3,511 research outputs found
Experimental tests about the cooling/freezing of the molten salts in the receiver tubes of a solar power plant with parabolic trough
No full textIn 2003 ENEA realized the PCS experimental Facility at Casaccia Research Centre (Rome, Italy), in order to test in real operating conditions the components of a parabolic trough solar plant, and to evaluate the technical feasibility of using the solar molten salts mixture (60% NaNO3, 40% KNO3, melting point 220÷240°C) in such a type of plant. ENEA also had the need to assess the behaviour of the solar receiver tubes during abnormal operating situations (wrong operation, pump block, power failure, etc.), when a block of the circulation of the molten salts may occur and cause the cooling or, worse, the freezing of the salts mixture inside the pipes. Some experimental tests have been performed, aimed to examine what happens in such a cases. In fact, without quick maneuvers to restart the circulation of the molten salts or to readily empty the receiver tubes, the molten salts contained in them may cool down to temperatures near/below the solidification. In this report are shown the results of the experimental tests carried out on the receiver tubes of the PCS Facility by cooling the process fluid down to temperatures near or below its freezing point. The tests show that the solidification of the salts does not damage the components of the plant but it is manageable and reversible, provided you apply the correct procedures. © 2017 Author(s)
Analysis of a helical coil once-through molten salt steam generator: Experimental results and heat transfer evaluation
No full textA molten salt helical coil steam generator is an alternative to kettle- or drum-type evaporators which are currently used in commercial-scale solar thermal power plants. A 300 kW prototype was tested during the OPTS project at ENEA. The experimental results presented in this paper have been used to validate a detailed heat transfer analysis of the whole system. The heat transfer analysis deals with the study of both the overall heat transfer coefficient and the shell-side heat transfer coefficient. Due to the specific features of this type of system, no correlations were available in the literature. A new numerical model to predict the performance of large-scale systems is also presented. © 2016 Author(s)
Catholic Comments Podcast.
No full textAuthor Tim Rinaldi discusses his mission work in Honduras and how it changed his life and perspective
Superamento degli ostacoli anatomici in chirurgia implantare, English.
No full text"Superamento degli ostacoli anatomici in chirurgia implantare by Rinaldi M, Mottloa A."--Title page verso.dental bookfair2016Includes bibliographical references and index.xiv, 552 pages
Review Journal (Rinaldi Virgas W / 130216383)
No full textpemberdayaan sumber daya manusia di Indonesia dalam menghadapi revolusi industri 4.
Neutron Scattering Techniques in Mineral and Earth Sciences (Guest editor: Romano Rinaldi)
No full textThe child as citizen: holder of rights and competent. The Reggio Emilia educational experience
No full textThe Convention on the Rights of the Child, approved by the General Assembly of the United Nations on 20 November 1989, states in Article 2 that “States Parties shall respect and ensure the rights set forth in the present Convention to each child within their jurisdiction without discrimination of any kind, irrespective of the child's or his or her parent's or legal guardian's race, colour, sex, language, religion, political or other opinion, national, ethnic or social origin, property, disability, birth or other status.” Therefore, the child becomes a citizen from birth and is competent to learn from birth. Competent in learning, asking questions, seeking answers, and generating a culture of their own. By affirming the right to be recognised as a citizen of the present, competent, culture-generating, we affirm the strength and extraordinary potential of the child and their right to express it. Infant-toddler centres and preschools are excellent educational places, where to build the paradigm of care and community for the child as citizen. Not all-encompassing places for education, but essential. They help to process, rework and update childhood data, to define childhood and to be defined by them and to define societies. It is not just the care of the child, it is the child’s culture, it is the child’s look at the world, their generative whys. The great cultural and political “revolution” of the last century – never completely accomplished – is making children active protagonists, leaving them their autonomy, considering them as holders of rights and culture. But now we know that society needs its childhood, [email protected] Reggio Children – Centro Loris Malaguzzi (The Reggio Children – Loris Malaguzzi Centre Foundation)Acemoglu D., Robinson J. 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An Innovative Concept of a Thermal Energy Storage System Based on a Single Tank Configuration Using Stratifying Molten Salts as both Heat Storage Medium and Heat Transfer Fluid, and with an Integrated Steam Generator
No full textAbstractThe proposed innovative thermal energy storage system is based on a single tank containing a mixture of nitrate salts (60% NaNO3 and 40% KNO3 in weight; this mixture gradually changes from solid to liquid in the temperature range between about 220°C and 240°C, becoming completely melted above this temperature), with an integrated steam generator directly contained inside it. The system is operated exploiting the thermal stratification of the salts mixture in the temperature range between 550°C (hot temperature) and 290°C (cold temperature). The experimental work conducted at ENEA has revealed that the thermal stratification of the molten salts mixture can be maintained quite constant for several hours and the presence of the integrated steam generator actively guarantees and maintains the stratification during the operation time, avoiding mixing of the stratified layers. The single-tank system with stratification of the molten salts and an integrated steam generator is an important improvement in terms of efficiency, reliability and cost reduction, with respect to the two-tank thermal energy storage system. This report has the aim of giving an overview of this new technology but, given the fact that the experimental activities are still ongoing, the description of the system remains at a qualitative level. The complete set of experimental results will be presented in the future when the Projects that are framework of this research will have been completed
Least inventory control of multi-storage systems with non-stochastic unknown inputs
No full textWe consider multi-inventory production systems with control and state constraints dealing with unknown demand or supply levels. Unlike most articles in the literature concerning this class of systems, we cope with uncertainties in an “unknown-but-bounded” fashion, in the sense that each unknown quantity may take any value in an assigned interval. For these situations, we perform a worst-case analysis. We show that a “smallest worst-case inventory level” exists, and it is associated to a steady state control strategy. We then consider the problem of driving the inventory levels to their smallest worst-case values. For this problem, we first give necessary and sufficient conditions, then we show that convergence occurs in a finite number of steps, and we give an upper bound for such a number. This is a conference version of the paper in which the proofs, details and references are include
An exact algorithm for the solution of a network design problem
No full textA network design problem which arises in the distribution of a public utility provided by several competitive suppliers is studied. The problem addressed is that of determining minimum-cost (generalized) arc capacities in order to accommodate any demand between given source-sink pairs of nodes, where demands are assumed to fall within predetermined ranges. Feasible flows are initially considered as simply bounded by the usual arc capacity constraints. Then, more general linear constraints are introduced which may limit the weighted sum of the flows on some subsets of arcs. An exact cutting plane algorithm is presented for solving both of the above cases and some computational results are reported
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