Figure 3-4.--GTGS enclosure-left side view.
just above the base. The blow-out panel is located
exhaust. The flow of exhaust gas past this gap
in the enclosure roof panel on the left side. It is
pulls the cooling air out of the enclosure and into
the uptake. The cooling fan(s) is only activated
forward of the cooling air inlet silencer.
if this natural flow is not enough to keep the
enclosure air temperature below 195F.
Module Cooling Air Flow and
Temperature Monitoring
DD MODULE TEMPERATURE MONI-
Cooling air is extracted from the GTE
TORING. --Two temperature switches, a
combustion air intake duct and flows through a
thermostat, and an RTD are associated with the
cooling air system. These components are all
louvered cooling air modulator on the model 104.
Then it flows through an axial fan (two on CGs)
located inside the acoustical enclosure. One switch
and a fire damper. It is ducted into
controls the cooling air fan, turning the fan on
when the air temperature in the enclosure is 195F
the enclosure, entering the enclosure through a
and off when it is 175F. The second switch
silencer mounted on the aft (exhaust) end of the
activates the ENCLOSURE TEMP HIGH alarm
enclosure roof. Ceiling-mounted baffles in the
indicator at the electric plant control equipment
enclosure direct the cooling air to the forward
(compressor) end of the engine enclosure. The air
(EPCE). It also activates the summary alarm at
the associated switchboard. The alarms are
circulates around the engine and exits through a
gap between the engine exhaust nozzle and the
activated when the enclosure temperature reaches
3-5
