#2

a 2. (15 points) Air (Pa = 0.08 lbm/ft?) flows through a furnace where it is burned with fuel to produce a hot gas (Pe=0.05 lbm/ft) 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. What is the difference Ah (in.) in levels of the water in the manometer connected 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 worry about), treat the problem as one in hydrostatics. That is, ignore any frictional effects and kinetic energy changes in the stack. Also, neglect compressibility effects. Gas out A Air Air H= 100 ft Gas Air in B Furnace Water manometer (relative positions of levels not necessarily correct) Fig. P1.13 Furnace stack