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An analysis of an advanced compressed air energy system (CAES) using turbomachinery for energy storage and recovery and for continuous on-site power augmentation as an air Brayton cycle

Japikse D., Di Bella F. A.

Mechanics and Mechanical Engineering

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2018

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Vol. 22, nr 2

479--493

EN

A thermodynamic analysis of an advanced CAES for Distributed Power Generation (DPG) is presented that utilizes turbomachinery for energy recovery, but also gives continuous power generation to augment on-site power. The advanced CAES uses renewable energy such as wind power and solar PV in the power range of 1500 to 2500 kW plus recuperation of waste heat from the existing on-site prime mover to improve the utility of the energy storage system. The proposed system also utilizes battery storage to maintain high energy density storage, preferably without the need for costly electrical rectifying and inversion systems to improve the stabilization of power generation. This proposed system may be thought of as a “cross-over” system that combines CAES technology with electric battery storage technology, particularly if the stored electric power is used directly as D.C. power at an industrial facility. The direct use of stored energy from a battery as heat input to the proposed “cross-over” system also may be considered in some limited applications. The ideal application of the proposed system is for isolated DPG systems perhaps in remote sites utilizing “power islands” of renewable energy augmented with on-site fossil fuel prime mover, power generation systems. The proposed “cross-over” system enables higher reliability, faster response to transient power loads, and the efficient use of renewable energy, as well as heat recovery from conventional prime mover systems that are on site.

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Advances and breakthroughs in diffusers for compressors and pumps: a short history of diffusers for centrifugal machines

Japikse D.

Mechanics and Mechanical Engineering

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2018

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Vol. 22, nr 2

495--508

EN

The diffuser plays an indispensable role in setting the useable flow range and efficiency for centrifugal machinery. Key aspects of the history and design of such diffusers are overviewed followed by a look at current, novel ideas for better systems. Improved machinery can be expected in the coming years due to decades of development work in this field.

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Overview of Performance Modeling and New Model Development for Radial Turbomachinery Using Optimization Search Methodology with an Extensive Database

Japikse D., Pelton R., Oliphant K. N., Dubitsky O.

Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka

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2005

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nr 128, vol. 1

243-264

EN

Performance modeling of centrifugal and mixed-flow compressors and pumps has developed substantially over the past decades. The first half of the 1900s provided important insights as to the basic structure of the fluid dynamic process; the period from 1960 to 2005 provided 45 years of continuous analytical modeling development. Throughout the past century, the radial turbomachinery field awaited the development of a comprehensive loss, diffusion, and deviation modeling system similar to those that evolved for axial turbomachinery. Recently, a concrete foundation for an appropriate modeling system has developed. In this presentation, the basic models are reviewed and, in turn, the available database (more than 250 cases) is surveyed. A fully computerized, data synthesis process, employing optimization search techniques, is presented by which new analytical models can be thoroughly matched to available data.