An axial compressor has high efficiency under design conditions, but its stable working range is narrow. Adjusting the rotational speed can effectively expand range. In this paper, a five-stage for specific compressed air energy storage (CAES) system taken as research object, and different (DRS) characteristics are studied with NUMECA software. Firstly, influence of DRS on overall aerodynamic p...

Environmental concerns and depletion of nonrenewable resources has made great interest towards renewable energy resources. Cleanness and high potential are factors that caused fast growth of wind energy. However, the stochastic nature of wind energy makes the presence of energy storage systems (ESS) in wind integrated power systems, inevitable. Due to capability of being used in large-scale sys...

The paper presents a simplified mathematical model for a scroll-type air motor. Through air power/energy analysis, it has shown that a scroll-type air motor with a properly specified structure and suitable pressure of compressed air supply is able to achieve high energy efficiency and satisfies air power requirement. The features of a scroll-type air motor in geometry, mechanical structure, and...

Heat transfer during compression of air in a long, thin tube is studied by CFD. The tube represents one of the many in a honeycomb geometry inserted in a liquid piston air compressor to minimize temperature rise. A dimensionless number for the heat flow rate that includes the changing heat transfer area between the tube wall and air during compression is used. From the CFD results, alinear rela...

Faults are unwanted events in any industrial production system. Early detection and diagnosis of faults automated systems is important order to prevent equipment damage, loss performance profits. For this purpose, more sophisticated complex for observation monitoring basic characteristics processes being built. Preconditions increasing their efficiency processing analysis process information ob...

UNLABELLED Nebulised drugs are very useful in COPD exacerbations. The most frequently used propellant is compressed air, which is commonly administered together with nasal oxygen in those patients with respiratory failure. The purpose of this approach is to avoid the risks inherent in breathing high inspiratory oxygen fractions (FIO(2)). AIM To analyze the actual FIO(2) obtained with such a c...

The main concern of this paper is speech data compression for low-cost embedded systems such as voice-related toys or devices with interactive sound-responses. We use a PC to generate and compress 8-bit-speech-data that has various features such as human speech, symphony and animal songs; the compressed data are then transferred to a masked-ROM. An Intel 8051 embedded chip is employed to expand...

Surveillance and Control of air quality in an industrial site close to urban areas in Arganda del Rey (Madrid), by means of a flexible, open and configurable net. * SURVEILLANCE AND MESSAGES DECISION: Through a set of local units distributed at the industrial site that process sensor signals following a user protocol and make decisions on: 1) signals acquisition and 2) alarm messages transmissi...