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Bolzano, Italy

Brandoni C.,University of Ulster | Renzi M.,Libera University Bolzano
Applied Thermal Engineering | Year: 2015

The present paper addresses the importance of optimal sizing hybrid microgeneration systems for dwelling applications. Indeed, the parameters, the constraints and the criteria which must be considered in the sizing phase are several: i) energy prices, ii) ambient conditions, iii) energy demand, iv) units' characteristics, v) electricity grid constraints. The hybrid renewable system under analysis is made up of an electrical solar device and a micro-Combined Heat and Power, micro-CHP unit coupled to a cooling device. In addition to traditional PhotoVoltaic, PV, technology the work considers a High Concentration PhotoVoltaic, HCPV, device, with the aim of understanding its potential application in the countries of the Mediterranean. Results point out the importance of optimal sizing hybrid renewable energy systems, in particular the micro-CHP unit, in order to maximize the economic and the energy savings with respect to conventional generation. Furthermore results point out the critical nature of electricity grid constraints, which can halve the achievable energy savings. © 2014 Elsevier Ltd. All rights reserved. Source


Comodi G.,Marche Polytechnic University | Cioccolanti L.,Marche Polytechnic University | Renzi M.,Libera University Bolzano
Energy | Year: 2014

This study investigates the potential of energy efficiency, renewables, and micro-cogeneration to reduce household consumption in a medium Italian town and analyses the scope for municipal local policies. The study also investigates the effects of tourist flows on town's energy consumption by modelling energy scenarios for permanent and summer homes. Two long-term energy scenarios (to 2030) were modelled using the MarkAL-TIMES generator model: BAU (business as usual), which is the reference scenario, and EHS (exemplary household sector), which involves targets of penetration for renewables and micro-cogeneration. The analysis demonstrated the critical role of end-use energy efficiency in curbing residential consumption. Cogeneration and renewables (PV (photovoltaic) and solar thermal panels) were proven to be valuable solutions to reduce the energetic and environmental burden of the household sector (-20% in 2030). Because most of household energy demand is ascribable to space-heating or hot water production, this study finds that micro-CHP technologies with lower power-to-heat ratios (mainly, Stirling engines and microturbines) show a higher diffusion, as do solar thermal devices. The spread of micro-cogeneration implies a global reduction of primary energy but involves the internalisation of the primary energy, and consequently CO2 emissions, previously consumed in a centralised power plant within the municipality boundaries. © 2014 Elsevier Ltd. Source


Renzi M.,Libera University Bolzano | Brandoni C.,University of Ulster
Applied Thermal Engineering | Year: 2014

Fuelling micro-combined heat and power (micro-CHP) devices using renewable sources, such as biogas, can enhance the energy and environmental benefits associated with such devices. This paper presents a solution for increasing the electric efficiency of biogas-fed Stirling co-generators by recuperating the energy content of the combustion flue gas. When economically and energetically convenient for micro-CHP operation, the exhausts can be used to pre-heat fresh combustion air. It was assessed that, due to the introduction of a spiral gas-gas heat exchanger, whose main design parameters were identified, the electric efficiency of the Stirling unit can be raised to up to 22.5%. To determine the advantages of applying the system analysed over a traditional Stirling device, a specific algorithm for the optimal management of the micro-CHP unit was built and applied to a residential case study. The results demonstrate that the extra cost of the high-efficiency recuperator can be easily recovered in approximately two years of system operation, providing an additional advantage over a standard Stirling device in terms of primary energy consumption and an approximately 6% increase in economic savings. © 2014 Elsevier Ltd. All rights reserved. Source


Caresana F.,Marche Polytechnic University | Pelagalli L.,Marche Polytechnic University | Comodi G.,Marche Polytechnic University | Renzi M.,Libera University Bolzano
Applied Energy | Year: 2014

Microturbines (MGTs) are a relatively new technology that is currently attracting a lot of interest in the distributed generation market. Particularly interesting is their use as backup source for integrating photovoltaic panels or/and wind turbines in hybrid systems. In this case the sensitivity to ambient conditions of the MGT adds to that of the renewables and the knowledge of the effects of ambient conditions on its performance becomes a key subject both for the sizing of the energy system and for its optimal dynamic control.Although the dependence of medium/large gas turbines performance on atmospheric conditions is well known and documented in literature, there are very limited reports available on MGTs and they regard only global parameters. The paper aims at filling this lack of information by analyzing the ambient temperature effect on the global performance of an MGT in cogeneration arrangement and by entering in detail into its machines' behavior. A simulation code, tuned on experimental data, is used for this purpose.Starting from the nominal ISO conditions, electrical power output is shown to decrease with ambient temperature at a rate of about 1.22%/°C, due to a reduction of both air density and volumetric flow. Meanwhile, thermal to electrical power ratio increases at a rate of about 1.30%/°C. As temperature increases compressor delivers less air at a lower pressure, and the turbine expansion ratio and mass flow reduce accordingly. With the in-use control system the turbine inlet temperature reduces at a rate of 0.07%/°C with respect to its ISO condition value. © 2014 Elsevier Ltd. Source


Grant
Agency: Cordis | Branch: H2020 | Program: CSA | Phase: MSCA-NIGHT-2014 | Award Amount: 189.03K | Year: 2014

In the alpine province of South Tyrol (500,000 inhabitants) science and innovation do not have a long tradition, but as everywhere they are crucial for the future development of the economy. LUNA (LUnga Notte della ricerca Lange NAcht der Forschung), which takes place every other year, is a great opportunity for the population to get in touch with scientists, to learn about research projects in the region and to have fun with scientific themes. The main organisers of LUNA are committed to creating a tradition for science and innovation in South Tyrol, organising different science events at planned intervals: LUNA every second year, science cafs every summer, activities for schools throughout the school year, etc. LUNA will be organised for the fourth time on 26 September in Bolzano/Bozen, the principal town of South Tyrol with 100,000 inhabitants. Once again a consortium comprising the European Academy of Bolzano/Bozen, the Free University of Bolzano /Bozen and Techno Innovation South Tyrol will be the main organisers with their headquarters used as the major venues. A further five to seven additional partners (businesses, museums and other research institutions) are expected to open their doors as well. The Night will thus transform Bolzano into an exciting science park, where children and adults will be able to have fun with science at up to ten different venues connected via a free shuttle service. An intensive Awareness Campaign will ensure that about 300,000 people will be aware of LUNA. We expect around 14,000 16,000 visitors. From 5 pm until midnight we will show our guests, how Science makes you fly which is the main theme for this years event. People will be given the opportunity to participate in many different interactive presentations, games, quizzes, experiments and science performances. They will have the chance to talk, enjoy themselves, eat, drink and even dance with experts and scientists from many different discipline

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