The gas turbine use in cogeneration plants for thermal and electric power production is constantly increasing especially for low power requirements.

In this paper, firstly a thermodynamic analysis of a Below Ambient pressure discharge Gas Turbine (BAGT) has been evaluated and the BAGT cogenerative performance compared with those of a Brayton Cycle (BC) cogenerative power plant.

Subsequently, an economic investigation of BAGT is carried out and the benefits, with respect to BC, evaluated.

It resulted that the BAGT presents a higher electric efficiency and its employment may strongly increase the budget at disposal for the cogenerative plant investment.

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