13. Furnace stack-E. Air (pe = 0.08 lbm/ft3) flows through a furnace where
it is burned with fuel to produce a hot gas (Pg 0.05 lbm/ft3) that flows up the
stack, as in Fig. P1.13. The pressures in the gas and the immediately surrounding
air at the top of the stack at point A are equal.
A Gas out
A
Air
Air
H= 100 ft
Gas
Air in
Furnace
B
Ah
Water manometer (relative positions
of levels not necessarily correct)
Fig. P1.13 Furnace stack.
What is the difference Ah (in.) in levels of the water in the manometer con-
nected between the base B of the stack and the outside air at point C? Which
side rises? Except for the pressure drop across the furnace (which you need not