Search results for "Cooling"
showing 10 items of 470 documents
Analisi comparata di sistemi solari per il condizionamento tramite la metodologia LCA
2013
Lo studio mostra un'applicazione della metodologia Life Cycle Assessment finalizzata alla valutazione delle prestazioni energetico-ambientali di due differenti tipologie di sistemi di raffrescamento che utilizzano energia solare per applicazioni nel settore civili d'utenza. In dettaglio, sono analizzati sistemi energetici basati su macchine frigorifere convenzionali connesse a impianti fotovoltaici e sistemi di solar cooling alimentati da fluidi a bassa temperatura. I risultati evidenziano che le prestazioni energetico-ambientali dei sistemi connessi alla rete sono superiori a quelle degli altri sistemi, mentre la produzione dei sistemi di accumulo limita la competitività dei sistemi stand-…
Life Cycle Assessment of solar heating and cooling systems: the tool “ELISA”
2018
Solar heating and cooling (SHC) systems play an important role in the achievement of energy and climate European goals. The benefits of these technologies should be evaluated taking into account their lifecycle energy and environmental impacts, calculated by applying the Life Cycle Assessment (LCA) methodology. The development of a complete LCA can be difficult and time-consuming particularly for no-LCA experts, discouraging them in the inclusion of the lifecycle perspective in their assessments. To overcome this limit, the paper presents “ELISA - Environmental Lifecycle Impacts of Solar Air-conditioning systems”, a user-friendly simplified tool for estimating the lifecycle energy and envir…
A CCHP system fed by low enthalpy sources in Mediterranean area
2018
Climate change and energy consumption increasingly call for a better use of energy sources. Renewable sources are still growing in the power production of many countries, so leading to the reduction of CO2 emissions. Further restrictions will be applied to the use of fossil fuels with a lot of consequences; for example, some German cities are all contemplating bans related to diesel pollution, and on the other hand some of the biggest car producers are planning to stop the diesel engines production in a few years. At the same time, some restrictions are applied also to many refrigerating fluids, in order of limiting the ODP and GWP values. This restriction leads to research new fluids and/o…
LCA of a solar heating and cooling system equipped with a small water–ammonia absorption chiller
2012
The development of renewable energy technologies is a critical tool for reducing climate change and the reliance on fossil fuels. However, renewable energy technologies cannot be considered totally clean because they require energy consumption and have environmental impacts that cannot be neglected during their life cycle. In this paper, the life cycle assessment methodology was applied to assess resource use and other environmental burdens related to the entire life-cycle steps of a solar cooling plant. The investigated system works with an absorption chiller assisted by a solar plant. Two back-up configurations (hot back-up and cold back-up) were examined in two localities: Palermo (south…
Computer model and simulation of a traditional passive cooling ventilation system in a Modern building in Mazara del Vallo (Italy)
2008
Traditional and modern natural ventilation techniques have been integrated in a hybrid system for a retrofitting of public building in the city of Mazara del Vallo (Italy). The hybrid ventilation and air cooling system integrates a wind tower, an indirect evaporative heat exchanger, a ground cooling pipe network and ventilated façade. The first idea was to design a passive cooling system inspired to the typical wind towers of the Middle East, being the area very well ventilated. On the other hand, air humidity in summer is quite high and therefore the effectiveness of indirect evaporative cooling is quite low. For this reason, it was adopted a second passive cooling system consisting in a g…
Caratterizzazione degli edifici non residenziali ad uso scolastico della PA siciliana
2014
La presente relazione finale descrive le ricerche svolte, in seno all’accordo di collaborazione tra l’ENEA e il Dipartimento dell’Energia, ingegneria dell’Informazione e modelli Matematici (DEIM) dell’Università di Palermo. L’accordo di collaborazione è titolato “Caratterizzazione degli edifici scolastici nella Regione Sicilia”. La relazione è suddivisa in due sezioni: la prima, Parte A, illustra lo studio condotto per la caratterizzazione degli edifici non residenziali ad uso scolastico della PA siciliana; la seconda, Parte B, descrive lo stato dell’arte del “Ventilative Cooling” con riferimento particolare ad alcuni casi-studio reali, nel contesto della partecipazione del DEIM alle attivi…
Data fusion analysis applied to different climate change models: an application to the energy consumptions of a building office
2018
The paper aims to achieve the modelling of climate change effects on heating and cooling in the building sector, through the use of the available Intergovernmental Panel on Climate Change forecasted data. Data from several different climate models will be fused with regards to mean air temperature, wind speed and horizontal solar radiation. Several climatic models data were analyzed ranging from January 2006 to December 2100. Rather than considering each model in isolation, we propose a data fusion approach for providing a robust combined model for morphing an existing weather data file. The final aim is simulating future energy use for heating and cooling of a reference building as a conse…
Solar cooling: study on the technical-economic feasibility of a plant in a hotel.
2009
Solar air conditioning allows more energy savings than air conventional conditioning plants. Just like the thermal solar systems for heat production destined to large consumers, solar air conditioning represents a technology that turns out to be economically more favorable. Its employment for the summer air conditioning of buildings represents today an ulterior and very interesting field of application. This article shows the results of a study on the technical-economic feasibility of a solar cooling plant realized in a hotel in South Italy. Just like the air conditioning load produced by electric power, hot water produced by thermal solar plants has a periodic character which, in both case…
NEW DEC OPEN CYCLE FOR AIR CONDITIONING BASED ON FIXED COOLED ADSORPTION BEDS AND WET HEAT EXCHANGERS
2013
In this work, a new solar Desiccant Evaporative Cooling (DEC) concept is presented. In the proposed system, two fixed packed desiccant beds of silica gel, operating in a batch process, are used as an alternative solution to the common adsorption rotor for dehumidifying outside air. As well known, adsorption heat due to water condensation considerably reduces the dehumidification capacity of the desiccant material, causing inefficiencies in performance. The aim of the work is to overcome the mentioned intrinsic thermodynamic limit of the adsorption rotor technology. The proposed core component is a fin and tube heat exchanger, commonly used in several air conditioning applications, wherein t…
The Role of Natural Ventilative Cooling in NZE Temporary and Emergency Shelters Design: a Mediterranean Case Study
2016
The paper presents a case-study of a pre-fabricated housing module built in Messina (Sicily, Italy) and the assessment of its energy performances under the net zero energy perspective. The potential of ventilative natural cooling application in the case-study is also investigated. Some particular features of the building - the modularity, the prefabrication, the rapidity of assembly, the possibility of being built on disconnected soils and the absence of maintenance - identify an effective use as a temporary housing solution for e.g. workers in proximity of an isolated working place or in emergency situations such as earthquakes and natural disasters. Monitoring studies were performed durin…