1,721,001 research outputs found
Generazione distribuita per applicazioni di piccola taglia
No full textNegli ultimi anni un considerevole sforzo di R&D è stato indirizzato all’analisi della transizione dai grossi sistemi di “produzione” energetica centralizzata a quelli decentralizzati, Distributed Generation. Per raggiungere obiettivi di risparmio di energia primaria e di contenimento di emissioni climalteranti, rispetto alla tradizionale “produzione” separata, devono essere presi in esame sistemi di conversione complessi in grado di soddisfare “in situ” richieste energetiche differenziate (cogenerazione, poligenerazione e trigenerazione).
Le potenzialità di contenimento delle emissioni e dei consumi energetici di dispositivi di cogenerazione di piccola taglia vanno analizzate con riferimento a reali condizioni di esercizio che contemplino elementi fortemente determinanti quali le prestazioni a carichi parziali e gli effettivi diagrammi dei carichi frigo-termo-elettrici dell’utenza considerata. In particolare inapplicazioni di piccola taglia, quali quelle residenziali e del piccolo commerciale, le richieste energetiche risultano molto aleatorie e caratterizzate da corpose fluttuazioni temporali.
In questo lavoro sono state preliminarmente caratterizzati possibili diagrammi di carico per utenze domestiche del sud Italia disaggregando le richieste elettriche e termiche (riscaldamento, acqua calda sanitaria e refrigerazione) dell’utenza.
L’analisi delle 3-E (Energetic, Economic e Environmental) ha permesso di confrontare il sistema proposto, basato su un microcogeneratore, mosso da un motore alternativo a combustione interna alimentato a gas naturale, con quello tradizionale di riferimento, basato sulla “produzione” separata
Sviluppo di un ambiente di monitoraggio, controllo e gestione remota di una rete di micro_poligeneratori distribuiti
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On site analysis of a gas driver microcogenerator incorporating heat pump
No full textThis article reports the energetic analysis of a natural gas fuelled micro-cogenerationsystem for applications in residential and small commercial (MCHP) sector combinedwith an electric heat pump (EHP) obtained by experimental tests made in a simulationstation appositely equipped.After reported a brief description of the experimental simulation plant used to valueMCHP/EHP system performances and the components main characteristics, there arefound the advantages of this solution and, finally, is discussed energetic analysis made onthe performances of the system as a whole and on the main components.Particularly there have been simulated two functioning modes in stationaryMCHP/EHP system conditions: the first one is able to simulate a winter functioning withco-production of electric and thermal energy, the second one a summer functioning withco-production of electric, thermal and cooling energy (trigeneration)
Gas driven microcogenerator incorporating heat pump for residential application
No full textA natural gas-fired micro-cogenerator (MCHP) based on a reciprocating internal combustion engine that drives an electric heat pump (EHP), MCHP/EHP, has been analyzed. It allows a high degree of flexibility in terms of operating conditions, due to the possibility to use the two devices separately supplying electric and thermal (heating and cooling) energy (CCHT, Combined Cooling Heating and Power). The MCHP/EHP is a gas cooling technology that can contribute to ptimize the natural gas and electricity
consumptions in those countries where the HVAC systems are widespread. In
particular, our interest was focused on micro-cogenerators (electric power ≤ 15 kW) at the moment available on the market, based on reciprocating internal combustion engine, that could have a great diffusion in the near future for domestic and light commercial applications. Starting by the results of an ntense experimental activity an exergetic, economic and environmental analysis has been carried out to compare the
proposed MCHP/EHP system to the conventional one based on separate “production”
Microcogeneration and polygeneration for building in mild climate
No full textThis paper deals with two Micro Combined Cooling, Heating and Power systems based on different technologies: Electric Heat Pump, EHP, and Desiccant Wheel, DW.
In a test facility an intense experimental analysis has been carried out on a EHP driven by a Micro Cogenerator, MCHP: it can provide 20% savings in primary energy and a
eduction of equivalent CO2 equal to 25% compared to separate production. A similar MCHP/EHP system has been installed in an office building located in the South of Italy in order to evaluate the “on site” performances.
Furthermore an HVAC system based on a desiccant wheel coupled to a cogenerator, MCHP/HVAC-DW, has been analyzed too: it consists of a microcogenerator that supplies electricity to an air cooled water chiller and thermal energy to regenerate a desiccant wheel integrated in an air-handling unit.
These applications are referred to mild climate locations in South Italy, with the aim to evaluate their potential employment in building conditioning systems.
Test facilities, with their measurement systems, designed and built to evaluate erformances in actual operating condition are described too
Experimental results of a micro-trigeneration installation
No full text"Micro-cogeneration is a well-established technology and its deployment has been considered by the European Community as one of the most effective measure to save primary energy and to reduce greenhouse gas emissions. Micro-trigeneration systems are also gaining an increasing interest thanks to the availability of small thermally driven cooling systems and the increasing demand for space cooling during the warm season.. . At the Built Environment Control Laboratory of Seconda Università degli Studi di Napoli, a micro-cogenerator based on natural gas fuelled reciprocating internal combustion engine that can be coupled with a thermal-chemical absorption system has been set-up in order to experimentally investigate the on-site performances of both micro-cogeneration system and micro-trigeneration system under real operating conditions. This paper deals with the description of experimental plant and the results of first experimental tests. The analysis of the measured data is carried out from an energy, economic and environmental point of view, by comparing the performances of the proposed system with those of the conventional system and the best available technology.
3-E analysis of a heat pump driven by a micro-cogenerator
No full textThe cogeneration, or the combined production of electric (and/or mechanical) and thermal energy, is a well established technology, which has important environmental benefits and it has been noted by the European Community as one of the first elements to save primary energy, to avoid network losses and to reduce the greenhouse gas emissions. In particular, the study will be focused on the micro-cogeneration process with micro-combined heat and power system, or MCHP (electric power output ≤ 15 kW), which represents a valid and interesting application of this technology applicable, above all, to residential and light commercial users. This paper presents the Energy, Economic and Environmental (3-E) analysis of a natural gas-fired MCHP in combination with an electric heat pump (EHP). The 3-E analysis of the MCHP/EHP begins with the results of a detailed experimental activity developed in a test facility [1] for a wide range of conditions. Two operating conditions were simulated: a heating mode with co-production of electric and thermal energy, and a cooling mode with co-production of electric, thermal and cooling energy (tri-generation). The annual operating performance, also based on the typical features of the Italian market, is also discussed with a simplified approach. Copyright © 2005 by ASME
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