Question: A coflowing ( same direction ) as shown in Fig. Q 3 , heat exchanger has one line with 0 . 2 5 k g

A coflowing

(

same direction

)

as shown in Fig. Q

3,

heat exchanger has one line with

0.25 k \frac{g}{s} .

oxygen at

17 C

and

200

kPa entering, and the other line has

0.6 k \frac{g}{s}

nitrogen at

150

kPa and

500

K entering. The heat exchanger is long enough so that the two flows exit at the same temperature. Use constant heat capacities and find the exit temperature and the total rate of entropy generation. Calculate the second

-

law efficiency of the coflowing heat exchanger in Problem

9.62

with an ambient temperature at

17 C .

Hint: Take dead state conditions as

T_{o} = 17 C

and

P_{o} = 100

kPa

A coflowing ( same direction ) as shown in Fig. Q

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