Chapter F: F Fusion Heat

F

fluorine (element)

fahrenheit degrees

F

FAN FORMULAS

where

A	= area of discharge, in. 2
bhp	= brake horsepower
eff	= efficiency, decimal
h	= pressure rise across fan, in. (water)
h S	= static pressure, in. (water)
h T	= total pressure, in. (water)
h V	= velocity pressure, in. (water)
hp	= horsepower, air horsepower
p	= gauge pressure, psig
Q	= flow capacity, ft 3/min
Q D	= discharge capacity, ft 3/min
V	= flow velocity, ft/min
w	= specific weight, Ib/ft 3
W	= weight flow, Ib/min

CD	air horsepower: horsepower output of fan,

brake horsepower: horsepower input required at the fan driveshaft,

flow capacity, discharge:

flow by weight:

horsepower: air horsepower *

static pressure: pressure of a gas in a pipe (or duct), exerted in all directions, measured perpendicular to the flow of the material, and is basically the pressure loss due to friction and other resistances.

total pressure: the sum of static and velocity pressures created by the fan,

CD

velocity:

CD	velocity pressure: pressure in the direction of flow of the material, the difference between total pressure measured and static pressure measured,

FAN LAWS

where

D 1, D 2	= fan diameter, initial and final, ft 2
hp 1, hp 2	= fan horsepower, initial and final
N 1, N 2	= fan speed, initial and final, rev/min
h s1, h s2	= static...