Air at a given mass flow rate goes in series through two passes of the same length in a heat…

Air at a given mass flow rate goes in series through two
passes of the same length in a heat exchanger. Now consider an alternative
arrangement where those two passes are in parallel coupling and the total
airflow rate is the same (i.e., these cases correspond to Fig. 3.21 vs. Fig.
3.22 for fluid 2). The air-side core pressure drop for the second case will be
the following factor of the core pressure drop for the first case, assuming
fully developed laminar flow through the exchanger. Note that except for different
coupling of two passes, both passes of both exchangers are identical.

(a) 1
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Air at a given mass flow rate goes in series through two
passes of the same length in a heat exchanger. Now consider an alternative
arrangement where those two passes are in parallel coupling and the total
airflow rate is the same (i.e., these cases correspond to Fig. 3.21 vs. Fig.
3.22 for fluid 2). The air-side core pressure drop for the second case will be
the following factor of the core pressure drop for the first case, assuming
fully developed laminar flow through the exchanger. Note that except for different
coupling of two passes, both passes of both exchangers are identical.

(a) 1 (b)  (c) 2

(d)  (e) 4

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