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This seems to be due to lack of mixing of the warm outflowing air with the cooler air mass.
Analysis results of internal noise within different carriages in the running and static tests indicate that the air conditioning system has small effect on the interior noise and there are common significant characteristics of internal noise although the air conditioning systems within carriages are different.
Noise from internal sources, such as air-conditioning systems, may also be important.
Acceptable limits for air conditioner noise levels can be derived from the dose response curves produced in this study.
The results are useful for the design of an indirect evaporative air cooler.
To avoid over-dehumidification, the direct evaporative cooler at the processed air side should be replaced by a sensible heat exchanger.
Furthermore, a recently commercialized cooler named Maisotsenko cooler can be integrated in gas turbine inlet air cooling to replace conventional evaporative coolers.
The results show that wet operating improves the sensible and latent cooling capacities of air cooler significantly.

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