Gas Turbine
output is a strong function of the ambient air temperature
with power output dropping by 0.54-0.9% for every
1°C
rise in ambient temperature (0.3-0.5 % per 1°F). On
several heavy
frame gas turbines, power output drops of around 20%
can be
experienced when ambient temperatures reach 35°C
(95°F), coupled
with a heat rate increase of about 5%. Aeroderivative
gas turbines
exhibit even a greater sensitivity to ambient
conditions.
A representation of the power boost capability
for given inlet cooling
potential for different types of gas turbines is shown
in Figure 1.
This loss in output presents a significant problem to
utilities,
cogenerators and independent power producers when
electric
demands are high during hot summer months. In the
petrochemical
and process industries, the reduction in output of
mechanical drive
gas turbines often curtails plant output
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systems for power aumengtation of gas turbines
