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This article presents the results of the optimization of steam generator control systems powered by mixtures of liquid fuels containing biofuels. The numerical model was based on the results of experimental research of steam generator operation in an open system. The numerical model is used to build control algorithms that improve performance, increase efficiency, reduce fuel consumption and increase safety in the full range of operation of the steam generator and the cogeneration system of which it is a component. In this research, the following parameters were monitored: temperature and pressure of the circulating medium, exhaust gas temperature, oxygen content in exhaust gas, percentage control of oil burner power. Two methods of controlling the steam generator were proposed: the classic one, using the PID regulator, and the advanced one, using artificial neural networks. The work shows how the model is adapted to the real system and the impact of the control algorithms on the efficiency of the combustion process. The example is considered for the implementation of advanced control systems in micro-, small- and medium-power cogeneration and trigeneration systems in order to improve their final efficiency and increase the profitability of implementation.
Krzysztof Lalik; Mateusz Kozek; Szymon Podlasek; Rafał Figaj; Paweł Gut. Q-Learning Neural Controller for Steam Generator Station in Micro Cogeneration Systems. Energies 2021, 14, 5334 .
AMA StyleKrzysztof Lalik, Mateusz Kozek, Szymon Podlasek, Rafał Figaj, Paweł Gut. Q-Learning Neural Controller for Steam Generator Station in Micro Cogeneration Systems. Energies. 2021; 14 (17):5334.
Chicago/Turabian StyleKrzysztof Lalik; Mateusz Kozek; Szymon Podlasek; Rafał Figaj; Paweł Gut. 2021. "Q-Learning Neural Controller for Steam Generator Station in Micro Cogeneration Systems." Energies 14, no. 17: 5334.
Systems involving more than one energy source, namely hybrid systems, can be arranged in different configurations and layouts depending on the available or used energy source, application and scale of the system. Despite an increasing awareness and penetration of renewable energy sources at different scales in many countries over the world, the adoption of hybrid and novel renewable systems is relatively scarce, especially at a small scale. This scenario is also presented from the point of view of the research of such systems. Therefore, the scope of the paper is to improve the knowledge regarding small-scale hybrid renewable energy systems performance and operation by investigating a novel trigeneration system based on a biomass fired steam cycle, wind turbine, photovoltaic panels and adsorption chiller. In the proposed system, the thermal energy recovered by the steam cycle is used to match the user thermal demand by means of a storage tank supplying directly heat to the user during winter, and driving the adsorption unit during summer. The electrical energy produced by the steam turbine, photovoltaic field and wind turbine is managed by a control system that integrates a bidirectional connection with the electric grid. The grid allows one to virtually store the electrical energy produced in excess and to recover it in part when needed by the user. In order to assess the system performance, a farm and residential buildings are considered as case study. The proposed system is modelled and dynamically simulated by means of Transient System Simulation software. In the paper, the dynamic operation of the system and the energy and economic performance of the system is assessed. The operation of the system is presented in a daily and monthly basis, while the global performance parameters of the system are reported considering a one-year period. The primary energy saving of the system is above 70% when a reference system based on natural gas, electric chiller and grid is considered. For this scenario, the Simple Pay Back of about 10 years is achieved. The results of the analysis show that the system is feasible from the technical and energy point of view, whereas its economic profitability is significantly affected by its cost and the reference system that is adopted by the user.
Rafał Figaj. Performance assessment of a renewable micro-scale trigeneration system based on biomass steam cycle, wind turbine, photovoltaic field. Renewable Energy 2021, 177, 193 -208.
AMA StyleRafał Figaj. Performance assessment of a renewable micro-scale trigeneration system based on biomass steam cycle, wind turbine, photovoltaic field. Renewable Energy. 2021; 177 ():193-208.
Chicago/Turabian StyleRafał Figaj. 2021. "Performance assessment of a renewable micro-scale trigeneration system based on biomass steam cycle, wind turbine, photovoltaic field." Renewable Energy 177, no. : 193-208.
The paper presents an experimental investigation of a solar dish concentrating system with thermal collectors, along with a numerical investigation of a solar cooling installation based on such system by means of dynamic simulation. The main aim of this study is the analysis of heat generation from the system for heating and cooling purposes, with the use of sorption chillers. A computer simulation of the dynamic operation of the proposed solar heating and cooling system was developed within TRNSYS software. The experimental data were used to validate the model of the concentrator and solar collectors. Successively, a solar heating and cooling installation for a residential application, integrating the different configurations of solar energy collecting devices and thermally driven chillers, was proposed and dynamically simulated. Flat-plate, evacuated tube and photovoltaic-thermal collectors were considered along with absorption and adsorption chiller units. In the present study, different system configurations, localities and time bases were considered to investigate the energy and economic performance of the system. The model of the solar dish and collector arrangement overestimates the produced energy by less than 5% as compared to the experimental study. The results show that the space cooling demand is matched in 23.6 and 46.2% by solar energy in Warsaw, while in Lisbon from 38.2 to 46.1%. The simple payback period of the investigated system configuration was for Warsaw between 18.1 years for the combination of flat-plate collector and absorption chiller and 27.2 year for the photovoltaic-thermal collector with adsorption chiller.
Rafał Figaj; Maciej Żołądek. Experimental and numerical analysis of hybrid solar heating and cooling system for a residential user. Renewable Energy 2021, 172, 955 -967.
AMA StyleRafał Figaj, Maciej Żołądek. Experimental and numerical analysis of hybrid solar heating and cooling system for a residential user. Renewable Energy. 2021; 172 ():955-967.
Chicago/Turabian StyleRafał Figaj; Maciej Żołądek. 2021. "Experimental and numerical analysis of hybrid solar heating and cooling system for a residential user." Renewable Energy 172, no. : 955-967.
Energy needs of air conditioning systems are constantly growing worldwide, due to climate change and growing standards of buildings. Among the possible systems, solar heating and cooling based on reversible heat pumps and thermally driven chillers are a viable option for ensuring space heating and cooling for different users. The high installation costs are a limit to their diffusion, however, under specific circumstances (climate, type of the building, type of the user, etc.), the investment in this technology can be profitable in a long term. The presented paper describes an energy-economic assessment of a solar heating and cooling system integrating a solar dish concentrator with thermal collectors coupled with a reversible heat pump and an absorption or adsorption chiller. The system integrated with a household building is developed and dynamically simulated in the Transient System Simulation (TRNSYS) environment under different circumstances –adoption of absorption or adsorption chiller, use of auxiliary thermal energy to drive the sorption chillers, and locality. The results show that space cooling demand in Cracow is matched by solar energy, in a range between 49.0 and 97.6%, while for Naples the space cooling demand is provided by solar heat from 46.1 to 99.1% depending on the adopted sorption chiller and or the use of auxiliary heat for a natural gas boiler. The proposed system is not profitable in case Cracow, since a Simple Pay Back period of about 20 years is achieved. Conversely, case of Naples, the same index achieves a value between 8 and 12 years showing that the proposed system may be a viable solution for heating and cooling installation.
Rafał Figaj; Maciej Żołądek. Operation and Performance Assessment of a Hybrid Solar Heating and Cooling System for Different Configurations and Climatic Conditions. Energies 2021, 14, 1142 .
AMA StyleRafał Figaj, Maciej Żołądek. Operation and Performance Assessment of a Hybrid Solar Heating and Cooling System for Different Configurations and Climatic Conditions. Energies. 2021; 14 (4):1142.
Chicago/Turabian StyleRafał Figaj; Maciej Żołądek. 2021. "Operation and Performance Assessment of a Hybrid Solar Heating and Cooling System for Different Configurations and Climatic Conditions." Energies 14, no. 4: 1142.
Renewable energy sources, such as solar, wind, biomass, and geothermal energy, are being more and more adopted in small and micro-scale distributed generation systems. In this context, different hybrid configurations and layouts that may adopt, lead to different energy and economic performance of energy generation systems. In micro-scale applications, biomass and solar energy sources are more frequently investigated in literature compared to other combinations as biomass and wind energy. The analysis of the performance of a novel small-scale trigeneration system is presented in this paper. The system includes biomass boiler, water steam turbine, absorption chiller, and wind turbine, and it is linked to the electric grid by means of a bidirectional connection, allowing to the store virtually the electrical energy produced in excess, and use when needed. For the proposed system, a zootechnical farm and a residential building are considered as case study, including different scenarios for the reference energy system. The Transient System Simulation (TRNSYS software is used to model, simulate, and investigate the system performance under realistic operation conditions. Energy and economic performance of the system is assessed by means of a daily, weekly, and yearly analysis. The effect of the main design parameters, as steam and wind turbine power on the system performance, is investigated by means of a sensitivity analysis. The investigations show that the Simple Pay Back time of the proposed system is below 6 years, when the biomass is free, capacities of steam and wind turbines lower than 4 kW are selected, and a reference system with a natural gas boiler and electrical grid is considered. The system allows one to achieve satisfactory energy and economic performance under the considered conditions, when a proper design of the system component capacities is adopted.
Rafał Figaj; Krzysztof Sornek; Szymon Podlasek; Maciej Żołądek. Operation and Sensitivity Analysis of a Micro-Scale Hybrid Trigeneration System Integrating a Water Steam Cycle and Wind Turbine under Different Reference Scenarios. Energies 2020, 13, 5697 .
AMA StyleRafał Figaj, Krzysztof Sornek, Szymon Podlasek, Maciej Żołądek. Operation and Sensitivity Analysis of a Micro-Scale Hybrid Trigeneration System Integrating a Water Steam Cycle and Wind Turbine under Different Reference Scenarios. Energies. 2020; 13 (21):5697.
Chicago/Turabian StyleRafał Figaj; Krzysztof Sornek; Szymon Podlasek; Maciej Żołądek. 2020. "Operation and Sensitivity Analysis of a Micro-Scale Hybrid Trigeneration System Integrating a Water Steam Cycle and Wind Turbine under Different Reference Scenarios." Energies 13, no. 21: 5697.
The adoption of micro-scale renewable energy systems in the residential sector has started to be increasingly diffused in recent years. Among the possible systems, ground heat exchangers coupled with reversible heat pumps are an interesting solution for providing space heating and cooling to households. In this context, a possible hybridization of this technology with other renewable sources may lead to significant benefits in terms of energy performance and reduction of the dependency on conventional energy sources. However, the investigation of hybrid systems is not frequently addressed in the literature. The present paper presents a technical, energy, and economic analysis of a hybrid ground-solar-wind system, proving space heating/cooling, domestic hot water, and electrical energy for a household. The system includes vertical ground heat exchangers, a water–water reversible heat pump, photovoltaic/thermal collectors, and a wind turbine. The system with the building is modeled and dynamically simulated in the Transient System Simulation (TRNSYS) software. Daily dynamic operation of the system and the monthly and yearly results are analyzed. In addition, a parametric analysis is performed varying the solar field area and wind turbine power. The yearly results point out that the hybrid system, compared to a conventional system with natural gas boiler and electrical chiller, allows one to reduce the consumption of primary energy of 66.6%, and the production of electrical energy matches 68.6% of the user demand on a yearly basis. On the other hand, the economic results show that that system is not competitive with the conventional solution, because the simple pay back period is 21.6 years, due to the cost of the system components.
Rafał Figaj; Maciej Żołądek; Wojciech Goryl. Dynamic Simulation and Energy Economic Analysis of a Household Hybrid Ground-Solar-Wind System Using TRNSYS Software. Energies 2020, 13, 3523 .
AMA StyleRafał Figaj, Maciej Żołądek, Wojciech Goryl. Dynamic Simulation and Energy Economic Analysis of a Household Hybrid Ground-Solar-Wind System Using TRNSYS Software. Energies. 2020; 13 (14):3523.
Chicago/Turabian StyleRafał Figaj; Maciej Żołądek; Wojciech Goryl. 2020. "Dynamic Simulation and Energy Economic Analysis of a Household Hybrid Ground-Solar-Wind System Using TRNSYS Software." Energies 13, no. 14: 3523.
Solar cooling systems based on absorption chillers may be considered as an alternative approach to compressor systems supplied by electric power. This article presents the results of experiments conducted with a hybrid solar system integrating a concentrator, and computer simulations of a hybrid solar cooling system incorporating flat plate collectors and a concentrator. The hybrid solar cooling system was fully based on solar energy and no auxiliary system was considered. Experiential validation of the concentrator model was performed and a transient model of the installation was developed. The model of the concentrator was developed using an analytic method. The dynamic simulation of the entire system model was performed using TRNSYS software. The system was investigated for a small-scale user, consisting of a single-floor residential house. Different time bases (day, week year), concentrator and flat plate collector areas, climatic conditions and energy tariffs were considered to investigate the energy and economic performance of the system. The main results are the following: concentrator efficiency of 70%, Primary Energy Saving of 50%, optimal concentrator area per absorption chiller capacity of 1.6 m2/kW and Simple Pay Back between 8 and 23 years.
Rafał Figaj; Mateusz Szubel; Estera Przenzak; Mariusz Filipowicz. Feasibility of a small-scale hybrid dish/flat-plate solar collector system as a heat source for an absorption cooling unit. Applied Thermal Engineering 2019, 163, 114399 .
AMA StyleRafał Figaj, Mateusz Szubel, Estera Przenzak, Mariusz Filipowicz. Feasibility of a small-scale hybrid dish/flat-plate solar collector system as a heat source for an absorption cooling unit. Applied Thermal Engineering. 2019; 163 ():114399.
Chicago/Turabian StyleRafał Figaj; Mateusz Szubel; Estera Przenzak; Mariusz Filipowicz. 2019. "Feasibility of a small-scale hybrid dish/flat-plate solar collector system as a heat source for an absorption cooling unit." Applied Thermal Engineering 163, no. : 114399.
F Calise; R D Figaj; L Vanoli. Energy performance of a low-cost PhotoVoltaic/Thermal (PVT) collector with and without thermal insulation. IOP Conference Series: Earth and Environmental Science 2019, 214, 1 .
AMA StyleF Calise, R D Figaj, L Vanoli. Energy performance of a low-cost PhotoVoltaic/Thermal (PVT) collector with and without thermal insulation. IOP Conference Series: Earth and Environmental Science. 2019; 214 ():1.
Chicago/Turabian StyleF Calise; R D Figaj; L Vanoli. 2019. "Energy performance of a low-cost PhotoVoltaic/Thermal (PVT) collector with and without thermal insulation." IOP Conference Series: Earth and Environmental Science 214, no. : 1.
In this paper a model for the dynamic simulation and the optimization of a novel solar polygeneration system is presented. The system is based on a flat-plate photovoltaic/thermal collector solar field, coupled with water-to-water electric heat pump/chiller, adsorption chiller and electrical energy storage technologies. The system is modelled to supply space heating or cooling, domestic hot water and electrical energy. The produced electrical energy is self-consumed by both user and system auxiliary equipment, stored and/or supplied to the grid. For the simulation purpose, a detailed building model and a comprehensive electrical energy model, taking into account the electrical energy storage and exchange with the grid, are implemented. This paper is a further development of a recent work previously presented by the authors, where measured electrical demands of real users are used in the simulation and a comprehensive energy-economic analysis is performed. The present paper deals with a comprehensive sensitivity analysis and an optimization of the polygenerative system under investigation. In particular, energy and economic objective functions are used and the optimal set of design parameters are calculated, using the computer-based Design of Experiment procedure and the Generalized Search Method. The main effects plots and contour plots are discussed for the selected objective functions, while the optimum values of selected parameters, obtained with both optimization methods, are compared.
F Calise; Rafal Damian Figaj; L Vanoli. Optimization of a novel polygeneration system integrating photovoltaic/thermal collectors, solar assisted heat pump, adsorption chiller and electrical energy storage. IOP Conference Series: Earth and Environmental Science 2019, 214, 012115 .
AMA StyleF Calise, Rafal Damian Figaj, L Vanoli. Optimization of a novel polygeneration system integrating photovoltaic/thermal collectors, solar assisted heat pump, adsorption chiller and electrical energy storage. IOP Conference Series: Earth and Environmental Science. 2019; 214 (1):012115.
Chicago/Turabian StyleF Calise; Rafal Damian Figaj; L Vanoli. 2019. "Optimization of a novel polygeneration system integrating photovoltaic/thermal collectors, solar assisted heat pump, adsorption chiller and electrical energy storage." IOP Conference Series: Earth and Environmental Science 214, no. 1: 012115.
Nowadays, photovoltaic systems installed in urban areas may be essential for distributed generation and lead to increase energy security and improve economy of building exploitation. Unfortunately, in many cases their operation in urban area is not so efficient. It is connected with shadowing by neighbouring buildings, trees or by the HVAC systems installed on roofs (including such elements as fans, compressors, etc). Moreover, HVAC systems often occupy "the best" place on roofs. Level of shadowing varies during a day, and a year, significantly influencing on the power generation from PV installations. It caused serious difficulties in designing such installations (e.g. choosing position, orientation, number of modules etc.). In the paper a PV efficiency analysis was performed for the case of photovoltaic installation located on the roof of didactic building in Krakow centre. The projected power of the installation was 8.48 kWp (total nominal power of panels), and 7.5 kWp at the output of the inverters used for own building demand and car load station. The available area for PV system was strongly limited and achieving of the optimal tilting angle was impossible. Presented simulations have been conducted using two commercially available software: TRNSYS and Polysun. Results of the simulations were used for improving operation parameters of the installation. A three approaches was considered: avoiding the shadow, tilting angle optimization and redirecting of additional light stream.
Maciej Żołądek; M Filipowicz; K Sornek; R D Figaj. Energy performance of the photovoltaic system in urban area - case study. IOP Conference Series: Earth and Environmental Science 2019, 214, 012123 .
AMA StyleMaciej Żołądek, M Filipowicz, K Sornek, R D Figaj. Energy performance of the photovoltaic system in urban area - case study. IOP Conference Series: Earth and Environmental Science. 2019; 214 (1):012123.
Chicago/Turabian StyleMaciej Żołądek; M Filipowicz; K Sornek; R D Figaj. 2019. "Energy performance of the photovoltaic system in urban area - case study." IOP Conference Series: Earth and Environmental Science 214, no. 1: 012123.
Simona Di Fraia; Rafal Damian Figaj; Nicola Massarotti; Laura Vanoli. An integrated system for sewage sludge drying through solar energy and a combined heat and power unit fuelled by biogas. Energy Conversion and Management 2018, 171, 587 -603.
AMA StyleSimona Di Fraia, Rafal Damian Figaj, Nicola Massarotti, Laura Vanoli. An integrated system for sewage sludge drying through solar energy and a combined heat and power unit fuelled by biogas. Energy Conversion and Management. 2018; 171 ():587-603.
Chicago/Turabian StyleSimona Di Fraia; Rafal Damian Figaj; Nicola Massarotti; Laura Vanoli. 2018. "An integrated system for sewage sludge drying through solar energy and a combined heat and power unit fuelled by biogas." Energy Conversion and Management 171, no. : 587-603.
Sport centres thermal demand is extremely high due to the large amount of sanitary hot water production. Therefore, energy savings actions must be performed in order to optimize system efficiency. In this framework, the present paper investigates the possibility to perform an energy rehabilitation of an indoor swimming pool centre by means of solar thermal collectors and heat pump technologies integrated with the existing plant. The case study consists of a university indoor swimming pool centre located in Naples, South of Italy. A dynamic simulation model is developed by TRNSYS software (Thermal Energy System Specialists, LLC, Madison, WI, USA). An experimental investigation is also performed in order to calibrate the swimming pool thermal model and the space conditioning equipment operation. Real data concerning the thermal demand of the centre are implemented and the dynamic behaviour of the swimming pool occupants is also considered. The proposed technical solutions are analysed from an energy and economic point of view. A parametric analysis aiming at determining the effect of the size of the solar field on the system performance is performed. The comparison outlines that the best energy and economic performance is achieved by evacuated solar thermal collectors. In particular, the Simple Pay Back (SPB) period results about 14 years without incentives and it decreases to 5 years considering the Italian incentive policy. For an evacuated collector field of 150 m2, the SPB without incentive results below 9 years.
Francesco Calise; Rafal Damian Figaj; Laura Vanoli. Energy and Economic Analysis of Energy Savings Measures in a Swimming Pool Centre by Means of Dynamic Simulations. Energies 2018, 11, 2182 .
AMA StyleFrancesco Calise, Rafal Damian Figaj, Laura Vanoli. Energy and Economic Analysis of Energy Savings Measures in a Swimming Pool Centre by Means of Dynamic Simulations. Energies. 2018; 11 (9):2182.
Chicago/Turabian StyleFrancesco Calise; Rafal Damian Figaj; Laura Vanoli. 2018. "Energy and Economic Analysis of Energy Savings Measures in a Swimming Pool Centre by Means of Dynamic Simulations." Energies 11, no. 9: 2182.
In this paper, a one-dimensional finite-volume model of a low-cost unglazed flat-plate PhotoVoltaic/Thermal (PVT) solar collector is presented. Mass, energy and exergy balances are performed for each element of the computational domain, discretised along the flow direction. Experimental and numerical data are compared. Exergy destruction rate and exergetic efficiency are evaluated for each element of the computational domain. In addition, the effect of the main design/operation parameters on the collector exergetic performance is also investigated. The comparison between experimental and numerical data in terms of PVT outlet temperature shows an absolute error and a standard deviation of -1.06°C and 0.628°C, respectively. The calculated exergetic efficiency varies between 0.134 and 0.165 during the experimental measurements. For lower flow rates, the relationship between the total exergetic residual and inlet temperature is almost linear.
Francesco Calise; Rafal Damian Figaj; Laura Vanoli. One-dimensional exergy analysis of an unglazed low-cost PhotoVoltaic/Thermal solar collector. International Journal of Exergy 2018, 26, 107 .
AMA StyleFrancesco Calise, Rafal Damian Figaj, Laura Vanoli. One-dimensional exergy analysis of an unglazed low-cost PhotoVoltaic/Thermal solar collector. International Journal of Exergy. 2018; 26 (1/2):107.
Chicago/Turabian StyleFrancesco Calise; Rafal Damian Figaj; Laura Vanoli. 2018. "One-dimensional exergy analysis of an unglazed low-cost PhotoVoltaic/Thermal solar collector." International Journal of Exergy 26, no. 1/2: 107.
Alberto Carotenuto; Rafal Damian Figaj; Laura Vanoli. A novel solar-geothermal district heating, cooling and domestic hot water system: Dynamic simulation and energy-economic analysis. Energy 2017, 141, 2652 -2669.
AMA StyleAlberto Carotenuto, Rafal Damian Figaj, Laura Vanoli. A novel solar-geothermal district heating, cooling and domestic hot water system: Dynamic simulation and energy-economic analysis. Energy. 2017; 141 ():2652-2669.
Chicago/Turabian StyleAlberto Carotenuto; Rafal Damian Figaj; Laura Vanoli. 2017. "A novel solar-geothermal district heating, cooling and domestic hot water system: Dynamic simulation and energy-economic analysis." Energy 141, no. : 2652-2669.
Francesco Calise; Rafal Damian Figaj; Laura Vanoli. 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, 149, 798 -814.
AMA StyleFrancesco Calise, Rafal Damian Figaj, Laura Vanoli. 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; 149 ():798-814.
Chicago/Turabian StyleFrancesco Calise; Rafal Damian Figaj; Laura Vanoli. 2017. "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 149, no. : 798-814.
This paper presents a one-dimensional finite-volume model of an unglazed photovoltaic/thermal (PVT) solar collector. The unit consists of a conventional solar photovoltaic (PV) collector coupled with a suitable heat exchanger. In particular, the collector includes a roll bond heat exchanger and it is not equipped with back and frame insulation. The system is discretized along the flow direction (longitudinal) of the cogenerative collector. For each finite-volume element of the discretized computational domain, mass and energy balances are implemented. The collector geometry and materials parameters are taken from a commercially available device. An on-field experimental investigation is performed in order to validate the proposed model. The model is used to evaluate both electrical and thermodynamic parameters for each element of the domain and for fixed operating conditions. Finally, a sensitivity analysis is also performed in order to investigate the energetic performance of the cogenerative collector as a function of the main design/environmental parameters.
Francesco Calise; Rafal Damian Figaj; Laura Vanoli. Experimental and Numerical Analyses of a Flat Plate Photovoltaic/Thermal Solar Collector. Energies 2017, 10, 491 .
AMA StyleFrancesco Calise, Rafal Damian Figaj, Laura Vanoli. Experimental and Numerical Analyses of a Flat Plate Photovoltaic/Thermal Solar Collector. Energies. 2017; 10 (4):491.
Chicago/Turabian StyleFrancesco Calise; Rafal Damian Figaj; Laura Vanoli. 2017. "Experimental and Numerical Analyses of a Flat Plate Photovoltaic/Thermal Solar Collector." Energies 10, no. 4: 491.
Francesco Calise; Rafal Damian Figaj; Nicola Massarotti; Alessandro Mauro; Laura Vanoli. Polygeneration system based on PEMFC, CPVT and electrolyzer: Dynamic simulation and energetic and economic analysis. Applied Energy 2017, 192, 530 -542.
AMA StyleFrancesco Calise, Rafal Damian Figaj, Nicola Massarotti, Alessandro Mauro, Laura Vanoli. Polygeneration system based on PEMFC, CPVT and electrolyzer: Dynamic simulation and energetic and economic analysis. Applied Energy. 2017; 192 ():530-542.
Chicago/Turabian StyleFrancesco Calise; Rafal Damian Figaj; Nicola Massarotti; Alessandro Mauro; Laura Vanoli. 2017. "Polygeneration system based on PEMFC, CPVT and electrolyzer: Dynamic simulation and energetic and economic analysis." Applied Energy 192, no. : 530-542.
Alberto Carotenuto; Giuseppina De Luca; Salvatore Fabozzi; Rafal Damian Figaj; Marina Iorio; Nicola Massarotti; Laura Vanoli. Energy Analysis of a Small Geothermal District Heating System in Southern Italy. International Journal of Heat and Technology 2016, 34, S519 -S527.
AMA StyleAlberto Carotenuto, Giuseppina De Luca, Salvatore Fabozzi, Rafal Damian Figaj, Marina Iorio, Nicola Massarotti, Laura Vanoli. Energy Analysis of a Small Geothermal District Heating System in Southern Italy. International Journal of Heat and Technology. 2016; 34 (S2):S519-S527.
Chicago/Turabian StyleAlberto Carotenuto; Giuseppina De Luca; Salvatore Fabozzi; Rafal Damian Figaj; Marina Iorio; Nicola Massarotti; Laura Vanoli. 2016. "Energy Analysis of a Small Geothermal District Heating System in Southern Italy." International Journal of Heat and Technology 34, no. S2: S519-S527.
Francesco Calise; Massimo Dentice D’Accadia; Rafal Damian Figaj; Laura Vanoli. Thermoeconomic optimization of a solar-assisted heat pump based on transient simulations and computer Design of Experiments. Energy Conversion and Management 2016, 125, 166 -184.
AMA StyleFrancesco Calise, Massimo Dentice D’Accadia, Rafal Damian Figaj, Laura Vanoli. Thermoeconomic optimization of a solar-assisted heat pump based on transient simulations and computer Design of Experiments. Energy Conversion and Management. 2016; 125 ():166-184.
Chicago/Turabian StyleFrancesco Calise; Massimo Dentice D’Accadia; Rafal Damian Figaj; Laura Vanoli. 2016. "Thermoeconomic optimization of a solar-assisted heat pump based on transient simulations and computer Design of Experiments." Energy Conversion and Management 125, no. : 166-184.
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.
Francesco Calise; Massimo Dentice D'Accadia; Rafal Damian Figaj; Laura Vanoli. A novel solar-assisted heat pump driven by photovoltaic/thermal collectors: Dynamic simulation and thermoeconomic optimization. Energy 2016, 95, 346 -366.
AMA StyleFrancesco Calise, Massimo Dentice D'Accadia, Rafal Damian Figaj, Laura Vanoli. A novel solar-assisted heat pump driven by photovoltaic/thermal collectors: Dynamic simulation and thermoeconomic optimization. Energy. 2016; 95 ():346-366.
Chicago/Turabian StyleFrancesco Calise; Massimo Dentice D'Accadia; Rafal Damian Figaj; Laura Vanoli. 2016. "A novel solar-assisted heat pump driven by photovoltaic/thermal collectors: Dynamic simulation and thermoeconomic optimization." Energy 95, no. : 346-366.