John,
The compressed air temperature drop will be approx 30 C from 200 to 1 bar.
Reference T-s diagrams for N2. The largest T drop occurs at the first
stage of the regulator, 200 to 10 bar. In water >10 C the 10 bar air is
reheated to near water temperature. Diving in water at temperatures <5 C does
present a regulator freeze issue. Special regulators and procedures are
required.
Dumping a full dive tank will not produce snow in the summer. Done that.
SCUBA air dew point of -53 C (<24 PPM H2O).
Krell
In a message dated 8/21/2015 7:05:51 A.M. Pacific Daylight Time,
johndom@xxxxxxxxx writes:
Is there an expansion due air (gas) temperature drop, say from a 200 bar
cylinder to a diver’s mouthpiece after the pressure regulator? Like a JP
expansion effect? Of course with scuba diving, the regulated pressure is depth
dependent, but still. Any values in °C?
jd
