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Gas engine-driven heat pumps are an interesting option to satisfy space heating and cooling demands aiming at energy saving, environmental impact and operating costs’ reduction. This work presents (i) a comprehensive review updated on gas engine-driven heat pumps research activities, (ii) the investigation of the central role of this technology in the air conditioning sector and (iii) the future perspectives regarding gas engine heat pumps’ diffusion in the context of the energy sector decarbonisation. The outcomes highlight that gas engine heat pumps could have better environmental performance compared to electric heat pumps both in heating and cooling operations. Moreover, they could play a pivotal role in the fight against climate change and energy security since they can guarantee an energy mix differentiation moving from electricity to natural gas and renewable gases’ usage. Indeed, by 2030, a lower-carbon gas grid could be supported by renewable gases. A further investigation has concerned diffusion of gas heat pumps activated from biofuels produced by local biomass in an energy community scenario based on a low-temperature energy district network. A novel biomass-based GEHP interacting with a low-temperature district heating network is proposed here. This system could save more than 30% of primary energy compared to biomass-fuelled boilers.
Carlo Roselli; Elisa Marrasso; Maurizio Sasso. Gas Engine-Driven Heat Pumps for Small-Scale Applications: State-of-the-Art and Future Perspectives. Energies 2021, 14, 4845 .
AMA StyleCarlo Roselli, Elisa Marrasso, Maurizio Sasso. Gas Engine-Driven Heat Pumps for Small-Scale Applications: State-of-the-Art and Future Perspectives. Energies. 2021; 14 (16):4845.
Chicago/Turabian StyleCarlo Roselli; Elisa Marrasso; Maurizio Sasso. 2021. "Gas Engine-Driven Heat Pumps for Small-Scale Applications: State-of-the-Art and Future Perspectives." Energies 14, no. 16: 4845.
The Clean Energy for all Europeans Package pushes for the diffusion of renewable energy communities, introducing their definition in the European legislative framework. Following this interest, this paper analyses the energy and environmental performance of a renewable energy community composed of two office buildings located in Naples (Italy). Each building has a rooftop photovoltaic plant and one office presents an electric vehicle. The heating and cooling demands of both offices are satisfied by two reversible air to water heat pumps. The offices are connected through an electric microgrid and they are in parallel with a power grid. Buildings and plants are modelled and simulated by means of TRNSYS 17 simulation software. The first analysis has concerned the comparison of the results achieved in renewable energy community configuration and from individual buildings in terms of quantity of electricity imported, exported from/to power grid and consumed on-site. The share of self-consumed photovoltaic electricity rises up to 79% when energy sharing is allowed. The second analysis has been carried out to evaluate the energy and environmental performance of a renewable energy community by means of fixed and hourly varying values for power grid efficiency and emission factors for electricity. The use of time-dependent indicators has led to a lower community primary energy demand and carbon dioxide emissions of 18% and 12%, respectively, in comparison with the scenario in which the fixed parameters have been adopted.
Francesca Ceglia; Elisa Marrasso; Carlo Roselli; Maurizio Sasso. Small Renewable Energy Community: The Role of Energy and Environmental Indicators for Power Grid. Sustainability 2021, 13, 2137 .
AMA StyleFrancesca Ceglia, Elisa Marrasso, Carlo Roselli, Maurizio Sasso. Small Renewable Energy Community: The Role of Energy and Environmental Indicators for Power Grid. Sustainability. 2021; 13 (4):2137.
Chicago/Turabian StyleFrancesca Ceglia; Elisa Marrasso; Carlo Roselli; Maurizio Sasso. 2021. "Small Renewable Energy Community: The Role of Energy and Environmental Indicators for Power Grid." Sustainability 13, no. 4: 2137.
Improvements in using geothermal sources can be attained through the installation of power plants taking advantage of low and medium enthalpy available in poorly exploited geothermal sites. Geothermal fluids at medium and low temperature could be considered to feed binary cycle power plants using organic fluids for electricity “production” or in cogeneration configuration. The improvement in the use of geothermal aquifers at low-medium enthalpy in small deep sites favours the reduction of drilling well costs, and in addition, it allows the exploitation of local resources in the energy districts. The heat exchanger evaporator enables the thermal heat exchange between the working fluid (which is commonly an organic fluid for an Organic Rankine Cycle) and the geothermal fluid (supplied by the aquifer). Thus, it has to be realised taking into account the thermodynamic proprieties and chemical composition of the geothermal field. The geothermal fluid is typically very aggressive, and it leads to the corrosion of steel traditionally used in the heat exchangers. This paper analyses the possibility of using plastic material in the constructions of the evaporator installed in an Organic Rankine Cycle plant in order to overcome the problems of corrosion and the increase of heat exchanger thermal resistance due to the fouling effect. A comparison among heat exchangers made of commonly used materials, such as carbon, steel, and titanium, with alternative polymeric materials has been carried out. This analysis has been built in a mathematical approach using the correlation referred to in the literature about heat transfer in single-phase and two-phase fluids in a tube and/or in the shell side. The outcomes provide the heat transfer area for the shell and tube heat exchanger with a fixed thermal power size. The results have demonstrated that the plastic evaporator shows an increase of 47.0% of the heat transfer area but an economic installation cost saving of 48.0% over the titanium evaporator.
Francesca Ceglia; Adriano Macaluso; Elisa Marrasso; Maurizio Sasso; Laura Vanoli. Modelling of Polymeric Shell and Tube Heat Exchangers for Low-Medium Temperature Geothermal Applications. Energies 2020, 13, 2737 .
AMA StyleFrancesca Ceglia, Adriano Macaluso, Elisa Marrasso, Maurizio Sasso, Laura Vanoli. Modelling of Polymeric Shell and Tube Heat Exchangers for Low-Medium Temperature Geothermal Applications. Energies. 2020; 13 (11):2737.
Chicago/Turabian StyleFrancesca Ceglia; Adriano Macaluso; Elisa Marrasso; Maurizio Sasso; Laura Vanoli. 2020. "Modelling of Polymeric Shell and Tube Heat Exchangers for Low-Medium Temperature Geothermal Applications." Energies 13, no. 11: 2737.
Energy systems face great challenges from both the supply and demand sides. Strong efforts have been devoted to investigate technological solutions aiming at overcoming the problems of fossil fuel depletion and the environmental issues due to the carbon emissions. Hybrid (activated by both renewables and fossil fuels) distributed energy systems can be considered a very effective and promising technology to replace traditional centralized energy systems. As a most peculiar characteristic, they reduce the use of fossil sources and transmission and distribution losses along the main power grid and contribute to electric peak shaving and partial-loads losses reduction. As a direct consequence, the transition from centralized towards hybrid decentralized energy systems leads to a new role for citizens, shifting from a passive energy consumer to active prosumers able to produce energy and distribute energy. Such a complex system needs to be carefully modelled to account for the energy interactions with prosumers, local microgrids and main grids. Thus, the aim of this paper is to investigate the performance of a hybrid distributed energy system serving an urban community and modelled within the framework of agent-based theory. The model is of general validity and estimates (i) the layout of the links along which electricity is distributed among agents in the local microgrid, (ii) electricity exchanged among agents and (iii) electricity exported to the main power grid or imported from it. A scenario analysis has been conducted at varying the distance of connection among prosumers, the installed capacity in the area and the usage of links. The distributed energy system has been compared to a centralized energy system in which the electricity requests of the urban community are satisfied by taking electricity from the main grid. The comparison analysis is carried out from an energy, environmental and economic point of view by evaluating the primary energy saving, avoided carbon dioxide emissions and the simple payback period indices.
Alberto Fichera; Elisa Marrasso; Maurizio Sasso; Rosaria Volpe. Energy, Environmental and Economic Performance of an Urban Community Hybrid Distributed Energy System. Energies 2020, 13, 2545 .
AMA StyleAlberto Fichera, Elisa Marrasso, Maurizio Sasso, Rosaria Volpe. Energy, Environmental and Economic Performance of an Urban Community Hybrid Distributed Energy System. Energies. 2020; 13 (10):2545.
Chicago/Turabian StyleAlberto Fichera; Elisa Marrasso; Maurizio Sasso; Rosaria Volpe. 2020. "Energy, Environmental and Economic Performance of an Urban Community Hybrid Distributed Energy System." Energies 13, no. 10: 2545.
Combined heat and power generation traditionally allows for higher energy performance than separate production of heat and electricity. However, the significant increase of the renewable energy sources contribution in electricity production has spatially and temporally modified the context in which polygeneration systems operate and the energy and environmental profitability of these technologies could be undetermined. In such a situation it seems interesting to investigate the influence of the power grid efficiency variation on the polygeneration systems performance. For this purpose energy and environmental performance of a proposed system based on combined production are compared to those achieved by a conventional system based on separate production. The primary energy demand of conventional and proposed systems due to electricity depends on the efficiency of the national electric energy system features. In this paper, this efficiency is considered to be time-varying (hour-by-hour) and it is further taken into account that the electric system efficiency changes in different regions of the same Country. According to Italian day ahead market of electricity the national territory is divided in 6 zones; two of them (Centre-North zone and Centre-South zone) will be specifically considered and compared hereinafter. The differences that arise in results are also assessed with respect to the case in which national and local average efficiency is taken into account. The environmental analysis is performed considering the average and the time-varying Italian and local electricity emission factors. The results have highlighted that the cogeneration system feasibility depends upon the variability of these factors. Indeed, referring to thermoelectric-based power grid efficiency, only in Centre-North zone is more energetically convenient to produce heat and power by separate production systems. The environmental analysis outcomes have showed the same trend of energy analysis results in all the considered zones underlining that the evolution towards sustainability in Smart Grids requires an integrated approach.
C. Roselli; E. Marrasso; F. Tariello; M. Sasso. How different power grid efficiency scenarios affect the energy and environmental feasibility of a polygeneration system. Energy 2020, 201, 117576 .
AMA StyleC. Roselli, E. Marrasso, F. Tariello, M. Sasso. How different power grid efficiency scenarios affect the energy and environmental feasibility of a polygeneration system. Energy. 2020; 201 ():117576.
Chicago/Turabian StyleC. Roselli; E. Marrasso; F. Tariello; M. Sasso. 2020. "How different power grid efficiency scenarios affect the energy and environmental feasibility of a polygeneration system." Energy 201, no. : 117576.
Electric air-conditioning systems driven by electricity from a wind turbine can be defined as wind electric and cooling systems according to the definition of solar-activated air-conditioners. They can potentially contribute to reduce primary energy demand and CO2 emission in the civil sector. In this paper, mini wind turbines are considered coupled with a ground source heat pump in order to serve an office building for air-conditioning and supply the electricity surplus for the pure electric load of the user. Different plant configurations are considered. First of all, assessments with two kinds of wind turbines (5–5.5 kW), vertical and horizontal axis, are performed, also considering the coupling with one and two identical wind generators. Secondly, to better use on-site electricity, a parametric study is proposed taking into account different battery storage system sizes (3.2–9.6 kWh). Finally, the plant is simulated in two locations: Naples and Cagliari. Simulation results demonstrate that the source availability mainly affects the system performance. In Cagliari, the primary energy reduction per kWh of final energy demand (for pure electric load, space heating, and cooling) is equal to 1.24, 54.8% more than in Naples. In addition, the storage system limits the interaction with the power grid, lowering the exported electricity from about 50% to about 27% for Naples and from 63% to 50% for Cagliari. The fraction of the load met by renewable energy accounts for up to 25% for Naples and 48% for Cagliari.
Carlo Roselli; Maurizio Sasso; Francesco Tariello. A Wind Electric-Driven Combined Heating, Cooling, and Electricity System for an Office Building in Two Italian Cities. Energies 2020, 13, 895 .
AMA StyleCarlo Roselli, Maurizio Sasso, Francesco Tariello. A Wind Electric-Driven Combined Heating, Cooling, and Electricity System for an Office Building in Two Italian Cities. Energies. 2020; 13 (4):895.
Chicago/Turabian StyleCarlo Roselli; Maurizio Sasso; Francesco Tariello. 2020. "A Wind Electric-Driven Combined Heating, Cooling, and Electricity System for an Office Building in Two Italian Cities." Energies 13, no. 4: 895.
The current energy and environmental target is the completely integration of the energy produced from different sources taking into account the renewables. The traditional power grids or thermal-cooling and heating conversion systems converge to the use of smart grids and to the planning of intelligent local organizations through energy integration techniques. This cannot be assessed as an isolated problem but an integrated one. The right construction of smart society is to match different challenges achieving sustainable energy systems not only from the point of view of energy consumption in different sectors (civil, industrial, agriculture, transport) and of the related of pollutants emissions, but considering simultaneously the relation with the socio-economic impact. The aim of this paper is firstly to examine the theories-approach to smart energy systems at the community level, the scientific literature of the smart energy community, the benefits of their potential applications in the smart energy municipalities. Finally, it manages the aspects related to smart energy community adoption with a multidisciplinary approach linking the technical conditions to the socio-economic systems of territorial planning. The main finding is that the concept of the intelligent energy community is strictly related to a coherent and intersectoral approach searching the best control strategy to satisfy all energy requirements. Moreover, the road leading to the smart energy community is essential to build the more sustainable renewable energy systems, to collect storage synergies between energy sub-sectors through the energy sharing and finally to exploit economically efficient sources.
F. Ceglia; P. Esposito; E. Marrasso; M. Sasso. From smart energy community to smart energy municipalities: Literature review, agendas and pathways. Journal of Cleaner Production 2020, 254, 120118 .
AMA StyleF. Ceglia, P. Esposito, E. Marrasso, M. Sasso. From smart energy community to smart energy municipalities: Literature review, agendas and pathways. Journal of Cleaner Production. 2020; 254 ():120118.
Chicago/Turabian StyleF. Ceglia; P. Esposito; E. Marrasso; M. Sasso. 2020. "From smart energy community to smart energy municipalities: Literature review, agendas and pathways." Journal of Cleaner Production 254, no. : 120118.
The power system has faced unprecedented challenges in the last decade caused by many factors: the introduction of the open electricity market, the diffusion of distributed generation, the growth of the electricity production from the no-programmable renewable energy sources, etc. In this framework the power generation system turned extremely varied and complex. In addition, European Union highlighted the need to increase the energy efficiency to achieve the goal of 30% savings in primary energy consumption by 2030 compared to 1990 levels. Since the goal is defined on primary energy level, the electric efficiency indicators are central issues in the assessment of energy saving measures that affect electricity demand and involve different processes. However, all European Directives set electric efficiency indicators and carbon dioxide emission factors to fixed values neglecting their intrinsic time-variability due to the primary energy source mix used in the electricity generation hour by hour. The use of a fixed value for these parameters could lead to inaccurate or wrong results in various processes. Indeed, they have an impact on the choice of electricity versus fossil-fuel based technologies. In particular, they affect both the possibility for a product to retain access to European market, and its specific rating in an energy labelling class. Moreover, in the case of the modelling of any energy system that interacts with the power grid the electric efficiency indicators are the crucial factors to assess the potential primary energy savings of the technologies. On another level, the use of an incorrect value of energy and environmental indicators in the evaluation of the primary energy savings of those energy efficiency measures supported by economic mechanisms (as white certificates, policy mechanisms supporting renewables, tax deductions), could lead to an underestimation or an overestimation of the economic support. In this context, the aim of this paper is to perform an hourly analysis of the Italian electricity production mix evaluating the contribution of each primary energy source. The novelty of this approach is related to the evaluation of the electricity produced by each fossil and renewable source with an hourly time resolution over the years 2016 and 2017. Four power plant efficiency indicators and three carbon dioxide emission factors have been also defined and determined on hourly basis for both considered years. The results of the analysis have showed the strongly variability of the considered parameters across the years, the seasons and hour by hour depending upon the hourly power generation mix.
E. Marrasso; C. Roselli; M. Sasso. Electric efficiency indicators and carbon dioxide emission factors for power generation by fossil and renewable energy sources on hourly basis. Energy Conversion and Management 2019, 196, 1369 -1384.
AMA StyleE. Marrasso, C. Roselli, M. Sasso. Electric efficiency indicators and carbon dioxide emission factors for power generation by fossil and renewable energy sources on hourly basis. Energy Conversion and Management. 2019; 196 ():1369-1384.
Chicago/Turabian StyleE. Marrasso; C. Roselli; M. Sasso. 2019. "Electric efficiency indicators and carbon dioxide emission factors for power generation by fossil and renewable energy sources on hourly basis." Energy Conversion and Management 196, no. : 1369-1384.
A novel energy index to assess plants capable of producing electricity from a renewable source is introduced in this paper. This index allows to evaluate the bidirectional energy flows on the external power grid, due the electricity exported to the grid from a renewable-based system and the electricity imported from the grid, in comparison to the electricity demand of a building. In this paper, attention is focused on a solar photovoltaic (PV) system satisfying the energy demands of an office building. Electricity from the solar PV system is partly used to operate a ground source heat pump to meet space heating and cooling demands, and partly used for other electrical loads. An energy, economic and environmental impact analysis of the proposed system is also reported. A sensitivity analysis varying the photovoltaic system capacity (2.5–10.0 kW) and the battery storage size (3.2–9.6 kWh) is also carried out. A saving in terms of primary energy and a carbon dioxide emission reduction can be obtained by a renewable-based system compared to a conventional one consisting of a natural gas fuelled boiler for space heating, an electric chiller for space cooling and the national power grid for electricity demand.
C. Roselli; G. Diglio; M. Sasso; F. Tariello. A novel energy index to assess the impact of a solar PV-based ground source heat pump on the power grid. Renewable Energy 2019, 143, 488 -500.
AMA StyleC. Roselli, G. Diglio, M. Sasso, F. Tariello. A novel energy index to assess the impact of a solar PV-based ground source heat pump on the power grid. Renewable Energy. 2019; 143 ():488-500.
Chicago/Turabian StyleC. Roselli; G. Diglio; M. Sasso; F. Tariello. 2019. "A novel energy index to assess the impact of a solar PV-based ground source heat pump on the power grid." Renewable Energy 143, no. : 488-500.
The energy demand for the air-conditioning of buildings has shown a very significant growth trend in the last two decades. In this paper three alternative hygroscopic materials for desiccant wheels are compared considering the operation of the air handling unit they are installed in. The analyses are performed by means of the TRNSYS 17® software, simulating the plant with the desiccant wheel made of: silica-gel, i.e., the filling actually used in the experimental plant desiccant wheel of the University of Sannio Laboratory; [email protected] (MILGO), a composite material, consisting of graphite oxide dispersed in a MIL101 metal organic framework structure; Campanian Ignimbrite, a naturally occurring tuff, rich in phillipsite and chabazite zeolites, widespread in the Campania region, in Southern Italy. The air-conditioning system analyzed serves a university classroom located in Benevento, and it is activated by the thermal energy of a solar field for which three surfaces are considered: about 20, 27 and 34 m2. The results demonstrate that a primary energy saving of about 20%, 29%, 15% can be reached with silica-gel, MILGO and zeolite-rich tuff desiccant wheel based air handling units, respectively.
Piero Bareschino; Francesco Pepe; Carlo Roselli; Maurizio Sasso; Francesco Tariello. Desiccant-Based Air Handling Unit Alternatively Equipped with Three Hygroscopic Materials and Driven by Solar Energy. Energies 2019, 12, 1543 .
AMA StylePiero Bareschino, Francesco Pepe, Carlo Roselli, Maurizio Sasso, Francesco Tariello. Desiccant-Based Air Handling Unit Alternatively Equipped with Three Hygroscopic Materials and Driven by Solar Energy. Energies. 2019; 12 (8):1543.
Chicago/Turabian StylePiero Bareschino; Francesco Pepe; Carlo Roselli; Maurizio Sasso; Francesco Tariello. 2019. "Desiccant-Based Air Handling Unit Alternatively Equipped with Three Hygroscopic Materials and Driven by Solar Energy." Energies 12, no. 8: 1543.
In this paper four different air conditioning systems designed for a building located in Naples, are investigated. The first plant is based on distributed energy conversion systems: twelve boilers and twelve chillers. In the second solution the space heating demand is satisfied by a centralised boiler while the cooling load is met by a chiller. The third option consists of a trigeneration plant. The fourth configuration is composed by an electric heat pump supplying space heating and cooling and a centralised boiler used for domestic needs. Dynamic simulations have been carried out to compare the energy and environmental performance of the centralised systems with those achieved by the distributed one. Besides, as further users, for the third option, two electric vehicles charged by the cogenerated electricity surplus are compared to diesel cars. The results show that the best energy and environmental performance are achieved by the cogenerator-based system, with a primary energy demand of 120.6 MWh/y and equivalent dioxide carbon emissions of 25.2 t/y in the configuration without vehicles. This result is also confirmed with electric and diesel vehicles. The energy competitiveness of the plant with electric heat pump is achieved only in a scenario with a high penetration of renewable energy sources.
E. Marrasso; C. Roselli; M. Sasso; F. Tariello. Comparison of centralized and decentralized air-conditioning systems for a multi-storey/multi users building integrated with electric and diesel vehicles and considering the evolution of the national energy system. Energy 2019, 177, 319 -333.
AMA StyleE. Marrasso, C. Roselli, M. Sasso, F. Tariello. Comparison of centralized and decentralized air-conditioning systems for a multi-storey/multi users building integrated with electric and diesel vehicles and considering the evolution of the national energy system. Energy. 2019; 177 ():319-333.
Chicago/Turabian StyleE. Marrasso; C. Roselli; M. Sasso; F. Tariello. 2019. "Comparison of centralized and decentralized air-conditioning systems for a multi-storey/multi users building integrated with electric and diesel vehicles and considering the evolution of the national energy system." Energy 177, no. : 319-333.
The paper examines a solar electric driven heat pump serving an office building located in southern Italy. To satisfy space heating and cooling demand a heat pump activated by electric energy available from solar photovoltaic plant is here considered. In order to improve the self-consumption of electricity available from photovoltaic system different configurations were considered introducing an electric storage and an electric vehicle. Dynamic simulations to evaluate energy performance of the system varying photovoltaic peak power (4.5–7.5 kW) have been carried out. The proposed system achieves a fossil fuel primary energy saving up to about 96% in comparison to the reference conventional system based on a natural gas fired boiler, an electric chiller and the national electric grid. The results show that fossil fuel primary energy saving is higher when there are no storage battery and electric vehicle.
Carlo Roselli; Maurizio Sasso; Francesco Tariello. Integration between electric heat pump and PV system to increase self-consumption of an office application. Renewable Energy and Environmental Sustainability 2017, 2, 28 .
AMA StyleCarlo Roselli, Maurizio Sasso, Francesco Tariello. Integration between electric heat pump and PV system to increase self-consumption of an office application. Renewable Energy and Environmental Sustainability. 2017; 2 ():28.
Chicago/Turabian StyleCarlo Roselli; Maurizio Sasso; Francesco Tariello. 2017. "Integration between electric heat pump and PV system to increase self-consumption of an office application." Renewable Energy and Environmental Sustainability 2, no. : 28.
In this paper, three alternative layouts (scenarios) of an innovative solar-assisted hybrid desiccant-based air handling unit (AHU) are investigated through dynamic simulations. Performance is evaluated with respect to a reference system and compared to those of the innovative plant without modifications. For each scenario, different collector types, surfaces and tilt angles are considered. The effect of the solar thermal energy surplus exploitation for other low-temperature uses is also investigated. The first alternative scenario consists of the recovery of the heat rejected by the condenser of the chiller to pre-heat the regeneration air. The second scenario considers the pre-heating of regeneration air with the warmer regeneration air exiting the desiccant wheel (DW). The last scenario provides pre-cooling of the process air before entering the DW. Results reveal that the plants with evacuated solar collectors (SC) can ensure primary energy savings (15%–24%) and avoid equivalent CO2 emissions (14%–22%), about 10 percentage points more than those with flat-plate collectors, when the solar thermal energy is used only for air conditioning and the collectors have the best tilt angle. If all of the solar thermal energy is considered, the best results with evacuated tube collectors are approximately 73% in terms of primary energy saving, 71% in terms of avoided equivalent CO2 emissions and a payback period of six years.
Giovanni Angrisani; Carlo Roselli; Maurizio Sasso; Francesco Tariello; Giuseppe Peter Vanoli. Performance Assessment of a Solar-Assisted Desiccant-Based Air Handling Unit Considering Different Scenarios. Energies 2016, 9, 724 .
AMA StyleGiovanni Angrisani, Carlo Roselli, Maurizio Sasso, Francesco Tariello, Giuseppe Peter Vanoli. Performance Assessment of a Solar-Assisted Desiccant-Based Air Handling Unit Considering Different Scenarios. Energies. 2016; 9 (9):724.
Chicago/Turabian StyleGiovanni Angrisani; Carlo Roselli; Maurizio Sasso; Francesco Tariello; Giuseppe Peter Vanoli. 2016. "Performance Assessment of a Solar-Assisted Desiccant-Based Air Handling Unit Considering Different Scenarios." Energies 9, no. 9: 724.
A hybrid solar-assisted trigeneration system is analyzed in this paper. The system is composed of a 20 m2 solar field of evacuated tube collectors, a natural gas fired micro combined heat and power system delivering 12.5 kW of thermal power, an absorption heat pump (AHP) with a nominal cooling power of 17.6 kW, two storage tanks (hot and cold) and an electric auxiliary heater (AH). The plant satisfies the energy demand of an office building located in Naples (Southern Italy). The electric energy of the cogenerator is used to meet the load and auxiliaries electric demand; the interactions with the grid are considered in cases of excess or over requests. This hybrid solution is interesting for buildings located in cities or historical centers with limited usable roof surface to install a conventional solar heating and cooling (SHC) system able to achieve high solar fraction (SF). The results of dynamic simulation show that a tilt angle of 30° maximizes the SF of the system on annual basis achieving about 53.5%. The influence on the performance of proposed system of the hot water storage tank (HST) characteristics (volume, insulation) is also studied. It is highlighted that the SF improves when better insulated and bigger HSTs are considered. A maximum SF of about 58.2% is obtained with a 2000 L storage, whereas the lower thermal losses take place with a better insulated 1000 L tank.
Elisa Marrasso; Carlo Roselli; Maurizio Sasso; Francesco Tariello. Analysis of a Hybrid Solar-Assisted Trigeneration System. Energies 2016, 9, 705 .
AMA StyleElisa Marrasso, Carlo Roselli, Maurizio Sasso, Francesco Tariello. Analysis of a Hybrid Solar-Assisted Trigeneration System. Energies. 2016; 9 (9):705.
Chicago/Turabian StyleElisa Marrasso; Carlo Roselli; Maurizio Sasso; Francesco Tariello. 2016. "Analysis of a Hybrid Solar-Assisted Trigeneration System." Energies 9, no. 9: 705.
The paper investigates the introduction of a solar heating and cooling system in an office building characterized by low energy demand with respect to the current national building stock and located in Southern Italy. Dynamic simulations are carried out in order to evaluate the thermo-economic performance of the analyzed system considering different solar panel technologies (flat plate and evacuated tube), tilt angles (10–70°), collecting areas (30–60 m2), hot and cold storage sizes, reference emission factors, electricity and natural gas unitary prices. To satisfy cooling demand a small scale adsorption chiller activated by thermal energy available from solar collectors is considered. The solar heating and cooling system demonstrated primary energy saving and equivalent dioxide carbon emission reduction higher than 23% in comparison to the reference conventional system. The results show that the solar energy system will be competitive when the electricity and natural gas prices will be high and strong government incentives will be provided.
Giovanni Angrisani; Evgueniy Entchev; Carlo Roselli; Maurizio Sasso; Francesco Tariello; Wahiba Yaici. Dynamic simulation of a solar heating and cooling system for an office building located in Southern Italy. Applied Thermal Engineering 2016, 103, 377 -390.
AMA StyleGiovanni Angrisani, Evgueniy Entchev, Carlo Roselli, Maurizio Sasso, Francesco Tariello, Wahiba Yaici. Dynamic simulation of a solar heating and cooling system for an office building located in Southern Italy. Applied Thermal Engineering. 2016; 103 ():377-390.
Chicago/Turabian StyleGiovanni Angrisani; Evgueniy Entchev; Carlo Roselli; Maurizio Sasso; Francesco Tariello; Wahiba Yaici. 2016. "Dynamic simulation of a solar heating and cooling system for an office building located in Southern Italy." Applied Thermal Engineering 103, no. : 377-390.
Desiccant-based air handling units can provide significant operational advantages and can use solar energy as the main heat source. Hereinafter a plant equipped with a silica-gel desiccant wheel is analyzed for two Italian locations (Benevento and Milano). A parametric study involving collectors types, surfaces, tilt angles and installation site has been performed. The proposed system has been compared with a conventional HVAC unit, through dynamic simulations. In terms of energy and environmental analysis, solar desiccant systems should always be preferred to conventional ones, even when the solar thermal energy surplus is fully dissipated. A maximum primary energy saving of about 10% and 20% with flat plat and evacuated tube collectors, respectively, occurs in both locations. The savings increase up to about 58% and 72% in Benevento and 43% and 58% in Milano, when the solar heat excess is completely used for further energy demands. One observes that systems with evacuated tube collectors are preferable where the available space for the solar field is small, instead with larger surfaces flat plate collectors are advantaged. In terms of economic analysis, the shortest payback periods are 6 and 8 years for Benevento and Milano, respectively.
G. Angrisani; C. Roselli; M. Sasso; F. Tariello. Dynamic performance assessment of a solar-assisted desiccant-based air handling unit in two Italian cities. Energy Conversion and Management 2016, 113, 331 -345.
AMA StyleG. Angrisani, C. Roselli, M. Sasso, F. Tariello. Dynamic performance assessment of a solar-assisted desiccant-based air handling unit in two Italian cities. Energy Conversion and Management. 2016; 113 ():331-345.
Chicago/Turabian StyleG. Angrisani; C. Roselli; M. Sasso; F. Tariello. 2016. "Dynamic performance assessment of a solar-assisted desiccant-based air handling unit in two Italian cities." Energy Conversion and Management 113, no. : 331-345.
Desiccant-based HVAC systems are nowadays a convenient alternative to conventional systems based on dehumidification by cooling, because they allow the reduction of equivalent CO2 emissions, electric peak loads and black-outs, as well as energy savings, interesting payback periods in several cases, better indoor humidity control and air quality, separate control of thermal sensible and latent loads. Their coupling with small scale natural gas-fired cogenerators is also suitable as thermal energy required for desiccant regeneration can be conveniently recovered from the microcogenerator. In this paper, the main improvements of an innovative desiccant-based HVAC system, located in Southern Italy (Mediterranean climate), are presented. To this aim, three different desiccant system configurations are experimentally analysed, while a conventional HVAC system based on dehumidification by cooling is evaluated by means of numerical approach. Firstly, the primary energy savings (up to 20-25%) and the reductions of equivalent CO2 emissions (up to 40-50%) of the desiccant systems compared to the conventional one are calculated when considering chillers with different energy efficiency ratio values. Successively, the above mentioned indices are evaluated as a function of the effectiveness of the heat exchanger and the cooling air humidifier installed in the proposed desiccant system configuration: primary energy savings up to 25-28% and reductions of equivalent CO2 emissions up to 35-40% are obtained
G. Angrisani; Francesco Minichiello; M. Sasso. Improvements of an unconventional desiccant air conditioning system based on experimental investigations. Energy Conversion and Management 2016, 112, 423 -434.
AMA StyleG. Angrisani, Francesco Minichiello, M. Sasso. Improvements of an unconventional desiccant air conditioning system based on experimental investigations. Energy Conversion and Management. 2016; 112 ():423-434.
Chicago/Turabian StyleG. Angrisani; Francesco Minichiello; M. Sasso. 2016. "Improvements of an unconventional desiccant air conditioning system based on experimental investigations." Energy Conversion and Management 112, no. : 423-434.
Giovanni Angrisani; Michele Canelli; Carlo Roselli; Maurizio Sasso. Microcogeneration in buildings with low energy demand in load sharing application. Energy Conversion and Management 2015, 100, 78 -89.
AMA StyleGiovanni Angrisani, Michele Canelli, Carlo Roselli, Maurizio Sasso. Microcogeneration in buildings with low energy demand in load sharing application. Energy Conversion and Management. 2015; 100 ():78-89.
Chicago/Turabian StyleGiovanni Angrisani; Michele Canelli; Carlo Roselli; Maurizio Sasso. 2015. "Microcogeneration in buildings with low energy demand in load sharing application." Energy Conversion and Management 100, no. : 78-89.
Giovanni Angrisani; Michele Canelli; Carlo Roselli; Maurizio Sasso. Integration between electric vehicle charging and micro-cogeneration system. Energy Conversion and Management 2015, 98, 115 -126.
AMA StyleGiovanni Angrisani, Michele Canelli, Carlo Roselli, Maurizio Sasso. Integration between electric vehicle charging and micro-cogeneration system. Energy Conversion and Management. 2015; 98 ():115-126.
Chicago/Turabian StyleGiovanni Angrisani; Michele Canelli; Carlo Roselli; Maurizio Sasso. 2015. "Integration between electric vehicle charging and micro-cogeneration system." Energy Conversion and Management 98, no. : 115-126.
Piero Bareschino; Giuseppe Diglio; Francesco Pepe; Giovanni Angrisani; Carlo Roselli; Maurizio Sasso. Modelling of a rotary desiccant wheel: Numerical validation of a Variable Properties Model. Applied Thermal Engineering 2015, 78, 640 -648.
AMA StylePiero Bareschino, Giuseppe Diglio, Francesco Pepe, Giovanni Angrisani, Carlo Roselli, Maurizio Sasso. Modelling of a rotary desiccant wheel: Numerical validation of a Variable Properties Model. Applied Thermal Engineering. 2015; 78 ():640-648.
Chicago/Turabian StylePiero Bareschino; Giuseppe Diglio; Francesco Pepe; Giovanni Angrisani; Carlo Roselli; Maurizio Sasso. 2015. "Modelling of a rotary desiccant wheel: Numerical validation of a Variable Properties Model." Applied Thermal Engineering 78, no. : 640-648.