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gas turbines are rated for a power output level (horsepower or
megawatts) at a temperature and altitude condition. two standards
used are the international standards organization (iso) and the
national electrical manufacturers association (nema). iso conditions
are defined as 59°f inlet temperature, 14.7 psia inlet pressure,
and 60% relative humidity, and nema conditions are defined as 80°f
inlet temperature and 1,000-foot elevation. for surface applications, a
rating curve showing power vs. inlet temperature is widely used (figure 5-3). this power curve is influenced by four distinct factors: inlet
air temperature, turbine inlet temperature (i.e., combustor discharge
temperature), rotor speed(s), and compressor aerodynamics.
turbine inlet temperature is a limiting factor in all gas turbines,
regardless of design configuration. this limit has been extended
through utilization of internal turbine airfoil cooling. limitations due
to speed and compressor aerodynamics are distinguished as break
points or slope changes in the power curve. often, these limitations
are of little consequence since they are small relative to the turbine
inlet temperature limitations. the effects of increasing ambient temperature
on gas turbine output clearly indicate the advantages of
cooling the compressor inlet, especially in hot climates. lowering the
compressor inlet temperature can be accomplished by the installation
of an evaporative cooler, a fogger system, or a chiller in the inlet ducting

al la çevir şukuya boğacam seni @31