1,720,976 research outputs found
Energetic performance of a precast concrete panel: first results of a numerical and in situ analysis
No full textConcrete precast panels, often used in industrial building, are currently used, in Italy and worldwide, also for wider application (e.g. commercial building, warehouse,..) and so this claims for their better energetic and thermal performances to ensure energy savings and well-being, achieving the function of separating the controlled indoor environment from the uncontrolled outdoor environment.
Starting from an actual panel, this paper presents the first results of a numerical and in-situ (experimental) analysis performed to improve its thermal and energetic performances in an industrial building application. The aims of the research, starting from the on-site data acquisition, is the assessment of actual performances of both the panel and the industrial building envelope, and the integration of these data with some “state of art” commercial software that will be able to predict the thermo-hygrometric and energetic behaviour of the panel itself and whole building
Environmental and energetic design of a precast concrete panel for commercial and industrial building
No full textOn the basis of Directive 2002/91/EC the energy savings in the buildings sector (residential, commercial, industrial, etc...) cannot be postponed; about 40% of the total energy consumption takes place in buildings, which is the highest percentage among energy consumers. The building design have to take into account all issues related to energy performance, and in special way, all those related to building energy use for heating, ventilation, cooling, lighting. In this framework are of particular interest, commercial and industrial buildings fo which the building-related energy use is often the dominant component of total energy use.
Concrete precast panels, firstly used for industrial building cladding, are currently employed, in Italy and worldwide, also in the abovementioned sectors (e.g. commercial building, warehouse, office,..) and this claim for a better energetic and thermal performances in term of thermal insulation and thermal inertia to ensure energy
savings.
In this paper, based on actual panel used in an industrial building application, that is from the real conditions of operation, is presented a methodology that from the energy point of view and heat transfer point of view, has lead to the improvement of the actual panel.
External conditions (temperature, humidity, wind direction, solar radiation, illumination) and internal conditions (temperature, humidity, illumination) have been collected and then compared to software simulation esults (ECOTECT). This leads to the effective information on main parameters that are influencing actual panel and so they can define requirements necessary to improve energetic performance in term of thermophysical
performances (thermal resistance, lower water vapour diffusivity, optimization of thermal lag and enhancement of energy savings)
Thermal and energetic analysis of a precast panel for industrial buildings
No full textOn the basis of Directive 2002/91/EC the energy savings in the buildings sector (residential, commercial, industrial, etc...) cannot be postponed; about 40% of the total energy
consumption takes place in buildings, which is the highest percentage among energy
consumers. The building design have to take into account all issues related to energy
performance, and in special way, all those related to building energy use for heating,
ventilation, cooling, lighting.
Concrete precast panels, often used in industrial building, are currently used, in Italy and
worldwide, also for wider application (e.g. commercial building, warehouse,..) and so this
claims for their better energetic and thermal performances to ensure energy savings and
well-being, achieving the function of separating the controlled indoor environment from the
uncontrolled outdoor environment.
This paper present the results of a numerical (using 3-D finite difference) and in-situ
(experimental) analysis of a lightweight and thermal barrier panel designed to improve
thermal and energetic performances respect to an actual lightweight panel employed in an industrial building located in the southern part of Italy
In situ analysis of energetic performance for a precast concrete panel in an industrial building
No full textConcrete precast panels, often used in industrial building, are currently used, in Italy and worldwide, also for application in commercial building sector and so this claims for their better energetic and thermal performances to ensure energy savings and well-being, achieving the function of separating the controlled indoor environment from the uncontrolled outdoor environment.
Starting from an actual panel used in an industrial building application, that is from the real conditions of operation, it was set-up an experimental station of measure in which the main parameters, both from the energy point of view that of the heat transfer, were monitored and acquired during the winter period; external conditions (temperature, humidity, solar radiation), panel parameters (heat flux, surface temperatures) and internal conditions (temperature, humidity) has been collected and then analysed
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
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”
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
Analysis of Small Scale Decentralized Cogeneration in Southern Italy
No full textDuring the last decade, small-scale combined heat and power systems have become a viable alternative to conventional power supply and boiler-based heating system in many types of applications. In order to evaluate the energetic, environmental and
economic feasibility of domestic cogeneration in Italy, an analysis of energy demand profiles of a 120 m2 house has been performed and a simulation, based on a spreadsheet, of a microcogeneration ystem based on a 6 kWel gas fired internal
combustion engine has been developed. In order to identify the right application for cogeneration in the domestic sector, an energetic, economic and environmental analysis has been performed varying some parameters, such as number of dwellings,
operating mode and reference systems. The introduction of microcogeneration system allows primary energy savings ranging between 6% and 13%, avoided emissions of CO2 between 8 and 18% and a payback-period lower than 5 years starting from 8 dwellings
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