Presents results obtained from research of a model of change in condition of systems with a view to raising effectiveness of a technological trial (testing) and to improving preventive maintenance. On the basis of this model, it follows that maximum dispersion of the condition parameter can be used as an early diagnostic parameter. A possible screenplay of change of the stochastic process dispersion which describes the fluctuation parameter has been analyzed. Discusses an example of testing an organizing real manufacturing system according to the statistical characteristics of the condition parameter. Provides a general procedure of preventive maintenance of the system according to the condition, based on synthesis of global and local diagnostics according to a fluctuation thermodynamic model.
The purpose of this paper is to describe an experience of R&D in the field of new technologies for solar energy exploitation within the Italian context. Concentrated solar power systems operating in the field of medium temperatures are the main research objectives, directed towards the development of a new and low‐cost technology to concentrate the direct radiation and efficiently convert solar energy into high‐temperature heat.
The purpose of this paper is to evaluate the thermal and fluid dynamic behaviors of natural convection in a vertical channel‐chimney system heated symmetrically at uniform heat flux in order to detect the differentfluid motion structures inside the chimney, such as the cold inflow from the outlet section of the chimney and the reattachment due to the hot jet from the channel, for different extension and expansion ratios of the adiabatic extensions.
In this study, the thermodynamic properties, energy release, combustion, and emission variations in a spark ignition (SI)engine fueled with alcohol-gasoline blends and gasoline has been investigated. Test results showed that the net indicated work area of alcohol-gasoline blends was wider than pure gasoline blends and also; this situation affected positively the brake mean effective pressure and engine power output. The mass burn ratio of alcohol–gasoline blends was higher than those of pure gasoline. The exhaust emission level decreased with the increase of ethanol content in the fuel blend, but similar results was not observed with methanol–gasoline blends.
In this article we investigate an innovative thermodynamic scheme to recover some of the large drying energy in the superior form of mechanical work at the cost of a small reduction of drying rate. To define properties of this thermodynamic scheme we analyze the performance of a nonisothermal, drying-driven engine in terms of heat and mass fluxes flowing to/from solid and gaseous phases as energy reservoirs.
Thermochemistry, Irreversible processes, Exergy.
Thermodynamics -- Industrial applications. Chemical engineering.
Thermodynamics, Thermodynamic equilibrium.
Irreversible processes, Thermodynamics, Hydrodynamics.
Thermodynamics -- Mathematics. Differentiable dynamical systems.
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