Air enters a nozzle steadily at 300 kPa and 87°C with a velocity of 50 m/s and exits at 95 kPa and...

Question

Air enters a nozzle steadily at 300 kPa and 87°C with a velocity of 50 m/s and exits at 95 kPa and 300 m/s. The heat loss from the nozzle to the surrounding medium at 17°C is estimated to be 4 kJ/kg. Determine
(a) The exit temperature and
(b) The energy destroyed during this process.

David · Accepted Answer

We neglect changes in potential energy and write the first law as follows 
inout
hhq 












22
22
VV
 
, we can solve our first law for the outlet enthalpy as follows. 
2
2
22
22
10002
32050
49.3502.

Air enters a nozzle steadily at 300 kPa and 87°C with a velocity of 50 m/s and exits at 95 kPa and 300 m/s. The heat loss from the nozzle to the surrounding medium at 17°C is estimated to be 4 kJ/kg....

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