This paper presents solutions to improve the thermal performances of paraffin as a Phase Change Material (PCM) in solar flat-plate collector systems for domestic and industrial applications. These are regarded an effective way solve problem energy supply demand time delay. To address this issue, three different methods were proposed together or separately, namely using 10 PPIs aluminum foams with 0.92 0.95 porosity, various types 5%wt nanoparticles, modifications geometry configurations:...

To address the growing problem of pollution and global warming, it is necessary to steer development innovative technologies towards systems with minimal carbon dioxide production. Thermal storage plays a crucial role in solar as bridges gap between resource availability energy demand, thereby enhancing economic viability system ensuring continuity during periods usage. methods consist sensible heat storage, which involves storing using temperature differences; latent utilizes phase change...

A seawater spray scrubber was set up and tested with focus to desulfurization of marine engine exhaust gas. Experimental tests were carried out simulating typical conditions a diesel burning heavy fuel oil using real seawater. Different flue gas flow rates, SO 2 concentrations tested. Liquid‐to‐gas ratios in the range 1–10 × 10 −3 . comparison between distilled water also elucidate effect alkalinity. In all conditions, liquid phase analyzed for alkalinity, pH, sulfate content before after...

The stringent international emission legislations and increasing demands for lesser fuel consumption air pollutant emissions in urban environment necessitate substantial effective plans to improve combustion efficiency of anthropogenic activities. For this reason, all the industrialized countries are energetically developing alternative sources order reduce harmful decrease necessity fossil fuel. In context, ethanol can be used as an or additive gasoline owing many advantages, above...

Abstract An unsteady model of SO 2 absorption in fall‐down spherical seawater droplets is presented, focused on marine diesel engine exhaust gas scrubbing. The evaluates the amount sulfur dioxide absorbed by a single droplet, with given initial velocity, diameter, and alkalinity, falling counter‐flow respect to stream. Kinematics heat exchange, evaporation has been considered, taking into account internal circulation. Neutralization species droplet modeled global fast reaction mechanism....

Low-power gas turbines have been widely used for decades as combined heat and power. In the recent years, they received increasing interest with respect to applications such range extenders in automotive sector alternative fuels use. this framework, present work analyzes combustion stages optimization of an intercooled regenerative reheat gas-turbine system, a low power turbine. particular, thorough analysis was carried out identify optimal system configuration order ensure suitable turbine...

Due to increasing worldwide trade, transportations of goods through seaports have been gradually growing in the past years; harbours are main centres economic activities, with unavoidable consequences on air quality degradation and human health many urbanized ports. This study provides a methodology assess impact pollutant emission from marine engines ambient coastal areas. The environmental pollution sea traffic was evaluated by assessing production atmospheric dispersion exhaust emissions...

This paper provides fundamental principles to study the thermodynamic performance of a new screw expander–based solar thermal electricity plant. While steam turbines are generally used in direct generation systems without admitting fluid two-phase conditions, expanders, as volumetric machines, can convert mechanical energy also by expanding liquid-steam mixtures decline efficiency. In effect, not competitive expanders when net power is smaller than 2 MW and for low-grade heat sources. The...

Abstract The Mild Combustion is a relatively novel combustion technique characicrized by both an elevated temperature of reactants and adiabatic flame not higher than 1600K. These features are the results several technological demands coming form different application fields. main advantages derived concern process itself its applications. In former case pollution reduction, increase efficiency fuel flexibility has to be considered whereas latter one principally related heat treatment wall...

The analysis two-phase flow inside centrifugal pumps is a fundamental issue in several engineering applications. This often represents bad working condition with respect to single phase one, causing head reduction, efficiency decrease, and higher operational costs terms of energy money. paper reports numerical bubbles behavior pumps. Equations regulating the air bubble motion within rotor pump have been solved considering effects all forces acting. Coalescence phenomena investigated too,...

This work proposes a hybrid system based on gas turbine or steam/gas plant integrated with solar field either to provide part of the heat addition replace combustor in case that only input is enough ensure working fluid reaches inlet temperature. The can operate pure combustion mode when irradiance weak during some hours day seasons. A thermodynamic model for gas-turbine power presented. consists micro (100 - 110 kW) supported by integrate regeneration and through exchangers. In this way,...

The emission of air pollutants from ships large size is a key factor in quality state the surrounding areas to ports. work proposes methodology for assessing environmental impact maritime traffic on port areas, evaluating production and dispersion produced by marine engines during approach phase port. According current regulations, different scenarios have been analyzed, taking into account possibility fuel changeover, heavy oil (HFO) gas (MGO), approaching Emissions switch HFO MGO...

This paper is focused on solar-biomass integration and presents a thermodynamic analysis of solar power utilization replacing the steam bleeds regenerative Hirn cycle plant, biomass fuelled, in feedwater pre heating process. In integrated configuration an energy conversion efficiency has been evaluated order to compare use solo hybrid configurations. Such adopted as optimization parameter for best plant configuration, varying pressure regeneration parameters.