30,337 research outputs found
Dynamic simulation of polygeneration systems for buildings
No full textThis thesis aims at investigating the polygeneration systems for buildings by dynamic simulation models. In particular, different polygeneration systems, supplied both by the solar renewable energy source and natural gas, were examined from the energy, exergy, economic and environmental point of view
12th International Conference on Smart Cities and Green ICT Systems (SMARTGREENS 2023), Prague. Czech Republic,
No full text3rd International Conference “Sustainable Energy and Environmental Development” (SEED). Krakow.
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PRIMA SEGNALAZIONE EUROPEA DI PARASSITIZZAZIONE DI CACYREUS MARSHALLI (BUTLER) DA PARTE DI UN TACHINIDE INDIGENO
No full textCacyreus marshalli (Lep.: Lycaenidae) specie originaria del Sudafrica, si sviluppa principalmente a spese di piante appartenenti ai generi Pelargonium e Geranium. A partire dalle Isole Baleari, dove è stato accidentalmente introdotto negli anni '80, il licenide ha colonizzato diversi paesi dell'Europa mediterranea, Italia inclusa, divenendo il fitofago più dannoso ai gerani coltivati. In Europa la prima segnalazione di un insetto antagonista di C. marshalli ha riguardato Trichogramma evanescens Westwood (Hym.: Trichogrammatidae), sfarfallato da uova raccolte a Cabrils e Lleida in Spagna (Sarto & Gabarra, Catalunya Rur. Agr., 1998, 46: 24-26); nel 2005 a Nocera Inferiore (Campania) sono state reperite invece larve di imenotteri parassitoidi endolarvali, nessuna delle quali ha completato lo sviluppo e pertanto rimaste indeterminate [Pignataro & Vicidomini, Natur. Campano (Mus. Nat. C. Monforte), 2005, n.2. 2006]. Viene quì segnalato il primo caso in Europa di parassitizzazione di C. marshalli ad opera del dittero tachinidae indigeno Aplomya confinis (Fallen), parassitoide solitario endolarvale a uova macrotipiche, noto soprattutto come antagonista di Lycaenidae (Baumgarten & Fiedler, Zool. Anz., 1997, 236: 167-180). Un singolo esemplare è stato ottenuto nell'ottobre 2006 da una larva di C. marshalli, raccolta nel settembre dello stesso anno su una pianta di Pelargonium sp. in un terreno incolto a Scafati, e allevata a 25°C, 75% (+ 10%) UR e fotoperiodo 14 : 10 luce/buio. A. confinis, unica specie del genere Aplomya in Italia, è distribuita su tutto il territorio nazionale (http://www.faunaitalia.it/). La parassitizzazione di un licenide esotico da parte del tachinide può dipendere sia dalla sua elevata polifagia che dal pattern morfo-cromatico di alcuni suoi ospiti abituali, quali Lycaena phlaeas (L.) e Eumedonia eumenodon (Esper) (quest'ultima si sviluppa su piante di Geranium: http://www.leps.it/), che hanno larve simili a quella di C. mashalli. Gli stimoli visivi infatti sono importanti per il riconoscimento dell'ospite nei Tachinidae che ovidepongono sul o nel corpo della vittima (Mellini, Boll. Ist. Ent. Grandi Univ. Bologna, 1990, 45: 1-38). Qualora a questa prima segnalazione ne seguissero altre, potrebbero aprirsi interessanti prospettive ai fini del controllo di C. marshalli
Renewable Energy Systems 2020
No full textIn the last few years, several states have experienced a significant growth of the global energy demand [...
Maria Bersani
No full textLa voce illustra la biografia e l'apporto letterario dato da Maria Bersani alla letteratura per l'infanziaThe headword explains the biography and the contribution of the author Maria Bersani to the children's literatur
Design and optimization of a novel solar cooling system for combined cycle power plants
No full textThis paper presents the design of a novel Solar Assisted Combined Cycle power plant. The system includes a solar loop equipped with a double stage absorption chiller driven by high-temperature high-vacuum non-concentrating flat-plate solar thermal collectors. The solar loop is coupled to a single-pressure Combined Cycle power plant. The cooling energy produced by the absorption chiller is used to cool gas turbine inlet air, aiming at enhancing system efficiency and electrical capacity. This Solar Assisted Combined Cycle arrangement is analysed through a dynamic system simulation and a thermoeconomic analysis is performed aiming at determining the optimal set of design and operating parameters. This original configuration was numerically analysed in TRNSYS, developing a suitable dynamic simulation model to predict system performances. Suitable dynamic models are implemented for all the cothe mponents included in the system. The simulation also includes a thermoeconomic model which accurately evaluates system capital and operating costs as a function of design and operating parameters. The results show that a very high thermal efficiency of solar collectors, on average equal to 34%, is achieved. Results from the economic point of view were also satisfactory. In fact, the pay back period was about 8 years in the best case
A novel approach for the energy and economic analysis of heat metering for residential buildings: dynamic simulation and thermoeconomic optimization
No full textA Novel Prototype of a Small-Scale Solar Power Plant: Dynamic Simulation and Thermoeconomic Analysis
No full textThe paper presents an innovative prototype of a solar power plant, purposely designed for small-scale applications such as residential and/or small commercial buildings. The system consists of 10 kWe Organic Rankine Cycle (ORC) plant and innovative solar thermal collectors. In particular, 235 m2 of flat-plate evacuated solar collectors are designed to heat diathermic oil up to 180°C. A variable volume pump is managed by a feedback controller in order to obtain the desired outlet set point temperature for the different weather/load conditions. The hot diathermic oil passes through a storage tank, which is adopted with the purpose to reduce the oscillations due to the solar radiation variability. By means of the tank, a better exploitation of solar energy is also achieved, reducing the time-shift between production and demand. For achieving a constant ORC inlet temperature the tank outlet hot diathermic oil passes through a gas-fired burner, which provides auxiliary additional thermal energy. Therefore, the ORC simultaneously produces electrical energy and low temperature (45°C) cogeneration heat. This solar power plant was dynamically simulated in TRNSYS environment. The simulation tool includes a novel model in order to simulate the dynamic thermal behavior of solar collectors, whereas the ORC dynamic was simulated by means of a performance data map provided by the manufacturer. The model also includes a tool for the calculation of energy and economic parameters and the evaluation of the optimum thermoeconomic configuration. Results indicated that the best pay-back period is obtained for a solar field area of about 200 m2 and a solar fraction of about 75%. Nevertheless, the system may be competitive from the economic point of view only if incentives can be made available, as commonly occurs for renewable applications, i.e., solar systems. This prototypal system aims to become a potential solar power system for small residential and/or commercial buildings. The presented study will be suitably used as a basis for the installation of a working prototype in located Naples, Italy
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