Abstarct: Gas turbine is one of the most important power generating machines. Turbines are widely used in various industries, including power plants, petrochemicals, refineries, pumps, compressors and aircraft engines. Many factors, including the temperature of inlet gases, pressure, temperature and humidity of the inlet air, affect the performance of the gas turbine. Turbine inlet air cooling is one of the ways to improve the performance of the gas turbine. Turbine compressor inlet air cooling can be performed with evaporative cooling methods using fogging and media system, refrigeration cooling using an absorption chiller, combining evaporative and refrigeration methods and using energy storage devices. The inlet air cooling method is considered due to low cost and no need to change the turbine structure to increase efficiency. In the meantime, the use of Maisotsenko cooler model for cooling the inlet air to the gas turbine compressor is also significant. Efficiency and power regeneration in gas turbines are particularly affected by ambient air temperature. Researches show that, for every degree of Celsius, the increase in ambient air temperature can be reduced from 0.54 to 0.9 percent by gas turbine; thus, the inlet air cooling to the turbine compressor is a suitable solution for increasing the power generation and efficiency of gas turbines. Simulating the operation of a turbine in different conditions can lead to the development of a proper pattern of operation of the power plant. Maisotsenko Model as a highly economical and economical model, can be a solution in order to achieve this correct model. This thesis examines the implementation of Maisotsenko cooler with desiccant wheel for gas turbine inlet air cooling and proposed four different inlet air cooling systems used gas turbine heat to strengthen the gas turbine power in Bahregan. From the comparison of the performance of four inlet cooling systems, it can be concluded that additional costs in investment for the implementation of MMD and MED cooling systems with its superior performance in dry climate are justifiable. However, it cannot be said that if used in wet environments, they would be as beneficial as productivity. The cost of EMD and EED investment is less than MMD and MED and may be more suitable for wet climates. Another solution is to increase the number of desiccant wheels for more moisture in the inlet air. More air moisture has more effect on the performance of the Maisotsenko cooler. The effects of increasing the number of desiccant wheels by Zadpoor and Nikooyan (2008) have been investigated and the results show that increasing the inlet cooling capacity of the system is obtained by increasing the number of cycles. However, the pressure drop in the desiccant wheel will be significant and in turn will affect the efficiency of the gas turbine and the net production of energy. The gas turbine efficiency and net energy production are proportional to the inlet compressor temperature. As a result, the gas turbine with MMD as the inlet cooling method has the highest productivity for all recovered temperatures. In addition, the EED inlet cooling results are at the lowest power plant productivity. However, the effect of regeneration temperature on the thermal efficiency of the power plant is relatively little. The results show that the combination of Maisotsenko cooler increases the cost of initial capital. In addition, all four inlet cooling systems are proposed in this thesis for annual electricity generation compared to three other options. baxsed on the return period of capital and the return rate, the direct evaporative cooler is economically justified in the inlet air cooling system for the Bahregan after the ZED inlet air cooler.