The ingot. This in turns allows avoiding

currently observed global involvement in the development of renewable energy
sources favors the production of wind energy, which is considered one of the
cleanest and cheapest ways of obtaining the green energy. In order to product
this type of energy it is necessary to provide the appropriate materials for
the construction of wind turbines. One of the components of wind turbine is the
windmill shaft on which rotor is mounted. To ensure desired strength and
quality requirements during the windmill shaft production process, it is
necessary to use carefully prepared heat treatment that provides required
properties of the final product. The proper selection of the parameters such
as: rate of heating to the austenitization temperature, rate of cooling during
quenching etc., allows minimizing stresses and strains that develop inside the
heat treated ingot. This in turns allows avoiding defects caused by fractures.
Also, the thermodynamic performance of an air standard dual cycle with heat
transfer loss, friction like term loss and variable specific heats of working
fluid needs to be analyzed. The relations between the power output and the
compression ratio, between the thermal efficiency and the compression ratio, as
well as the optimal relation between power output and the efficiency of the
cycle, can be derived by detailed simulation experiment. Moreover, the effects
of variable heats and the friction like term loss on the irreversible cycle
performance need to be analyzed. 


is well known that gas turbine performance improves with an increase in turbine
inlet temperature. This has caused a continuing trend towards higher gas
turbine inlet temperatures and resulted in higher heat loads on turbine
components. Hence, turbine blade external and internal cooling techniques must
be employed in order to maintain the performance requirements. But in case of
energy generation by wind turbine, it is not true. It is very important to
analyze the impact of heat on wind turbine unit. In such cases, end user energy
generation cost increases with increase of temperature. Hence for renewable
energy system, “heat transfer” becoming crucial element for affordable unit
cost. There have been many studies to
investigate the effect of unsteady wake on the downstream blade (without film
holes) heat transfer coefficient distribution, which is caused by the relative
motion between the upstream nozzle vanes and the downstream blades. It is clear
from published results that this unsteady wake enhances the leading edge heat
transfer and causes an earlier and longer laminar-turbulent transition on the
suction surface. This elongated transition zone causes increased heat transfer
over a larger area. Many investigations have been made to study the effect of
unsteady wake and mainstream turbulence on the flow field and heat transfer
coefficients of a downstream turbine blade.

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In order to determine the changes in
the temperature and stress fields during heat treatment of the windmill shaft
new developed software utilizing the Finite Element Method and P&O
Algorithm will be used. This software can also be used to calculate temperature
changes and stress field. This research work is innovative at the international
research level.  In the field of hear
transfer lot of research is going on but the proposed research work is based on
the renewable energy product which may prove great contribution.