Generally, temperature affects generator engines starting at 40ºC. Above this ambient temperature: The air is already very hot and its quality is no longer optimal to generate good combustion when mixed with fuel .
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The spray attemperation is designed to limit final steam temperature at HP superheater outlet to final design steam temperature. Intermediate Pressure Steam Generator. The IPSG is composed of an economizer (IP ECON),
The ideal operating temperature of an air compressor is between 50 and 85°F. Within this temperature range, the mechanical components can operate safely without the risk of freezing or overheating. Most

So at 18:24, the ambient capability = (230 – 198.3) + 82.0 = 113.7°F. In this case, the generator set can continue to operate at full load with an outside air temperature of nearly 114°F. When the ambient temperature is at the maximum 114°F (generator set ambient capability), the air temperature at the radiator core would be 148°F.
Under fully loaded conditions, the temperature of flue exhaust from generator sets can be in excess of 900 F and the radiator (engine-driven or remote) discharge air temperature can be in excess of 160 F. Any recirculation of these high-temperature airstreams can cause the ventilation air temperature to exceed the ambient temperature.
Site conditions, including the altitude and relative humidity, will cause the ambient capability to vary. When an enclosure is fitted to a generator set with a radiator and pusher/blower fan, it will lower the ambient capability of the generator set.
The thermal contamination of ventilation airflow should be eliminated or minimized. Generator-room temperatures in excess of 104 F typically require de-rating of the generator set and potential upsizing of components to support the design electrical load.
The ambient capability of a generator set should be quoted at full load, which would account for the most arduous running condition since the ambient capability would obviously improve when running at lower loads with less heat being rejected from the engine and alternator.
For generators with remote radiators, it is recommended that the exhaust air should be sourced as high as possible and directly above the generator sets. Significant bypass of ventilation airflow directly into the discharge airflow will lead to reduction in cooling effectiveness and elevated temperatures within the room.
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