Telecommunication systems make use of optical signals to transmit information. The strength of a signal in an optical network deteriorates and loses power as it gets farther from the source, mainly due to attenuation. Therefore, to enable the signal to arrive at its intended destination with good quality, it is necessary to regenerate it periodically using regenerators. These components are rel...

An acoustic field spontaneously induced in a thermoacoustic prime mover consisting of a looped tube and resonator is determined through simultaneously measurements of pressure P and velocity U. A thermal efficiency of the thermoacoustic prime mover of this type has been reported to reach 30%. The measurements of the acoustic field in the present system revealed that a phase lead of U relative t...

Thermoacoustic functions are important parameters of one-dimensional codes used for the design of thermoacoustic engines. The thermal and viscous thermoacoustic functions allow the inclusion of three dimensional effects in one-dimensional codes. These functions are especially important in the regenerator of a thermoacoustic engine, where the thermoacoustic heat pumping occurs. Even though analy...

We present a novel class of reduced-order regenerator models that is based on Endoreversible Thermodynamics. The rest upon the idea an internally reversible (perfect) regenerator, even though they are not limited to description. In these models, temperatures working gas alternately streams out regenerator’s hot and cold sides defined as functions state matrix. matrix assumed feature linear spat...

In an optical network a signal can only travel a maximum distance of dmax before its quality deteriorates to the point that it must be regenerated by installing regenerators at nodes of the network. As the cost of a regenerator is high, we wish to deploy as few regenerators as possible in the network, while ensuring all nodes can communicate with each other. In this paper we introduce the gener...

The features of classical thermodynamic cycle of Stirling engine considering the periodic reciprocal motion of working body through the regenerator have been analyzed in this work. The possibility of satisfactory functioning of modified engine without regenerator with unidirectional pulsating motion of the working body in reсuperative heater and cooler has also been proved. The characteristic f...

The design of a Double Inlet Pulse Tube Refrigerator is investigated by means of an analogy with an electric circuit. The results obtained with the electric scheme are compared with both those of the thermodynamic model (Part A) and experiments. The basic formulation of equivalent electronic components is discussed and a few improvements are proposed to adjust the theoretical expressions of the...

A small 100 W displacer-type Stirling engine, Ecoboy-SCM81 has being developed by a committee of the Japan Society of Mechanical Engineers. The engine contains unique features, including an expansion cylinder which is heated by either combustion gas or direct solar energy. Also, a simple cooling system rejects heat from the working gas. A displacer piston has both heating and cooling inner tube...

1 Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, PA, USA 15213-3890 2 Department of Electrical and Computer Engineering, Carnegie Mellon University, Pittsburgh, PA, USA 15213-3890 3 Isotherm Technologies LLC, Medina, OH, USA 44256-6431 ABSTRACT A new Stirling micro-refrigeration system composed of arrays of silicon MEMS cooling elements has been designed and evalu...

The design of heat transfer performance regenerator is the key technology Stirling machine and great significance to ensure operation efficiency equipment. In this study temperature difference between two ends at room less than 50K. This paper attempts straight channel grid verify its accuracy. At first, a straight-channel was designed in by analyzing influence structural parameters on order re...