1. The following surface area components are needed to evaluate primary surface area in a plate-fin.

1. The following surface area components are needed to
evaluate primary surface area in a plate-fin heat exchanger:

(a) total plate area (b) fin height area (c) fin base area
covering plate

(d) area of side header bars

(e) area of header bars and plates at the core inlet and
outlet face

2. In an offset strip fin exchanger, the secondary area
consists of the:

(a) fin height area (b) fin edge height area

(c) plate area (d) header surface area

(e) fin edge width area