Combined power-refrigeration cycle as an effective approach to enhance the thermodynamic performance of gas turbine power plants

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Giuma M Fellah


In the hot climate zones where the ambient temperature may reach 50oC, the net power output of the gas turbine cycles is extremely deteriorated. In order to reduce the effect of the high ambient temperature, specifically in the summer session, the inlet air could be cooled to the standard temperature of 15oC.

The goal of this article is to determine from the thermodynamic point of view, the feasibility of utilizing an absorption refrigeration cycle to enhance the thermodynamic performance of the combined cycle when the ambient temperatures vary between 15oC and 50oC.

This article proposes utilizing the exhaust gasses of the gas turbine cycle to power both a steam cycle and ammonia-water absorption refrigeration cycle in a combined power-refrigeration cycle. The task of the absorption refrigeration cycle is to keep the inlet air temperature at 15oC.

It is found that the net power output and the thermal efficiency of the power-refrigeration cycle could be increased by 30.16% and 3.12% respectively, over the conventional combined power cycle when the ambient temperature increases from 15 to 50oC.

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