The Experts below are selected from a list of 1203 Experts worldwide ranked by ideXlab platform

Francesco Calise - One of the best experts on this subject based on the ideXlab platform.

  • a novel hybrid Polygeneration System supplying energy and desalinated water by renewable sources in pantelleria island
    Energy, 2017
    Co-Authors: Francesco Calise, Adriano Macaluso, Antonio Piacentino, Laura Vanoli
    Abstract:

    In this paper a thermoeconomic analysis of a novel hybrid Renewable Polygeneration System connected to a district heating and cooling network is presented. The plant is powered simultaneously by solar and geothermal sources, producing electricity, desalinated water, heat and cooling energy. System layout includes Parabolic Through Collector (PTC) field, geothermal wells, Organic Rankine Cycle (ORC) unit and a Multi-Effect Desalination (MED) System. Cooling and thermal demands are calculated by suitable building dynamic simulation models, calibrated for Pantelleria Island. Electrical demand is obtained by measured data. A detailed control strategy has been implemented in order to prevent any heat dissipation, to match the appropriate operating temperature levels in each component, to avoid a too low temperature of geothermal fluid reinjected in the wells and to manage the priority of space heating and cooling process. A 1-year dynamic simulation has been performed and results analyzed on daily, monthly and yearly basis. The System achieved an SPB equal to 8.50 and it resulted capable to cover the energy demands of a small community. Moreover, the plant is capable to cover the fresh water demand of the Pantelleria Island.

  • a novel Polygeneration System integrating photovoltaic thermal collectors solar assisted heat pump adsorption chiller and electrical energy storage dynamic and energy economic analysis
    Energy Conversion and Management, 2017
    Co-Authors: Francesco Calise, Rafal Damian Figaj, Laura Vanoli
    Abstract:

    Abstract In this paper a dynamic simulation model and a thermo-economic analysis of a novel Polygeneration System are presented. The System includes photovoltaic/thermal collectors coupled with a solar-assisted heat pump, an adsorption chiller and an electrical energy storage. The modelled plant supplies electrical energy, space heating and cooling and domestic hot water. The produced solar thermal energy is used during the winter to supply the heat pump evaporator, providing the required space heating. In summer, solar thermal energy is used to drive an adsorption chiller providing the required space cooling. All year long, solar thermal energy in excess, with respect to the space heating and cooling demand, is used to produce domestic hot water. The produced electrical energy is self-consumed by both user and System auxiliary equipment and/or supplied to the grid. The System model includes a detailed electrical energy model for user storage and exchange with the grid along with a detailed building model. This study is a continuation of previous works recently presented by the authors. In particular, the present paper focuses on the real electrical demands of several types of users and on the analysis of the comfort of building users. Differently from the works previously published by the authors, the present work bases the calculations on measured electrical demands of real users (fitness center and offices). The System performance is analyzed with two different electricity supply contracts: net metering and simplified purchase/resale arrangement. Daily, weekly and yearly results are presented. Finally, a sensitivity analysis is performed in order to determine the System performance as a function of the System main design/control parameters and to evaluate the minimum Simple Pay-Back period. The results outlined a share of the electrical energy storage System on the self-consumed electrical energy of about 20%. The economic profitability is better in case of net metering contract compared to the simplified purchase/resale arrangement one. Moreover, a Simple Pay-Back of about 15 years is achieved for the best configuration, decreasing to 5.6 years in case of capital investment incentive of 65%. The best System configuration, in terms of solar field area, for the fitness center user ranges from 250 to 300 m 2 .

  • Polygeneration System based on PEMFC, CPVT and electrolyzer: Dynamic simulation and energetic and economic analysis
    Applied Energy, 2017
    Co-Authors: Francesco Calise, Rafal Damian Figaj, Nicola Massarotti, Alessandro Mauro, Laura Vanoli
    Abstract:

    This paper presents a dynamic simulation model and an energetic and economic analysis of novel Polygeneration System. The System integrates: cogenerative Proton Exchange Membrane Fuel Cell (PEMFC), Concentrated PhotoVoltaic-Thermal (CPVT) collectors, alkaline electrolyzer and single-stage LiBr/H2O absorption chiller. The plant is designed to supply electrical energy, space heating or cooling and domestic hot water for a small university building. The System produces hydrogen and oxygen, the first one is stored and then it is supplied to the fuel cell, while the second one is sold. The electrolyzer System is powered only by the CPVT collectors, only a small amount of the solar electrical energy is available to the user. Such electric energy along with the one produced by the PEM fuel cell are used by the user and/or supplied to the grid. The System is designed and dynamically simulated using TRNSYS software package. This study is based on a model previously developed by the authors. In particular, the System was modified in order to implement the new components (CPVT, alkaline electrolyzer, hydrogen and oxygen System) in this work. Special attention is paid to the control strategy of the proposed System in order to achieve the optimal System configuration. Daily, weekly and yearly results carried out with the dynamic simulation are presented. Finally, a sensitivity analysis was performed in order to determine the System performance as a function of the main design parameters. The energetic and economic analysis shows that the System can ensure significant energy savings and it can be profitable in presence of a capital investment incentive. The total energy efficiency of the CPVT collectors, calculated with respect to the beam radiation, is above 80% and the fuel cell electrical and thermal efficiencies resulted 35.0% and 43.4%, respectively. The hydrogen production of the electrolyzer System covers 4.3% of the fuel cell hydrogen demand. The Simple Pay Back period, in case of incentive, results of about 5 years when the optimal FC nominal power of 100 kW is selected.

  • exergetic and exergoeconomic analysis of a novel hybrid solar geothermal Polygeneration System producing energy and water
    Energy Conversion and Management, 2016
    Co-Authors: Francesco Calise, Massimo Dentice Daccadia, Adriano Macaluso, Antonio Piacentino, Laura Vanoli
    Abstract:

    Abstract A dynamic simulation model of a novel solar–geothermal Polygeneration System and the related exergetic and exergoeconomic analyses are presented in this paper. The plant is designed in order to supply electrical, thermal and cooling energy and fresh water for a small community, connected to a district heating and cooling network. The hybrid System is equipped with an Organic Rankine Cycle fueled by medium-enthalpy geothermal energy and by a Parabolic Trough Collector solar field. Geothermal brine is also used for space heating and cooling purposes. Finally, geothermal fluid supplies heat to a Multi-Effect Distillation unit, producing also desalinized water from seawater. Dynamic simulations were performed in order to design the System. The overall simulation model, implemented in TRNSYS environment, includes detailed algorithms for the simulation of System components. Detailed control strategies were included in the model in order to properly manage the System. An exergetic and exergoeconomic analysis is also implemented. The exergetic analysis allows to identify all the aspects that affect the global exergy efficiency, in order to suggest possible System enhancements. The accounting of exergoeconomic costs aims at establishing a monetary value to all material and energy flows, then providing a reasonable basis for price allocation. The analysis is applied to integral values of energy and a comparison of results between summer and winter season is performed. Results are analyzed on different time bases presenting energetic, exergetic, economic and exergoeconomic performance data. Results show that global exergy efficiency varies between 40% and 50% during the “Thermal Recovery Mode” operation and between 16% and 20% during the “Cooling mode” operation. It was also found that electricity, chilled water, cooling water and desalinated water exergoeconomic costs vary respectively in the ranges 0.1475–0.1722 €/kW h, 0.1863–0.1888 €/kW h ex , 0.01612–0.01702 €/kW h ex and 0.5695–0.6023 €/kW h ex .

  • a novel solar assisted heat pump driven by photovoltaic thermal collectors dynamic simulation and thermoeconomic optimization
    Energy, 2016
    Co-Authors: Francesco Calise, Rafal Damian Figaj, Massimo Dentice Daccadia, Laura Vanoli
    Abstract:

    This paper presents a dynamic simulation model and a thermo-economic analysis of a novel Polygeneration System based on a solar-assisted heat pump and an adsorption chiller, both driven by PVT (photovoltaic/thermal) collectors. The aim of this work is to design and dynamically simulate a novel ultra-high efficient solar heating and cooling System. The overall plant layout is designed to supply electricity, space heating and cooling and domestic hot water for a small residential building. The System combines solar cooling, solar-assisted heat pump and photovoltaic/thermal collector technologies in a novel solar Polygeneration System. In fact, the Polygeneration System is based on a PVT solar field, coupled with a water-to-water electric heat pump or to an adsorption chiller. PVT collectors simultaneously produce electricity and thermal energy. During the winter, hot water produced by PVT collectors primarily supplies the evaporator of the heat pump, whereas in summer, solar energy supplies an adsorption chiller providing the required space cooling. All year long, solar thermal energy in excess is converted into DHW (domestic hot water). The System model was developed in TRNSYS environment. 1-year dynamic simulations are performed for different case studies in various weather conditions. The results are analysed on different time bases presenting energetic, environmental and economic performance data. Finally, a sensitivity analysis and a thermoeconomic optimization were performed, in order to determine the set of System design/control parameters that minimize the simple pay-back period. The results showed a total energy efficiency of the PVT of 49%, a heat pump yearly coefficient of performance for heating mode above 4 and a coefficient of performance of the adsorption chiller of 0.55. Finally, it is also concluded that System performance is highly sensitive to the PVT field area. The System is profitable when a capital investment subsidy of 50% is considered.

Laura Vanoli - One of the best experts on this subject based on the ideXlab platform.

  • a novel hybrid Polygeneration System supplying energy and desalinated water by renewable sources in pantelleria island
    Energy, 2017
    Co-Authors: Francesco Calise, Adriano Macaluso, Antonio Piacentino, Laura Vanoli
    Abstract:

    In this paper a thermoeconomic analysis of a novel hybrid Renewable Polygeneration System connected to a district heating and cooling network is presented. The plant is powered simultaneously by solar and geothermal sources, producing electricity, desalinated water, heat and cooling energy. System layout includes Parabolic Through Collector (PTC) field, geothermal wells, Organic Rankine Cycle (ORC) unit and a Multi-Effect Desalination (MED) System. Cooling and thermal demands are calculated by suitable building dynamic simulation models, calibrated for Pantelleria Island. Electrical demand is obtained by measured data. A detailed control strategy has been implemented in order to prevent any heat dissipation, to match the appropriate operating temperature levels in each component, to avoid a too low temperature of geothermal fluid reinjected in the wells and to manage the priority of space heating and cooling process. A 1-year dynamic simulation has been performed and results analyzed on daily, monthly and yearly basis. The System achieved an SPB equal to 8.50 and it resulted capable to cover the energy demands of a small community. Moreover, the plant is capable to cover the fresh water demand of the Pantelleria Island.

  • a novel Polygeneration System integrating photovoltaic thermal collectors solar assisted heat pump adsorption chiller and electrical energy storage dynamic and energy economic analysis
    Energy Conversion and Management, 2017
    Co-Authors: Francesco Calise, Rafal Damian Figaj, Laura Vanoli
    Abstract:

    Abstract In this paper a dynamic simulation model and a thermo-economic analysis of a novel Polygeneration System are presented. The System includes photovoltaic/thermal collectors coupled with a solar-assisted heat pump, an adsorption chiller and an electrical energy storage. The modelled plant supplies electrical energy, space heating and cooling and domestic hot water. The produced solar thermal energy is used during the winter to supply the heat pump evaporator, providing the required space heating. In summer, solar thermal energy is used to drive an adsorption chiller providing the required space cooling. All year long, solar thermal energy in excess, with respect to the space heating and cooling demand, is used to produce domestic hot water. The produced electrical energy is self-consumed by both user and System auxiliary equipment and/or supplied to the grid. The System model includes a detailed electrical energy model for user storage and exchange with the grid along with a detailed building model. This study is a continuation of previous works recently presented by the authors. In particular, the present paper focuses on the real electrical demands of several types of users and on the analysis of the comfort of building users. Differently from the works previously published by the authors, the present work bases the calculations on measured electrical demands of real users (fitness center and offices). The System performance is analyzed with two different electricity supply contracts: net metering and simplified purchase/resale arrangement. Daily, weekly and yearly results are presented. Finally, a sensitivity analysis is performed in order to determine the System performance as a function of the System main design/control parameters and to evaluate the minimum Simple Pay-Back period. The results outlined a share of the electrical energy storage System on the self-consumed electrical energy of about 20%. The economic profitability is better in case of net metering contract compared to the simplified purchase/resale arrangement one. Moreover, a Simple Pay-Back of about 15 years is achieved for the best configuration, decreasing to 5.6 years in case of capital investment incentive of 65%. The best System configuration, in terms of solar field area, for the fitness center user ranges from 250 to 300 m 2 .

  • Polygeneration System based on PEMFC, CPVT and electrolyzer: Dynamic simulation and energetic and economic analysis
    Applied Energy, 2017
    Co-Authors: Francesco Calise, Rafal Damian Figaj, Nicola Massarotti, Alessandro Mauro, Laura Vanoli
    Abstract:

    This paper presents a dynamic simulation model and an energetic and economic analysis of novel Polygeneration System. The System integrates: cogenerative Proton Exchange Membrane Fuel Cell (PEMFC), Concentrated PhotoVoltaic-Thermal (CPVT) collectors, alkaline electrolyzer and single-stage LiBr/H2O absorption chiller. The plant is designed to supply electrical energy, space heating or cooling and domestic hot water for a small university building. The System produces hydrogen and oxygen, the first one is stored and then it is supplied to the fuel cell, while the second one is sold. The electrolyzer System is powered only by the CPVT collectors, only a small amount of the solar electrical energy is available to the user. Such electric energy along with the one produced by the PEM fuel cell are used by the user and/or supplied to the grid. The System is designed and dynamically simulated using TRNSYS software package. This study is based on a model previously developed by the authors. In particular, the System was modified in order to implement the new components (CPVT, alkaline electrolyzer, hydrogen and oxygen System) in this work. Special attention is paid to the control strategy of the proposed System in order to achieve the optimal System configuration. Daily, weekly and yearly results carried out with the dynamic simulation are presented. Finally, a sensitivity analysis was performed in order to determine the System performance as a function of the main design parameters. The energetic and economic analysis shows that the System can ensure significant energy savings and it can be profitable in presence of a capital investment incentive. The total energy efficiency of the CPVT collectors, calculated with respect to the beam radiation, is above 80% and the fuel cell electrical and thermal efficiencies resulted 35.0% and 43.4%, respectively. The hydrogen production of the electrolyzer System covers 4.3% of the fuel cell hydrogen demand. The Simple Pay Back period, in case of incentive, results of about 5 years when the optimal FC nominal power of 100 kW is selected.

  • exergetic and exergoeconomic analysis of a novel hybrid solar geothermal Polygeneration System producing energy and water
    Energy Conversion and Management, 2016
    Co-Authors: Francesco Calise, Massimo Dentice Daccadia, Adriano Macaluso, Antonio Piacentino, Laura Vanoli
    Abstract:

    Abstract A dynamic simulation model of a novel solar–geothermal Polygeneration System and the related exergetic and exergoeconomic analyses are presented in this paper. The plant is designed in order to supply electrical, thermal and cooling energy and fresh water for a small community, connected to a district heating and cooling network. The hybrid System is equipped with an Organic Rankine Cycle fueled by medium-enthalpy geothermal energy and by a Parabolic Trough Collector solar field. Geothermal brine is also used for space heating and cooling purposes. Finally, geothermal fluid supplies heat to a Multi-Effect Distillation unit, producing also desalinized water from seawater. Dynamic simulations were performed in order to design the System. The overall simulation model, implemented in TRNSYS environment, includes detailed algorithms for the simulation of System components. Detailed control strategies were included in the model in order to properly manage the System. An exergetic and exergoeconomic analysis is also implemented. The exergetic analysis allows to identify all the aspects that affect the global exergy efficiency, in order to suggest possible System enhancements. The accounting of exergoeconomic costs aims at establishing a monetary value to all material and energy flows, then providing a reasonable basis for price allocation. The analysis is applied to integral values of energy and a comparison of results between summer and winter season is performed. Results are analyzed on different time bases presenting energetic, exergetic, economic and exergoeconomic performance data. Results show that global exergy efficiency varies between 40% and 50% during the “Thermal Recovery Mode” operation and between 16% and 20% during the “Cooling mode” operation. It was also found that electricity, chilled water, cooling water and desalinated water exergoeconomic costs vary respectively in the ranges 0.1475–0.1722 €/kW h, 0.1863–0.1888 €/kW h ex , 0.01612–0.01702 €/kW h ex and 0.5695–0.6023 €/kW h ex .

  • a novel solar assisted heat pump driven by photovoltaic thermal collectors dynamic simulation and thermoeconomic optimization
    Energy, 2016
    Co-Authors: Francesco Calise, Rafal Damian Figaj, Massimo Dentice Daccadia, Laura Vanoli
    Abstract:

    This paper presents a dynamic simulation model and a thermo-economic analysis of a novel Polygeneration System based on a solar-assisted heat pump and an adsorption chiller, both driven by PVT (photovoltaic/thermal) collectors. The aim of this work is to design and dynamically simulate a novel ultra-high efficient solar heating and cooling System. The overall plant layout is designed to supply electricity, space heating and cooling and domestic hot water for a small residential building. The System combines solar cooling, solar-assisted heat pump and photovoltaic/thermal collector technologies in a novel solar Polygeneration System. In fact, the Polygeneration System is based on a PVT solar field, coupled with a water-to-water electric heat pump or to an adsorption chiller. PVT collectors simultaneously produce electricity and thermal energy. During the winter, hot water produced by PVT collectors primarily supplies the evaporator of the heat pump, whereas in summer, solar energy supplies an adsorption chiller providing the required space cooling. All year long, solar thermal energy in excess is converted into DHW (domestic hot water). The System model was developed in TRNSYS environment. 1-year dynamic simulations are performed for different case studies in various weather conditions. The results are analysed on different time bases presenting energetic, environmental and economic performance data. Finally, a sensitivity analysis and a thermoeconomic optimization were performed, in order to determine the set of System design/control parameters that minimize the simple pay-back period. The results showed a total energy efficiency of the PVT of 49%, a heat pump yearly coefficient of performance for heating mode above 4 and a coefficient of performance of the adsorption chiller of 0.55. Finally, it is also concluded that System performance is highly sensitive to the PVT field area. The System is profitable when a capital investment subsidy of 50% is considered.

Hongqiang Li - One of the best experts on this subject based on the ideXlab platform.

  • conventional and energy level based exergoeconomic analysis of biomass and natural gas fired Polygeneration System integrated with ground source heat pump and pem electrolyzer
    Energy Conversion and Management, 2019
    Co-Authors: Xiaofeng Zhang, Rong Zeng, Tao Du, Yecong He, Hong Tian, Kang Mu, Hongqiang Li
    Abstract:

    Abstract In this research, energy level based exergoeconomic evaluations are performed for a novel biomass and natural gas fired Polygeneration System of electricity, hot water, chilled water and hydrogen production. The proposed System mainly consists of a biomass gasifier, a proton exchange membrane (PEM) electrolyzer, a gas turbine cycle (GT), an absorption chiller, and a ground source heat pump cycle. Conventional and energy level based exergoeconomic performances of the proposed System are compared; related exergy and economic analysis are also performed. In addition, the variations in unit exergy cost of products (electricity, hot water, chilled water and hydrogen) are studied under economic factors. The results show that energy and exergy efficiency of the electrolyzer and the proposed System decrease with the increasing current density of the PEM electrolyzer. The unit exergy cost of electricity and hydrogen are 5.24 $/GJ and 20.41 $/GJ under the energy level based exergoeconomic method, respectively, which are higher than that under the conventional exergoeconomic method (electricity: 4.38 $/GJ, hydrogen: 19.00 $/GJ), while the unit exergy cost of hot water and chilled water under the energy level based exergoeconomic method are lower than that under the conventional exergoeconomic method. Moreover, the exergoeconomic factor and relative cost difference of the System equipment also show distinctions under the conventional and energy level based exergoeconomic methods. The presented Polygeneration System is a promising technology to utilize renewable energy and improve the flexibility of the integrated System; and the energy level based exergoeconomic method shows certain rationality and feasibility in the System analysis.

  • a Polygeneration System for the methanol production and the power generation with the solar biomass thermal gasification
    Energy Conversion and Management, 2015
    Co-Authors: Hongqiang Li
    Abstract:

    Abstract A Polygeneration System of generating methanol and power with the solar thermal gasification of the biomass is proposed in this work. The endothermic reactions of the biomass gasification are driven by the concentrated solar thermal energy in a range of 1000–1500 K. The syngas from the biomass gasification is used to produce the methanol via a synthesis reactor. The un-reacted gas is used for the power generation via a combined cycle power unit. The thermodynamic and economic performances of the Polygeneration System are investigated. A portion of the concentrated solar thermal energy can be chemically stored into the syngas, and thus the energy level of the solar thermal energy is improved. Numerical simulations are implemented to evaluate the thermal performances of the proposed Polygeneration System. The results indicate that H2/CO molar ratio of the syngas reaches 1.43–1.89, which satisfies the requirements of the methanol synthesis. The highest energy efficiency and the exergy efficiency of the Polygeneration System approximately are 56.09% and 54.86%, respectively. The proposed Polygeneration System can achieve the stable utilization of the solar energy and the mitigation of CO2 emission, and thus a promising approach is introduced for the efficient utilization of the abundant solar and biomass resources in the Western China.

  • A Polygeneration System for the methanol production and the power generation with the solar–biomass thermal gasification☆
    Energy Conversion and Management, 2015
    Co-Authors: Hongqiang Li
    Abstract:

    Abstract A Polygeneration System of generating methanol and power with the solar thermal gasification of the biomass is proposed in this work. The endothermic reactions of the biomass gasification are driven by the concentrated solar thermal energy in a range of 1000–1500 K. The syngas from the biomass gasification is used to produce the methanol via a synthesis reactor. The un-reacted gas is used for the power generation via a combined cycle power unit. The thermodynamic and economic performances of the Polygeneration System are investigated. A portion of the concentrated solar thermal energy can be chemically stored into the syngas, and thus the energy level of the solar thermal energy is improved. Numerical simulations are implemented to evaluate the thermal performances of the proposed Polygeneration System. The results indicate that H2/CO molar ratio of the syngas reaches 1.43–1.89, which satisfies the requirements of the methanol synthesis. The highest energy efficiency and the exergy efficiency of the Polygeneration System approximately are 56.09% and 54.86%, respectively. The proposed Polygeneration System can achieve the stable utilization of the solar energy and the mitigation of CO2 emission, and thus a promising approach is introduced for the efficient utilization of the abundant solar and biomass resources in the Western China.

  • performance analysis of a Polygeneration System for methanol production and power generation with solar biomass thermal gasification
    Energy Procedia, 2014
    Co-Authors: Hongqiang Li
    Abstract:

    Abstract By using the cotton stalk as the feedstock, a Polygeneration System for generating methanol and power with solar thermal gasification of biomass is proposed in this work. The endothermic reaction of biomass gasification is driven by the high temperature solar thermal energy with the range of 800∼1200°C. The flat-plate solar collector and the parabolic trough solar steam generator are used to preheat biomass and generate steam as gasification agent, respectively. The thermodynamic performance of the Polygeneration System is investigated. The compressed syngas, produced by the biomass gasification, is used to produce methanol via the synthesis reactor. The un-reacted gas is used for power generation through a combine cycle power unit. The results indicate that the methanol output rate and the output power in steady operation condition is 41.56 kg/s and 524.88 MW, respectively, and the maximum total exergy efficiency is 49.50% when the solar gasification temperature is 900°C. Furthermore, the highest exergy efficiency of the optimized scheme by recycling partial un-reacted syngas for methanol production reaches to 50.69%. The above studies provide a feasible way to exploit the abundant solar energy and biomass in the Western China.

  • analysis of a feasible Polygeneration System for power and methanol production taking natural gas and biomass as materials
    Applied Energy, 2010
    Co-Authors: Hongqiang Li, Hui Hong
    Abstract:

    Co-utilization of natural gas and biomass is a successful way to make efficient use of them for chemical production and power generation, for biomass is rich in carbon while natural gas is rich in hydrogen. The present paper therefore proposes a new Polygeneration System taking biomass and natural gas as materials for methanol production and power generation. The new Polygeneration System can achieve the optimal ratio of H2 to CO for methanol production by adjusting input ratio of natural gas to biomass without any energy penalty. Thus, the suggested System can eliminate CO to H2 shift process and CO2 remove process, which can avoid material and energy destruction; however, those processes are otherwise necessary in individual biomass to methanol plant. Moreover, the new System eliminates the CO2 addition process; however, the addition of CO2 is necessary in individual natural gas to methanol plant, which causes extra energy penalty. This System combined chemical production and power generation together, in order to achieve the cascaded utilization of chemical and physical energy of natural gas and biomass. In a further way, we investigated the key processes, to maximize the utilization of energy and improve System performance. A thermo-chemical process taking biomass and natural gas as co-feedstock is compared with the Systems that only taking either biomass or natural gas as resource for methanol production and power generation. The evaluation and calculation of the Systems are carried out by help of Aspen Plus process simulator. The evaluation results indicate that, the new Polygeneration System can reduce materials input at least 9% compared with individual Systems with same output. In a further way, the effect of natural gas to biomass feed ratio on System performance is also investigated. The research results show that, the proposed Polygeneration System would be expected to realize efficient utilization of biomass and natural gas, and offer a possibility of developing new technologies for biomass and natural gas based Systems.

Massimo Dentice Daccadia - One of the best experts on this subject based on the ideXlab platform.

  • exergetic and exergoeconomic analysis of a novel hybrid solar geothermal Polygeneration System producing energy and water
    Energy Conversion and Management, 2016
    Co-Authors: Francesco Calise, Massimo Dentice Daccadia, Adriano Macaluso, Antonio Piacentino, Laura Vanoli
    Abstract:

    Abstract A dynamic simulation model of a novel solar–geothermal Polygeneration System and the related exergetic and exergoeconomic analyses are presented in this paper. The plant is designed in order to supply electrical, thermal and cooling energy and fresh water for a small community, connected to a district heating and cooling network. The hybrid System is equipped with an Organic Rankine Cycle fueled by medium-enthalpy geothermal energy and by a Parabolic Trough Collector solar field. Geothermal brine is also used for space heating and cooling purposes. Finally, geothermal fluid supplies heat to a Multi-Effect Distillation unit, producing also desalinized water from seawater. Dynamic simulations were performed in order to design the System. The overall simulation model, implemented in TRNSYS environment, includes detailed algorithms for the simulation of System components. Detailed control strategies were included in the model in order to properly manage the System. An exergetic and exergoeconomic analysis is also implemented. The exergetic analysis allows to identify all the aspects that affect the global exergy efficiency, in order to suggest possible System enhancements. The accounting of exergoeconomic costs aims at establishing a monetary value to all material and energy flows, then providing a reasonable basis for price allocation. The analysis is applied to integral values of energy and a comparison of results between summer and winter season is performed. Results are analyzed on different time bases presenting energetic, exergetic, economic and exergoeconomic performance data. Results show that global exergy efficiency varies between 40% and 50% during the “Thermal Recovery Mode” operation and between 16% and 20% during the “Cooling mode” operation. It was also found that electricity, chilled water, cooling water and desalinated water exergoeconomic costs vary respectively in the ranges 0.1475–0.1722 €/kW h, 0.1863–0.1888 €/kW h ex , 0.01612–0.01702 €/kW h ex and 0.5695–0.6023 €/kW h ex .

  • a novel solar assisted heat pump driven by photovoltaic thermal collectors dynamic simulation and thermoeconomic optimization
    Energy, 2016
    Co-Authors: Francesco Calise, Rafal Damian Figaj, Massimo Dentice Daccadia, Laura Vanoli
    Abstract:

    This paper presents a dynamic simulation model and a thermo-economic analysis of a novel Polygeneration System based on a solar-assisted heat pump and an adsorption chiller, both driven by PVT (photovoltaic/thermal) collectors. The aim of this work is to design and dynamically simulate a novel ultra-high efficient solar heating and cooling System. The overall plant layout is designed to supply electricity, space heating and cooling and domestic hot water for a small residential building. The System combines solar cooling, solar-assisted heat pump and photovoltaic/thermal collector technologies in a novel solar Polygeneration System. In fact, the Polygeneration System is based on a PVT solar field, coupled with a water-to-water electric heat pump or to an adsorption chiller. PVT collectors simultaneously produce electricity and thermal energy. During the winter, hot water produced by PVT collectors primarily supplies the evaporator of the heat pump, whereas in summer, solar energy supplies an adsorption chiller providing the required space cooling. All year long, solar thermal energy in excess is converted into DHW (domestic hot water). The System model was developed in TRNSYS environment. 1-year dynamic simulations are performed for different case studies in various weather conditions. The results are analysed on different time bases presenting energetic, environmental and economic performance data. Finally, a sensitivity analysis and a thermoeconomic optimization were performed, in order to determine the set of System design/control parameters that minimize the simple pay-back period. The results showed a total energy efficiency of the PVT of 49%, a heat pump yearly coefficient of performance for heating mode above 4 and a coefficient of performance of the adsorption chiller of 0.55. Finally, it is also concluded that System performance is highly sensitive to the PVT field area. The System is profitable when a capital investment subsidy of 50% is considered.

  • thermoeconomic optimization of a renewable Polygeneration System serving a small isolated community
    Energies, 2015
    Co-Authors: Francesco Calise, Massimo Dentice Daccadia, Antonio Piacentino, Maria Vicidomini
    Abstract:

    During the last years, special attention has been paid to renewable Polygeneration technologies, able of simultaneously producing thermal, cooling, electrical energy and desalinated water from seawater. This paper focuses on an innovative Polygeneration System driven by renewable energy sources, including the following technologies: hybrid photovoltaic/thermal collectors, concentrating parabolic trough (CPVT), a biomass heater, a single-stage absorption chiller and a multiple-effect distillation desalination System. The System is designed to cover the base load of an isolated small community. In previous papers, the dynamic simulation model about plant operation is discussed. In this paper, a detailed exergy, economic and environmental analysis of the plant is presented. In addition, the plant was optimized using different objective functions, applying the Design of Experiment (DoE) methodology which evaluates the sensitivity of the different objective functions with respect to the selected design parameters. The results show that an increase of the storage volume is generally negative, whereas increasing the solar field area involves an increase of the exergy destruction rate, but also an improvement of the CPVT exergy output provided; the final result is an increase of both the exergy efficiency and the economic profitability of the Polygeneration System.

  • a novel renewable Polygeneration System for a small mediterranean volcanic island for the combined production of energy and water dynamic simulation and economic assessment
    Applied Energy, 2014
    Co-Authors: Francesco Calise, Massimo Dentice Daccadia, Andrea Cipollina, Antonio Piacentino
    Abstract:

    This paper investigates the integration of solar and geothermal energy in a novel Polygeneration System producing simultaneously: electricity, thermal energy, cooling energy and fresh water. The Polygeneration System under analysis includes concentrating photovoltaic/thermal solar collectors (CPVT), a Geothermal Well (GW) a multi-effect distillation (MED) System for seawater desalination, a single-stage LiBr–H2O absorption chiller and additional components, such as: storage tanks, heat exchangers and balance of plant devices. The CPVT produces simultaneously electrical energy and thermal energy, at a maximum temperature of about 100°C. The electrical energy is delivered to the grid, whereas the thermal energy can be used for different scopes. First, the thermal energy can be used for heating purposes and/or Domestic Hot Water production. As an alternative, solar thermal energy can be used to drive an absorption chiller, producing chilled water for space cooling. Finally, solar energy, in combination with the thermal energy produced by low-enthalpy (about 80°C) geothermal wells, may be used by the MED System to convert seawater into desalinated water. Geothermal energy is also used to produce Domestic Hot Water at 45°C. The System is dynamically simulated by means of a zero-dimensional transient simulation model. The simulation model also includes detailed control strategies, for the management of the different technologies included in such a complex System. The System is assumed to be operated in some of the several small volcanic islands in the Mediterranean Sea, assuming Pantelleria (Trapani, Italy) as main case study. Here, the availability of solar and geothermal energy is high whereas the availability of fresh water is scarce and its cost consequently high. Results show an excellent energetic performance of the System under investigation. From the economic point of view, the profitability of the System dramatically increases when user Domestic Hot Water demand is high.

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  • a novel hybrid Polygeneration System supplying energy and desalinated water by renewable sources in pantelleria island
    Energy, 2017
    Co-Authors: Francesco Calise, Adriano Macaluso, Antonio Piacentino, Laura Vanoli
    Abstract:

    In this paper a thermoeconomic analysis of a novel hybrid Renewable Polygeneration System connected to a district heating and cooling network is presented. The plant is powered simultaneously by solar and geothermal sources, producing electricity, desalinated water, heat and cooling energy. System layout includes Parabolic Through Collector (PTC) field, geothermal wells, Organic Rankine Cycle (ORC) unit and a Multi-Effect Desalination (MED) System. Cooling and thermal demands are calculated by suitable building dynamic simulation models, calibrated for Pantelleria Island. Electrical demand is obtained by measured data. A detailed control strategy has been implemented in order to prevent any heat dissipation, to match the appropriate operating temperature levels in each component, to avoid a too low temperature of geothermal fluid reinjected in the wells and to manage the priority of space heating and cooling process. A 1-year dynamic simulation has been performed and results analyzed on daily, monthly and yearly basis. The System achieved an SPB equal to 8.50 and it resulted capable to cover the energy demands of a small community. Moreover, the plant is capable to cover the fresh water demand of the Pantelleria Island.

  • exergetic and exergoeconomic analysis of a novel hybrid solar geothermal Polygeneration System producing energy and water
    Energy Conversion and Management, 2016
    Co-Authors: Francesco Calise, Massimo Dentice Daccadia, Adriano Macaluso, Antonio Piacentino, Laura Vanoli
    Abstract:

    Abstract A dynamic simulation model of a novel solar–geothermal Polygeneration System and the related exergetic and exergoeconomic analyses are presented in this paper. The plant is designed in order to supply electrical, thermal and cooling energy and fresh water for a small community, connected to a district heating and cooling network. The hybrid System is equipped with an Organic Rankine Cycle fueled by medium-enthalpy geothermal energy and by a Parabolic Trough Collector solar field. Geothermal brine is also used for space heating and cooling purposes. Finally, geothermal fluid supplies heat to a Multi-Effect Distillation unit, producing also desalinized water from seawater. Dynamic simulations were performed in order to design the System. The overall simulation model, implemented in TRNSYS environment, includes detailed algorithms for the simulation of System components. Detailed control strategies were included in the model in order to properly manage the System. An exergetic and exergoeconomic analysis is also implemented. The exergetic analysis allows to identify all the aspects that affect the global exergy efficiency, in order to suggest possible System enhancements. The accounting of exergoeconomic costs aims at establishing a monetary value to all material and energy flows, then providing a reasonable basis for price allocation. The analysis is applied to integral values of energy and a comparison of results between summer and winter season is performed. Results are analyzed on different time bases presenting energetic, exergetic, economic and exergoeconomic performance data. Results show that global exergy efficiency varies between 40% and 50% during the “Thermal Recovery Mode” operation and between 16% and 20% during the “Cooling mode” operation. It was also found that electricity, chilled water, cooling water and desalinated water exergoeconomic costs vary respectively in the ranges 0.1475–0.1722 €/kW h, 0.1863–0.1888 €/kW h ex , 0.01612–0.01702 €/kW h ex and 0.5695–0.6023 €/kW h ex .

  • exergetic and exergoeconomic analysis of a renewable Polygeneration System and viability study for small isolated communities
    Energy, 2015
    Co-Authors: Francesco Calise, Dentice M Daccadia, Antonio Piacentino
    Abstract:

    A great interest has recently arisen for the sustainable supply of energy and fresh water, due to the growing demand from developing countries. Facing this demand by traditional technologies implies evident risks related with the high cost of fossil fuels and their environmental impact. Then, alternative solutions based on the use of renewable sources and innovative technologies must be considered. In this paper a renewable Polygeneration System is examined, which includes a solar field based on parabolic trough photovoltaic/thermal collectors, a biomass heater, an absorption chiller and a Multiple Effect Distillation desalination unit.

  • thermoeconomic optimization of a renewable Polygeneration System serving a small isolated community
    Energies, 2015
    Co-Authors: Francesco Calise, Massimo Dentice Daccadia, Antonio Piacentino, Maria Vicidomini
    Abstract:

    During the last years, special attention has been paid to renewable Polygeneration technologies, able of simultaneously producing thermal, cooling, electrical energy and desalinated water from seawater. This paper focuses on an innovative Polygeneration System driven by renewable energy sources, including the following technologies: hybrid photovoltaic/thermal collectors, concentrating parabolic trough (CPVT), a biomass heater, a single-stage absorption chiller and a multiple-effect distillation desalination System. The System is designed to cover the base load of an isolated small community. In previous papers, the dynamic simulation model about plant operation is discussed. In this paper, a detailed exergy, economic and environmental analysis of the plant is presented. In addition, the plant was optimized using different objective functions, applying the Design of Experiment (DoE) methodology which evaluates the sensitivity of the different objective functions with respect to the selected design parameters. The results show that an increase of the storage volume is generally negative, whereas increasing the solar field area involves an increase of the exergy destruction rate, but also an improvement of the CPVT exergy output provided; the final result is an increase of both the exergy efficiency and the economic profitability of the Polygeneration System.

  • a novel renewable Polygeneration System for a small mediterranean volcanic island for the combined production of energy and water dynamic simulation and economic assessment
    Applied Energy, 2014
    Co-Authors: Francesco Calise, Massimo Dentice Daccadia, Andrea Cipollina, Antonio Piacentino
    Abstract:

    This paper investigates the integration of solar and geothermal energy in a novel Polygeneration System producing simultaneously: electricity, thermal energy, cooling energy and fresh water. The Polygeneration System under analysis includes concentrating photovoltaic/thermal solar collectors (CPVT), a Geothermal Well (GW) a multi-effect distillation (MED) System for seawater desalination, a single-stage LiBr–H2O absorption chiller and additional components, such as: storage tanks, heat exchangers and balance of plant devices. The CPVT produces simultaneously electrical energy and thermal energy, at a maximum temperature of about 100°C. The electrical energy is delivered to the grid, whereas the thermal energy can be used for different scopes. First, the thermal energy can be used for heating purposes and/or Domestic Hot Water production. As an alternative, solar thermal energy can be used to drive an absorption chiller, producing chilled water for space cooling. Finally, solar energy, in combination with the thermal energy produced by low-enthalpy (about 80°C) geothermal wells, may be used by the MED System to convert seawater into desalinated water. Geothermal energy is also used to produce Domestic Hot Water at 45°C. The System is dynamically simulated by means of a zero-dimensional transient simulation model. The simulation model also includes detailed control strategies, for the management of the different technologies included in such a complex System. The System is assumed to be operated in some of the several small volcanic islands in the Mediterranean Sea, assuming Pantelleria (Trapani, Italy) as main case study. Here, the availability of solar and geothermal energy is high whereas the availability of fresh water is scarce and its cost consequently high. Results show an excellent energetic performance of the System under investigation. From the economic point of view, the profitability of the System dramatically increases when user Domestic Hot Water demand is high.