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homework9_guideline

# homework9_guideline - 3 3 50 Q kJ kg m =-h 1 = • Data...

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Guideline of Homework 9 Problem 1 24.31, p. 755 Assume neglect , ( ) KE PE justify Mass Balance Energy Balance . . . . . 1 2 1 2 1 2 3 . . . . . . 1 2 1 2 1 2 1 2 3 . . . . . . 1 2 1 2 1 2 ( ) 0 m h m h m m h Q m h m h Q m h m h Q h m m m m m m + - + + = + + + = = + + + + Recall h = u + pV h sat , V sat and p sat at T cl 1 ( ) ( ) cl sat cl sat sat cl sat compliq sat sat compliq sat h h V p p h h h V p p μ - = - + - = = + - Data @ 20 ° C = 293.15 K (state 1) T (K) h L (kJ/kg) V L (m 3 /kg) p sat (kPa) 290 69.7 0.001001 1.919 293 h L V L p sat 295 90.7 0.001002 2.620 Feedwater heater Liquid 10 kg/s, 1200 kPa, 20 ° C, D 1 = 0.15 m Saturated vapor 15 kg/s, 1200 kPa, 20 ° C, D = 0.4 m 1200 kPa, 188 ° C, D = 0.13 m

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Unformatted text preview: 3 . . 3 50 Q kJ kg m = -h 1 = ? • Data for (2) @ 1200 kPa h 2 = ? • Calculate h3 Recall mass total vap mass h h h h x l g l =--= Problem 2 24.34, p. 756 Energy balance ( 29 ( 29 ( 29 ig i bp h T T C m h h m Q--=-= 1 2 C at T ave h ig = ∆H v from Clausius-Clapeyvon (p. 684,5) Finally, Q = ? Vaporizer 1 atm Liquid 10000 kg/ h, 130 ° C Sat. vapor 1 atm, 250 ° C, 2 . ? m Q =...
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homework9_guideline - 3 3 50 Q kJ kg m =-h 1 = • Data...

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