The gas turbine efficiency and productivity loss caused by increasing ambient temperature is a key problem occurs. Thus, the gas turbine inlet air cooling methods have been developed. In this study, the combination of evaporative cooler cooling and simultaneous injection of liquid nitrogen for cooling inlet air to Alstom GT11N2 gas turbine of Fajr Petrochemical has been investigated. This method has not already been investigated in Iran. To investigate the effects of this cooling method Thermoflow version 23 thermodynamic modeling software was used. due to limitations on Fajr Petrochemical production the maximum possible amount of liquid nitrogen to inject is 5 kg/s in peak hours. In this case, the maximum increase of power and efficiency of turbine in comparison with the condition that no cooling is exist is 17.4 MW and 2.01% respectively. In this study, the increased steam production from existing heat recovery steam generators (HRSG) using this combined method of cooling is estimated to average 7.17 tons per hour. In addition, effects of utilizing this method in different relative humidities has been investigated and showed that on relative humidity of 90% using this method cuase further improvement of 1.36% in efficiency and 14.92% in power in comparision with evaporative cooler method.

 Abstract:
In the past two decades, air conditioning systems in residential and commercial
buildings have become one of the largest consumers of electrical power. The need to use
the air conditioning with the emergence of abnormal weather conditions to reach its peak.
The extreme hot or cold weather, high humidity, and air pollution are among the factors
that increase the use of air conditioning systems as well as increases in costs related to
staff. Ahvaz, including in the country is very hot, so use of air conditioning systems in
the city those of increase. But the most important thing is not to determine the exact
cause cooling load of the system in terms of energy consumption is optimized. We can
say then select the appropriate capacity, is a problem because the system needs to select
the appropriate capacity to estimate is accurate cooling load. The most accurate method
to estimate the cooling load is the exact solution, so that energy and mass balance
equations for each component as transient (walls, floors, ceilings, windows, air etc.)
written by solving the equations temperature distributions can be specified steps, cooling
loads and other parameters to be achieved. The aim of this study was to calculate the
cooling load of the building of a school is using methods of dynamic weather conditions
in Ahwaz. For this purpose, a plan of a building with its main elements were considered.
Heat transfer equations for each component of the plan, including walls, ceilings, floors,
windows, and other objects within the building by way of stable transfer functions
(dynamic) written in a programming language MATLAB programs and the results were
compared with the results of Carrier software then the use of information research
materials Shaghayegh Mohammed, check the selection of appropriate materials for use
in the study were school walls. The results of calculating the cooling load of the materials
introduced in MATLAB simulation, it was found that in terms of energy consumption,
materials suitable for use in the wall that have higher thermal delay. Also the same
thermal delay, lead to the selection of materials with lower conductivity.

The use of latent heat storage systems using phase change materials with the (PCM) is an effective way to store thermal energy in energy storage has several advantages such as high density and nature are constant temperature during the storage process. There are a number of PCM with a wide range of temperatures, melting and freezing them more attractive for use in many applications. This study techniques in various compositions with latent heat storage systems verifies the effectiveness of techniques have been used to improve the thermal response of the PCM, rate and amount of latent heat stored and released them. As we shall see, the geometry of the rotor blade length was used to find suitable investments, we study it in three parts: In the first part, the effect of applying eccentric blade exchanger with PCM on the thermal response is evaluated, and the latent heat stored and released rate is investigated and Shows the deformed geometry created in a simple twin-tube exchangers have a positive effect and lead to a smaller percentage of solid paraffin in the bottom of the melt. In the second part, the effect of different pre-investment during the annular space on the thermal response of PCM is investigated and Shows that the number of blades, the more stored energy is greatly increased, but we can see that this blade exchanger in the upper half did not improve heat transfer. The third part is finding the proper length of the blade for improved heat transfer in the phase shift is investigated.