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Mr. Giampaolo Manfrida
Dipartimento di Ingegneria Industriale, Università degli Studi di Firenze, Firenze Italy

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0 Sustainability
0 renewable energy sources
0 exergy analysis
0 exergo-economic analysis

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exergy analysis
exergo-economic analysis
exergo-environmental analysis
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renewable energy sources

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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: 19 April 2021 in Sustainability
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In this paper, we assess using two alternative allocation schemes, namely exergy and primary energy saving (PES) to compare products generated in different combined heat and power (CHP) geothermal systems. In particular, the adequacy and feasibility of the schemes recommended for allocation are demonstrated by their application to three relevant and significantly different case studies of geothermal CHPs, i.e., (1) Chiusdino in Italy, (2) Altheim in Austria, and (3) Hellisheidi in Iceland. The results showed that, given the generally low temperature level of the cogenerated heat (80–100 °C, usually exploited in district heating), the use of exergy allocation largely marginalizes the importance of the heat byproduct, thus, becoming almost equivalent to electricity for the Chiusdino and Hellisheidi power plants. Therefore, the PES scheme is found to be the more appropriate allocation scheme. Additionally, the exergy scheme is mandatory for allocating power plants’ environmental impacts at a component level in CHP systems. The main drawback of the PES scheme is its country dependency due to the different fuels used, but reasonable and representative values can be achieved based on average EU heat and power generation efficiencies.

ACS Style

Daniele Fiaschi; Giampaolo Manfrida; Barbara Mendecka; Lorenzo Tosti; Maria Parisi. A Comparison of Different Approaches for Assessing Energy Outputs of Combined Heat and Power Geothermal Plants. Sustainability 2021, 13, 4527 .

AMA Style

Daniele Fiaschi, Giampaolo Manfrida, Barbara Mendecka, Lorenzo Tosti, Maria Parisi. A Comparison of Different Approaches for Assessing Energy Outputs of Combined Heat and Power Geothermal Plants. Sustainability. 2021; 13 (8):4527.

Chicago/Turabian Style

Daniele Fiaschi; Giampaolo Manfrida; Barbara Mendecka; Lorenzo Tosti; Maria Parisi. 2021. "A Comparison of Different Approaches for Assessing Energy Outputs of Combined Heat and Power Geothermal Plants." Sustainability 13, no. 8: 4527.

Conference paper
Published: 16 February 2021 in E3S Web of Conferences
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Ocean Thermal Energy Conversion is an important renewable energy technology aimed at harvesting the large energy resources connected to the temperature gradient between shallow and deep ocean waters, mainly in the tropical region. After the first small-size demonstrators, the current technology is focused on the use of Organic Rankine Cycles, which are suitable for operating with very low temperatures of the resource. With respect to other applications of binary cycles, a large fraction of the output power is consumed for harvesting the resource – that is, in the case of OTEC, for pumping the cold and hot water resource. An exergy analysis of the process (including thermodynamic model of the power cycle as well as heat transfer and friction modelling of the primary resource circuit) was developed and applied to determine optimal conditions (for output power and for exergy efficiency). A parametric analysis examining the main design constraints (temperature range of the condenser and mass flow ratio of hot and cold resource flows) is performed. The cost of power equipment is evaluated applying equipment cost correlations, and an exergo-economic analysis is performed. The results allow to calculate the production cost of electricity and its progressive build-up across the conversion process. A sensitivity analysis with respect to the main design variables is performed.

ACS Style

Lorenzo Talluri; Giampaolo Manfrida; Lorenzo Ciappi. Exergo-economic assessment of OTEC power generation. E3S Web of Conferences 2021, 238, 01015 .

AMA Style

Lorenzo Talluri, Giampaolo Manfrida, Lorenzo Ciappi. Exergo-economic assessment of OTEC power generation. E3S Web of Conferences. 2021; 238 ():01015.

Chicago/Turabian Style

Lorenzo Talluri; Giampaolo Manfrida; Lorenzo Ciappi. 2021. "Exergo-economic assessment of OTEC power generation." E3S Web of Conferences 238, no. : 01015.

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: 26 October 2020 in Energies
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Oscillating water column (OWC) systems are among the most credited solutions for an effective conversion of the notable energy potential conveyed by sea waves. Despite a renewed interest, however, they are often still at a demonstration phase and additional research is required to reach industrial maturity. Within this framework, this study provides a wave-to-wire model for OWC systems based on an impulse air turbine. The model performs a comprehensive simulation of the system to estimate the attendant electric energy production for a specific sea state, based on analytical models of the primary (fixed chamber) and secondary (air turbine) converters coupled with the tertiary converter (electric generator). A rigid piston model is proposed to solve the hydrodynamics, thermodynamics, and hydrodynamics of the chamber, in a coupled fashion with the impulse turbine aerodynamics. This is solved with a novel method by considering the cascades as sets of blades, each one consisting of a finite number of airfoils stacked in the radial direction. The model was applied for two Mediterranean sites located in Tuscany and Sardinia (Italy), which were selected to define the optimal geometry of the turbine for a specified chamber. For each system, the developed analytical wave-to-wire model was applied to calculate the performance parameters and the annual energy production in environmental conditions typical of the Mediterranean Sea. The selected impulse turbines are able to convert 13.69 and 39.36 MWh/year, with an efficiency of 4.95% and 4.76%, respectively, thus proving the interesting prospects of the technology.

ACS Style

Lorenzo Ciappi; Lapo Cheli; Irene Simonetti; Alessandro Bianchini; Giampaolo Manfrida; Lorenzo Cappietti. Wave-to-Wire Model of an Oscillating-Water-Column Wave Energy Converter and Its Application to Mediterranean Energy Hot-Spots. Energies 2020, 13, 5582 .

AMA Style

Lorenzo Ciappi, Lapo Cheli, Irene Simonetti, Alessandro Bianchini, Giampaolo Manfrida, Lorenzo Cappietti. Wave-to-Wire Model of an Oscillating-Water-Column Wave Energy Converter and Its Application to Mediterranean Energy Hot-Spots. Energies. 2020; 13 (21):5582.

Chicago/Turabian Style

Lorenzo Ciappi; Lapo Cheli; Irene Simonetti; Alessandro Bianchini; Giampaolo Manfrida; Lorenzo Cappietti. 2020. "Wave-to-Wire Model of an Oscillating-Water-Column Wave Energy Converter and Its Application to Mediterranean Energy Hot-Spots." Energies 13, no. 21: 5582.

Journal article
Published: 09 July 2020 in Energies
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Geothermal energy could play a crucial role in the European energy market and future scenarios focused on sustainable development. Thanks to its constant supply of concentrated energy, it can support the transition towards a low-carbon economy. In the energy sector, the decision-making process should always be supported by a holistic science-based approach to allow a comprehensive environmental assessment of the technological system, such as the life cycle assessment (LCA) methodology. In the geothermal sector, the decision-making is particularly difficult due to the large variability of reported results on environmental performance across studies. This calls for harmonized guidelines on how to conduct LCAs of geothermal systems to enhance transparency and results comparability, by ensuring consistent methodological choices and providing indications for harmonized results reporting. This work identifies the main critical aspects of performing an LCA of geothermal systems and provides solutions and technical guidance to harmonize its application. The proposed methodological approach is based on experts’ knowledge from both the geothermal and LCA sectors. The recommendations cover all the life cycle phases of geothermal energy production (i.e., construction, operation, maintenance and end of life) as well as a selection of LCA key elements thus providing a thorough base for concerted LCA guidelines for the geothermal sector. The application of such harmonized LCA framework can ensure comparability among LCA results from different geothermal systems and other renewable energy technologies.

ACS Style

Maria Laura Parisi; Melanie Douziech; Lorenzo Tosti; Paula Pérez-López; Barbara Mendecka; Sergio Ulgiati; Daniele Fiaschi; Giampaolo Manfrida; Isabelle Blanc. Definition of LCA Guidelines in the Geothermal Sector to Enhance Result Comparability. Energies 2020, 13, 3534 .

AMA Style

Maria Laura Parisi, Melanie Douziech, Lorenzo Tosti, Paula Pérez-López, Barbara Mendecka, Sergio Ulgiati, Daniele Fiaschi, Giampaolo Manfrida, Isabelle Blanc. Definition of LCA Guidelines in the Geothermal Sector to Enhance Result Comparability. Energies. 2020; 13 (14):3534.

Chicago/Turabian Style

Maria Laura Parisi; Melanie Douziech; Lorenzo Tosti; Paula Pérez-López; Barbara Mendecka; Sergio Ulgiati; Daniele Fiaschi; Giampaolo Manfrida; Isabelle Blanc. 2020. "Definition of LCA Guidelines in the Geothermal Sector to Enhance Result Comparability." Energies 13, no. 14: 3534.

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.

Article
Published: 01 April 2020 in Sustainability
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A life cycle analysis was performed for the assessment of the environmental performances of three existing Italian power plants of comparable nominal power operating with different sources of renewable energy: Geothermal, solar, and wind. Primary data were used for building the life cycle inventories. The results are characterized by employing a wide portfolio of environmental indicators employing the ReCiPe 2016 and the ILCD 2011 Midpoint+ methods; normalization and weighting are also applied using the ReCiPe 2016 method at the endpoint level. The midpoint results demonstrate a good eco-profile of the geothermal power plant compared to other renewable energy systems and a definite step forward over the performance of the national energy mix. The Eco-Point single score calculation showed that wind energy is the best technology with a value of 0.0012 Eco-points/kWh, a result in line with previously documented life cycle analysis studies. Nevertheless, the geothermal power plant achieved a value of 0.0177 Eco-points/kWh which is close to that calculated for the photovoltaic plant (0.0087 Eco-points/kWh) and much lower than the national energy mix one (0.1240 Eco-points/kWh). Also, a scenario analysis allowed for a critical discussion about potential improvements to the environmental performance of the geothermal power plant.

ACS Style

Riccardo Basosi; Roberto Bonciani; Dario Frosali; Giampaolo Manfrida; Maria Laura Parisi; Franco Sansone. Life Cycle Analysis of a Geothermal Power Plant: Comparison of the Environmental Performance with Other Renewable Energy Systems. Sustainability 2020, 12, 2786 .

AMA Style

Riccardo Basosi, Roberto Bonciani, Dario Frosali, Giampaolo Manfrida, Maria Laura Parisi, Franco Sansone. Life Cycle Analysis of a Geothermal Power Plant: Comparison of the Environmental Performance with Other Renewable Energy Systems. Sustainability. 2020; 12 (7):2786.

Chicago/Turabian Style

Riccardo Basosi; Roberto Bonciani; Dario Frosali; Giampaolo Manfrida; Maria Laura Parisi; Franco Sansone. 2020. "Life Cycle Analysis of a Geothermal Power Plant: Comparison of the Environmental Performance with Other Renewable Energy Systems." Sustainability 12, no. 7: 2786.

Preprint
Published: 28 February 2020
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A Life Cycle Analysis was performed considering three existing power plants of comparable size operating with different sources of renewable energy: geothermal, solar and wind. Primary data were used for building the life cycle inventories. The geothermal power plant includes emissions treatment for removal of hydrogen sulfide and mercury. The scenario about the substitution of natural emissions from geothermal energy, with specific reference to the greenhouse effect, is also investigated performing a sensitivity analysis. The results are characterized employing a wide portfolio of environmental indicators employing the Recipe 2016 and the ILCD 2011 Midpoint+ methods; normalization and weighting are also applied using the Recipe 2016 method at endpoint level. The results demonstrate a good eco-profile of geothermal power plant with respect to other renewable energy systems and allow for a critical analysis to support potential improvements of the environmental performances.

ACS Style

Riccardo Basosi; Roberto Bonciani; Dario Frosali; Giampaolo Manfrida; Maria Laura Parisi; Franco Sansone. Life Cycle Analysis of a Geothermal Power Plant: Comparison of the Environmental Performance with Other Renewable Energy Systems. 2020, 1 .

AMA Style

Riccardo Basosi, Roberto Bonciani, Dario Frosali, Giampaolo Manfrida, Maria Laura Parisi, Franco Sansone. Life Cycle Analysis of a Geothermal Power Plant: Comparison of the Environmental Performance with Other Renewable Energy Systems. . 2020; ():1.

Chicago/Turabian Style

Riccardo Basosi; Roberto Bonciani; Dario Frosali; Giampaolo Manfrida; Maria Laura Parisi; Franco Sansone. 2020. "Life Cycle Analysis of a Geothermal Power Plant: Comparison of the Environmental Performance with Other Renewable Energy Systems." , no. : 1.

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.

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: 01 December 2019 in Civil and Environmental Engineering Reports
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The growing demand for electricity produced from renewable sources and the development of new technologies for the combustion of biomass, arose a growing interest on the possible coupling of thermoelectric modules with stove-fireplaces. The current thermoelectric generators have a solid structure, do not produce noise, do not require maintenance and can be used for the recovery of waste heat or excess, at the same time they hold a very low conversion efficiency and they need an adequate cooling system. Nevertheless, they still hold a cost, which is still too high to make them attractive. Nonetheless, if the modules are applied to a heat source which otherwise would be wasted, the attractiveness of the solution certainly rises. In this study, a thermodynamic analysis of a stove-fireplace is presented, considering both combustion process and the flame – walls heat transfer of the. A design solution for a concentrator device to funnel the wasted heat from the fireplace to the thermo-electric modules is also presented.

ACS Style

Andrea Baldini; Luca Cerofolini; Daniele Fiaschi; Giampaolo Manfrida; Lorenzo Talluri. Thermodynamic Assessment on the Integration of Thermo-Electric Modules in a Wood Fireplace. Civil and Environmental Engineering Reports 2019, 29, 218 -235.

AMA Style

Andrea Baldini, Luca Cerofolini, Daniele Fiaschi, Giampaolo Manfrida, Lorenzo Talluri. Thermodynamic Assessment on the Integration of Thermo-Electric Modules in a Wood Fireplace. Civil and Environmental Engineering Reports. 2019; 29 (4):218-235.

Chicago/Turabian Style

Andrea Baldini; Luca Cerofolini; Daniele Fiaschi; Giampaolo Manfrida; Lorenzo Talluri. 2019. "Thermodynamic Assessment on the Integration of Thermo-Electric Modules in a Wood Fireplace." Civil and Environmental Engineering Reports 29, no. 4: 218-235.

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: 18 May 2019 in Energy
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Geothermal power plants can provide clean and renewable energy and can be proposed as integrated units for simultaneous production of cooling and power. This paper presents a cascade arrangement of an organic Rankine cycle (ORC) and a water/lithium bromide (LiBr) absorption chiller (ABS). Starting from a literature reference layout which is taken as benchmark, some improvements are proposed at system level. To assess the performance of the system, a thermodynamic model is developed in EES and the energy and exergy balance is calculated. The proposed system is re-evaluated with reference to resource conditions corresponding to a planned power plant in central Italy, Torre Alfina (TA). A sensitivity analysis is performed in order to investigate the operating range of the plant and the possibility of adapting its design to the requirements of the customers. Under optimized conditions, the TA Case (targeted on a 5 MW power output) showed an energy utilization factor (EUF) of 46.2% and an exergy efficiency of 27.7%, neglecting the brine reinjection loss. The highest exergy destructions occur in the ORC economizer (8.6%), in the ABS generator (6.3%) and absorber (5.5%). The good resource conditions in TA case drive the design optimization to production of power rather than cold.

ACS Style

Martina Leveni; Giampaolo Manfrida; Raffaello Cozzolino; Barbara Mendecka. Energy and exergy analysis of cold and power production from the geothermal reservoir of Torre Alfina. Energy 2019, 180, 807 -818.

AMA Style

Martina Leveni, Giampaolo Manfrida, Raffaello Cozzolino, Barbara Mendecka. Energy and exergy analysis of cold and power production from the geothermal reservoir of Torre Alfina. Energy. 2019; 180 ():807-818.

Chicago/Turabian Style

Martina Leveni; Giampaolo Manfrida; Raffaello Cozzolino; Barbara Mendecka. 2019. "Energy and exergy analysis of cold and power production from the geothermal reservoir of Torre Alfina." Energy 180, no. : 807-818.

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: 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 August 2018 in Energy
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Integration of solar power to Combined Cycle Power Plants is a solution attracting increasing interest, bridging solar thermal technology to a well-proven energy conversion solution. The integration is attractive for countries aiming to pass to natural gas as an energy feedstock and it could improve the environmental performance. In order to identify the performance and potential environmental benefits, a model of the plant was applied. It covered an annual operation period and included the effects of surroundings variables. The model allows to predict the power plant performance, and calculates a complete exergy balance for all the components of the complex plant. The calculations are repeated for referential CCGT and for the Integrated Solar CCGT. A complete exergoeconomic and exergoenvironmental model was applied at the design conditions after evaluating the cost of equipment and their environmental score using a detailed Life Cycle Assessment (LCA) modelling tool. The results, applied to a power plant in Southern Poland, show that the solution can be attractive for improving the environmental performance of a CCGT (CO2 emission factor decreased by 9%), and that the capital cost is only slightly increased so that the rate of return of the investment is only marginally affected.

ACS Style

Giuseppe Bonforte; Jens Buchgeister; Giampaolo Manfrida; Karolina Petela. Exergoeconomic and exergoenvironmental analysis of an integrated solar gas turbine/combined cycle power plant. Energy 2018, 156, 352 -359.

AMA Style

Giuseppe Bonforte, Jens Buchgeister, Giampaolo Manfrida, Karolina Petela. Exergoeconomic and exergoenvironmental analysis of an integrated solar gas turbine/combined cycle power plant. Energy. 2018; 156 ():352-359.

Chicago/Turabian Style

Giuseppe Bonforte; Jens Buchgeister; Giampaolo Manfrida; Karolina Petela. 2018. "Exergoeconomic and exergoenvironmental analysis of an integrated solar gas turbine/combined cycle power plant." Energy 156, no. : 352-359.

Journal article
Published: 01 December 2017 in Energy
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ACS Style

Giampaolo Manfrida; Karolina Petela; Federico Rossi. Natural circulation solar thermal system for water disinfection. Energy 2017, 141, 1204 -1214.

AMA Style

Giampaolo Manfrida, Karolina Petela, Federico Rossi. Natural circulation solar thermal system for water disinfection. Energy. 2017; 141 ():1204-1214.

Chicago/Turabian Style

Giampaolo Manfrida; Karolina Petela; Federico Rossi. 2017. "Natural circulation solar thermal system for water disinfection." Energy 141, no. : 1204-1214.