On the last years engine researchers has been focused on improving engine efficiency in order to decrease CO2 emissions and fuel consumption, while fulfilling the increasingly stringent pollutant emissions regulations. In this framework, engine downsizing arises as a promising solution, and 2-stroke cycle operation offers the possibility of reducing the number of cylinders without incurring in ...

Journal of Energy in Southern Africa • Vol 19 No 3 • August 2008 Abstract Worldwide attempts are being made to increase the use of our renewable energy sources as well as to use our current fossil fuel energy sources more efficiently. Waste heat recovery forms a substantial part of the latter and is the focus of this project. Stirling technology finds application in both the renewable energy se...

Abstract In the present work, a power law dissipative Carnot-like heat engine cycle of two irreversible isothermal and adiabatic processes with finite time non-adiabatic dissipation is considered efficiency under optimization criteria <mml...

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...

The unavoidable irreversible loss of power in a heat engine is found to be of quantum origin. Following thermodynamic tradition a model quantum heat engine operating in an Otto cycle is analyzed, where the working medium is composed of an ensemble of harmonic oscillators and changes in volume correspond to changes in the curvature of the potential well. Equations of motion for quantum observabl...

Abstract: The difference between quantum isoenergetic process and quantum isothermal process comes from the violation of the law of equipartition of energy in the quantum regime. To reveal an important physical meaning of this fact, here we study a special type of quantum heat engine consisting of three processes: isoenergetic, isothermal and adiabatic processes. Therefore, this engine works be...

In this article, we study the quantum Carnot engine using a one-dimensional infinite well potential model in which two particles are non-interacting, indistinguishable and have same mass. We find that efficiency of is as there one particle. Moreover, can be measured only when L_C/L_A≥2, where L_A L_C widths during isothermal adiabatic expansion, respectively.

Abstract Prospects for the development of diesel engine building are seen in a consistent increase specific indicators due to forcing on average effective pressure with simultaneous decrease loss fuel combustion heat, thermal insulation chamber and use exhaust gas energy. All these measures taken bring real thermodynamic cycle closer theoretical adiabatic cycle. This explains appearance terms a...