\"font-family:TimesTenLTStd;\">Figure P4.86 provides steady-state operating data
ID: 1858673 • Letter: #
Question
"font-family:TimesTenLTStd;">Figure P4.86 provides steady-state
operating data for a
"font-family:TimesTenLTStd;font-style:italic;">parallel flow
heat exchanger in which
there are separate streams of air and carbon dioxide
(CO
"font-family:TimesTenLTStd;vertical-align:-2pt;">2
).
Stray heat transfer with the surroundings of the heat exchanger and
kinetic and potential energy effects can be ignored. The ideal gas
model applies to each gas. A constraint on heat exchanger size
requires the temperature of the exiting air to be 20 degrees
greater than the temperature of the exiting CO
"font-family:TimesTenLTStd;vertical-align:-2pt;">2
.
Determine the exit temperature of each stream, in
degrees
"font-family:TimesTenLTStd;">R.
"https://media.cheggcdn.com/media/c9b/c9b4cdac-dbfd-4b26-8b82-849646afeb66/php3Yl8Dd.png"
alt="media/c9b/c9b4cdac-dbfd-4b26-8b82-84" />
"font-family:TimesTenLTStd;">
Explanation / Answer
specific heat capacity for air = 1.04 KJ/Kg-K
specific heat capacity for CO2 = 0.85 KJ/Kg-K
convert all the temperature to Kelvin scale
energy must be conserved
m*C*(dT) air = m*c*(dT) CO2
50*1.04*(577.78-T2-11.11) = 73.7*0.85*(T2-311.11)
T2 = 427.04K = 768.67 R
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