Abstract
An enhancement of gas turbine (GT) fuel efficiency at high temperatures of ambient air is possible by its cooling in exhaust heat conversion chillers (EHCCh) using the heat of exhaust gas. The cooling capacity of EHCCh should cover the GT inlet air cooling needs for as long time as possible during the year with great fuel effect. As a criterion to determine the rational design cooling capacity of the EHCCh the annual fuel saving of GT due to inlet air cooling is chosen. To avoid oversizing the EHCCh, chillers have to operate at heat loads closed to their design values. To satisfy these requirements, the EHCCh should be designed for rational cooling capacity value that provides the maximum yearly fuel saving due to gas turbine inlet air cooling. Two different methods for determining the EHCCh design cooling capacities, based on the yearly fuel savings due to GT inlet air cooling, are considered, providing a closed to the maximum annular fuel savings and the maximum rate of annular fuel saving increment in response to increasing a cooling capacity. The GT unite with two-stage cooling inlet air to 15 ℃ in the high-temperature air cooler by absorption lithium-bromide chiller (ACh) and further subcooling down to 10 ℃ in the low-temperature air cooler by ejector chiller (ECh) are considered for evaluation of the fuel saving and rational design cooling capacities of chillers in different climatic conditions.
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