Author name: Admin

1-May

20-40

100-150

1000-1500

0.3 to 0.8

1.25 to 3.125

3.5 to 7.0

8-Dec

fixed charges initially

running cost of cooling water for condenser

vapour & liquid load both

running cost of steam for reboiler

Volumetric

Shear

Linear

none of these

0 to 0.08

0 to 0.8

0 to 1.5

0 to 2.2

(ph – dh)/ph

(ph – dh . dt/2)/ph

(ph – dt)/ph

(ph – dh)/dh

Sensible heat changes for vapour & liquid are negligibly small.

Reflux is not a saturated liquid.

Molar latent heat of the two components are equal.

Heat of mixing of normal liquid is assumed to be zero.

is always less than arithmetic average value.

is always more than arithmetic mean value and the geometric mean value.

is always less than arithmetic mean value, but more than geometric mean value.

may be either more or less than geometric mean and arithmetic mean value depending upon whether the flow of stream is co-current or counter-current.

clearance of 25-75 mm.

cap pitch of 1.3-2 times the cap diameter.

either ‘a’ or ‘b’.

neither ‘a’ nor ‘b’.

0.5″ -1.25″.

2″-3.5″.

5″.

half the tray spacing.