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The use of solar energy to produce mechanical or electrical energy is presently a good related to environmental concern and sustainable power production. We propose in this paper to develop a model of a Thermomechanical solar system, with a Stirling engine. The presented model is a first step in the optimization of the main functional parameters, using only thermodynamics of the system (whatever the...
Free-piston Stirling power generating system is a complex coupling system of thermo-mechanical-electrical, the thermo-electrical efficiency of which is affected by many factors. The effect of critical parameters of core components on system efficiency is a main focus, including the regenerator porosity and the change of wire screen diameter on the effect of system, the regenerator changes of flow...
The article deals with justification to choose optimal thermodynamic condiions to generate porous ammonium nitrate in the vortex granulators. Advantages of granules modification are justified by way of humidification and further thermal treatment. The necessity to improve technologies for porous ammonium nitrate generation is shown with aim to form meso- and macropores on the surface of the granule...
This article presents a theoretical background for an artificial neural network (ANN) model of the alpha type Stirling engine where thermodynamic dependencies, connected with equations of motion for the piston-crankshaft system with three degrees of freedom were taken into account. Because of the highly nonlinear description of Stirling engine dynamics, the ANN was employed, that modelled output power...
The arc column mathematical model taking into account the thermodynamic processes in the damaged equipment is described in the article. The functioning of the model is based on the use of the first law of thermodynamics and the 2nd Kirchhoff's rule. Nonlinear dependencies of the electrical and thermodynamic parameters on temperature and pressure of the arc column plasma play an important role in the...
Recently, many researchers focus on the applications of ionic liquids (ILs) because they are almost non-volatile, thus appear to be easily separated. One of the applications is that ionic liquids can be used as entrainer in extractive distillation. This work designs an extractive distillation system using ionic liquids as entrainer for isopropyl alcohol (IPA) dehydration. First, a way to build thermodynamic...
With reference to the disproportionation of trichlorosilane to silane, a three-stage consecutive reversible reaction with a rather unfavorable reaction kinetics, in-depth comparison in steady-state performance is performed between the column with a single reactive section and those with multiple reactive sections, adopting the equal number of trays and the equal amount of catalyst. The reactive distillation...
The problems of the measurement of thermophysical properties of materials are recently focused in many research and industrial branches. The problems of the last period are rising from the needs of increasing consumption of the energy. To solve the problems of how to get available of the renewable sources on one side and measures preventing energy losses on the other side are highly demanded. Thus...
The supply of waste heat represents a huge and freely available amount of energy that make it a key target for energy conversion technologies, notwithstanding the small thermodynamic efficiency to be expected because of the limited working temperature difference.
Thermal systems are being encountered in nearly all the engineering fields like heat exchangers, energy storage systems, pumps and pipe networks etc. Entropy generation analysis based on second law of thermodynamics is thus a natural want for the optimization of thermodynamic efficiency of engineering flow configurations including those involving porous medium like the one which has been modeled in...
In this paper, we use the Maxwell-Boltzmann partition function to compute network entropy. The partition function is used to model the energy level population statistics where the network is in thermodynamic equilibrium with a heat-bath. Here the network Hamiltonian operator defines a set of energy levels occupied by particles in thermal equilibrium. These energy levels are given by the eigenvalues...
The article deals with the problems of heat transfer through solids. The calculation of the thermal resistance of the system consisting of several layers of solid materials having different thermal resistances on the intensive calculations and the time. In the first part we law of calorimetry equation. On this basis, we can build a theory of one-dimensional and multi-dimensional differential equation...
The paper describes an approach to software development for analysis of industrial heat and power systems having a complex structure with feedback loops. It discusses the possibility to use several programming languages to solve the problem of analyzing the structure of systems. It presents a program for structural analysis using C# in Microsoft Visual Studio. The submitted program allows defining...
As one of equatorial countries in the world, Indonesia has a great potency of solar energy. However, the utilization of this potency is still not optimal yet. In term of electric power production, the utilization of solar energy in Indonesia is currently mostly relied on photovoltaic modules. In this paper, a different approach of application of solar energy is presented. The design is based on solar...
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