Abstract We study the thermodynamic performance of a finite-time non-regenerative quantum Stirling-like cycle used as heat engine. consider specifically case in which working substance (WS) is two-level system (TLS). The Stirling made two isochoric transformations separated by compression and an expansion stroke during WS contact with thermal reservoir. To describe these strokes we derive non-M...

Refering to figure 1 [Fig.1], an oscillating « flipper » piston (1) and its associated chamber (2) are maintained without reciprocal contact. No oil is required because there no contact so friction. An shaft (22) maintains the »piston (1). Around (22), a twisting seal (8) allows for absolute sealing. This characteristic important Stirling engines oil-free compressors. Referring 4 [Fig.4], two p...

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...

Although the Stirling engine was invented in 1816, this heat engine still continues to be investigated due to the variety of energy sources that can be used to power it (e.g., solar energy, fossil fuels, biomass, and geothermal energy). To study the performance of these machines, it is necessary to develop and simulate models under different operating conditions. In this paper, we present a one...

A new low-cost design for a free-piston Stirling engi ne driven heat pump is presented. The new approach uses a linear-acting magnetic coupling to transfer engine power across a hermetic shell. Camp l i ance in the coupling affects the performance and stability of the system, especially with regard to matchin g the engine dynamics to the compressor load. This paper first describes test results ...