چكيده به لاتين
Abstract:
Ambient temperature is an effective parameter in the performance of gas turbines. Since the gas turbines work in constant volume, the low density of air resulting from hot seasons leads to a significant drop in gas turbines power and efficiency. In this research the technical and economic analyses of cooling and evaporative methods for a 25-MW turbo compressor in three climates, dry and hot, dry and humid and moderate is studied. A simulation model for this purpose was prepaid and with aim of the weather forecast data, the level of power increment and efficiency resulting from cooling method implementation was calculated.
Our findings show that at the design point of dry and hot climate, utilization of evaporative methods has a noticeable function in the optimizing turbo-compressor power and efficiency. Improved power in this climate with implementation of media and fogging systems, %12.1 and %13.4 respectively were calculated. On the contrary, evaporative methods in humid climates did not attribute to a proper improvement, and net power for media and fogging systems was respectively %3.5 and %4.1 improved. However, absorption chillers implementation proved to be more efficient in these climates. For instance, mechanical chiller utilization proved an increment of %22 in output power.
In the economical section of this study, the subject of investment returns for the installation and current costs of each system was also taken into consideration. With evaluation of operation costs, several factors including; improved power, operation timing, consumption fuel increment for each method and investment return period of installation and operationalization for each cooling method was calculated.
Keywords: Turbo Compressor, Power, Efficiency, Evaporative Coolers, Chillers.
