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Thermodynamic analysis and analytical simulation of the Rallis modified Stirling cycle

Ranjan Ravi Kant, Verma Suresh Kant

Archives of Thermodynamics

2019

Vol. 40, no 2

35--67

A Stirling cycle was developed by Rallis considering the adiabatic behaviour instead of isothermal behaviour of working fluid inside the expansion/compression volume, since the isothermal processes are very difficult to be realised in actual practice due to irreversibilities. In order to increase the performance of Rallis Stirling cycle engine, two modified versions of Rallis Stirling cycle engine model have been proposed and developed, called as Rallis modified Stirling cycle engine (RMSE). In this paper, the thermodynamic analysis of the developed models have been carried out and the simulated results are compared with the Rallis ideal model of Stirling cycle engine, as this model describes more accurately the thermodynamic cycle of practical Stirling machines. The results reveal the fact that the thermal efficiency of RMSE I model is enhanced by 38.06% and that of RMSE II model by 48.42%, whereas the power output is increased by 58.05% and 78.19% in case of RMSE I and RMSE II model respectively, when compared with the Rallis ideal adiabatic model of Stirling engine.

Symulacje nieizotermicznych charakterystyk statycznych diody Schottky'ego z węglika krzemu w programie SPICE

Zarębski J., Dąbrowski J.

Elektronika : konstrukcje, technologie, zastosowania

2004

Vol. 45, nr 11

16-19

Praca dotyczy problematyki modelowania diod Schottky'ego z węglika krzemu (SiC), z uwzględnieniem efektów termicznych, w programie SPICE. Przedstawiono i szczegółowo opisano elektrotermiczny makromodel diody Schottky'ego SiC dla programu SPICE, opracowany przez firmę Infineon Technologies. Makromodel został zweryfikowany doświadczalnie. Zaproponowano modyfikacje poprawiające jego dokładność.

The paper deals with the problem of SPICE modelling of the class of silicon-carbide (SiC) Schottky diodes with thermal effects (selfheating) taken into account. In the paper the SPICE electrothermal (including selfheating) macromodel of Infineon Technologies SiC Schottky diode is presented and detaily investigated. The considered macromodel has been verified experimentally and some modifications of the macromodel were introduced.

Calculation of nonisothermal characteristics of slide journal bearings by means of approximation formulae

Świderski W.

Mechanics and Mechanical Engineering

1998

Vol. 2, nr 1

113--131

The results of the computer simulation concerning the generation of approximation formulae for calculations of static and dynamic characteristics of a slide journal bearing with a cylindrical bush with a full angle of contact are presented. An adiabatic flow of the oil has been assumed, taking into accoimt the mixing of the oil in the vicinity of the supply groove. The approximation formulae have been generated using the least square method.