Lecture_25_for_web - Monday Professors Paul Steen &...

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Unformatted text preview: Monday Professors Paul Steen & Jeff Varner will come to class to tell you about their groups research. A gas stream containing 60 wt % ethane and 40 wt% butane is heated from 150 to 250 K at constant pressure = 5 bar. Assume this mixture behaves like and ideal gas. What is the rate of heat required? ethane T = 150 K, P = 5 bar T = 250 K, P = 5 bar V 0.00171 m 3 /kg 0.1288 m 3 /kg H 314.3 kJ/kg 973.3 kJ/kg butane T = 150 K, P = 5 bar T = 250 K, P = 5 bar V 0.00139 m 3 /kg 0.00160 m 3 /kg H H = 30.0 kJ/kg 237.0 kJ/kg From: Perrys table 2-255 for ethane 2-240 for butane For an ideal gas or ideal solutions = i i mix H x H Real gases do not follow this rule because of differences arising from enthalpy of mixing or enthalpy of solution. A gas stream containing 60 wt % ethane and 40 wt% butane is heated from 150 to 250 K at constant pressure = 5 bar. Assume this mixture behaves like and ideal gas. What is the rate of heat required? ethane T = 150 K, P = 5 bar T = 250 K, P = 5 bar V 0.00171 m 3 /kg 0.1288 m 3 /kg H 314.3 kJ/kg 973.3 kJ/kg butane T = 150 K, P = 5 bar T = 250 K, P = 5 bar V 0.00139 m 3 /kg 0.00160 m 3 /kg H H = 30.0 kJ/kg 237.0 kJ/kg From: Perrys table 2-255 for ethane 2-240 for butane s p k W Q E E H & & & & & = + + H Q & & = For an ideal gas or ideal solutions = i i mix H x H Real gases do not follow this rule because of differences arising from enthalpy of mixing or enthalpy of solution. H m Q = & & ( ) ( ) in b b e e out b b e e H x H x H x H x m Q + + = & & A gas stream containing 60 wt % ethane and 40 wt% butane is heated from 150 to 250 K at constant pressure = 5 bar. Assume this mixture behaves like and ideal gas. What is the rate of heat required? ethane T = 150 K, P = 5 bar T = 250 K, P = 5 bar V 0.00171 m 3 /kg 0.1288 m 3 /kg H 314.3 kJ/kg 973.3 kJ/kg butane T = 150 K, P = 5 bar T = 250 K, P = 5 bar V 0.00139 m 3 /kg 0.00160 m 3 /kg H H = 30.0 kJ/kg 237.0 kJ/kg From: Perrys table 2-255 for ethane 2-240 for butane s p k W Q E E H & & & & & = + + H Q & & = For an ideal gas or ideal solutions = i i mix H x H Real gases do not follow this rule because of differences arising from enthalpy of mixing or enthalpy of solution. H m Q = & & Take a basis of 1 kg/s, then s kg m e 6 . = & s kg m b 4 . = & + = kg kJ s kg kg kJ s kg Q . 273 4 . 3 . 973 6 . & + kg kJ s kg kg kJ s kg . 30 4 . 3 . 314 6 . s kJ Q 4 . 502 = & ( ) ( ) in b b e e out b b e e H x H x H x H x m Q + + = & & A really intense fraternity house dish sanitizer takes 80 kg of saturated steam at 100 C and atmospheric pressure and heats it to 500 C. When the sanitizer is new, the steam is heated at constant volume. After several years of parties and kitchen sports, steam is heated at constant volume....
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This note was uploaded on 11/09/2008 for the course CHEM 2190 taught by Professor Daniel during the Fall '08 term at Cornell University (Engineering School).

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Lecture_25_for_web - Monday Professors Paul Steen &...

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