1,721,068 research outputs found
Yearly operation of a building-integrated microcogeneration system in south Italy: energy and economic analyses
No full textThis article investigates the yearly operation of a building-integrated micro-cogeneration system through transient simulations; both energy and economic performance of the proposed system are analyzed and compared with those of a conventional system based on separate energy production in order to assess the potential savings. The energy comparison is carried out in terms of primary energy with respect to the specific Italian electricity mix; the economic analysis is performed by considering both the operating and capital costs, with the energy unit costs as well as the incentives for supporting the cogeneration technology evaluated according to the Italian scenario
Dynamic simulation of a micro-Trigeneration system serving an Italian multi-family house: Energy, environmental and economic analyses
No full textThis work examines the operation of a residential building-integrated micro-Trigeneration system during the whole year by means of a dynamic simulation software. The investigated system was based on a 6.0 kWel natural gas-fuelled internal combustion engine-based cogeneration unit for heating purposes during the winter and domestic hot water production during the whole year; auxiliary thermal energy was supplied by a natural gas-fired boiler. The cogeneration device, coupled with a combined storage tank, fed a 7.5 kW electric air-cooled water chiller for cooling purposes during the summer. The plant served a multi-family house composed of three floors, located in South Italy and compliant with the thermal transmittances suggested by the Italian Law. The primary energy consumption, the equivalent carbon dioxide emissions and the operating costs of the proposed system were evaluated based on the simulation results according to the Italian scenario and compared with those associated to a conventional system composed of a natural gas-fired boiler coupled with the same air-cooled water electric chiller fed by the electric grid. The performed analyses allowed to assess the energy, environmental and economic suitability of the proposed scheme and its potential benefits in comparison to the reference plant based on separate energy production
Energy, environmental and economic dynamic performance assessment of different micro-cogeneration systems in a residential application
No full textA dynamic performance assessment for a number of micro combined heat and power (MCHP) systems fuelled by natural gas, namely two different internal combustion engines and a reciprocating external combustion Stirling engine, was performed by using a simulation software. The cogeneration units were integrated with an Italian multi-family house compliant with the transmittance values of both walls and windows suggested by the Italian Law. Auxiliary thermal energy was supplied by a natural gas-fired boiler and the heat provided by both the MCHP device and the boiler was accumulated within a combined storage tank. A sensitivity analysis upon varying the hot water storage volume (0.855 m3, 0.738 m3, 0.503 m3) and the set-point temperature (55 °C and 60 °C) of the water within the tank was performed.
Detailed dynamic models, developed within Annex 42 of the International Energy Agency (IEA) and calibrated on the basis of experimental results, were used for carefully predicting the performance of the cogeneration devices.
The simulated performance of the proposed system were compared with those of a reference system composed of a natural gas-fired boiler (for thermal energy production) and the central grid (for electricity production) in order to assess the suitability of the cogeneration device-based system in comparison to the system based on separate energy production.
The comparison was performed from energy, environmental and economic point of views according to the Italian scenario.
The comparison showed that, whatever the MCHP unit is, the proposed system allows for reducing the primary energy consumption (up to 13.4%), the carbon dioxide equivalent emissions (up to 18.9%), as well as the operating costs (up to 20.9%) with respect to the conventional system. The largest savings were obtained with the tank characterized by the lowest volume coupled with the internal combustion engines in the case of 55 °C was used as set-point temperature
Dynamic performance assessment of a building-integrated cogeneration system for an italian residential application
No full text"This paper investigates the energetic, economic and environmental feasibility of a building-integrated micro-cogeneration system for an Italian residential application by means of transient simulations. The. system under investigation was based on a natural gas-fuelled internal combustion engine cogeneration. unit with 6.0 kW as rated nominal electric output. The plant was coupled with a multi-family house composed of three floors located in Naples (south of Italy), compliant with the transmittance values. suggested by the Italian Law.. The analysis was carried out by means of a dynamic whole building simulation software; a detailed. dynamic model was used to simulate the cogeneration device operation under both electric and heat. load-following control strategies.. The simulation results were considered in order to compare the performance of the proposed system with a conventional system based on separate energy production. The simulations results showed that the proposed system makes it possible to reduce the primary energy consumption, the equivalent carbon dioxide emissions as well as the operating costs with respect the reference system. In comparison to the electric load-following operation, the heat load-following control logic was more convenient from both. energy and environmental point of views, but less advantageous from the point of view of operating. costs.
Review of 3D Printing in Architecture: applications, limitations and future developments
No full textAdditive manufacturing has seen a growing interest in the construction industry in the last few years. Along with the possibility of using plastics, cement, clay, mixtures, and so many other materials, the opportunities offered by such technologies mainly rely on the free-shaping of complex geometries and the high customizability of the products. Nowadays, the aim of integrating additive manufacturing processes in the construction stages is to reduce waste materials and reduce the overall environmental impact. This review summarizes the current state-of-art of additive manufacturing, mainly 3D printing, applied to architecture, in current research activities, and actual built projects. The aim is to delineate a comprehensive scenario of its possible applications and current limitations, finally suggesting the opportunities for future investigations
Energy analysis of a building-integrated micro-cogeneration system for a residential application in south italy
No full textThis paper investigates the energetic feasibility of a building-integrated cogeneration system for an Italian residential application by means of transient simulations. The system under investigation was based on a natural gas-fuelled internal combustion engine cogeneration unit with 6.0 kW as rated nominal electric output and 11.7 kW as rated nominal thermal output; auxiliary thermal energy was supplied by a natural gas-fired boiler. The plant was coupled with a multi-family house composed of three floors located in Naples (Italy), compliant with the transmittance values suggested by Italian Law. The analysis was carried out by means of a dynamic whole building simulation software and the simulation results were considered in order to compare the performance of the proposed system with a conventional system composed of a natural gas boiler with an electricity supply from the grid in order to estimate the suitability of the proposed scheme in comparison to the reference system based on separate energy production. The simulations results showed that the proposed system makes it possible to reduce the primary energy consumption
Energy performances of a new greenhouse for the area of Pompeii
No full textThe main purpose of this research is the energy evaluation of a photovoltaic greenhouse with an innovative framework, defined “Serra d’Arte”, designed for the area of Pompeii (south Italy). Using the simulation software ECOTECT, the energy performance was evaluated in terms of photosynthetically active radiation available inside the proposed greenhouse as well as annual electrical energy production. The simulations were performed considering two different covering materials and two types of semi-transparent photovoltaic modules. The results demonstrate that the “Serra d’Arte”, with or without photovoltaic modules, can be used in the considered location for the cultivation of many plant species. The use of photovoltaic modules, in which the area of photovoltaic cells is equal to 50% of the total surface of the module, allows both an acceptable shading of the crops and a suitable annual electrical energy production
Energy performance of a residential building-integrated micro-cogeneration system upon varying thermal load and control logic
No full textThis work investigated the energy performance of a 6.0 kWel micro-cogeneration device integrated with a multi-family house by using a dynamic simulation software. The analyses were performed upon varying the climatic conditions, the control logic of the cogeneration unit, the number of flats composing the building and the target temperature of hot water produced for heating purposes. The simulation data were used to compare the performance of the proposed system with those of a conventional system composed of a natural gas-fired boiler and a power plant mix connected to the electric grid from an energy point of view
Building-integrated trigeneration system: energy, environmental and economic dynamic performance assessment for Italian residential applications
No full textA trigeneration system uses only one source of primary energy, while providing power, heating and cooling simultaneously. This primary source can be represented by either fossil fuels or some appropriate renewable energy sources (biomass, biogas, solar energy, etc.).
In this paper a brief review of micro-trigeneration systems for residential applications was reported. An innovative building-integrated micro-trigeneration system was proposed. This proposed system was based on a natural gas-fueled internal combustion engine micro-cogeneration unit for heating purposes and domestic hot water production. The cogeneration device fed an electric air-cooled vapor compression water chiller for cooling purposes. The micro-trigeneration system was coupled with a multi-family house characterized by transmittance values of the building envelope compliant with those imposed by Italian Law. The considered building is representative of a typical Italian residential application. The feasibility of the proposed trigeneration system was investigated by using the dynamic simulation software TRNSYS in comparison to a traditional supply based on separate energy production. The analyses were performed by varying the climatic conditions and considering buildings located in three different Italian cities (Palermo, Naples and Milan), which are representative of the different climatic regions of Italy.
The primary energy consumption, the equivalent carbon dioxide emissions as well as the operating costs of the proposed system were evaluated based on the simulation results according to the Italian scenario and compared with those associated to a conventional system composed of a natural gas-fired boiler coupled with the same air-cooled water electric chiller fed by the electric grid. The performed analyses allowed to assess the energy, environmental and economic suitability of the proposed scheme as well as its potential benefits in comparison to the reference plant based on separate energy production
Analisi conoscitiva della Casita del Infante: strumento fondamentale per la valorizzazione di architetture in contesti paesaggistici monumentali Cognitive analysis of the Casita del Infante: essential tool for the enhancement of architecture in monumental landscape contexts
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