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Compressed air is crucial on an electric or electrified heavy-duty vehicle. The objective of this work was to experimentally determine the performance parameters of the first prototype of an electric-driven sliding-vane air compressor, specifically designed for electric and electrified heavy-duty vehicles, during the transient conditions of cold start-ups. The transient was analyzed for different thermostatic temperatures: 0 °C, −10 °C, −20 °C, and −30 °C. The air compressor unit was placed in a climatic chamber and connected to the electric grid, the water-cooling loop, and the compressed air measuring and controlling rig. The required start-up time was greater the lower the thermostatic temperature, ranging from 30 min at 0 °C to 221 min at −30 °C and depending largely on the volume of the lubricant oil filled initially. The volume flow rate of the compressed air was lower than nominal at the beginning, but it showed a step increase well beyond nominal when the oil reached 50 °C and then decreased gently towards nominal, while the input power kept steady at nominal after a short initial peak. These facts must be considered when estimating the time and the energy required by the air compressor unit to fill up the compressed air tanks of the vehicles.
Gianluca Valenti; Stefano Murgia; Ida Costanzo; Matteo Scarnera; Francesco Battistella. Experimental Determination of the Performances during the Cold Start-Up of an Air Compressor Unit for Electric and Electrified Heavy-Duty Vehicles. Energies 2021, 14, 3664 .
AMA StyleGianluca Valenti, Stefano Murgia, Ida Costanzo, Matteo Scarnera, Francesco Battistella. Experimental Determination of the Performances during the Cold Start-Up of an Air Compressor Unit for Electric and Electrified Heavy-Duty Vehicles. Energies. 2021; 14 (12):3664.
Chicago/Turabian StyleGianluca Valenti; Stefano Murgia; Ida Costanzo; Matteo Scarnera; Francesco Battistella. 2021. "Experimental Determination of the Performances during the Cold Start-Up of an Air Compressor Unit for Electric and Electrified Heavy-Duty Vehicles." Energies 14, no. 12: 3664.
The sector of thermal energy storage shows a number of alternatives that could have a relevant impact on the future of energy saving as well as renewable energy technologies. Among these, latent heat thermal energy storage technologies show promising results. Technologies that exploit solid-liquid phase change have already been widely proposed, but those technologies show common drawbacks limiting their application, such as high cost, low energy storage density and particularly low heat transfer properties. This work proposes to exploit the liquid-vapor phase transition in closed and constant volumes because it shows higher heat transfer properties. Consequently, the objective is to assess its energy storage performances in target temperature ranges. With respect to previous activity by the authors, this work proposes an exergy analysis of these systems, gives a methodology their deployment, and proposes a comparison between a new storage condition for solar thermal domestic hot water systems exploiting vapor-liquid equilibrium and conventional technologies. The exergy analysis is performed in reduced terms in order to have a generalized approach. Three hypothetical fluids with increasing degree of molecular complexity are considered in order to have a complete overview of the thermodynamic behavior of potential heat storage fluids. The analysis shows that the increased pressure of liquid systems has a major impact on exergy, resulting in vapor-liquid systems having less than 50% of the exergy variation of pressurized liquid systems. This is proven to have no impact on thermal energy storage. For the case study, the proposed methodology indicates that water itself is a strong candidate as a heat storage fluid in the new condition. Comparison shows that the new condition has a higher energy storage capacity at same volume. The useful temperature range is increased by 108% by setting a 10.5% volume vapor fraction at ambient temperature. The resulting improvement gives a 94% higher energy storage, with a maximum operating pressure of the system of less than 5 bar.
Abdullah Bamoshmoosh; Gianluca Valenti. Constant-volume vapor-liquid equilibrium for thermal energy storage: investigation of a new storage condition for solar thermal systems. E3S Web of Conferences 2021, 238, 03004 .
AMA StyleAbdullah Bamoshmoosh, Gianluca Valenti. Constant-volume vapor-liquid equilibrium for thermal energy storage: investigation of a new storage condition for solar thermal systems. E3S Web of Conferences. 2021; 238 ():03004.
Chicago/Turabian StyleAbdullah Bamoshmoosh; Gianluca Valenti. 2021. "Constant-volume vapor-liquid equilibrium for thermal energy storage: investigation of a new storage condition for solar thermal systems." E3S Web of Conferences 238, no. : 03004.
Microgrids represent a flexible way to integrate renewable energy sources with programmable generators and storage systems. In this regard, a synergic integration of those sources is crucial to minimize the operating cost of the microgrid by efficient storage management and generation scheduling. The forecasts of renewable generation can be used to attain optimal management of the controllable units by predictive optimization algorithms. This paper introduces the implementation of a two-layer hierarchical energy management system for islanded photovoltaic microgrids. The first layer evaluates the optimal unit commitment, according to the photovoltaic forecasts, while the second layer deals with the power-sharing in real time, following as close as possible the daily schedule provided by the upper layer while balancing the forecast errors. The energy management system is experimentally tested at the Multi-Good MicroGrid Laboratory under three different photovoltaic forecast models: (i) day-ahead model, (ii) intraday corrections and (iii) nowcasting technique. The experimental study demonstrates the capability of the proposed management system to operate an islanded microgrid in safe conditions, even with inaccurate day-ahead photovoltaic forecasts.
Simone Polimeni; Alfredo Nespoli; Sonia Leva; Gianluca Valenti; Giampaolo Manzolini. Implementation of Different PV Forecast Approaches in a MultiGood MicroGrid: Modeling and Experimental Results. Processes 2021, 9, 323 .
AMA StyleSimone Polimeni, Alfredo Nespoli, Sonia Leva, Gianluca Valenti, Giampaolo Manzolini. Implementation of Different PV Forecast Approaches in a MultiGood MicroGrid: Modeling and Experimental Results. Processes. 2021; 9 (2):323.
Chicago/Turabian StyleSimone Polimeni; Alfredo Nespoli; Sonia Leva; Gianluca Valenti; Giampaolo Manzolini. 2021. "Implementation of Different PV Forecast Approaches in a MultiGood MicroGrid: Modeling and Experimental Results." Processes 9, no. 2: 323.
Stirling units are a viable option for micro-cogeneration applications, but they operate often with multiple daily startups and shutdowns due to the variability of load profiles. This work focused on the experimental and numerical study of a small-size commercial Stirling unit when subjected to cycling operations. First, experimental data about energy flows and emissions were collected during on–off operations. Second, these data were utilized to tune an in-house code for the economic optimization of cogeneration plant scheduling. Lastly, the tuned code was applied to a case study of a residential flat in Northern Italy during a typical winter day to investigate the optimal scheduling of the Stirling unit equipped with a thermal storage tank of diverse sizes. Experimentally, the Stirling unit showed an integrated electric efficiency of 8.9% (8.0%) and thermal efficiency of 91.0% (82.2%), referred to as the fuel lower and, between parenthesis, higher heating value during the on–off cycling test, while emissions showed peaks in NOx and CO up to 100 ppm but shorter than a minute. Numerically, predictions indicated that considering the on–off effects, the optimized operating strategy led to a great reduction of daily startups, with a number lower than 10 per day due to an optimal thermal storage size of 4 kWh. Ultimately, the primary energy saving was 12% and the daily operational cost was 2.9 €/day.
Gianluca Valenti; Aldo Bischi; Stefano Campanari; Paolo Silva; Antonino Ravidà; Ennio Macchi. Experimental and Numerical Study of a Microcogeneration Stirling Unit Under On–Off Cycling Operation. Energies 2021, 14, 801 .
AMA StyleGianluca Valenti, Aldo Bischi, Stefano Campanari, Paolo Silva, Antonino Ravidà, Ennio Macchi. Experimental and Numerical Study of a Microcogeneration Stirling Unit Under On–Off Cycling Operation. Energies. 2021; 14 (4):801.
Chicago/Turabian StyleGianluca Valenti; Aldo Bischi; Stefano Campanari; Paolo Silva; Antonino Ravidà; Ennio Macchi. 2021. "Experimental and Numerical Study of a Microcogeneration Stirling Unit Under On–Off Cycling Operation." Energies 14, no. 4: 801.
Thermal energy storage is of great interest both for the industrial world and for the district heating and cooling sector. Available technologies present drawbacks that reduce the margin of application, such as low energy density, limited temperature range of work, and investment costs. Phase transition is one of the main phenomena that can be exploited for thermal energy storage because of its naturally high energy density. Constant-volume vapor-liquid transition shows higher flexibility and increased heat transfer properties with respect to available technologies. This work presents a description of the behavior of these types of systems. The analysis is carried out through a generalized approach using the Corresponding State Principle. Variation of internal energy as a function of temperature over a fixed range is calculated at constant volume at different values of specific volume. It is shown that, for lower specific volumes, larger temperature ranges of work can be achieved without occurring in the steep pressure increase typically given by the expansion of liquid. Maximum operating temperature range is increased by up to 20% of the critical temperature with minimal energy loss. In optimal subsets of these ranges of temperature, the energy storage capacity of vapor-liquid systems increases at lower volumes, with energy storage capacity increasing to up to 40% with a 50% increase of the reduced volume. This is especially valid for more complex fluids, which are more interesting for these applications because of their higher heat capacity.
Abdullah Bamoshmoosh; Gianluca Valenti. Constant-volume vapor-liquid equilibrium for thermal energy storage: Generalized analysis of pure fluids. E3S Web of Conferences 2020, 197, 01001 .
AMA StyleAbdullah Bamoshmoosh, Gianluca Valenti. Constant-volume vapor-liquid equilibrium for thermal energy storage: Generalized analysis of pure fluids. E3S Web of Conferences. 2020; 197 ():01001.
Chicago/Turabian StyleAbdullah Bamoshmoosh; Gianluca Valenti. 2020. "Constant-volume vapor-liquid equilibrium for thermal energy storage: Generalized analysis of pure fluids." E3S Web of Conferences 197, no. : 01001.
This work reports the measured and derived quantities of an experimental campaign conducted in an existing laundry to record the conditions of the exhaust air of a batch industrial natural gas-fired dryer for cotton flat fabrics, like bed linens or tablecloths. The load of fabrics is 85 kg, referred to the dry fabric. The measured quantities are temperature and velocity in the center of a squared exhaust duct, which are reported along with their measurement uncertainty. The derived quantity is the exhaust air mass flow rate along with its combined uncertainty. In particular, these data can be used to study the feasibility of waste heat recovery strategies, such as that studied in the related research article “Optimal cascade phase change regenerator for waste heat recovery in a batch industrial dryer” [1].
Gianluca Valenti; Camilla Nicol Bonacina; Abdullah Bamoshmoosh. Measured and derived data at the exhaust of a batch industrial dryer. Data in Brief 2020, 32, 106323 .
AMA StyleGianluca Valenti, Camilla Nicol Bonacina, Abdullah Bamoshmoosh. Measured and derived data at the exhaust of a batch industrial dryer. Data in Brief. 2020; 32 ():106323.
Chicago/Turabian StyleGianluca Valenti; Camilla Nicol Bonacina; Abdullah Bamoshmoosh. 2020. "Measured and derived data at the exhaust of a batch industrial dryer." Data in Brief 32, no. : 106323.
Waste heat recovery is one of the main strategies to reduce the use of primary resources. This work develops a cascade phase change regenerator to recover energy from exhaust air to fresh air of a natural gas-fired batch dryer in an existing industrial laundry, taken as a case study, where an experimental campaign is conducted. The regenerator comprises two vertical stoves made of horizontal rod bundles in an aligned configuration to mitigate the fouling. The rods are hollow smooth cylinders that are grouped into sectors, each of which is filled with a phase change material properly selected among paraffins. The number of cylinders per row and the cylinder diameter are investigated by a parametric analysis; the number of sectors and the materials filling each sector are optimized by two alternative algorithms, one based on the process physics and the other on a statistical method. At last, an economic analysis is applied to the optimal configuration. This optimal configuration turns to be an 8-sector regenerator that attains an energy recovered of 61.5% and a net annual saving of 3340 €/year and that requires a total cost of about 9500 €, yielding a payback time lower than 3 years.
Gianluca Valenti; Camilla Nicol Bonacina; Abdullah Bamoshmoosh. Optimal cascade phase change regenerator for waste heat recovery in a batch industrial dryer. Case Studies in Thermal Engineering 2020, 22, 100734 .
AMA StyleGianluca Valenti, Camilla Nicol Bonacina, Abdullah Bamoshmoosh. Optimal cascade phase change regenerator for waste heat recovery in a batch industrial dryer. Case Studies in Thermal Engineering. 2020; 22 ():100734.
Chicago/Turabian StyleGianluca Valenti; Camilla Nicol Bonacina; Abdullah Bamoshmoosh. 2020. "Optimal cascade phase change regenerator for waste heat recovery in a batch industrial dryer." Case Studies in Thermal Engineering 22, no. : 100734.
Engine-driven reciprocating air compressors are employed on fuel-powered heavy vehicles to actuate a number of auxiliary systems, like brakes and suspensions. Electrically-driven sliding-vane air compressors turn particularly suited for electric heavy vehicles. Unlike in fuel-powered vehicles, the compressor is not heated up in the case of electric mobility, a situation that may lead to potential issues in extreme cold weathers. This paper investigates experimentally the start-up of a sliding-vane air compressor designed specifically for electric heavy vehicles. The compressors, equipped with instruments, is positioned in a climatic chamber. During the tests, the chamber is set to a desired ambient temperature, 0, -10, -20, - 30 °C or 20 °C taken as reference following ISO 1217, and the compressor is started-up when a steady-state initial condition is achieved. The delivery pressure is controlled at 10 bar(g) and all measurements are recorded until a temperature of 80 °C is reached in the air-lube oil separator. No issues are encountered during the tests, such as sudden damage due to improper lubrication. Moreover, the curves of the measured temperature within the air-lube oil separator show similar trends but higher initial plateaus and lower slopes at lower ambient temperatures resulting into lower oil flow rates, higher energy spent for heating up the system as well as higher warm-up times, from 15 minutes at 20 °C up to 69 minutes at -30 °C.
Gianluca Valenti; Stefano Murgia; Ida Costanzo; Antonino Ravidà; Giovanni Pio Piscopiello. Experimental investigation on the extreme cold start-up of an air compressor for electric heavy vehicles. IOP Conference Series: Materials Science and Engineering 2019, 604, 012065 .
AMA StyleGianluca Valenti, Stefano Murgia, Ida Costanzo, Antonino Ravidà, Giovanni Pio Piscopiello. Experimental investigation on the extreme cold start-up of an air compressor for electric heavy vehicles. IOP Conference Series: Materials Science and Engineering. 2019; 604 (1):012065.
Chicago/Turabian StyleGianluca Valenti; Stefano Murgia; Ida Costanzo; Antonino Ravidà; Giovanni Pio Piscopiello. 2019. "Experimental investigation on the extreme cold start-up of an air compressor for electric heavy vehicles." IOP Conference Series: Materials Science and Engineering 604, no. 1: 012065.
Ammonia is a promising solvent for the chemical absorption of carbon dioxide owing to its characteristics of low toxicity, low degradation, low cost, and low heat of desorption. The present work evaluates the energy and economic performances of the aqueous ammonia technology applied to a coal-fired power plant. First, the kinetics of absorption are characterized in the Aspen Plus software and are calibrated against the experimental data from the Munmorah pilot plant. Then, the validated model is used for sizing the full-scale plant columns and for simulating the overall capture plant. After determining the sizes of the plant components and their energy consumptions, the capture plant is integrated with the coal-fired power plant, and the economic analysis is assessed with both retrofitted and green-field approaches as described in reports from the European Benchmarking Task Force and the United States National Energy Technology Laboratory, respectively. The novelties presented here are the new approach in the absorption reactions implemented in the rate-based model, which changes the dependency of the ammonia concentration in the absorption process, as well as the full economic analysis with both retrofitted and green-field assumptions, which enable a sound comparison of the outcomes. The results with the retrofitted approach compared with the monoethanolamine case of the European Benchmarking Task Force report returned higher electric efficiency (36.3% versus 33.50%), lower levelized cost of electricity (87.66 €/MWhel versus 92.27 €/MWhel), and lower cost of carbon dioxide avoided (47.03 €/tonCO2 versus 51.62 €/tonCO2). The results using the green-field approach compared against the Cansolv case of the National Energy Technology Laboratory report returned higher electric efficiency (33.06% versus 32.50%), lower cost of electricity (124.3 $/MWhel versus 133.2 $/MWhel) and lower cost of carbon dioxide avoided (66.5 $/tonCO2 versus 75.25 $/tonCO2). In both comparisons, aqueous ammonia had appreciably better performance than the ammine reference cases.
Davide Bonalumi; Stefano Lillia; Gianluca Valenti. Rate-based simulation and techno-economic analysis of coal-fired power plants with aqueous ammonia carbon capture. Energy Conversion and Management 2019, 199, 111966 .
AMA StyleDavide Bonalumi, Stefano Lillia, Gianluca Valenti. Rate-based simulation and techno-economic analysis of coal-fired power plants with aqueous ammonia carbon capture. Energy Conversion and Management. 2019; 199 ():111966.
Chicago/Turabian StyleDavide Bonalumi; Stefano Lillia; Gianluca Valenti. 2019. "Rate-based simulation and techno-economic analysis of coal-fired power plants with aqueous ammonia carbon capture." Energy Conversion and Management 199, no. : 111966.
The industrial sector accounts for one third of the global energy use, mainly due to the energy-intensive industries. Waste heat recovery plays a major role among the advances that can lead to potential savings in these industries. The present work proposes an air compressor that generates industrial compressed air in a novel manner only by recovering heat from exhaust gases, not by consuming electric power, and employing readily available technologies transferred from other sectors. The proposed system is an externally-heated open-loop Brayton cycle operating with air in which a fraction of the compressed air from the compressor is delivered as product, while the remainder is heated up and processed in the expander. In its turn, the expander drives only the compressor and not also an electric generator as in conventional cycles. The system is simply realized combining a single- or a two-stage turbocharger from marine reciprocating engines and a recovery heat exchanger. In single-stage, it can deliver compressed air at a pressure up to 500 kPa, while in two-stage over 1000 kPa. Here, the two-stage configuration is applied to a container glass manufacturing plant and simulated accurately with the code Aspen Plus and Aspen EDR. This work demonstrates that the system could be realized with proven technology from other industrial sectors. It indicates also that 2342 m3/h of compressed air at 800 kPa can be produced from the exhaust gas at 12,000 m3/h (referred to 0 °C and 101.325 kPa) and 560 °C. The performance is affected strongly by the ambient air condition and the furnace load with variations of the compressed air rate ranging from −92% up to +52% in the extreme conditions. The intercooling power is typically around just 35% of the waste heat recovery and, in any case, always lower than 50%. The gross and net equivalent electric efficiencies are in the range 12–16% and 10–14%, respectively, similarly to conventional heat recovery power plants of same size. The performance can be further improved by employing the hot air from the expander as preheated combustion air or for cogeneration. Ultimately, with respect to conventional plants, the system is a simpler technology operating with a harmless fluid, requiring a lower cooling power and a smaller footprint.
Gianluca Valenti; Alessandro Valenti; Simone Staboli. Proposal of a thermally-driven air compressor for waste heat recovery. Energy Conversion and Management 2019, 196, 1113 -1125.
AMA StyleGianluca Valenti, Alessandro Valenti, Simone Staboli. Proposal of a thermally-driven air compressor for waste heat recovery. Energy Conversion and Management. 2019; 196 ():1113-1125.
Chicago/Turabian StyleGianluca Valenti; Alessandro Valenti; Simone Staboli. 2019. "Proposal of a thermally-driven air compressor for waste heat recovery." Energy Conversion and Management 196, no. : 1113-1125.
Stefano Lillia; Davide Bonalumi; Philip L. Fosbøl; Kaj Thomsen; Indira Jayaweera; Gianluca Valenti. Thermodynamic and kinetic properties of NH3-K2CO3-CO2-H2O system for carbon capture applications. International Journal of Greenhouse Gas Control 2019, 85, 121 -131.
AMA StyleStefano Lillia, Davide Bonalumi, Philip L. Fosbøl, Kaj Thomsen, Indira Jayaweera, Gianluca Valenti. Thermodynamic and kinetic properties of NH3-K2CO3-CO2-H2O system for carbon capture applications. International Journal of Greenhouse Gas Control. 2019; 85 ():121-131.
Chicago/Turabian StyleStefano Lillia; Davide Bonalumi; Philip L. Fosbøl; Kaj Thomsen; Indira Jayaweera; Gianluca Valenti. 2019. "Thermodynamic and kinetic properties of NH3-K2CO3-CO2-H2O system for carbon capture applications." International Journal of Greenhouse Gas Control 85, no. : 121-131.
Gianluca Valenti; Davide Bonalumi. Chemical Absorption by Aqueous Solution of Ammonia. Carbon Capture, Utilization and Sequestration 2018, 1 .
AMA StyleGianluca Valenti, Davide Bonalumi. Chemical Absorption by Aqueous Solution of Ammonia. Carbon Capture, Utilization and Sequestration. 2018; ():1.
Chicago/Turabian StyleGianluca Valenti; Davide Bonalumi. 2018. "Chemical Absorption by Aqueous Solution of Ammonia." Carbon Capture, Utilization and Sequestration , no. : 1.
Antonio Giuffrida; Gianluca Valenti; Davide Palamini; Luigi Solazzi. On the conceptual design of the novel balanced rolling piston expander. Case Studies in Thermal Engineering 2018, 12, 38 -46.
AMA StyleAntonio Giuffrida, Gianluca Valenti, Davide Palamini, Luigi Solazzi. On the conceptual design of the novel balanced rolling piston expander. Case Studies in Thermal Engineering. 2018; 12 ():38-46.
Chicago/Turabian StyleAntonio Giuffrida; Gianluca Valenti; Davide Palamini; Luigi Solazzi. 2018. "On the conceptual design of the novel balanced rolling piston expander." Case Studies in Thermal Engineering 12, no. : 38-46.
The absorption reaction between aqueous NH3 and CO2 was studied using the Wetted Wall Column. A total of 27 different cases are investigated in the region defined by temperatures from 15 °C to 35 °C, NH3 concentrations from 5% to 15%, which are the typical solvent conditions in absorption columns, and lastly CO2 loadings from 0.2 to 0.6. The resulting overall mass transfer coefficient of absorption measured follows the trends described by the modelling of the reactor and the equations used to describe the rate of the absorption reactions. Moreover, the overall mass transfer coefficient of absorption is in agreement with data available in the literature, valid in smaller portions of the investigated region. From the data analysis, the kinetics of the absorption reactions in the liquid phase is characterized. The equation proposed to fit the data is a power law equation which reproduces the experimental results measured at different CO2 loadings. This represents a novelty because in literature the kinetic model of the reaction is usually fitted only to data for unloaded solutions (CO2 loading equal to zero). Hence, in this case there is an experimental evidence that the kinetic model holds true in every loading conditions. The kinetic model intercept the values found in literature in every range of concentration. Consequently, the model is valid in every conditions and the rate of the reaction between NH3 and CO2 in liquid phase is described with an Arrhenius constant with a pre-exponential factor of 1.41·108 [mol/(m3s)] and an activation energy of 60,680 [J/mol], a linear dependence on the CO2 concentration and a dependence on the NH3 with an exponent γ = 1.89. The proposed equation is found to be appropriate for implementation into process simulation software.
Stefano Lillia; Davide Bonalumi; Philip L. Fosbøl; Kaj Thomsen; Gianluca Valenti. Experimental study of the aqueous CO2-NH3 rate of reaction for temperatures from 15 °C to 35 °C, NH3 concentrations from 5% to 15% and CO2 loadings from 0.2 to 0.6. International Journal of Greenhouse Gas Control 2018, 70, 117 -127.
AMA StyleStefano Lillia, Davide Bonalumi, Philip L. Fosbøl, Kaj Thomsen, Gianluca Valenti. Experimental study of the aqueous CO2-NH3 rate of reaction for temperatures from 15 °C to 35 °C, NH3 concentrations from 5% to 15% and CO2 loadings from 0.2 to 0.6. International Journal of Greenhouse Gas Control. 2018; 70 ():117-127.
Chicago/Turabian StyleStefano Lillia; Davide Bonalumi; Philip L. Fosbøl; Kaj Thomsen; Gianluca Valenti. 2018. "Experimental study of the aqueous CO2-NH3 rate of reaction for temperatures from 15 °C to 35 °C, NH3 concentrations from 5% to 15% and CO2 loadings from 0.2 to 0.6." International Journal of Greenhouse Gas Control 70, no. : 117-127.
Aleksandra Sveshnikova; Gioele Di Marcoberardino; Claudio Pirrone; Aldo Bischi; Gianluca Valenti; Alexander Ustinov; Stefano Campanari. The Impact of Humidification Temperature on a 1 kW Proton Exchange Membrane Fuel Cell Stack. Energy Procedia 2017, 142, 1661 -1667.
AMA StyleAleksandra Sveshnikova, Gioele Di Marcoberardino, Claudio Pirrone, Aldo Bischi, Gianluca Valenti, Alexander Ustinov, Stefano Campanari. The Impact of Humidification Temperature on a 1 kW Proton Exchange Membrane Fuel Cell Stack. Energy Procedia. 2017; 142 ():1661-1667.
Chicago/Turabian StyleAleksandra Sveshnikova; Gioele Di Marcoberardino; Claudio Pirrone; Aldo Bischi; Gianluca Valenti; Alexander Ustinov; Stefano Campanari. 2017. "The Impact of Humidification Temperature on a 1 kW Proton Exchange Membrane Fuel Cell Stack." Energy Procedia 142, no. : 1661-1667.
Marco Astolfi; Anton Marco Fantolini; Gianluca Valenti; Salvatore De Rinaldis; Luca Davide Inglese; Ennio Macchi. Cryogenic ORC To Enhance The Efficiency Of LNG Regasification Terminals. Energy Procedia 2017, 129, 42 -49.
AMA StyleMarco Astolfi, Anton Marco Fantolini, Gianluca Valenti, Salvatore De Rinaldis, Luca Davide Inglese, Ennio Macchi. Cryogenic ORC To Enhance The Efficiency Of LNG Regasification Terminals. Energy Procedia. 2017; 129 ():42-49.
Chicago/Turabian StyleMarco Astolfi; Anton Marco Fantolini; Gianluca Valenti; Salvatore De Rinaldis; Luca Davide Inglese; Ennio Macchi. 2017. "Cryogenic ORC To Enhance The Efficiency Of LNG Regasification Terminals." Energy Procedia 129, no. : 42-49.
Stefano Murgia; Gianluca Valenti; Daniele Colletta; Ida Costanzo; Giulio Contaldi. Experimental investigation into an ORC-based low-grade energy recovery system equipped with sliding-vane expander using hot oil from an air compressor as thermal source. Energy Procedia 2017, 129, 339 -346.
AMA StyleStefano Murgia, Gianluca Valenti, Daniele Colletta, Ida Costanzo, Giulio Contaldi. Experimental investigation into an ORC-based low-grade energy recovery system equipped with sliding-vane expander using hot oil from an air compressor as thermal source. Energy Procedia. 2017; 129 ():339-346.
Chicago/Turabian StyleStefano Murgia; Gianluca Valenti; Daniele Colletta; Ida Costanzo; Giulio Contaldi. 2017. "Experimental investigation into an ORC-based low-grade energy recovery system equipped with sliding-vane expander using hot oil from an air compressor as thermal source." Energy Procedia 129, no. : 339-346.
Lube-oil injection is used in positive-displacement compressors and, among them, in sliding-vane machines to guarantee the correct lubrication of the moving parts and as sealing to prevent air leakage. Furthermore, lube-oil injection allows to exploit lubricant also as thermal ballast with a great thermal capacity to minimize the temperature increase during the compression. This study presents the design of a two-stage sliding-vane rotary compressor in which the air cooling is operated by high-pressure cold oil injection into a connection duct between the two stages. The heat exchange between the atomized oil jet and the air results in a decrease of the air temperature before the second stage, improving the overall system efficiency. This cooling system is named here intracooling, as opposed to intercooling. The oil injection is realized via pressure-swirl nozzles, both within the compressors and inside the intracooling duct. The design of the two-stage sliding-vane compressor is accomplished by way of a lumped parameter model. The model predicts an input power reduction as large as 10% for intercooled and intracooled two-stage compressors, the latter being slightly better, with respect to a conventional single-stage compressor for compressed air applications. An experimental campaign is conducted on a first prototype that comprises the low-pressure compressor and the intracooling duct, indicating that a significant temperature reduction is achieved in the duct.
Stefano Murgia; Gianluca Valenti; Ida Costanzo; Daniele Colletta; Giulio Contaldi. An intracooling system for a novel two-stage sliding-vane air compressor. IOP Conference Series: Materials Science and Engineering 2017, 232, 012054 .
AMA StyleStefano Murgia, Gianluca Valenti, Ida Costanzo, Daniele Colletta, Giulio Contaldi. An intracooling system for a novel two-stage sliding-vane air compressor. IOP Conference Series: Materials Science and Engineering. 2017; 232 (1):012054.
Chicago/Turabian StyleStefano Murgia; Gianluca Valenti; Ida Costanzo; Daniele Colletta; Giulio Contaldi. 2017. "An intracooling system for a novel two-stage sliding-vane air compressor." IOP Conference Series: Materials Science and Engineering 232, no. 1: 012054.
Indira Jayaweera; Palitha Jayaweera; Prodip Kundu; Andre Anderko; Kaj Thomsen; Gianluca Valenti; Davide Bonalumi; Stefano Lillia. Results from Process Modeling of the Mixed-salt Technology for CO2 Capture from Post-combustion-related Applications. Energy Procedia 2017, 114, 771 -780.
AMA StyleIndira Jayaweera, Palitha Jayaweera, Prodip Kundu, Andre Anderko, Kaj Thomsen, Gianluca Valenti, Davide Bonalumi, Stefano Lillia. Results from Process Modeling of the Mixed-salt Technology for CO2 Capture from Post-combustion-related Applications. Energy Procedia. 2017; 114 ():771-780.
Chicago/Turabian StyleIndira Jayaweera; Palitha Jayaweera; Prodip Kundu; Andre Anderko; Kaj Thomsen; Gianluca Valenti; Davide Bonalumi; Stefano Lillia. 2017. "Results from Process Modeling of the Mixed-salt Technology for CO2 Capture from Post-combustion-related Applications." Energy Procedia 114, no. : 771-780.
Environmental and technical aspects of four supercritical (SC) pulverized-coal processes with post-combustion carbon capture and storage (CCS) are evaluated in the present work. The post-combustion CCS technologies (e.g. MDEA, aqueous ammonia and Calcium Looping (CaL) are compared to the benchmark case represented by the SC pulverized coal without CCS). Some important key performance indicators (e.g. net electrical power, energy conversion efficiency, carbon capture rate, specific CO2 emissions, SPECCA) are calculated based on process modeling and simulation data. The focus of the present work lies in the environmental evaluation, using the Life Cycle Analysis (LCA) methodology, of the processes considered. The system boundaries include: i) power production from coal coupled to energy efficient CCS technologies based on post-combustion capture; ii) upstream processes such as extraction and processing of coal, limestone, solvents used post-combustion CCS, as well as power plant, coal mine, CO2 pipelines construction and commissioning and iii) downstream processes: CO2 compression, transport and storage (for the CCS case) as well as power plant, CCS units, coal mine and CO2 pipelines decommissioning. GaBi6 software was used to perform a “cradle-to-grave” LCA study, to calculate and compare different impact categories, according to CML 2001 impact assessment method. All results are reported to one MWh of net energy produced in the power plant. Discussions about the most significant environmental impact categories are reported leading to the conclusions that the introduction of the CCS technologies decreases the global warming potential (GWP) indicator, but all the other environmental categories increase with respect to the benchmark case. There is also a competition between the aqueous ammonia adsorption and CaL for some impact categories (other than GWP). The implementation of these new CCS technologies is more favorable than the traditional amine-based CO2 capture
Letitia Petrescu; Davide Bonalumi; Gianluca Valenti; Ana-Maria Cormos; Calin-Cristian Cormos. Life Cycle Assessment for supercritical pulverized coal power plants with post-combustion carbon capture and storage. Journal of Cleaner Production 2017, 157, 10 -21.
AMA StyleLetitia Petrescu, Davide Bonalumi, Gianluca Valenti, Ana-Maria Cormos, Calin-Cristian Cormos. Life Cycle Assessment for supercritical pulverized coal power plants with post-combustion carbon capture and storage. Journal of Cleaner Production. 2017; 157 ():10-21.
Chicago/Turabian StyleLetitia Petrescu; Davide Bonalumi; Gianluca Valenti; Ana-Maria Cormos; Calin-Cristian Cormos. 2017. "Life Cycle Assessment for supercritical pulverized coal power plants with post-combustion carbon capture and storage." Journal of Cleaner Production 157, no. : 10-21.