In a given tube bank, the actual total length of the tube used is 3 m, the tubesheets are 6 mm thick, and the blanket insulation is 150 mm (Fig.). The effective length of a tube for heat transfer is:...

In a given tube bank, the actual total length of the tube used is 3 m, the tubesheets are 6 mm thick, and the blanket insulation is 150 mm (Fig.). The effective length of a tube for heat transfer is:

(a) 3 m

(b) 2.988 m

(c) 2.838 m

(d) 2.688

(e) can’t tell