo Talluri, Olivier Dumont, Giampaolo Manfrida, Vincent Lemort, Daniele Fiaschi. Geometry definition and performance assessment of Tesla turbines for ORC. Energy. 2020; 211 ():118570.

Chicago/Turabian Style

Lorenzo Talluri; Olivier Dumont; Giampaolo Manfrida; Vincent Lemort; Daniele Fiaschi. 2020. "Geometry definition and performance assessment of Tesla turbines for ORC." Energy 211, no. : 118570.

Journal article
Published: 06 July 2020 in Energies
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Renewable energies are often subject to stochastic resources and daily cycles. Energy storage systems are consequently applied to provide a solution for the mismatch between power production possibility and its utilization period. In this study, a solar integrated thermo-electric energy storage (S-TEES) is analyzed both from an economic and environmental point of view. The analyzed power plant with energy storage includes three main cycles, a supercritical CO2 power cycle, a heat pump and a refrigeration cycle, indirectly connected by sensible heat storages. The hot reservoir is pressurized water at 120/160 °C, while the cold reservoir is a mixture of water and ethylene glycol, maintained at −10/−20 °C. Additionally, the power cycle’s evaporator section rests on a solar-heated intermediate temperature (95/40 °C) heat reservoir. Exergo-economic and exergo-environmental analyses are performed to identify the most critical components of the system and to obtain the levelized cost of electricity (LCOE), as well as the environmental indicators of the system. Both economic and environmental analyses revealed that solar energy converting devices are burdened with the highest impact indicators. According to the results of exergo-economic analysis, it turned out that average annual LCOE of S-TEES can be more than two times higher than the regular electricity prices. However, the true features of the S-TEES system should be only fully assessed if the economic results are balanced with environmental analysis. Life cycle assessment (LCA) revealed that the proposed S-TEES system has about two times lower environmental impact than referential hydrogen storage systems compared in the study.

ACS Style

Daniele Fiaschi; Giampaolo Manfrida; Karolina Petela; Federico Rossi; Adalgisa Sinicropi; Lorenzo Talluri. Exergo-Economic and Environmental Analysis of a Solar Integrated Thermo-Electric Storage. Energies 2020, 13, 3484 .

AMA Style

Daniele Fiaschi, Giampaolo Manfrida, Karolina Petela, Federico Rossi, Adalgisa Sinicropi, Lorenzo Talluri. Exergo-Economic and Environmental Analysis of a Solar Integrated Thermo-Electric Storage. Energies. 2020; 13 (13):3484.

Chicago/Turabian Style

Daniele Fiaschi; Giampaolo Manfrida; Karolina Petela; Federico Rossi; Adalgisa Sinicropi; Lorenzo Talluri. 2020. "Exergo-Economic and Environmental Analysis of a Solar Integrated Thermo-Electric Storage." Energies 13, no. 13: 3484.

Journal article
Published: 05 June 2020 in Energies
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Geothermal energy is acknowledged globally as a renewable resource, which, unlike solar, wind or wave energy, can be continuously exploited. The geothermal fluids usually have some acid gas content, which needs to be precisely taken into account when predicting the actual potential of a power plant in dealing with an effective reinjection. One of the key parameters to assess is the solubility of the acid gas, as it influences the thermodynamic conditions (saturation pressure and temperature) of the fluid. Therefore, an enhanced solubility model for the CO2-H2S-water system is developed in this study, based on the mutual solubility of gases. The model covers a wide range of pressures and temperatures. The genetic algorithm is employed to calculate the correlation constants and corresponding solubility values of both CO2 and H2S as functions of pressure, temperature and the balance of the gas. The results are validated against previously published models and experimental data available in the literature. The proposed model estimates the pure gas solubility, which is also a feature of other models. The more innovative feature of the model is the solubility estimation of each CO2 or H2S in simultaneous presence, such as when the binary gas is injected into the pure water of the geothermal reinjection well. The proposed solubility model fits well with the available experimental data, with a mean deviation lower than 0.2%.

ACS Style

Pouriya H. Niknam; Lorenzo Talluri; Daniele Fiaschi; Giampaolo Manfrida. Improved Solubility Model for Pure Gas and Binary Mixture of CO2-H2S in Water: A Geothermal Case Study with Total Reinjection. Energies 2020, 13, 2883 .

AMA Style

Pouriya H. Niknam, Lorenzo Talluri, Daniele Fiaschi, Giampaolo Manfrida. Improved Solubility Model for Pure Gas and Binary Mixture of CO2-H2S in Water: A Geothermal Case Study with Total Reinjection. Energies. 2020; 13 (11):2883.

Chicago/Turabian Style

Pouriya H. Niknam; Lorenzo Talluri; Daniele Fiaschi; Giampaolo Manfrida. 2020. "Improved Solubility Model for Pure Gas and Binary Mixture of CO2-H2S in Water: A Geothermal Case Study with Total Reinjection." Energies 13, no. 11: 2883.

Journal article
Published: 21 January 2020 in Renewable Energy
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Vertical-Axis Wind Turbines are an appreciated design for small-scale units (Re < 5*105, P < 15 kW), with demonstrated reliability and performance levels comparable, at such scales, to horizontal-axis design and also present significant benefits (no sensitivity to wind direction, simple construction). However, the fluid dynamics performance is limited by operating the airfoils at limited Reynolds numbers (10^4 < Re < 5*105), consequently with a poor response to high incidence conditions. A potential improvement is to use morphing blades, or – as a starting point – to reduce dynamically the angle of attack through pitch adjustment. A multiple-stream tube double-actuator disk model, including dynamic stall treatment, was modified to evaluate the effect of different possible control laws for dynamic pitch adjustment. The results show that the margin for performance improvement is relevant, and that a moderate amplitude of pitch excursion can be sufficient, which is technically feasible using fast-response actuators.

ACS Style

Giampaolo Manfrida; Lorenzo Talluri. Smart pro-active pitch adjustment for VAWT blades: Potential for performance improvement. Renewable Energy 2020, 152, 867 -875.

AMA Style

Giampaolo Manfrida, Lorenzo Talluri. Smart pro-active pitch adjustment for VAWT blades: Potential for performance improvement. Renewable Energy. 2020; 152 ():867-875.

Chicago/Turabian Style

Giampaolo Manfrida; Lorenzo Talluri. 2020. "Smart pro-active pitch adjustment for VAWT blades: Potential for performance improvement." Renewable Energy 152, no. : 867-875.

Monograph
Published: 01 January 2020 in Development of optical methods for real-time whole-brain functional imaging of zebrafish neuronal activity
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The Tesla expander was first developed by N. Tesla at the beginning of the 20th century. In recent years, due to the increasing appeal towards micro power generation and energy recovery from wasted flows, this cost effective expander technology rose a renovated interest. In the present study, a 2D numerical model is realized and a design procedure of a Tesla turbine for ORC applications is proposed. A throughout optimization method is developed by evaluating the losses of each component. The 2D model results are further exploited through the development of 3D computational investigation, which allows an accurate comprehension of the flow characteristics. Finally, two prototypes are designed, realized and tested. The former one is designed to work with air as working fluid. The second prototype is designed to work with organic fluids. The achieved experimental results confirmed the validity and the large potential applicative chances of this emerging technology in the field of micro sizes, low inlet temperature and low expansion ratios.

ACS Style

Lorenzo Talluri. Micro turbo expander design for small scale ORC. Development of optical methods for real-time whole-brain functional imaging of zebrafish neuronal activity 2020, 87, 1 .

AMA Style

Lorenzo Talluri. Micro turbo expander design for small scale ORC. Development of optical methods for real-time whole-brain functional imaging of zebrafish neuronal activity. 2020; 87 ():1.

Chicago/Turabian Style

Lorenzo Talluri. 2020. "Micro turbo expander design for small scale ORC." Development of optical methods for real-time whole-brain functional imaging of zebrafish neuronal activity 87, no. : 1.

Conference paper
Published: 01 January 2020 in Proceedings
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In recent years the climate change issue, coupled with the concern of resource depletion, is favoring the blossoming of renewable energy conversion systems. Particularly, the development of new technologies for the combustion of biomass has drawn special attention to the possibility of coupling thermoelectric modules with stove-fireplaces. The current thermoelectric generators have many attractive points, such as a solid structure, absence of noise, and no maintenance required; however, due to their very low efficiency (4–8%), they are still economically non-attractive. However, if the modules are applied to a heat source, which otherwise would be wasted, the interest in the solution certainly grows. In this study, an exergy analysis of a stove-fireplace coupled with thermo-electric modules is performed, with the aim of identifying the critical issues of the overall system. The obtained exergy efficiency of the whole system resulted to be of 36.2%. A sensitivity analysis on the main parameters affecting the second law efficiency of the system (such as number of cells, dimension of the stove fireplace, heat input …) is also carried out.

ACS Style

Giampaolo Manfrida; Lorenzo Talluri. Exergy Analysis of a Wood Fireplace Coupled with Thermo-Electric Modules. Proceedings 2020, 58, 1 .

AMA Style

Giampaolo Manfrida, Lorenzo Talluri. Exergy Analysis of a Wood Fireplace Coupled with Thermo-Electric Modules. Proceedings. 2020; 58 (1):1.

Chicago/Turabian Style

Giampaolo Manfrida; Lorenzo Talluri. 2020. "Exergy Analysis of a Wood Fireplace Coupled with Thermo-Electric Modules." Proceedings 58, no. 1: 1.

Journal article
Published: 19 August 2019 in Energy Conversion and Management
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The proposed Thermo-Electric Energy Storage (TEES) system addresses the need for peak-load support (1–2 daily hours of operation) for small-distributed users who are often owners of small/medium size PV systems (4 to 50 kWe) and wish to introduce a reliable storage system able to compensate the productivity/load mismatch. The proposed thermoelectric system relies on sensible heat storage: a warm resource at 120/160 °C (a hot water reservoir system), and a cold resource at −10 /−20 °C (a cold reservoir system containing water and ethylene glycol). The power cycle operates through a trans-critical CO2 scheme including recuperation; in the storage mode, a supercritical heat pump restores heat to the hot reservoir, while a cooling cycle (using a suitable refrigerant) cools the cold reservoir. The power cycle and the heat pump benefit from geothermal heat integration at low-medium temperatures (80–120 °C), thereby allowing to achieve a marginal round-trip efficiency (electric-to-electric) in the range from 50 to 75% (not considering geothermal heat integration). The three systems are analyzed with different resource conditions and parameters setting (hot storage temperature, pressure levels for all cycles, ambient temperature…); exergy and exergo-economic analyses are performed to evaluate the economic competitiveness and in order to identify the critical items in the system. A sensitivity analysis on the main parameters affecting the produced power cost of the system per unit electric energy is carried out.

ACS Style

Lorenzo Talluri; Giampaolo Manfrida; Daniele Fiaschi. Thermoelectric energy storage with geothermal heat integration – Exergy and exergo-economic analysis. Energy Conversion and Management 2019, 199, 111883 .

AMA Style

Lorenzo Talluri, Giampaolo Manfrida, Daniele Fiaschi. Thermoelectric energy storage with geothermal heat integration – Exergy and exergo-economic analysis. Energy Conversion and Management. 2019; 199 ():111883.

Chicago/Turabian Style

Lorenzo Talluri; Giampaolo Manfrida; Daniele Fiaschi. 2019. "Thermoelectric energy storage with geothermal heat integration – Exergy and exergo-economic analysis." Energy Conversion and Management 199, no. : 111883.

Journal article
Published: 17 February 2019 in Energies
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A Thermo-Electric Energy Storage (TEES) system is proposed to provide peak-load support (1–2 daily hours of operation) for distributed users using small/medium-size photovoltaic systems (4 to 50 kWe). The purpose is to complement the PV with a reliable storage system that cancompensate the produc tivity/load mismatch, aiming at off-grid operation. The proposed TEES applies sensible heat storage, using insulated warm-water reservoirs at 120/160 °C, and cold storage at −10/−20 °C (water and ethylene glycol). The power cycle is a trans-critical CO2 unit including recuperation; in the storage mode, a supercritical heat pump restores heat to the hot reservoir, while a cooling cycle cools the cold reservoir; both the heat pump and cooling cycle operate on photovoltaic (PV) energy, and benefit from solar heat integration at low–medium temperatures (80–120 °C). This allows the achievement of a marginal round-trip efficiency (electric-to-electric) in the range of 50% (not considering solar heat integration).The TEES system is analysed with different resource conditions and parameters settings (hot storage temperature, pressure levels for all cycles, ambient temperature, etc.), making reference to standard days of each month of the year; exergy and exergo-economic analyses are performed to identify the critical items in the complete system and the cost of stored electricity.

ACS Style

Daniele Fiaschi; Giampaolo Manfrida; Karolina Petela; Lorenzo Talluri. Thermo-Electric Energy Storage with Solar Heat Integration: Exergy and Exergo-Economic Analysis. Energies 2019, 12, 648 .

AMA Style

Daniele Fiaschi, Giampaolo Manfrida, Karolina Petela, Lorenzo Talluri. Thermo-Electric Energy Storage with Solar Heat Integration: Exergy and Exergo-Economic Analysis. Energies. 2019; 12 (4):648.

Chicago/Turabian Style

Daniele Fiaschi; Giampaolo Manfrida; Karolina Petela; Lorenzo Talluri. 2019. "Thermo-Electric Energy Storage with Solar Heat Integration: Exergy and Exergo-Economic Analysis." Energies 12, no. 4: 648.

Journal article
Published: 07 February 2019 in Energy
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Tesla expander is a bladeless turbine suited to low power range applications. In this article, a comparison between the performance prediction, as well as the assessment of the main flow characteristics, of a Tesla turbine working with organic fluids obtained through an in-house 2D code developed in EES environment and a simulation run with a computational fluid dynamics commercial software was done. Three working fluids (R404a, R134a and R245fa) were analysed in order to determine the related performance parameters. Various computations were carried out at several speeds of revolution, both with the laminar model and the Langtry-Menter transitional shear stress transport model for turbulence processing. High rotor efficiency was predicted for a small-scale prototype working with all analysed fluids (69% at 3000 rpm). The results obtained by the CFD simulations and by the in-house code showed an excellent matching. Finally, absolute and relative flow path lines were computed in order to determine fluid dynamics inside the channel and to analyse the fundamental flow phenomena.

ACS Style

L. Ciappi; D. Fiaschi; P.H. Niknam; L. Talluri. Computational investigation of the flow inside a Tesla turbine rotor. Energy 2019, 173, 207 -217.

AMA Style

L. Ciappi, D. Fiaschi, P.H. Niknam, L. Talluri. Computational investigation of the flow inside a Tesla turbine rotor. Energy. 2019; 173 ():207-217.

Chicago/Turabian Style

L. Ciappi; D. Fiaschi; P.H. Niknam; L. Talluri. 2019. "Computational investigation of the flow inside a Tesla turbine rotor." Energy 173, no. : 207-217.

Journal article
Published: 02 February 2019 in Energies
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Modern textile stenters are designed to reduce the inefficiency of the process and to recover the flow stream, which still contains a relatively high energetic value. In recent years, research has focused on the recovery of the energy content of the low-temperature exhaust flow; nonetheless, another important aspect that may increase the efficiency of the process is the reduction of the ambient air suction. In the present research, an innovative way to improve both machine insulation and energy savings, by using preheated air, was numerically evaluated. The proposed solution utilizes an air stream transverse to the fabric (generally called air curtain), either preheated or not, to create soft gates both at the inlet and at the outlet section of the drying machine. Several valuable advantages can be listed when using this solution: reduction of the dispersion of heat and humid polluted air to the work environment, limitation of air ingestion from outside, and effective heat recovery coupled to a uniform temperature profile around the textile fabric. To analyze the insulation capability of the air curtains in terms of mass and energy transfer, a two-dimensional CFD model of the machine was realized. A test matrix including three possible fabric speeds (20, 40 and 60 m/min), three tilt angles (−15°, 0° and 15°), four mass flow rates (0% with no air curtains and 3%, 5% and 7% of the total flow rate through the machine, where the 5% case is equivalent to the flow rate ingested from the ambient) and two temperatures (15 °C and 70 °C) of the plane jets exiting from the air curtains was considered, thus covering a wide range of possible practical applications. The obtained results demonstrate that warm air curtains at both the inlet and outlet are very effective in a fabric speed range up to 40 m/min; at higher fabric speed, entrainment of warm gases from inside the machine at the fabric outlet becomes relevant, and the adoption of a cold air curtain (capable of better insulation) can be recommended in this position.

ACS Style

Lorenzo Ciappi; Daniele Fiaschi; Giampaolo Manfrida; Simone Salvadori; Jacek Smolka; Lorenzo Talluri. Heat Recovery for a Textile Stenter: CFD Analysis of Air Curtain Benefits. Energies 2019, 12, 482 .

AMA Style

Lorenzo Ciappi, Daniele Fiaschi, Giampaolo Manfrida, Simone Salvadori, Jacek Smolka, Lorenzo Talluri. Heat Recovery for a Textile Stenter: CFD Analysis of Air Curtain Benefits. Energies. 2019; 12 (3):482.

Chicago/Turabian Style

Lorenzo Ciappi; Daniele Fiaschi; Giampaolo Manfrida; Simone Salvadori; Jacek Smolka; Lorenzo Talluri. 2019. "Heat Recovery for a Textile Stenter: CFD Analysis of Air Curtain Benefits." Energies 12, no. 3: 482.

Journal article
Published: 01 January 2019 in Thermal Science
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The Tesla turbine seems to offer several points of attractiveness when applied to low-power applications. Indeed, it is a simple, reliable, and low cost machine. The principle of operation of the turbine relies on the exchange of momentum due to the shear forces originated by the flow of the fluid through a tight gap among closely stacked disks. This turbine was firstly developed by Tesla at the beginning of the 20th century, but it did not stir up much attention due to the strong drive towards large centralized power plants, on the other hand, in recent years, as micro power generation gained attention on the energy market place, this original expander raised renewed interest. The mathematical model of the Tesla turbine rotor is revised, and adapted to real gas operation. The model is first validated by comparison with other assessed literature models. The optimal configuration of the rotor geometry is then investigated running a parametric analysis of the fundamental design parameters. High values of efficiency (isolated rotor) were obtained for the optimal configuration of the turbine, which appears interesting for small-scale power generation. The rotor efficiency depends on the configuration of the disks, particularly on the gap and on the outlet diameter, which determines largely the kinetic energy at discharge.

ACS Style

Giampaolo Manfrida; Lorenzo Talluri. Fluid dynamics assessment of the Tesla turbine rotor. Thermal Science 2019, 23, 1 -10.

AMA Style

Giampaolo Manfrida, Lorenzo Talluri. Fluid dynamics assessment of the Tesla turbine rotor. Thermal Science. 2019; 23 (1):1-10.

Chicago/Turabian Style

Giampaolo Manfrida; Lorenzo Talluri. 2019. "Fluid dynamics assessment of the Tesla turbine rotor." Thermal Science 23, no. 1: 1-10.

Journal article
Published: 01 September 2018 in Energy
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The Tesla turbine is an original expander working on the principle of torque transmission by wall shear stress. The principle – demonstrated for air expanders at lab scale - has attractive features when applied to ORC expanders: it is suitable for handling limited flow rates (as is the case for machines in the range from 500 W to 5 kW), it can be developed to a reasonable size (rotor diameters between 0.1 to 0.3 m), with limited rotational speeds (from 1000 to 12000 rpm). The original concept is revisited, improving the stator layout (which is the main responsible for poor performance) and developing a modular design allowing to cover a wide power range, as well as to realize a perfectly sealed operation and including other fluid dynamics improvements. The flow model assumes complete real fluid behaviour, and includes several new concepts such as bladed channels for the stator and a detailed treatment of losses. Preliminary design sketches are presented and results discussed and evaluated. Several working fluids are considered, from refrigerants (R245fa, R134a, SES36) to hydrocarbons (n-Hexane, n-Pentane).

ACS Style

G. Manfrida; L. Pacini; Lorenzo Talluri. An upgraded Tesla turbine concept for ORC applications. Energy 2018, 158, 33 -40.

AMA Style

G. Manfrida, L. Pacini, Lorenzo Talluri. An upgraded Tesla turbine concept for ORC applications. Energy. 2018; 158 ():33-40.

Chicago/Turabian Style

G. Manfrida; L. Pacini; Lorenzo Talluri. 2018. "An upgraded Tesla turbine concept for ORC applications." Energy 158, no. : 33-40.

Journal article
Published: 05 June 2018 in Applied Energy
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In recent years, small-micro power generation was appointed as one of the proper solutions to tackle the increasing energy consumption, while opening the way to distributed energy systems and micro grids. The most interesting solution for small-micro power generation is the ORC technology, however, it still needs further developments especially regarding the design of small and micro expanders. A possible solution for micro-expanders is the Tesla turbine, which is a viscous bladeless turbine. This concept was developed by Nikola Tesla at the beginning of the 20th century, but it went through a long period of indifference due to the run towards large size centralized power plants. Only recently it found a renewed appeal, as its features make it suitable for utilization in small and micro size systems, like ORC applications, where low cost components become very attractive for the exploitation of residual pressure drop. The present study develops a design procedure of a Tesla turbine for ORC applications. A throughout optimization method was performed by evaluating the losses of each component and by introducing an innovative rotor model. Three turbine configurations with different expander size were assessed, in order to show the performance potential of the Tesla turbine, which achieved 64% total-to-static efficiency when working with N-hexane fluid.

ACS Style

Lorenzo Talluri; D. Fiaschi; G. Neri; Lorenzo Ciappi. Design and optimization of a Tesla turbine for ORC applications. Applied Energy 2018, 226, 300 -319.

AMA Style

Lorenzo Talluri, D. Fiaschi, G. Neri, Lorenzo Ciappi. Design and optimization of a Tesla turbine for ORC applications. Applied Energy. 2018; 226 ():300-319.

Chicago/Turabian Style

Lorenzo Talluri; D. Fiaschi; G. Neri; Lorenzo Ciappi. 2018. "Design and optimization of a Tesla turbine for ORC applications." Applied Energy 226, no. : 300-319.

Journal article
Published: 01 April 2018 in Ocean Engineering
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Wind energy is a mature renewable energy source that offers significant potential for near-term (2020) and long-term (2050) greenhouse gas (GHG) emissions reductions. Similar to all sectors of the transportation industry, the marine industry is also focused towards reduction of environmental emissions. A direct consequence of this being is a renewed interest in utilising wind as supplementary energy source for propulsion on cargo/merchant ships. This research utilises a techno economic and environmental analysis approach to assess the possibility and benefits of harnessing wind energy, with an aim to establish the potential role of wind energy in reducing GHG emissions during conventional operation of marine vessels. The employed approach enables consistent assessment of different competing traditional propulsion systems when operated in conjunction with a novel environmental friendly technology, in this instance being the Flettner rotor technology. The assessment specifically focuses on quantifying the potential and relative reduction in fuel consumption and pollutant emissions that may be accrued while operating on typical Sea Lines of Communication. The results obtained indicate that the implementation of Flettner towers on commercial vessels could result in potential savings of up to 20% in terms of fuel consumption, and similar reductions in environmental emissions.

ACS Style

L. Talluri; D.K. Nalianda; E. Giuliani. Techno economic and environmental assessment of Flettner rotors for marine propulsion. Ocean Engineering 2018, 154, 1 -15.

AMA Style

L. Talluri, D.K. Nalianda, E. Giuliani. Techno economic and environmental assessment of Flettner rotors for marine propulsion. Ocean Engineering. 2018; 154 ():1-15.

Chicago/Turabian Style

L. Talluri; D.K. Nalianda; E. Giuliani. 2018. "Techno economic and environmental assessment of Flettner rotors for marine propulsion." Ocean Engineering 154, no. : 1-15.

Journal article
Published: 01 December 2017 in Energy Conversion and Management
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ACS Style

D. Fiaschi; G. Manfrida; E. Rogai; Lorenzo Talluri. Exergoeconomic analysis and comparison between ORC and Kalina cycles to exploit low and medium-high temperature heat from two different geothermal sites. Energy Conversion and Management 2017, 154, 503 -516.

AMA Style

D. Fiaschi, G. Manfrida, E. Rogai, Lorenzo Talluri. Exergoeconomic analysis and comparison between ORC and Kalina cycles to exploit low and medium-high temperature heat from two different geothermal sites. Energy Conversion and Management. 2017; 154 ():503-516.

Chicago/Turabian Style

D. Fiaschi; G. Manfrida; E. Rogai; Lorenzo Talluri. 2017. "Exergoeconomic analysis and comparison between ORC and Kalina cycles to exploit low and medium-high temperature heat from two different geothermal sites." Energy Conversion and Management 154, no. : 503-516.

Journal article
Published: 01 October 2017 in Energy Conversion and Management
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ACS Style

Daniele Fiaschi; Giampaolo Manfrida; Luigi Russo; Lorenzo Talluri. Improvement of waste heat recuperation on an industrial textile dryer: Redesign of heat exchangers network and components. Energy Conversion and Management 2017, 150, 924 -940.

AMA Style

Daniele Fiaschi, Giampaolo Manfrida, Luigi Russo, Lorenzo Talluri. Improvement of waste heat recuperation on an industrial textile dryer: Redesign of heat exchangers network and components. Energy Conversion and Management. 2017; 150 ():924-940.

Chicago/Turabian Style

Daniele Fiaschi; Giampaolo Manfrida; Luigi Russo; Lorenzo Talluri. 2017. "Improvement of waste heat recuperation on an industrial textile dryer: Redesign of heat exchangers network and components." Energy Conversion and Management 150, no. : 924-940.

Journal article
Published: 01 September 2017 in Energy Procedia
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ACS Style

Lorenzo Talluri; Giacomo Lombardi. Simulation and Design Tool for ORC Axial Turbine Stage. Energy Procedia 2017, 129, 277 -284.

AMA Style

Lorenzo Talluri, Giacomo Lombardi. Simulation and Design Tool for ORC Axial Turbine Stage. Energy Procedia. 2017; 129 ():277-284.

Chicago/Turabian Style

Lorenzo Talluri; Giacomo Lombardi. 2017. "Simulation and Design Tool for ORC Axial Turbine Stage." Energy Procedia 129, no. : 277-284.