1,721,171 research outputs found
The buildings climatisation issue in the energy master plan of the City of Palermo - Italy
No full textBuilding integrated solar thermal design: assessment of performances of a low cost solar wall in a typical Italian building
Full text linkPresent work deals with the topic of building integration of solar thermal collector (BIST) as a refurbishment measure. Such
equipment, more than its main function as heating generator, plays a specific role as a building component (envelope finishes,
thermal insulation layer, roof cover etc). Consequently, from a heat transfer point of view, an integrated component affects twice
the global building balance: supporting the thermal plant (i.e. providing heat for final uses) and modifying the wall heat-transfer
pattern (i.e. reducing thermal losses). In turn, the collector performance itself is influenced by the wall structure (back losses
reduction). Present work proposes a method for evaluating the yearly performance of a low cost BIST by means of a Trnsys
model on a reference building. This model arises from previous studies based on experimental validation of a FEM model that
was implemented in order to describe the collector-wall system efficiency
A method for the experimental comparison of two heating and cooling radiant systems in different climatic conditions
No full textSustainable development in urban transport: feasibility study for a plant to produce and store hydrogen from wind energy in the urban transport in western sicily
No full textA theoretical study on the performance of some PV-thermal system configuration
No full textThe paper deals with hybrid Photovoltaic/Thermal (PV/Th) solar collectors with forced air circulation. Eighteen system configurations, each one combining different PV modules “densities” with different air velocities and different thickness of the air gap, are presented and analysed. Electric and thermal performances of the collector are evaluated by means of a simulation model allowing to predict the effective efficiency of the PV cells (as a function of the temperature) together with the amount of heat removed by the air and the temperature of outlet air.
An assessment of the overall energy performances has been undertaken, in terms of saved primary energy, by means of a comparison among the hybrid system and the alternative conventional technologies. The analysis of time series of delivered electric and thermal energies, together with the outlet air temperature values, referred to twelve average monthly design days of Rome location, allowed to assess the effectiveness of the system, related to some possible utilisation of the heat, and to select the best configurations according to different demand requirements
Control systems for indoor lighting and computer simulation: analysis and comparison between software packages capabilities and results on a real case study
No full textIn the last years, computer capabilities have evolved rapidly and also the way to simulate building physics phenomena is changed and more developed. Each simulation software is developed with a less or more similar aim, using different algorithms and models and being used by people with different profile: specialist, architects, engineers, installers, etc. This paper deals with the analysis of capability of some of the most utilised software used to predict indoor lighting, including natural daylight contribution and assessment of energy consumption and savings related to specific design options. Furthermore, two of the analysed software have been tested simulating a case studying. Results show that data calculated by different programs can be very dissimilar. Moreover, consumption calculated using the same software (i.e. Dialux), but using methods proposed by two different technical standards can be very different. It obviously means that while approaching an energy study of a lighting set up, it is necessary to do an accurate selection of the tools to be used, and it is necessary, as well in this case, to analyse critically the results
Mapping the "energy rehabilitation demand" of building as a tool for urban scale strategies. The case of Palermo (Italy)"
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