A steady-flow compressor is used to compress helium from 15 psia and 70°F at the inlet to 200 psia and 600°F at the outlet. The
outlet area and velocity are 0.01 ft2 and 100 ft/s, respectively, and the inlet velocity is 54 ft/s. Determine the mass flow rate and the inlet area. The gas constant of helium is R = 2.6809 psia·ft3/lbm·R.
1 answer:
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9. (80-32)5/9
48×5/9
240/9
26.66°C
9. (90-32)5/9
58×5/9
32.22°C
10 (212-32)5/9
180×5/9
20×5
100°C
The final temperature in Celsius of the metal block is 49°C.
<h3>How to find the number of moles ?</h3>Moles water =
=
= 0.0266 moles
Heat lost by water = 0.0266 mol x 44.0 kJ/mol
= 1.17 kJ
= 1170 J [1 kJ = 1000 J]
Heat lost = Heat gained
Heat gained by aluminum = 1170 J
1170 = 55 x 0.903 (T - 25) = 49.7 T - 1242
1170 + 1242 = 49.7 T
T = 48.5°C (49°C at two significant figures)
Thus from the above conclusion we can say that The final temperature in Celsius of the metal block is 49°C.
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