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Experimental Activity on a Large SOFC Generator - - Bog - Nova Science Publishers Inc - Plusbog.dk

The Multiscale Analysis Group of the Politecnico di Torino (Italy) is involved in the experimental analysis and modelling of the CHP-100 SOFC Field Unit built by Siemens Power Generation Stationary Fuel Cells (SPG-SFC). The experimental analysis of a large SOFC generator in operation is a complex task, due to the large number of variables which affect its operation, the limited number of measurements points in the generator volume, the necessity to avoid malfunctions in the real operation. As a consequence, the experimental analysis of the CHP-100 SOFC Field Unit has been developed with methods of Design of Experiments, and with a statistical analysis of the collected data. The experimental sessions have been designed in order to investigate the effect of two important operation factors in order to characterise the operation of the single sectors of the SOFC generator, and to obtain the sensitivity maps of the main investigated dependent variables. Furthermore, the main result is the estimation of the local values of fuel utilisation of the various sectors of the generator, through the combination of the experimental voltage sensitivity analysis to overall FC and an analytical model of polarisation, to outline the distribution of fuel inside the generator. Finally, the sectors of the generator, of different pedigree and position, are compared in terms of the polarization effects, showing how the local fuel utilisation and temperature affect the estimated local anode exchange current density values.

DKK 366.00

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Design & Realization of a Generator Test Bench Working with a Diesel & Biodiesel Blend - Zied Driss - Bog - Nova Science Publishers Inc - Plusbog.dk

In this book, the authors are interested in the design and the implementation of a generator test bench that works with a diesel-biodiesel mixture. The goal is to introduce and test the effect of biodiesel addition in carburant. To do this, the authors started their work through the development of an appropriate design. After completing the preparation of the test bench, the authors installed all the necessary instruments. With this equipment, the overall characteristics of the generator running for the first time with diesel and then with different proportions of biodiesel, capping at 50% were studied. This work is of great importance because it solves the ecological problems mainly related to the toxic rejection of conventional fuels.

DKK 1034.00

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The Effects and Performance Analysis of Non-linear Phase Noise in All Optical OFDM Systems - Iraj Sadegh Amiri - Bog - Nova Science Publishers Inc -

Due to the limitation of the electrical OFDM signal and electrical Fast Fourier Transform (FFT), all-optical OFDMs have recently received much attention. Accordingly, this research study was conducted to investigate the effect of phase noise in the performance of an all-optical OFDM transmission system with 4-point FFT single mode fiber (SMF) links by considering the effects of fiber length, input laser power and a number of channels. In all optical systems, the transmitter side consists of a comb power generator, wavelength selected switch and an optical QAM generator. A comb power generator generates channels with a frequency separation of ∆f=25 GHz. Subsequently, a Wavelength Selected Switch (WSS) was used to split subcarriers and then the subcarriers were modulated individually with Optical QAM modulators. As the results show, a higher number of channels led more phase noise in terms of XPM and FWM nonlinearities, and signal power was the main factor in nonlinear fiber optics. As a consequence, there is more phase noise distortion at a higher signal power for a higher number of channels rather than the lower number of channels.

DKK 820.00

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Asymmetric Electrostatic Forces & a New Electrostatic Generator - Katsuo Sakai - Bog - Nova Science Publishers Inc - Plusbog.dk

It is well known that there are three kinds of electrostatic forces: gradient force, image force, and the Coulomb force. The gradient force acts on a non-charged body that is placed in a convergence electric field. Image force acts on a charged body placed nearby a conductive plate. The Coulomb force acts on a charged body placed in an electric field. As for the shape of these bodies, only symmetric forms have been treated in the past. The representative example for all three force types is globala sphere. Forty years ago, potential of a spherical body could be calculated. In contrast, today we can calculate the potential of any shape by computer simulation. In this book, simulation of the electrostatic force that acts on asymmetrically shaped conductors is carried out.

DKK 633.00

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Understanding Time Evolution - - Bog - Nova Science Publishers Inc - Plusbog.dk

The book first considers that the evolution of quantum operators is canonical with the total Hamiltonian, and that the generator of the temporal evolution of the classical variables is the mean value of this Hamiltonian, evaluated with a purely quantum Density Matrix. The authors introduce the general MaxEnt Density Matrix for systems where quantum and classical degrees of freedom interact. This methodology can describe the interaction between microscopic and macroscopic degrees of freedom. Next, the objectivity of the mathematical description of electric charge transport is explored. It is shown that the description of electric charge transport using fractional order derivatives is non objective. Similarly, the closing study explores the mathematical description of mechanical movement.

DKK 624.00

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Micro-CHP Power Generation for Residential & Small Commercial Buildings - Louay M Chamra - Bog - Nova Science Publishers Inc - Plusbog.dk

The traditional structure of the electrical utility market, green engineering issues, and environmental acceptability have resulted in a relatively small number of electric utilities. However, today''s technology permits development of smaller, less expensive power systems, bringing in new, independent producers. Competitions from these independent producers along with the re-thinking of existing regulations have affected the conventional structure of electric utilities. The restructuring of the electric utility industry and the development of new "onsite and near-site" power generation technologies have opened up new possibilities for buildings, building complexes, and communities to generate and sell power. Competitive forces have created new challenges as well as opportunities for companies that can anticipate technological needs and emerging market trends. Micro-cooling, heating, and power (micro-CHP) is decentralised electricity generation coupled with thermally activated components for residential and small commercial applications. A micro-CHP system consists of a prime mover, such as a reciprocating engine, which drives a generator, which produces electrical power. The waste heat from the prime mover is recovered and used to drive thermally activated components and to produce hot water or warm air through the use of heat exchangers. Micro-CHP holds some of the answers to the efficiency, pollution, and deregulation issues that the utility industry currently faces. A review of micro-CHP systems, specific types of distributed power generation, and thermally-activated technologies are introduced and discussed in this book.

DKK 534.00

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