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2. Breath Energy
[10 pts)
An adult at rest takes a breath approximately 15 times per minute with each lungful exchanging
about 0.5 L of air (at the ambient T and p). It is then expelled with a near-constant temperature
of 35°C and RH=95%. If the ambient air is has a temperature of 10°C and a dew point of 6°C:
a.) Determine the average heating/cooling rate due to the exchange of enthalpy (sensible heat) in
Watts
b.) Determine the average evaporative cooling that is conducted by this exchange (in Watts)
c.) How much water (kg) does this imply the person loses per day?
d.) With a semi-quantitative sketch. decide if it is likely that this person would see their breath.
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