**3. The selection of materials for marine gas turbine engines**

This chapter presents hot corrosion results of selected nickel based superalloys for marine gas turbine engines both at high and low temperatures. The results are compared with a new alloy under similar conditions in order to understand the characteristics of the selected superalloys. It is observed that the nature and concentration of alloying elements mainly decide the resistance to type I and type II hot corrosion. Relevant reaction mechanisms that are responsible for degradation of various superalloys under marine environmental conditions are discussed. The necessity to apply smart coatings for their protection under high temperature conditions is stressed for the enhanced efficiency as the marine gas turbine engines experience type I and type II hot corrosion during service. Hot corrosion problems experienced by titanium alloy components under marine environmental conditions are explained along with relevant degradation mechanisms and recommended a developed smart coating for their effective protection.

Two chapters were written by the same authors and focus on energy and exergy analysis of the Brayton cycle and operation of gas turbines in hot humid and arid climates.

## **4. Energy, exergy and thermoeconomics analysis of water chiller cooler for gas turbines intake air cooling**

Gas turbine power plants operating in arid climates are considered in this chapter. They suffer a decrease in output power during the hot summer months because of the high specific volume of air drawn by the compressor. Energy and exergy analysis of a Brayton cycle coupled to a refrigeration air cooling unit is discussed and shows a promise for

several countries have contributed chapters dealing with a wide range of issues related to analysis of gas turbines and their engineering applications. Gas turbine engine defect diagnostic and condition monitoring systems, operating conditions of open gas turbines, reduction of jet mixing noise, recovery of exhaust heat from gas turbines, appropriate materials and coatings, ultra micro gas turbines and applications of gas turbines are discussed. Analytical and experimental methods employed to identify failures and quantify operating conditions and efficiency of gas turbines that are encountered in engineering

The book contains 11 chapters written by the specialists from various countries who are working in field of design, optimization, maintenance and diagnostics of gas turbines.

Ultra-micro gas turbine generator, that is a power device with high power density, is analysed in this chapter. This generator, although the covered power range oscillates between 100 and 500 W, is characterized by reduced overall dimensions. Design issues and realization of the mechanical components is considered. The economic impact of these devices depends on the performance levels and the manufacturing costs, both of which have yet to be proven. Competitiveness of ultra-micro gas turbine generator with conventional

This chapter presents hot corrosion results of selected nickel based superalloys for marine gas turbine engines both at high and low temperatures. The results are compared with a new alloy under similar conditions in order to understand the characteristics of the selected superalloys. It is observed that the nature and concentration of alloying elements mainly decide the resistance to type I and type II hot corrosion. Relevant reaction mechanisms that are responsible for degradation of various superalloys under marine environmental conditions are discussed. The necessity to apply smart coatings for their protection under high temperature conditions is stressed for the enhanced efficiency as the marine gas turbine engines experience type I and type II hot corrosion during service. Hot corrosion problems experienced by titanium alloy components under marine environmental conditions are explained along with relevant degradation mechanisms and recommended a developed

Two chapters were written by the same authors and focus on energy and exergy analysis of

**4. Energy, exergy and thermoeconomics analysis of water chiller cooler for** 

Gas turbine power plants operating in arid climates are considered in this chapter. They suffer a decrease in output power during the hot summer months because of the high specific volume of air drawn by the compressor. Energy and exergy analysis of a Brayton cycle coupled to a refrigeration air cooling unit is discussed and shows a promise for

the Brayton cycle and operation of gas turbines in hot humid and arid climates.

applications.

**2. Ultra-micro-gas-turbines** 

machines in a cost per installed kilowatt is discussed.

smart coating for their effective protection.

**gas turbines intake air cooling** 

**3. The selection of materials for marine gas turbine engines** 

increasing the output power with a little decrease in thermal efficiency. A thermo-economics algorithm is developed to estimate the economic feasibility of the cooling system. The cost of adding the air cooling system is also investigated and a cost function is derived that incorporates time-dependent meteorological data, operation characteristics of the gas turbine and the air intake cooling system and other relevant parameters such as interest rate, lifetime, and operation and maintenance costs.
