European Journal of Technology and Design

54-62

Authors: Igor N. Rozenberg

This article describes the management of the transport sector. The article shows that modern transport management techniques uses semiotic and situational control. The article argues that modern transport management described in the information structures and information units. The analysis of first introduced the concept of information unit showed that it corresponds to the content of the concept of information structure. The article shows that information structures and information units integrate the semiotic and situational control in a single technology.

72-78

Authors: H. Sreedharan, J.R. Reshma, J.K. Jacob, V.V. Sivakumar

The energy of exhaust gases from gas turbines are recovered by an unfired HRSG to supply steam to the steam cycle. The first law of thermodynamics deals with quantity of energy and asserts that energy cannot be created nor be destroyed. But, the second law deals with quality of energy. It is concerned with degradation of energy during a process. It gives an insight to the lost opportunities to do work. Thus it gives lot of scope for improvement. This makes second law analysis a powerful tool in optimization of complex thermal systems. Exergy also known as availability is the maximum useful work that could be obtained from the system at a given state in a specified environment. In this paper the variation of exergetic efficiency of gas turbines and their impact on thermal efficiency of combined cycle with variation of gas turbine parameters is demonstrated.