The ever-increasing attention to environmental pollution and the greenhouse effect, together with need reduce harmful emissions into atmosphere, has led a general enforcement of stricter legislation worldwide which imposes adoption more efficient sustainable solutions in many different fields. use traditional fossil fuels must be reduced, favoring both renewable energy sources alternative fuels. This paper outlines procedure for calculating advantages using liquified natural gas (LNG)...

Within the framework of European Combined Efficient Large Scale Integrated Urban Systems (CELSIUS) project, Genoa demonstrator involves insertion a turbo expander (TE) to substitute standard throttling process in natural gas expansion station. In this way, currently wasted mechanical energy will be recovered, while an internal combustion combined heat and power (CHP) unit used meet heating requirements before serve small district network (DHN). Both TE CHP are capable delivering electric...

This paper deals with the dynamic modeling of a typical single-zone building. It describes development model for thermal transient analysis and its application to simplified test case considering solar irradiation internal radiation. The behavior indoor air temperature has been investigated by means lumped approach using state-space representation developed in MATLAB/Simulink. A set daily profiles, which are representative Mediterranean climatic condition, on few different winter days, used...

Hydrogen production is a topical issue in an energy scenario where decarbonization priority, especially with reference to the transport sector that has great weight on global emissions. Starting from this consideration, GIF (Generation-IV International Forum) investigated possibility produce hydrogen by nuclear energy. The “classic” strategy based use of as source for electrolysis; but medium-long term, more sustainable and smart approach could be founded thermochemical processes (e.g., I-S)...

Liquefied Natural Gas (LNG) is a crucial resource to reduce the environmental impact of fossil-fueled vehicles, especially with regards maritime transport, where LNG increasingly used for ship bunkering. The present paper gives insights on how installation tanks inside harbors can be capitalized increase energy efficiency port cities and GHG emissions. To this purpose, novel integrated system introduced. Boil Off (BOG) from exploited in combined plant, heat power are produced by regenerated...

Increasing energy efficiency by the smart recovery of waste is scope CELSIUS Project (Combined Efficient Large Scale Integrated Urban Systems). The consortium includes a world-leading partnership outstanding research, innovation and implementation organizations, gather competence excellence from five European cities with complementary baseline positions regarding sustainable use energy: Cologne, Genoa, Gothenburg, London, Rotterdam. Lasting four-years coordinated City project faces an...

The authors present a dynamic simulation of the thermal behavior multilayer plane wall, integrated with Phase Change Materials (PCMs), exposed to solar radiation in summer conditions, Mediterranean site.PCMs are promising kind heat storage materials that particularly good some climatic conditions: if properly placed, they can decrease flux through walls, thus reducing cooling loads buildings.Due their strong non-linearity behavior, PCMs must be carefully modeled, possibly transient...

In this paper a numerical model aimed at studying dynamic behavior of CHP (Combined Heat and Power) plants is presented, paying particular attention to the components in which heat transfers take place. The analysis refers system powered by an internal combustion engine for compression ignition type cogeneration configuration, equipped with two extractors: first one coolant / water, second exhaust gas water. has been implemented using Matlab-Simulink software. After description simplifying...

The CFD analysis of a Venturi nozzle operating in LBE (key component the CIRCE facility, owned by ENEA) is presented this paper. facility developed to investigate detail fluid-dynamic behavior ADS and/or LFR reactor plants. initial simulations have been hand with comparison experimental data: test results were used confirm reliability model, which, turn, was improve interpretation data. modeled 3D code (STAR-CCM+). Later on, model has assess performance conditions different from ones tested...

Abstract Uneven distribution of phases in plate heat exchangers is a cause reduction both thermal and fluid-dynamic performances. With respect to two-phase flows, phase separation manifolds with several outlets complex phenomenon no general rules are available for predicting the at header–channel junctions. The design compact their distributors still based on empirical approaches experimentation numerical analyses needed defining best geometries able reduce mass flow rate non-uniformities...