How to understand double shell circuits?
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Double-pass can be understood as N tubes connected in parallel and then in series; thus, the total number of tubes in the heat exchanger is 2N. As a result, the cross-sectional area of the tubes becomes half of its original value, while the flow velocity doubles. Similarly, how should double-shell pass be understood?
N pipes, with a flow area of 1/2.
A double shell pass also reduces the pipe flow area by half. Why is that?
It’s equivalent to two heat exchangers connected in series.
So with a double shell pass, compared to a single shell pass, the fluid flow rate remains the same, the heat transfer area doubles, and the flow resistance doubles as well