Notes%2009.27.10

# Notes%2009.27.10 - = kg kJ 19 300 h 300 = 7 So for variable...

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3 Calculate the change in enthalpy of air for a temperature rise from 300 to 800 K. a) assuming constant specific heats b) using the ideal gas tables

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4 For part a), we calculate the enthalpy difference using: T c h p = Where, kgK kJ 040 . 1 ) K 550 ( c ) (T c c p avg p p = = =
5 ( 29 K 300 800 kgK kJ 040 . 1 h - = For constant specific heats: kg kJ 520 h =

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6 For variable specific heats, we’ll use the ideal gas air tables kg kJ 95 . 821 h 800

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Unformatted text preview: = kg kJ 19 . 300 h 300 = 7 So for variable specific heats: kg kJ 76 . 521 h = ∆ Recall for constant specific heats, ∆ h = 520 kJ/kg, which is less than 0.5% difference. TEAMPLAY Compare the enthalpy change in Btu per mole and Btu per pound of He, O 2 , and H 2 O at one atmosphere pressure as the temperature changes from 400 to 600 F. ˚ 8...
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Notes%2009.27.10 - = kg kJ 19 300 h 300 = 7 So for variable...

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