A cold air unit allows for cabin temperatures to be
- a little more than ambient air temperature.
- lower than ambient air temperature despite compression heating.
- same as ambient temperature, despite compression heating.
Explanation from PART66Online
A cold-air unit can take the charge air well BELOW ambient temperature. The ambient floor belongs to the HEAT EXCHANGER, which can only drive its cold side towards the temperature of the ram air it rejects heat into and never past it. The TURBINE is not limited that way: it produces cooling by expansion, extracting work from the air, and its outlet temperature is limited by the pressure ratio available to it rather than by ambient. That is precisely why freeze protection is fitted downstream of the turbine -- without it the outlet can reach icing temperatures on a warm day.
Jordi asked · 2 Sep 2021
why not lower?It says cold air unit.
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